rjbestracing Posted March 29, 2007 Report Share Posted March 29, 2007 took apart motor because i blew both pistons, and noticed that the cool heads domes had an imprint of 18cc is this a high compression dome,? and what is the difference between 18cc and 22cc cool head domes, keep in mine bike was purchased like this never open block before/ Quote Link to comment Share on other sites More sharing options...
yamaha04 Posted March 29, 2007 Report Share Posted March 29, 2007 omg did you run race fuel. if not thats the reason you blew it up. you compresstion depending on your elevation would be 190 to 160 psi if closer the sea level the highter the compression is. stock done is 22 cc i think if you use them you will be able to run pump gas but you will lose some low end. Quote Link to comment Share on other sites More sharing options...
rjbestracing Posted March 29, 2007 Author Report Share Posted March 29, 2007 omg did you run race fuel. if not thats the reason you blew it up. you compresstion depending on your elevation would be 190 to 160 psi if closer the sea level the highter the compression is. stock done is 22 cc i think if you use them you will be able to run pump gas but you will lose some low end. damn thats wat happen then, cause the gas that the bike came with ran out so i put premium with 4 bounces of caster 927, i live in florida so your saying i need to run race fuel Quote Link to comment Share on other sites More sharing options...
dajogejr Posted March 29, 2007 Report Share Posted March 29, 2007 damn thats wat happen then, cause the gas that the bike came with ran out so i put premium with 4 bounces of caster 927, i live in florida so your saying i need to run race fuel Hell Yes. Straight 110 octane... Quote Link to comment Share on other sites More sharing options...
fastrthnu Posted March 30, 2007 Report Share Posted March 30, 2007 buy some 21-22cc domes (and pistons) Quote Link to comment Share on other sites More sharing options...
RagunCajun Posted March 30, 2007 Report Share Posted March 30, 2007 i thought u could run 20cc domes on 93 octane.....? :ermm: I got a NOSS head and i was planning to go 20cc on the domes and advance my timing by 4* after my aggresive port job is done. Quote Link to comment Share on other sites More sharing options...
fastrthnu Posted March 30, 2007 Report Share Posted March 30, 2007 i thought u could run 20cc domes on 93 octane.....? :ermm: I got a NOSS head and i was planning to go 20cc on the domes and advance my timing by 4* after my aggresive port job is done. depends on your elevation I guess. Where Im at I cant go over 21cc with 93. At 3000ft maybe 20 or 19 would be ok. Quote Link to comment Share on other sites More sharing options...
375hp banshees Posted March 30, 2007 Report Share Posted March 30, 2007 i thought u could run 20cc domes on 93 octane.....? :ermm: I got a NOSS head and i was planning to go 20cc on the domes and advance my timing by 4* after my aggresive port job is done. 20 is border line for us southerners Quote Link to comment Share on other sites More sharing options...
yamaha04 Posted March 30, 2007 Report Share Posted March 30, 2007 rule of thumb cheack compression before fireing. if over 150 psi i would run a mix 50/50 race/pump if over 170 i would run straight. not quote me on that its just a guess but definatly cheak before running. Quote Link to comment Share on other sites More sharing options...
04titanse Posted September 6, 2007 Report Share Posted September 6, 2007 i know this is an old post so sorry, but i figured it was better than starting a new one. anyways....can i do 21 or 20cc cool head without doing a port job. my banshee will have t5 pipe set, carbon fiber reeds, dynojet jet kit, k&n filter w/o lid just to get an idea of were i am at. Avg temp 65-75 at around 500ft above sea level. thanks Quote Link to comment Share on other sites More sharing options...
Ducman Posted September 7, 2007 Report Share Posted September 7, 2007 i know this is an old post so sorry, but i figured it was better than starting a new one. anyways....can i do 21 or 20cc cool head without doing a port job. my banshee will have t5 pipe set, carbon fiber reeds, dynojet jet kit, k&n filter w/o lid just to get an idea of were i am at. Avg temp 65-75 at around 500ft above sea level. thanks If you want to be on the safe side do the 21cc domes. If you can get 93 octane at the pump, you keep your timing stock, no advance then you could probably do the 20cc domes. You definitely dont want to be too lean on your jetting or that will cause detonation too. I destroyed a motor one time because I could use 100 octane near home at 500ft elev and above but I went to the Oregon doons, sea level, in cold air and tried my needle at a leaner setting. I knew it was running lean at part throttle and was going to change it back to the previous setting but my pistons were already toast after running like that for 1 hour. Quote Link to comment Share on other sites More sharing options...
odaen Posted September 7, 2007 Report Share Posted September 7, 2007 took apart motor because i blew both pistons, and noticed that the cool heads domes had an imprint of 18cc is this a high compression dome,? and what is the difference between 18cc and 22cc cool head domes,keep in mine bike was purchased like this never open block before/ what elevation are you at? Quote Link to comment Share on other sites More sharing options...
04titanse Posted September 7, 2007 Report Share Posted September 7, 2007 If you want to be on the safe side do the 21cc domes. If you can get 93 octane at the pump, you keep your timing stock, no advance then you could probably do the 20cc domes. You definitely dont want to be too lean on your jetting or that will cause detonation too. I destroyed a motor one time because I could use 100 octane near home at 500ft elev and above but I went to the Oregon doons, sea level, in cold air and tried my needle at a leaner setting. I knew it was running lean at part throttle and was going to change it back to the previous setting but my pistons were already toast after running like that for 1 hour. i have an adjustable timing plate i want to instal so does that mean i should def. just do the 21cc and like a few degress advanced timing? I can 93 pump no problem just not higher Quote Link to comment Share on other sites More sharing options...
DuneRaider Posted September 9, 2007 Report Share Posted September 9, 2007 i just had the same problem, i had 17cc domes in mine and the pistons blew so i am ordering the 22cc domes. Quote Link to comment Share on other sites More sharing options...
Nitmare67 Posted September 9, 2007 Report Share Posted September 9, 2007 i just had the same problem, i had 17cc domes in mine and the pistons blew so i am ordering the 22cc domes. Gotta love the feeling of kicking over 180psi compression. Just run 4+ timing and straight c110. Fuck it. Quote Link to comment Share on other sites More sharing options...
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