1972 CB450 K5 Hot Mess

Working on setting the valves and have a question about clearence. The FSM calls for 0.03 mm or 0.0012 inch. I believe have seen somewhere that this is to tight and should be a bit looser.Just wondering what more experienced folks say?
The statement that it is too tight is not true, but that size feeler is difficult to find and so this it's hard to properly use. BTW, you are measuring them between the follower and the cam lobe, right? Not between the tip of the follower and the valve stem.

As Brad mentioned, .002" is fine for a stock 450.
 
Thanks everyone for the input. I do have a 0.0015 inch feeler gauge on my very old barely legible set. I believe I will set at 0.002 inch and then as @jensen suggested reset to 0.0015 after I re-torque the head.
 
Rob, not to be critical but I agree with AD that your circlip does seem a bit open. For comparison, here is a shot of mine with a Honda OEM circlip. Maybe the groove on your shaft has some damage from the thrown chain.
View attachment 36391

Finally got the new clips I ordered from Partzilla (not their fault, order lost in the mail and they resent right away once I notified them) and I did get new Honda clips in Honda packaging. Here is a picture of the two clips, the one from DSS on the left and the one from Partzilla on the right. There is quite a difference. Too be fair I believe the clip from DSS was seating properly and would have worked just fine, but the new does seem to fit in the groove better. The part number from Partzilla is 94510-12000 vs 90603-200-000.

IMG_4653.JPG

Here is a pic of the new clip on the spindle.



IMG_4655.JPG
 
To be honest, the clip on the left also looks like it was over-expanded too, not sure if that's the way you received it.
 
To be honest, the clip on the left also looks like it was over-expanded too, not sure if that's the way you received it.
The clip on the left has been installed on the spindle but it was only expanded just enough to slip on and off the spindle. It actually fit tighter in the groove than the one I just installed taking more pressure to spin it. I think it is an aftermarket clip not quite made to the same specs as the Honda clip.
 
The clip on the left has been installed on the spindle but it was only expanded just enough to slip on and off the spindle. It actually fit tighter in the groove than the one I just installed taking more pressure to spin it. I think it is an aftermarket clip not quite made to the same specs as the Honda clip.
Yeah, I couldn't imagine you being the one who stretched it, you're too meticulous for that. Just seems strange they would have sold it to you like that.
 
Yeah, I couldn't imagine you being the one who stretched it, you're too meticulous for that. Just seems strange they would have sold it to you like that.
I have to say it is about the only thing from DSS that I have been disappointed in other than the fork boots for the S90. I bought the aftermarket ones and one of them has torn after less than 2 years and I not even rode it that much. I have a new set of Honda boots and need to get them swapped before the cold sets in.
 
Got another question, what is the correct orientation for the marks on the ends of the cam follower shafts? I believe I have seen that they need to face in towards the spark plugs. While trying to get the technique down to adjust the valves I remembered seeing about this. I believe the marks are supposed to be facing towards the spark plug. I have looked in the FSM but must be missing it. When I assembled the head I placed the follower shafts so I had the most room to do the assembly but they have all been moved now. As always thanks for the help in doing this right.

Here is the mark I mean.

IMG_4658.JPG

The tip of the shaft on the left intake is so banged up I had to use a jewelers loupe to see it but it is facing towards the spark plug now.

IMG_4660.JPG
 
^^^The search function works pretty well on here. I just did a search for "cam follower", enclosed in quotation marks, and got this response. The quotation marks force the search function to look for both words together, instead of returning all hits for the individual words, cam and follower.
 
^^^The search function works pretty well on here. I just did a search for "cam follower", enclosed in quotation marks, and got this response. The quotation marks force the search function to look for both words together, instead of returning all hits for the individual words, cam and follower.
Thank you for the search assist and thanks to @12ozPBR for correcting my dyslectic memory because I remembered totally backwards. I will correct the alignment and reset the valves. I need the practice anyway to getting the gap to stay at setting when tightening the lock nut.
 
Thank you for the search assist and thanks to @12ozPBR for correcting my dyslectic memory because I remembered totally backwards. I will correct the alignment and reset the valves. I need the practice anyway to getting the gap to stay at setting when tightening the lock nut.
If I hadn't been out filling my second 5 gallon gas can and my truck for this Thursday's potentially-impending hurricane I would have answered you within a minute. Yes, always outward away from the plugs, and here's the reason visually.


valve adj indexing.jpg
 
Thank you for the search assist and thanks to @12ozPBR for correcting my dyslectic memory because I remembered totally backwards. I will correct the alignment and reset the valves. I need the practice anyway to getting the gap to stay at setting when tightening the lock nut.
A T-Handle flathead helps to keep that inner adjuster from turning as you snug the nut down - that's the only way I could keep it from spinning a bit and either opening up or clamping down.
 
