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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> clunky gear change
Post Info TOPIC: clunky gear change
Wally Wombat


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Hi all,

One of my bikes seems mysteriously clunky when shifting gear. Cant work it out. Rode my 315 yesterday and it was silky smooth in comparison. 

Can anyone offer any advice? I have changed the oil. Clutch lever seems properly adjusted. Am looking for clues and it seems it is clunkiest when the bike, rather than the engine revs is going faster. eg slowing down from say 60 to a stop the gear change is less clunky if the bike is coasting at a slower speed. Hope i am describing that ok. this bike was nicked and revved to death so maybe something is broken or worn or stuck inside.

cheers

Robin

 

 



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JOHNYBOY


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check chain & sprockets a tight link possible wear on sprockets too tight chain look close you may see something

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TTRfan


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Haha - was going to suggest the exact same thing John and to make sure both front and rear sprockets are on tight and engine mountings not loose.

You have tried the obvious Robin - if my gear change starts to get a bit stiff or clunky, an oil change invariably sorts it out!

Brian



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Moo


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Are the sprockets in good condition and not hooked?

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JOHNYBOY


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if you fit a new chain & sprockets do not lube with wd40 its not for chains it may stop rust lube with 80 gear oil get a half inch paint brush and paint plenty on it may fling but it gets into the pins and rollers best to do when you have ridden it and it stands for a couple of days ready for next ride

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Moo


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Chainsaw oil is cheap and cheerful and made to be anti-fling to stop it flying off chain saws

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TTRfan


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Did you find the cause of the noise Robin?



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Wally Wombat


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Hi Brian, Thanks for asking.

dont think its the chain or sprox.

not only riding that bike, but when i do im looking for clues. It seems to be only when shifting down and i think only into 3rd and 2nd. i try and tease it in but it often clonks in with more force than feels right. another clue: when decelerating down to a stop i sometimes click down a few gears while the clutch is pulled in. sometimes the foot gear change goes loose after dropping one gear, until i release the lever and try again :/

Think its something internal. im picturing the shift cam or part of the shifting mechanism.

Im pretty mechanically sympathetic. wonder if the little darlings that nicked it were smashing it into gear and wore or broke somthing.

prob need to take the side cover off and get in there.

R



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TTRfan


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I am afraid you are going to have to take the clutch cover off and check the gear change pin. If treated roughly these will break the casing and will need TIG welding cry

Gearchange pin.jpg

Repaired gearchange spring retaining pin.jpg



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Wally Wombat


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Hi Chaps, seems like you were right after all! Finally got to changing sprockets and chain. Have run other chains and sprox longer and have seen hookier front sprockets, but the new bits have improved the clunky gear shifting. not quite as silky as bike #1 but def' better. Who'd a thunk it. I do oil the chain after every ride, but it was pretty grotty all the same. So, thanks TTR Forum. I reckon its good enough to enter in the Edinburgh LDT now. -Robin

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TTRfan


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Good to hear it's sorted Robin!

I have only done the MCC Edinburgh Trial once on my trusty TTR and was lucky enough to get a Gold Medal so I have high hopes for you wink

Brian



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