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The TTR250 FAQ web pages -> TTR250 -> Sprockets, chains and gearing -> Upper chain roller
Post Info TOPIC: Upper chain roller
Darren


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Upper chain roller on the raid
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Can anyone  tell me the outer diameter and the thickness of the upper chain roller as I have someone who can make me one for free and mine seems to be missing in action.

Cheers Daz



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TTRfan


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The outside diameter is 34mm (or at least the All Balls replacement one is) and the width is about 24mm. I am sure that the original Yamaha part had just one bearing but I see that the All Balls replacement has two.



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Darren


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Cheers Brian. Having one made up as we speak. ;)

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Valkman


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Upper chain roller
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The upper chain roller on my 2005 TTR250 has disintegrated. I have tried to find a parts catalogue so I can identify the part number(s) without success. Can anyone help                   



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TTRfan


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All the part numbers are here

All Balls do a kit but the bolt they supply is the wrong length - roller is OK though and that's the bit that normally needs replacing wink

Brian



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admbnm


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chain roller
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good evening,on my open enduro which i bought a few weeks ago i have noticed that the chain roller is missing,the bracket which i presume was welded to the frame is also awol,i have had a few 4stroke trail bikes and none have had this mechanism fitted,could someone advise as to is this part needed for mainly road and dry unmetalled lanes etc,i would have no problem rewelding a bracket,also a close up pic of the roller fitted seems hard to find and some pics seem to show a bare metal cover plate on both sides of the frame in this area,should mine have this?.i'm really enjoying the bike and the small prob's i've had are not putting me off at all,all the best,martin



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Cubber


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Martin, this diagram illustrates the chain roller

Image6.jpg

and also the part numbers for the various bits.

The roller itself is available HERE

Martyn



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peteBLUEttr


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DSCF7399.JPG

The plates are frame protectors, not essential, an aftermarket part. The chain roller protects against the chain damaging the frame etc under extreme suspension load up

Buy one from here if you like... http://my-eshop.info/epages/699105d9-e4cc-4b32-b236-84e72cd67f84.sf/en_GB/?ObjectPath=/Shops/699105d9-e4cc-4b32-b236-84e72cd67f84/Products/TTR-0072



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admbnm


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thanks martyn,pete.just the info i was after.

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Moo


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Missing chain roller
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Are these vital? Where I think the chain roller should be... there just seems to be a stub of snapped off bracket.. so no option now of running one. Any disastrous effects?

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Keith89


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I don't have the top one as the rubber fell off the bearing.

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TTRfan


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Mr Yamaha's bean counters tend not to let the designers put anything on a bike that isn't useful.

The upper chain roller is even more important if you have lowered your TTR - or are a heavy lump like me disbelief

The fact that yours has been broken off indicates some heavy chain/roller contact!

Brian



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Moo


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Oooo err.. Worrying. It does have a lowered linkage, but i have the original i need to put back on, because i am no midget... I'm not into jumps, but i dont really have the option to put one back on, as the lug is missing off the frame, and i'm no welder :(

Along the same lines, whats the recommended chain slack? The manual says 35-50mm so i've adjusted for about that, but it seems a bit hard to judge, as if i pull the chain up 50mm is hits the chain slider.

Replaced the chain yesterday (courtesy on Mr TTRfan) for a renthal, as the chain on it was slacker than a slack thing... could virtually pull it off the back! And could be heard slapping about. Also found it was a non-oring chain when i broke it apart.

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TTRfan


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The fixing lug for the chain roller is basically just a bit of tube. 

I think you will find you need to adjust the chain on the tighter side of the spec. when a lowering link is fitted.

Brian

PS My girlfriend thinks that I'm a stalker.  Well, she's not exactly my girlfriend yet. biggrinbiggrin



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Benttr1423


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RE: chain roller
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hey mate I have just bought chain rollers for my bike and their is 2 they are both different sizes but a cant work out where the second one would go??

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peteBLUEttr


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You sure they are for TTR?

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petenz


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The rollor is to stop the chain becoming overly lose under full
suspension compression... the chain raps around it to take
up lose chain... why alot of bikes lose them full compression
& a lot of throttle gives the hell as the drive force is directly
on them...

