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Discussion Starter #1
All you 500 guys I've had a lot of questions and calls about the 640 kits. I figured I'll document the one we are building for a local race. Starting on her today so pics will follow. Griffin Performance
 

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Nice
 

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yeah i bet this will be a sweet build
 

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Discussion Starter #5 (Edited)
Started with a 2009 500XT 27" Mega Mayhems on 14" wheels
Motor received:
640 Griffin Performance Big Bore 12:1 compression
Stock 800R cams
Didnt go crazy with cams. Just wanted everyone to see what it does.
 

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Any clutch work? and was this high or low gear?
 

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Discussion Starter #10
Looks like the 640 will get her first look at competition in the mud races this weekend. The 700cc and under class is where she will be competing. Hoping to get you guys some good videos.
 

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Ok cool. So 900n straight up? If I sent my jugs, do you work them or just send out ones you have ready? Just thinking about turn around time
 

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Discussion Starter #16
Ok cool. So 900n straight up? If I sent my jugs, do you work them or just send out ones you have ready? Just thinking about turn around time
I have them here ready to go :th_smiliewoo:
 

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Discussion Starter #18 (Edited)
Dyno results are in:
Stock 500 with full muzzy did 41.3hp
640bbk, R cams, HMF slip-on 62.6hp at the wheels. (Limited by rpms)
Granted these numbers look awesome but it coulda been the dyno. Either way it's a 21hp gain back to back runs. DYNO SHEET HERE
 
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