My bike is a 03 RM250 and i currently have a 180 jet for motocross/ natural terrain racing and go up to a 200 for Enduro racing out here in Outback Oz.
My bike has a Factory Fatty/shorty system and the G3 Reed Valve.
The best way to find out is to go flat out for a km then pull the clutch and kill the engine, take the plug out and check the colour, a nice brown shade is puuuurfect for my Suzuki.
got a 96 rm250 fmf fatty pipe, boyesen reeds cage and pro series reeds and running 55 pilot 168 main 3rd clip, 40:1 gas with Mobile MX2T, that jetting has been fine from sea level to about 1500 ft above
Need more info on the bike please, pipe, stock, year? Thanks
The best way to start is by the factory settings and go from there. They are usually rich on the main jet so you can go one or two sizes down. Then it also depends on the altitude too. We can help but more info would be beneficial.
Elk
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