I have been messing with my jetting, gearing, and compression a lot in the last month or so, and today was the first day i really got on it. We had about a 400yrd stretch across a bean field. When i would hit 4th 5th and 6th gear it would just loose power. It wouldn't bogg down or anything it just wasnt pulling like i would like. I have stock 13/39 gearing, and running a 38mm carb with 175 main jet on a stock cylinder with a clean up port job, and fmf exhaust. My buddies 400ex would pull on me on top end witch i know it shouldnt. I am thinking i might need to go down to a 36mm carb, or drop the jet to a 170 in the 38mm. Also i might gear down a little and go with 13/41 gearing. Any Advice? I have always rode banshees so maybe im just used to that type of powerband
Tylercaz
Definitely change to 14/38 maybe a 37 or 36. Carb may be alright where it is. Try gearing change first then go from there.
13-39 should be about right for a stock motor.if it's not pulling 5th-6th,going to 14-38-39 is going to hurt you even more.you need to do some jetting..going to a 36mm carb will give you alittle more bottomend.how are your reeds?.you either have a reed,ignition,or jetting problem
My compression is exactly 180. I just lowered it from 210 by putting a thicker head gasket in. I understand going to a 14/39 would hurt me that.s why i was thinking of going to a 13/40 or 41, I looked at the plug after a couple of hard pulls and it is a nice tan color and not wet by any means.
you have either a jetting or pipe-reed-jetting problem..i beat my sons 05 450r with a bone stock "except for a crappy fmf pipe" 86trx.
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