HELP...chain and sprocket suggestions (300ex) 90

[trax28to]

I got a 300ex axle on my sons 90trx, atv four play set up..What sprocket and chain combos do you all run? stock front with what rear or what? thanks

[scanno]

Call rebel gears they will build you a taller rear sprocket for a 300ex, I run a stock 13 tooth front and a 48 tooth rear, with a koq/400ex setup

[miniquaddad90]

your stock rear sprocket will work, you just need to taper the holes for use with the 300ex tapered bolts. EZ to do, take one of the bolts to a local machine shop supply house, the cutter will be less than a Rebal sprocket!

[miniquaddad90]

14/48 or 13/48 seems to work well. We ran 14/48 and 15/48 all last year but will need LOTS of motor to pull the 15 front.....

[jweidner]

Hey guys,


We ran a trx 90 last year district 6 PA STATES hare scrambles and ran a 15/48. I installed a 125cc big bore kit though. With a stock cylinder head and bore I would try one tooth bigger in front. You just want to make sure its revs out. Pick your longest straight away one the track and gear it for that. I would glad to help with anything else. We ran a trx last year, raced 7 times and won 6.
I spent quite a bit of R&D time to get the trx 90 to be fast and reliable.

One tooth in front equals three teeth in the back.

Thanks,
Precision motor worx
Tuski youth #99