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peteBLUEttr


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Dunno why you got a second different sized one though...

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Moo


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Re-welding Chain Roller
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So my TTR is missing the chain roller bracket and at somepoint i'd like to get it re-made.

Firstly, does anyone have the dimensions of the steel tube? diameters and its length, i'll try and find some suitable replacement.

Also, a long ask.. But does anyone near Kettering/Northamptonshire know of a decent engineering company who could re-make it?

 

Regards, Moo.



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mossproof


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Well it's an 8mm diameter bolt, so internal diameter of the tube needs to be 8mm. At least 1mm wall thickness I would suggest making 10mm o/d minimum. More for strength but it doesn't want to be too ugly. It just needs to be of a length that places the roller centrally over the chain. Probably 25 - 28mm long with the outer end more or less flush with the face of the mounting web. Anyone with a decent welder and an eye for detail could manage it, but I don't know anyone in your area I'm afraid.
Good luck,
Simon.

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TTRfan


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Maybe Steve has a scrap frame that he could cut the roller tube section off for you to use?

Brian



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ttr steve


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Yes I do. I also have a white rear mudguard.

Please send me a pm



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JOHNYBOY


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chain top roller
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should my ttr250 oe have a chain upper roller if so where does it fit any pics please many thanks john



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devon_rich


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20171019_230318.jpgThis one?



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TTRfan


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Yep - you should have a roller else you may find the chain starting to eat the frame cry

Roller here

Genuine Yamaha bolt & nut here

Brian

PS Three more posts and you will be elevated to the rank of Guru John biggrin

PPS Another view of the frame bracket to which it fits. My roller escaped and left just the bolt behind disbelief

Chain roller missing.jpg

 



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ttboof


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a bit off topic but if anyone finds the bearing in the chain roller is getting noisy or seized , a skate board bearing is an exact fit ( got a bit of payback on my son  for using the ttr all the time now his skate board is wonky ) 



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JOHNYBOY


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many thanks guys i thought it should have one will have to look closer for eyelet for bolt

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DANKWHEELIE420


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YEA BUT I TOOK MINE OFF JUST KEEP UR CHAIN LUBED AND TIGHT AND SHE WILL B GOOD DO NOT OVERTIGHTEN IT IVE DONE
ALOT OF WEIGHT REDUCTION TO THIS BIKE AND GOT RID OF ALL THE USELESS BITS AND MADE A **** TONNE MORE
POWER WITH ABOUT 5-6 LBS OF WEIGHT SHED.

IVE ALSO CUT THE EXESS OFF THE CARB LINES THAT VENT TO THE TOP OF THE AIRBOX & SNORKEL AND DELETED THE SNORKEL AND DELETED THE SMOG DEVICE AND PUT A STRAIGHT ROUTE TO THE AIRBOX KEEPING THE AIRBOX CLEANED AFTER EACH RIDE AND THE BOTTOM OF THE AIRBOX HAS A DRAIN WITH A ONE WAY VALVE AT THE END ALL SORTS OF MODS CAN BE DONE TO THIS BIKE TO MAKE MORE POWER AND GET RID OF THE BULLCRAP ON THE TOP OF THE INTAKE RUNNER INTO THE CARB AND STUFF A CORK
THAT GAINT ****ING VACCUM LEAK MADE BY YAMAHA AND BORE AND JET THE CARB AND 4 MORE HMU CUZ PEOPLE DONT LIKE WHAT I DO ALL I DO IS I.R.P INSANE,RELIABLE,POWERFUL IM TALKING TO MYSELF OF NITROUS INJECTION INSTEAD OF METHONOL I MAY HAVE TO GET SOMEONR TO MACHINE ME SOME INTAKE PARTS AND MACINE THE HEAD MORE AND REBUILD IT B4 ANYTHING!!!!



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Rydasc6102


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Chain roller
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I was cleaning and inspecting my bike and I noticed that the chain roller was very high (see pictures). I don't know I didn't notice this till now. I think that it goes in the hole below the one it is in. am I correct. 



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TTRfan


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RE: Upper chain roller
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Photo showing correct position here



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