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  1. Raptor 660 Modifications
    It won't start so we bumped it and it has alot of lag on the bottom end and it's just not running right its back firing and it doesn't want to Rev up I took the air box lid off and it helped it alot I just want help finding out what's wrong I've messed with the jets and when I went to tune it it...
  2. Raptor 660 Modifications
    I'm thinking of going with a 102mm 10.75 piston from JE. (I'm thinking 10.75 cuz I want to still use 91 octane, and hear that 11.1:1 will be on the boarder almost having to go to 93 since I'm getting a high compression piston) Are they crap or good?
  3. Raptor 660 Modifications
    I'm wanting to go with an 11.1 hi comp piston when i do my big bore 686cc next riding season. Also I will probably be adding a stage 1 cam. I know stage 2 is better but I need to save money somewhere☹️. Can I run 91 octane? That's all we have around here. 02 raptor 660
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