01bansheefox Posted January 6, 2004 Report Posted January 6, 2004 When i get new heads I was told at the yamaha shop I should get 17cc domes. Im at sea level maybe a few hundred above "not much" SST's- K&N- jetted. Quote
Wallrat Posted January 6, 2004 Report Posted January 6, 2004 So what's your question? Can it be done? Sure if you don't mind running race gas. You'll have detonation problems with pump gas and 17cc domes. Quote
dlnoss Posted January 6, 2004 Report Posted January 6, 2004 17cc domes are REAL small for sea level, a stock crank, and anything but race gas. Are you ported? The Yamaha shop may want to do a total rebuild for you. Quote
01bansheefox Posted January 6, 2004 Author Report Posted January 6, 2004 Im kinda asking is 17cc right? Thought i read before with something that low you need stronger crank and some other stuff for my engine? But they know my engine is stock except for what i listed. It is not ported. Quote
bri98 Posted January 6, 2004 Report Posted January 6, 2004 Race Fuel will be a MUST if you go with th 17cc domes, and welding the crank is never a bad idea especially with high compression. I run 16cc domes at 600 above sea level. For fuel I run Sunoco 110 octane I could probably get away with 104. Quote
Dragg-on Posted January 7, 2004 Report Posted January 7, 2004 what type of riding and why do you need 17cc domes? Quote
01bansheefox Posted January 7, 2004 Author Report Posted January 7, 2004 I dont know why i need 17cc thats what the yamaha shop said I should put in my shee if I put on a NOSS head or something. I just do like MX whenever i go to the track and cruise around fields and hills out in the country. Quote
dlnoss Posted January 7, 2004 Report Posted January 7, 2004 If your engine is stock except for what you mentioned and you want to run pump gas, I'd go with 21cc domes. If you want to run a mix or straight race gas, you could go with 20cc or 19cc domes. I usually don't recommend anything smaller than 19cc at sea level without a welded crank. Quote
jrm312 Posted January 7, 2004 Report Posted January 7, 2004 hey dlnoss can u run pump gas with 21 domes??? Quote
dlnoss Posted January 7, 2004 Report Posted January 7, 2004 hey dlnoss can u run pump gas with 21 domes??? Most of the time you can run premium pump gas with 21cc domes. In your profile it looks like you are ported running advanced timing. What is your elevation and your compression with the 22cc domes? -David Quote
jrm312 Posted January 7, 2004 Report Posted January 7, 2004 dont know yet in the process of rebuilding upper end just bought your head on ebay and was just wondering if i could run 21 domes and what the difrence would be in power from 22 domes to 21 domes.. i live in michigan macomb twp Quote
dlnoss Posted January 7, 2004 Report Posted January 7, 2004 21's would probably be better. Is a shop doing the porting? Quote
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