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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> TTR drive train noise issues
Post Info TOPIC: TTR drive train noise issues
jasparach


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TTR drive train noise issues
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Hi all, best wishes for the festive season and a happy new year 

to one and all. I have a question about a ttr that a friend of mine

has and it is this, his bike is seems like it is snatching when

driving slowly and there seems to be a roughness in the drive train

almost as if it is missing and then catching again when driving. The chain

and sprockets are new having being recently put on so they are ok.

Is it possible that it would be an issue with the gearbox of driveshaft

or has anyone heard of the like. It will drive and change gears but there

is a roughness like a grinding from something. Rear wheel bearings are

ok, no play in them. Just said i would the question out there and see if 

anybody else has experience of what i have outlined above.Any feed back would

be appreciated.

Many Thanks

John.



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1996 TTR 250 OE, 1996 YAMAHA WR 200, 1990 YAMAHA FZR 1000,2001 HONDA DEAUVILLE 650, 2005 TTR 250, 1998 Honda CR125R( in pieces) 1994 Kasawaski KX 250.
barra8


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TTR drivetrain issues
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If there is movement side to side then it's most likely the gearbox bearing as Martyn suggested cry

Hope we are wrong & the sprocket is on wrong or loose??

Would be worth checking all sliders & chain rollers to be sure it's not something simple.-not likely by the sounds of the play in the sprocket cry

Merry christmas

....................

Jarrah.



-- Edited by barra8 on Tuesday 25th of December 2012 02:48:54 AM

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Cubber


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Merry festive period to you and yours too, John. biggrin

TTR gearboxes are generaly quite robust. Having said that - your mate reckons his sounds iffy! confuse

Seeing that the chain and sprockets have been changed I presume the gearbox sprocket nut was done up to the correct torque????? If not, and the gearbox sprocket is loose, then that may be your answer. blankstare

Is the chain adjusted to the correct slackness? confuse

Does the snatchiness occur in all gears? confuse

Does the clutch work properly with the cable correctly adjusted and oiled? confuse

How is the engine oil - has it been changed recently because it lubes the gears and clutch too and is known to cause poor gear changes if it's too low or tired???

Tell your mate to give his bike a good looking at, checking everything that moves and adjusting it all correctly. He may be lucky enough to find somethig really basic and easily curable. I hope so. wink

Martyn



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East Budleigh. Devon
jasparach


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Thanks Martyn, as far as the sprockets are concerned, the sprocket nut did come loose
on him of late and also the front sprocket was fitted the wrong way around, collar
facing outward
now as to whether that has caused any issues with the bearing of the driveshaft
i don't know, there is a bit of play in and out in the shaft but not so much from
side to side, the roughness is there in all the gears when driving , it just feels
as if something is not in line or has teeth missing, it is a hard one to diagnose
without going down the extreme and expensive of taking it apart.


















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smithy


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hi, do you know if the problem started after the c+s change, could it be that the chain is to tight



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Cubber


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I'm sorry to say that in my considered opinion it seems to me that the gearbox bearing may well be on its last legs, especially so if the bike is not young. cry

I bet that the nut loosening - together with a miss-aligned chain line - may well have been the straw that broke the camel's back. blankstare

I sincerely hope I'm wrong, but be prepared...........

In the mean time wait till the others give their opinions, sit down, have a drink or two and relax over the festive period, it'll wait. wink

Martyn



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East Budleigh. Devon
TTRfan


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RE: TTR drive train noise issues
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Did your mate find the source of the problem John?

I had a similar problem with what seemed like a noisy chain/transmission but it turned out to be caused by a loose lower rear engine bolt. Very odd as the engine has never been out of the bike - I know that coz I have had it from new confuse

Torqued up the bolt and noise gone wink

Brian



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jasparach


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Hi Brian, we have it narrowed down to the clutch as far as we
can tell, it will be looked at in more detail next week and see whats up, thinking
is that it could be the clutch basket that is doing it. Will know more
next week.

John.

