1987 TRX250R Jetting Question - ATVConnection.com ATV Enthusiast Community

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Old 02-07-2007, 08:32 PM
Weekend Warrior
Thread Starter
Join Date: Feb 2007
Posts: 1
Default 1987 TRX250R Jetting Question

Hello Everybody:

I am new to making repairs to Hondas, I need your help on trying to find a starting point for my jetting. I'm getting my 250R bored out alittle, my old piston and rings took a turn for the worst. Doing this project before going to Glamis.

The only place I go riding is at Glamis (Imperial Sand Dunes) and the following is what I have on my bike.

FmF SST gold series exhaust
stock carb
will have a new piston at 67.5
boyseen power reeds

If I need to post more information please let me know. PLease help me on a starting point for my jetting.

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Old 02-08-2007, 01:33 AM
Pro Rider
Join Date: Nov 2006
Posts: 469
Default 1987 TRX250R Jetting Question

I dont know what size to start at but I always like to start with a jet that is likely to big then go down on jet size.You dont want to lean it out with to small of a jet.If all you have done is bored it out and put in new piston in it then I wouldnt go up on jetting to much.If you have rebuilt it,put your pipe on and put your reeds in then yeah I would go up several sizes.I guess what I am saying is that just boring it isnt going to change it much.Wish I could give you some numbers.
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Old 02-09-2007, 09:44 PM
Pro Rider
Join Date: Dec 2004
Posts: 334
Default 1987 TRX250R Jetting Question

What kind of air filter setup?. i running pretty simialr to you. i think I have a 150main, but will check tomorrow for sure
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