If I hadn't been out filling my second 5 gallon gas can and my truck for this Thursday's potentially-impending hurricane I would have answered you within a minute. Yes, always outward away from the plugs, and here's the reason visually.


View attachment 37353
Yikes that's right you guys have another unwelcome guest coming you way. Hope she passes by without to much drama. Thanks for the visual and a picture is worth a thousand words.
 
A T-Handle flathead helps to keep that inner adjuster from turning as you snug the nut down - that's the only way I could keep it from spinning a bit and either opening up or clamping down.
I actually did try that but I need to get some better quality bits. The only flat head bit I had that was close to the right size broke when I was using it to hold shaft in place and tighten the nut. I really wasn't putting that much force on it just cheap bit out of a cheap kit.
 
Here's a couple of photos of the carbs I have that you might be interested in. If you need more info, just send me a PM.

Bob

View attachment 37354

View attachment 37355
Thank you for letting me know these are available but with a big thank you, @EzPete sent me a right hand 723A to match the left hand one I have, Of course they need to be cleaned disassembled and then put back together. Excuse the ignorance but what year model did the 723Bs come off of?
 
Feel like I have the valves adjusted as well as I can. Loosened up all the valves and reoriented the cam follower shafts and then reset the valves. Got all of them where a 0.0015 feeler gauge feels a bit loose and a 0.002 gauge will not slip in the gap after tightening lock nuts. Of course after asking the question I found the figure in the FSM showing the correct orientation of the cam follower shafts.

Fig3_25b.jpg
 
Putting the finishing touches to the engine while it is still on the bench before moving it so I can start on the chassis. Routed the alternator cable behind the neutral safety switch and hooked its wire up. I need to go through my boxes of parts and see if I can find the clamp that holds the cable to the back of the engine.

I then started taking a look at the points plate and advance unit. I have both the CB450 set and the CL450 donor set which was stuck on the cam and took a lot of heat and work to get loose. I also disassembled it see it it has any damage. The CB450 set is the one I am planning on using and appears to have been disassembled, cleaned and reassembled by the PO although I decided to disassemble it just to make sure everything was put together properly. Here is a pic of both advance units. CB on the left which if you notice does not appear to have one of the alignment marks but is barely visible using my jewelers loupe and of course lines up with with the cam pin.

CB450 advance unit on the left.

IMG_4664.JPG

I took the CB450 unit apart and what I found confirms what most everyone knows, "Don't trust the PO". It was quite clean for considering it had been siting since the mid 80's but going by @Jays100 thread, "Ignition Advancer Rebuild Information, all 450/500T Models", it had a couple of problems I think. First the the 2 washers/shims that go on the weight pivot pins were both under the e clip instead of one top and the other bottom of the weight. I also found that it only had one shim under the cam where the on the CL450 unit it had 2.

IMG_4665.JPG


This begs the question should there be 2 shims under the cam or can it be 1 or 2 depending on the unit? I saw that a unit @stl360+450 had posted a picture of had 2 shims as well. Thanks for any feed back on this question..
 
Putting the finishing touches to the engine while it is still on the bench before moving it so I can start on the chassis. Routed the alternator cable behind the neutral safety switch and hooked its wire up. I need to go through my boxes of parts and see if I can find the clamp that holds the cable to the back of the engine.
If you can't find yours, I probably have one from one of my spare bottom ends. Let me know if you need it.
This begs the question should there be 2 shims under the cam or can it be 1 or 2 depending on the unit? I saw that a unit @stl360+450 had posted a picture of had 2 shims as well. Thanks for any feed back on this question..
I think end play once assembled and installed on the camshaft with the retaining bolt and hardened washer is what determines if you need one or more shims under the points cam. Excess end play causes erratic advancing and has caused rideability issues on some bikes here.
 
To your question, the fly weight pivot pins need a single shim above and below the weight. Restated, only one shim directly under the E-clip.

Use a thin hi-temp grease, or oil. And just a note on if you use oil on the various pivots, maintenance interval is simply shorter than if grease is used.
 
If you can't find yours, I probably have one from one of my spare bottom ends. Let me know if you need it.
Thank you, I am not sure I ever had one and was intending to cobble one up. If I can't find one I will reach out but if you don't have one handy no worries.

I think end play once assembled and installed on the camshaft with the retaining bolt and hardened washer is what determines if you need one or more shims under the points cam. Excess end play causes erratic advancing and has caused rideability issues on some bikes here.
That makes sense. I will clean, lube and reassemble it with just the one shim and the install it on the cam and then see how much end play it has. I wish Honda did have some tech data about rebuilding the advance units but with different manufactures making them I suppose was easier jut to say replace them
 
Thank you, I am not sure I ever had one and was intending to cobble one up. If I can't find one I will reach out but if you don't have one handy no worries.
I'm pretty sure I do have one, I remember seeing it along the way and knowing I wouldn't need it for the one remaining engine to be built going into a bike that won't even use an alternator. So let me know if you can't find yours, and I'll check.
 
