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Cb100 stalls when put into first gear with clutch still in


Alex1cmaster
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Hey there. My 1970s Honda CB100n stalls when I put it into first gear even with the clutch firmly held in.

I've tried adjusting the clutch cable and it's not the side stand safety switch.


Could this be a stuck clutch? If so what's the best way to go about fixing this?


It's worth mentioning that it's been sitting for about a year and everything else is working fine


Thanks peeps! I'll look forward to a reply

Edited by Alex1cmaster
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cb100n has no side stand or side stand switch if it is still original so it cant be that if the bike is lurching forward and stalling as you put it into 1st gear and the bike has been stored for a long time then it could well be the clutch plates have stuck together,first make sure the adjustment is correct down at the clutch case where the cable connects to the arm that operates the clutch not just at the lever,if it is then let the bike run for a fair while without trying to ride it to warm all the oil up and get some heat into the clutch plates then turn it off take it off the stand put it into 1st gear pull lever in and try just rocking the bike to see if the clutch releases if it doesnt then you might have to drop the clutch case off and pull the plates out to separate them and clean them up

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cb100n has no side stand or side stand switch if it is still original so it cant be that if the bike is lurching forward and stalling as you put it into 1st gear and the bike has been stored for a long time then it could well be the clutch plates have stuck together,first make sure the adjustment is correct down at the clutch case where the cable connects to the arm that operates the clutch not just at the lever,if it is then let the bike run for a fair while without trying to ride it to warm all the oil up and get some heat into the clutch plates then turn it off take it off the stand put it into 1st gear pull lever in and try just rocking the bike to see if the clutch releases if it doesnt then you might have to drop the clutch case off and pull the plates out to separate them and clean them up

 

I'll give this a go now. If i have no success with it be hard getting into the clutch casing? I'm worried about old gaskets/fastenings

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check clutch adjustment to start with


has the bike been sat for a long time?

 

Yeah it's been sat for about a year. I have given all clutch adjustments a go with no success

 

my next reply would have been what eastanglianbiker had posted :thumb:

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clutch case removal is a piece of cake just need to either lay the bike over on the left hand side or drain the oil out of it always replace the gasket with a new one and you wont have a problem all the bolts will either be 10mm or 8mm heads i can remembr now its been so many years since i have worked on one and the clutch pressure bolts will be 10mm

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i let the bike run really hot and then tried rocking the bike back and forth in 1st and 2nd gear. You can kinda forcefully move the bike and it clunks forward, but it didn't seem to free anything up.


I then tried rolling it down a hill and clunking it into gear. Only then does it run in first gear but you can't stop because the clutch won't work


Do you think the only option now is getting inside the clutch case?


Once I've drained the oil and I'm inside what is it i'm trying to do?

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I had a bike do this once and my method was to get it running and hold it on the brakes with the clutch held it and give it some revs to stop it stalling


it freed the clutch up and was fine for many thousands of miles!


not the best option to try though :lol:


opening the clutch is easy I would get it open myself

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I've now taken the clutch casing off and I'm inside. It won't be able to go back on until the new Gasket arrives. Anyone got any advice now I'm inside? Is it worth taking out the clutch plates and giving them a service?

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