NitroTate Posted February 10, 2005 Report Share Posted February 10, 2005 I ride around 8500' in the colorado mountains, I have 20 cc domes in my coolhead now, drag pipes, ported and polished, dual K&N setup. If I go to 18 cc domes will I still be able to run pump gas or only race. Let me know if more info is needed. Thanks guys Quote Link to comment Share on other sites More sharing options...
dlnoss Posted February 10, 2005 Report Share Posted February 10, 2005 8500', you could probably run 18cc or even 17cc domes with premium pump gas. What compression do you have with the 20's? Is your timing advanced? Quote Link to comment Share on other sites More sharing options...
NitroTate Posted February 11, 2005 Author Report Share Posted February 11, 2005 8500', you could probably run 18cc or even 17cc domes with premium pump gas. What compression do you have with the 20's? Is your timing advanced? 320632[/snapback] No timing advance and I can't remember exactly what my compression was the last time I checked it and I also forgot to check it before I tore the bike apart. I do know that it was actually pretty high compression but I'm convinced I could do better. I am buying a adjustable timing plate so if I do advance, what size would you recommend? I usually use race gas but not alway as it is obviously expensive. Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted February 11, 2005 Report Share Posted February 11, 2005 Start with 4 Quote Link to comment Share on other sites More sharing options...
dlnoss Posted February 14, 2005 Report Share Posted February 14, 2005 18cc should be okay at that elevation but I would check it when you get it back together and make sure it's not too high for pump. Quote Link to comment Share on other sites More sharing options...
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