To your question, the fly weight pivot pins need a single shim above and below the weight. Restated, only one shim directly under the E-clip.

Use a thin hi-temp grease, or oil. And just a note on if you use oil on the various pivots, maintenance interval is simply shorter than if grease is used.
Thanks for the reply and for the thread. I am thinking the 2 copper color washers will go on the bottom and the steel ones on top. You mentioned wavy washers go on top in the thread but these all look flat to me but I will take another look before assembly. I think I will just use oil to lubricate the unit so I don't have to worry about the grease hardening up.
 
I temp installed the advance unit that I am planning on using which has one shim and found that the end play was about 13 thousandths of an inch while the other unit which has 2 shims (a 0.010 and a 0.005) had about 7 thousandths end play. I took the 0.005 shim and added it to the other advance unit and reduced the end play to about 7 thousandths.

In the course of doing all this my old E-Clips are all stretched and I need replacements. I saw @Amannl's thread CB450 auto advance e-clips, https://www.vintagehondatwins.com/forums/index.php?threads/cb450-auto-advance-e-clips.10793/ and wondered if you did get the 4 MM clips from McMaster Carr and if so did they work for you? I found some 4 MM Honda clips online, P/N 94540-04018 and stopped by the Honda automotive dealership to order some but was told they were back order and not available at the moment. I tried some 5/32 e clips from Lowes but they seemed to small and did not fit properly. If anyone has a good part number or source for clips work well I would appreciate hearing from you.

Here is a photo showing the OEM e clip on the left and the Lowes clip on the right. Notice the difference in the way they are made.

E-Clips.JPG
 
I temp installed the advance unit that I am planning on using which has one shim and found that the end play was about 13 thousandths of an inch while the other unit which has 2 shims (a 0.010 and a 0.005) had about 7 thousandths end play. I took the 0.005 shim and added it to the other advance unit and reduced the end play to about 7 thousandths.

In the course of doing all this my old E-Clips are all stretched and I need replacements. I saw @Amannl's thread CB450 auto advance e-clips, https://www.vintagehondatwins.com/forums/index.php?threads/cb450-auto-advance-e-clips.10793/ and wondered if you did get the 4 MM clips from McMaster Carr and if so did they work for you? I found some 4 MM Honda clips online, P/N 94540-04018 and stopped by the Honda automotive dealership to order some but was told they were back order and not available at the moment. I tried some 5/32 e clips from Lowes but they seemed to small and did not fit properly. If anyone has a good part number or source for clips work well I would appreciate hearing from you.

Here is a photo showing the OEM e clip on the left and the Lowes clip on the right. Notice the difference in the way they are made.

View attachment 37429
I did order from McMaster and they did work perfectly. I only used 2 so there are a lot left over so If you pm me your address I’ll put a few in an envelope for you tomorrow. I just have to remember where I put them all🤔
 
I was amazed you got the e-clip off without firing it across the shop. I don't think I've every re-used a circlip or the likes, the old ones are all behind the workbench.
 
I did order from McMaster and they did work perfectly. I only used 2 so there are a lot left over so If you pm me your address I’ll put a few in an envelope for you tomorrow. I just have to remember where I put them all🤔
I know it costs more, but if you just put them in a plain envelope they might get caught in the mail sorting mechanism and get ripped out of the envelope, leaving an empty envelope to be delivered. It's happened before with small, reasonably thin stuff.
 
Yep, a guy once searched a long time for two tiny machine screws to hold a gage face in place. I disassembled an old gage I had and mailed the screws to him in a normal business envelope. He got the envelope with two tiny holes in it and no screws. A complete waste of time!
 
Yep, a guy once searched a long time for two tiny machine screws to hold a gage face in place. I disassembled an old gage I had and mailed the screws to him in a normal business envelope. He got the envelope with two tiny holes in it and no screws. A complete waste of time!
Exactly the story I was trying to recall!
 
I did order from McMaster and they did work perfectly. I only used 2 so there are a lot left over so If you pm me your address I’ll put a few in an envelope for you tomorrow. I just have to remember where I put them all🤔
Thank you!
 
