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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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.
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
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
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
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?
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.
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...
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.
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 )
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!!!!
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.