Yamaha TRX850 Enthusiasts Forum

Well I can finally say this myth is busted on the JE pistons with official confirmation from TTS



JE BIG BORE PISTON KIT

CUSTOM MADE EXCLUSIVELY FOR TTS

YAMAHA TDM/TRX850

878cc 91mm Bore (1.5mm Oversize) 10.5:1 Compression

Machined from 2618 T6 high tensile forged aluminium

Dome/Dish features smooth flowing radii and require no de-burring or preparation

JE designs are specifically engineered for extreme applications including professional competition

Pins, pin fitments, lock and rings included

DELIVERY TIMES MAY VARY DEPENDING ON STOCK - BUT USUALLY 7-28 DAYS FROM DATE OF ORDER

TTS OFFER A BORING AND PLATING SERVICE - PLEASE CALL FOR FURTHER DETAILS

FREE POSTAGE TO UK POST CODES ONLY

CALL FOR AN EXACT INTERNATIONAL SHIPPING RATE

GENERIC PHOTO USED NOT OF ACTUAL PISTON

Had it been an issue Cobba? I knew years back they were only 10.5.

No just a lot of misconception, I and many others on the forum where under the impression they where 11.5:1. A couple of emails to TTS went unanswered on this until I questioned them on their pistons advertised on ebay and photo of a slipper skirt piston on their sales ad.
At least I finally got confirmation from tts and changed their ad so now this can finally put the myth to bed.