3/8ths impact
Sent from my SM-A135U1 using Tapatalk
Sent from my SM-A135U1 using Tapatalk
Cb450 1974 starter clutch rattle
Hello,
looking for some help, I have just rebuilt the starter clutch on my 74 cb450. It turned over a couple of times and then started rattling in the starter clutch.
I’m a bit concerned I didn’t screw the starter clutch rotor in all the way. I tightened as much as I could with a socket with out forcing it if you know what I mean. I’m a first time mechanic so try not to over tighten things if I can help it.
just wondering ifit needs quite a bit of force to tighten it back in all the way (given that you need the fly wheel puller to take it off).
Any advice appreciated.
looking for some help, I have just rebuilt the starter clutch on my 74 cb450. It turned over a couple of times and then started rattling in the starter clutch.
I’m a bit concerned I didn’t screw the starter clutch rotor in all the way. I tightened as much as I could with a socket with out forcing it if you know what I mean. I’m a first time mechanic so try not to over tighten things if I can help it.
just wondering ifit needs quite a bit of force to tighten it back in all the way (given that you need the fly wheel puller to take it off).
Any advice appreciated.
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I forget the diameter of the bolt. If it is 6mm, then torque should be 6-9 lb-ft; if 8mm, then 18-25 lb-ft. It doesn't need much torque because the rotor is on a tapered shaft and locked in place with a key; the torque on the bolt just holds it against the taper. You need the puller because of the tapered shaft.
Thanks! Have put back together as per above with new caps rollers and springs. Still rattling seems to be mis engaging? I checked the screws on the clutch plate were all ok. It’s quite a bad rattle. Seems to sometimes engage and sound normal and most of the time a loud rattle. Any ideas?
Did you check it out on the crankshaft, without the chain on it, to see if it locked and unlocked correctly? That might show where the noise is, if it's not the chain hitting the castings. Did you make sure the plate that holds the rollers in the channels isn't worn - if it's worn enough, the rollers can turn sideways.
Did you check it out on the crankshaft, without the chain on it, to see if it locked and unlocked correctly? That might show where the noise is, if it's not the chain hitting the castings. Did you make sure the plate that holds the rollers in the channels isn't worn - if it's worn enough, the rollers can turn sideways.
Thanks! I checked on the crank shaft and off and seemed to lock unlock as expected. I didn’t check the plate as it was on nice and tight so didn’t want to remove. But I think based on your comments I will check the plate as it’s the only thing else I can think to check! Chain is a bit loose but seeing that sometimes it doesn’t make it, hopefully it’s the plate.Did you check it out on the crankshaft, without the chain on it, to see if it locked and unlocked correctly? That might show where the noise is, if it's not the chain hitting the castings. Did you make sure the plate that holds the rollers in the channels isn't worn - if it's worn enough, the rollers can turn sideways.
Really appreciate the help! At least I’m getting good at assembling disassembling it!!
I think my 450 does the same thing occasionally...sometimes the electric start functions fine, sometime it doesn't grab and make a horrible sounding clatter until it spins down. Sometimes I try again and it starts, other times I just got for the kick start. It seems to have something to do with the rollers not grabbing the shaft.
Jeremy is also right - I seldom use mine, but when I do, it will occasionally chatter. I put it off to the cylinder hitting TDC and briefly popping the crank forward, making the starter clutch slip.
I think the chain is supposed to be loose, just not enough to bang around against the casting.
I think the chain is supposed to be loose, just not enough to bang around against the casting.
If you replaced the rollers, springs and caps you need to look at the surface the rollers engauge to. It shold be totally smooth..if there are any slight waves or irregularities that will cause the rollers to skip and make a racket. The old story of replace everything if you want it to work.
I once was on a trip with a CB350 and wore the electric starter out to the point it would not start the bike.....No problem just use the kick starter. Then I wore it out so for the 1800 miles home I bump started my loaded down 350 with a windshield on it.
I once was on a trip with a CB350 and wore the electric starter out to the point it would not start the bike.....No problem just use the kick starter. Then I wore it out so for the 1800 miles home I bump started my loaded down 350 with a windshield on it.
Thanks, new clutch plate and knock pin have arrived. Only other item is the starter sprocket which I don't have.
I'm guessing from your comment I may need a replacement starter sprocket? Might be a bit harder to source in NZ but will take a look online.
Meanwhile, I saw a few videos where they tested the electric start with the cover off. Anything I need to check if I do this method? Assume I just leave the kill switch off so that it doesn;t start? I want to see if I can see what is going on?
And yes, the kick start spindle is already toast
I have sourced a NOS spindle, but if anyone knows where to find the right kick start lever let me know!
I'm guessing from your comment I may need a replacement starter sprocket? Might be a bit harder to source in NZ but will take a look online.
Meanwhile, I saw a few videos where they tested the electric start with the cover off. Anything I need to check if I do this method? Assume I just leave the kill switch off so that it doesn;t start? I want to see if I can see what is going on?
And yes, the kick start spindle is already toast
I have sourced a NOS spindle, but if anyone knows where to find the right kick start lever let me know!
Yes, part number 2 in this illistration, https://www.partzilla.com/catalog/honda/motorcycle/1976/cb500t-a-500-twin-dohc/starter-motor
If you have a friend with a lath you might be able to smooth it out but everything has to be concentric. Personally i have spent time with emery paper trying to smooth one out.....let's say it was educational but not successfull..
As far as your kidkstarter, it looks like it goes inside the lower cases? If so and if parts are difficult to come by I have welded the lever to the spindle. Sounds bad but with a MIG welder and a wet rag around the shaft and seal area it can be done. To get it off for clutch service etc just use a angle grinder. I have tried drilling and pining the lever to the shaft and that doesn't work for me.
You live in a great country for motorcycling, time to get out and ride. Or do you guys just race up and down the beach at 200MPH.
If you have a friend with a lath you might be able to smooth it out but everything has to be concentric. Personally i have spent time with emery paper trying to smooth one out.....let's say it was educational but not successfull..
As far as your kidkstarter, it looks like it goes inside the lower cases? If so and if parts are difficult to come by I have welded the lever to the spindle. Sounds bad but with a MIG welder and a wet rag around the shaft and seal area it can be done. To get it off for clutch service etc just use a angle grinder. I have tried drilling and pining the lever to the shaft and that doesn't work for me.
You live in a great country for motorcycling, time to get out and ride. Or do you guys just race up and down the beach at 200MPH.
Installed new clutch plate and inspected the sprocket which looks perfectly smooth, and spinning it on the crank shaft it looks like it is also not misshapen...Still not engaging.
Next step I think I'll try and turn it over with the case off to get a better look. The rollers don't seem to pop out much from within their housing and I wonder if this is the issue?
FYI - I'm using a car battery to turn it over, no chance this is causing an issue?
Next step I think I'll try and turn it over with the case off to get a better look. The rollers don't seem to pop out much from within their housing and I wonder if this is the issue?
FYI - I'm using a car battery to turn it over, no chance this is causing an issue?
The rollers are pretty much always in light contact with the crankshaft, under the small amount of pressure provided through the caps by the roller springs, If not, there is a problem. Just sliding the rollers onto the crankshaft should require rotating it a little to push the rollers up the ramps against the springs.
Only if the car is running.FYI - I'm using a car battery to turn it over, no chance this is causing an issue?
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