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  1. Raptor 250 General
    hi all im currently running my 250 with a big gun evo r full system exhaust, gytr air filter and adaptor plate with a standard air box with lid on , I have gytr jets installed as per the instructions with the jets, (what Yamaha recommend) and the fuel screw out 2 turns and when the engine is...
  2. Raptor 660 General
    I got an 05 660. The silencer in the exhaust was removed by the previous owner. And I have a 10:1 high compression piston. K&n filter also. Elevation is around 100ft or so. It has stock jets right now and mid to high performance is pretty bad( back firing, popping) so what size jets should I get?
  3. Raptor 660 Mods
    I just made some mods to my 2001 raptor 660 engine and I need some advice with jetting. I found a few jetting kits but don't know wich one could fit best. My engine: Wiseco high compression +20mm bore Hot Cam stage 2 cam with springs and retainers Hot Cam kit for stage 2 Ported head with stock...
  4. Raptor 660 Mods
    I recently just got a 2002 RAPTOR 660 and it wasn't in the best condition. i just rebuilt the carbs and when i went to run it, it was running way to much. it has 11:1 wiseco piston bored to 100.5 mm. and i think the jets need adjusted. can anyone help me on what jet settings it should be...
1-4 of 4 Results