bikerjon Posted April 14, 2012 Report Posted April 14, 2012 alright guys. I picked up my 1st shee about 3 weeks ago. Its been a blast to ride. Motor is all stock except for fmf fattys and 2into1 carb. I advanced the timing 4 degrees yesterday and liked the bottom end response. It was slight but definately noticable. I am thinking about the chariot racing cool head and going with 17cc domes. I live at 5500' elevation. the compression is at 100psi now and I think that I should be at 150-160psi with 17cc domes. You guys know how big of a difference this will make on the bottom end? I only ride trails. My 2003 cr250 is pushing 170psi and lugs like a 4 stroke....it helps that it has a power valve, but was wondering how the banshee would respond to a significant bump in compressoon. Thanks DUDES! Quote
Jereme6655 Posted April 14, 2012 Report Posted April 14, 2012 alright guys. I picked up my 1st shee about 3 weeks ago. Its been a blast to ride. Motor is all stock except for fmf fattys and 2into1 carb. I advanced the timing 4 degrees yesterday and liked the bottom end response. It was slight but definately noticable. I am thinking about the chariot racing cool head and going with 17cc domes. I live at 5500' elevation. the compression is at 100psi now and I think that I should be at 150-160psi with 17cc domes. You guys know how big of a difference this will make on the bottom end? I only ride trails. My 2003 cr250 is pushing 170psi and lugs like a 4 stroke....it helps that it has a power valve, but was wondering how the banshee would respond to a significant bump in compressoon. Thanks DUDES! fromthe builder that i talked to.....he said it will wake up e mid/bottom end of the bike by a pretty decet amaount. That being said though....if you dont have a welded crank in your bottom end i wouldn't risk the grenading of a motor for a little more down low dig.... Quote
bikerjon Posted April 14, 2012 Author Report Posted April 14, 2012 fromthe builder that i talked to.....he said it will wake up e mid/bottom end of the bike by a pretty decet amaount. That being said though....if you dont have a welded crank in your bottom end i wouldn't risk the grenading of a motor for a little more down low dig.... I think it would just give me an excuse to go 4mil Quote
Larry's Shee Posted April 14, 2012 Report Posted April 14, 2012 I think it would just give me an excuse to go 4mil Depends on the amount of damage before it stops running Quote
Nightmare Posted April 14, 2012 Report Posted April 14, 2012 alright guys. I picked up my 1st shee about 3 weeks ago. Its been a blast to ride. Motor is all stock except for fmf fattys and 2into1 carb. I advanced the timing 4 degrees yesterday and liked the bottom end response. It was slight but definately noticable. I am thinking about the chariot racing cool head and going with 17cc domes. I live at 5500' elevation. the compression is at 100psi now and I think that I should be at 150-160psi with 17cc domes. You guys know how big of a difference this will make on the bottom end? I only ride trails. My 2003 cr250 is pushing 170psi and lugs like a 4 stroke....it helps that it has a power valve, but was wondering how the banshee would respond to a significant bump in compressoon. Thanks DUDES! Im at 5000 ft and run 17s on my beater and im only pushing 130 on each cyl, 150-160 sounds kinda high Quote
Starwriter Posted April 14, 2012 Report Posted April 14, 2012 I think it would just give me an excuse to go 4mil Do it, do it. Then post pics of the carnage. Quote
bikerjon Posted April 14, 2012 Author Report Posted April 14, 2012 Im at 5000 ft and run 17s on my beater and im only pushing 130 on each cyl, 150-160 sounds kinda high What was your psi before you installed the 17's. Here's some info from noss machine: Approximate Cranking Compression These pressures are estimates based on fresh stock bore, piston, porting, and deck height. It is recommended to check your compression after installation. Sea Level 1000' 2000' 3000' 4000' 5000' 18cc 197 178 171 170 165 145 19cc 183 167 160 158 152 137 20cc 169 156 149 146 140 129 21cc 156 145 138 134 128 121 stock 130 125 118 112 106 100 Quote
Nightmare Posted April 14, 2012 Report Posted April 14, 2012 What was your psi before you installed the 17's. Here's some info from noss machine:they were the first ones we tried and just stuck with them Approximate Cranking Compression These pressures are estimates based on fresh stock bore, piston, porting, and deck height. It is recommended to check your compression after installation. Sea Level 1000' 2000' 3000' 4000' 5000' 18cc 197 178 171 170 165 145 19cc 183 167 160 158 152 137 20cc 169 156 149 146 140 129 21cc 156 145 138 134 128 121 stock 130 125 118 112 106 100 Quote
Finch Posted April 15, 2012 Report Posted April 15, 2012 im at 4500-5000 feet with 19s and have 135, some other guys around me have same domes and setup and have 140-150 think it just all depends on your motor and how fresh it is Quote
bikerjon Posted April 15, 2012 Author Report Posted April 15, 2012 I agree with you there. Is your crank trued and welded? Quote
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