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TTRfan


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jasparach wrote:

Hi Brian, we have it narrowed down to the clutch as far as we
can tell, it will be looked at in more detail next week and see whats up, thinking
is that it could be the clutch basket that is doing it. Will know more
next week.

John.

 Funny you should say that as a mate suggested the clutch basket could be the cause of my noise.

Don't forget to feed back please - we love happy (hopefully!) endings wink

Brian



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jasparach


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Well it's not the clutch so it's looking like a strip down to have a look
in the gearbox, could be a tooth on a gear but it's in the gearbox at any rate,
should be fun!!

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1996 TTR 250 OE, 1996 YAMAHA WR 200, 1990 YAMAHA FZR 1000,2001 HONDA DEAUVILLE 650, 2005 TTR 250, 1998 Honda CR125R( in pieces) 1994 Kasawaski KX 250.
jasparach


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It turned out to be a complete stripdown and replace a shaft
and some gears plus a bearing and rebuild back up, was sent
a motocross mechanic to get sorted as time was against doing it
ourselves as my mate wanted it back as soon as possible so to
have it to use as opposed to it sitting until time was found to do it.
Was done for a cost of around the 300 euro mark including the parts
and is running fine since.

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1996 TTR 250 OE, 1996 YAMAHA WR 200, 1990 YAMAHA FZR 1000,2001 HONDA DEAUVILLE 650, 2005 TTR 250, 1998 Honda CR125R( in pieces) 1994 Kasawaski KX 250.
jasparach


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oh and the valves were reshimmed as well as they were
found to on the limit when it was stripped

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Cubber


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Cor! - pricey but great to know it's sorted finally. wink

Now that you can go out and enjoy yourselves the weather has turned cold and nasty. Better put your thermals on! aww

Martyn



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East Budleigh. Devon
jasparach


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ya the weather is a tad nippy, there are a lot of brass monkeys looking
for a welder!



-- Edited by jasparach on Saturday 30th of March 2013 09:53:38 PM

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TTRfan


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jasparach wrote:

It turned out to be a complete stripdown and replace a shaft and some gears plus a bearing 

Interesting - do you know what exactly what parts were needed please?

Brian



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Marshall


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Im also having a little issue like this, i changed my sprockets and chain. The chain is a little thinker then the old chain and it kinda sounds like its just rubbing on the rubber/plastic chain guard. I got put on a renthal r3 O ringchain, anyone got any suggestions, should i just sand down the chain guard to make room for the thinker chain or just drive and let the chain do it it self. I dont think a steel chain will get hurt from a rubber/plastic chain guard.

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jasparach


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I wasn't talking to the mechanic personally Brian but my mate said
that he replaced two gears and a shaft plus a bearing in the gearbox
I will be talking to the mechanic myself soon as i am dropping an fzr
1000 that i am restoring up to him to balance the carbs on so i will ask him myself
as i would also like to know and i will let you know in due course.
and @Marshall is it the chain guard on the bottom of the sprocket that
it rubs on ?

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1996 TTR 250 OE, 1996 YAMAHA WR 200, 1990 YAMAHA FZR 1000,2001 HONDA DEAUVILLE 650, 2005 TTR 250, 1998 Honda CR125R( in pieces) 1994 Kasawaski KX 250.
Marshall


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Yes I think so.

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jasparach


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Marshall,If you are running a 52 tooth rear sprocket i think the chain does foul
that and somewhere on the forum there is a piece on elongating the
holes in it to lower down so that chain runs more freely through it,
Brian or Martyn would know more on it from what i remember of it
at the time i read it.

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1996 TTR 250 OE, 1996 YAMAHA WR 200, 1990 YAMAHA FZR 1000,2001 HONDA DEAUVILLE 650, 2005 TTR 250, 1998 Honda CR125R( in pieces) 1994 Kasawaski KX 250.
Cubber


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I admit it, it was I. aww

Here's the LINK to my posting titled "New chain & sprockets" Jan-26-2012

It doesn't take much to lower the carrier, but the securing bolts are small and haven't much meat so don't file too much away! no

The posting is about 14 from the end - at least two thirds into the thread. confuse

Martyn



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