MyNameIsMud Posted June 3, 2012 Report Posted June 3, 2012 Im looking at buying a head in the next few weeks and am trolling for any and all info i can find.So far from searching here and comparing my mods to others i need 21cc domes at 700ft elevation with T5's,chariot reeds,and k&n with +3 timing.But ive not seen much on having to rejet. Right now my bikes perfectly jetted and running like a scalded dog will bolting on a head change my jetting needs? Also at 700ft can i or should i run smaller domes? Id like to be able to use the fuel we have local here which is 89 but i can travel 20 miles for 93. Quote
Nightmare Posted June 3, 2012 Report Posted June 3, 2012 No need to rejet for a cool head. Chariot, noss, pro design are some good options. Quote
Jereme6655 Posted June 3, 2012 Report Posted June 3, 2012 What is your compression at? Normally you do not need to rejet with just the addition of a head/smaller domes......however it can/will change your compression and fuel requirements. To be honest....I wouldn't think of running anything over stock compression on anything less than 93 Quote
MyNameIsMud Posted June 3, 2012 Author Report Posted June 3, 2012 Compression is 125psi in each cylinder i run anywhere from 89-93 in it now. From what i gather on here 21cc domes give around 30psi more of compression will i need to run on 93 at 155psi? Quote
Jereme6655 Posted June 4, 2012 Report Posted June 4, 2012 Compression is 125psi in each cylinder i run anywhere from 89-93 in it now. From what i gather on here 21cc domes give around 30psi more of compression will i need to run on 93 at 155psi? Very much so yes. You will definitely need to be using 93 t that point Quote
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