I was amazed you got the e-clip off without firing it across the shop. I don't think I've every re-used a circlip or the likes, the old ones are all behind the workbench.
I think the reason I got them off without them flying everywhere is that after the hot and cold cycles when the engine was running and then after sitting 50 years they pretty much lost their temper. The part that scared me is the alignment pin that goes in the shaft on the exhaust cam. When I was checking end play the little rascal slipped out of my fingers, hit the bench and bounced. I swear i watched it go on the garage floor under my pickup. I crawled around on the concrete for about 10 minutes and then finally got up to get off my knees and happened to glance back towards the engine and there was the pin right next to the engine still on the bench. Laugh and curse. :rolleyes:
 
OK. Stupid question. I have a 450CL and have read, and a mechanic confirmed, that I am to perform "starter clutch maintenance". What does that mean?
Do you have a copy of the Factory Service Manual (FSM) and a copy of the parts manual? You can PM an admin and they will give you a download link. Most of what I was talking about in this thread was about rebuilding the starter motor. The starter clutch is attached behind the alternator rotor and has some small springs and roller bearings that need to be replaced and they are available from different vendors. Here is a link to a video that goes through the process and there are others on YouTube. BTW I only use the videos to help me see how parts are put together and be wary of how they do the work as they can sometimes do a lot of damage.

 
Last edited:
Got the the e-clips for the auto advancer and after double checking that the cam was installed correctly I put it together and installed on the exhaust cam. I feel better knowing that the alignment pin is not going anywhere now. I had dressed up the contacts on the points that were in the bike as they looked 100%. I will change them if I see any issues or think the springs have gotten weak. Installed the base plate assembly and I think I have the wires connected properly but would appreciate if others took a look to confirm. I am planning on setting the gap and time it with a multimeter just so it is in the ball park.

IMG_4675.JPG
 
Terminals are oriented correctly to avoid improper contact, looks good. I usually start with the plate a tick further advanced (the left side of the left-hand notch in the plate aligned with the left side of the cutout in the cam bearing) but it's plenty close for a starting point on static timing adjustment. You needn't worry about points springs, it's very rare to see any diminished in strength with age.
 
The only thing I can see is that the gasket surface for the cover is pretty beat up along the bottom. If you can smooth it out a bit it would help avoid leaks.
 
The only thing I can see is that the gasket surface for the cover is pretty beat up along the bottom. If you can smooth it out a bit it would help avoid leaks.
But it shouldn't have any leaks there anyway, the seal behind the points rarely leaks and the rest of the cover area is dry. It only has a gasket to keep water out of the points, of course. But it could use a flat file for a minute, for sure.
 
But it shouldn't have any leaks there anyway, the seal behind the points rarely leaks and the rest of the cover area is dry. It only has a gasket to keep water out of the points, of course. But it could use a flat file for a minute, for sure.
Oops! Just my programmed reaction to a banged up gasket surface.
 
Thanks for taking a look and confirming the wires are connected correctly. Also I will smooth out the gasket surface. It’s amazing how many more imperfections you see in photos. :D
I blame the phones today. Cameras are too good.
 
I concur. What my aging eyes see and what the camera sees are definitely 2 different things :ROFLMAO:
I think this is the real issue. I've learned to take a photo of something I'm having trouble reading, as well as of something I'm working on that seems to be giving me a hard time.
 
I think this is the real issue. I've learned to take a photo of something I'm having trouble reading, as well as of something I'm working on that seems to be giving me a hard time.
I do it all the time, if things are hard to read then you can always zoom in on a picture. (the warrior uses the weapons at hand. LOL)
 
Got an assist from a friend and got the engine off the bench and securely strapped on a dolly which I rolled out of the way in the garage. Cleaned the bench up a bit and decided to start on the carburetors which are an interesting mix. I have two left 723A's, one from the bike and the other from donor engine parts. The right carb off the bike is a 14H which is not good because I am told it came off an earlier model and you shouldn't mix and match as they will not tune properly. I also have a left right 723A carb body thanks to the generosity of @EzPete so hopefully I will be able to salvage all the bits and pieces I need from the extra extra 723a and the 14H.

I started disassembling the donor 723A to get the brass, float and such I will need for the donated carb body. I used Kroil on all the fasteners and jets the night before disassembly and it did seem to help stuff to come apart easily. Jets are 38 and 145.

IMG_4688.JPG

Another thing I will need is the choke shaft and butterfly from the 14H which I hope will fit the 723A but the brass cap which I believe holds the felt washer on the choke that is missing so I need to get one off one of the other carburetors.

I have question, how do you get the caps off without destroying them?

This is the cap off the 14H obviously been customized by a PO or the Go_Ape Motorcycle repair shop.

IMG_4682-2.JPG


Here is a photo of one of the caps I am trying to get off the extra 723A.

IMG_4692.JPG
Are the caps and felt washers available for sale or do they have to be made by hand?
 
The choke linkage and springs etc fits - I think the only difference between the 14H and the 723’s is the air mixture screw and the jets. I forgot I pulled that one off. I used pliers and a piece of old innertube to protect it from scratching a little bit of heat and oil before hand and it popped right off. You just have to be careful as it comes off so you don’t bend it closed and just press fit it back on the other one.
 
Back
Top Bottom