JUGGS Posted May 14, 2007 Report Share Posted May 14, 2007 Ok i have a 2002 banshee with these mods. cool head with 21cc domes, v-force 2 reeds, weisco pro lites stock bore, timing is advanced 4 degrees and fmf pipes, I am at 500 feet above sea level.. My question is do i need to run more than 93 octane pump gas i just got to ride it today and i'm hearing a slite nock or pinging sound other than the pipes.. I can hear it at idle and it gets louder when its under a load... Am i getin detination from lack of octane or what am i missing?? Thanks Matt Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted May 14, 2007 Report Share Posted May 14, 2007 Run 100% race gas. If the sound you are hearing goes away then try 50/50. Still no strange sound try 25/75. If the sound comes back then you know you will need to a little more race gas with regular. Start at 100% and ween it down until you her the pinging come back and then up the % a little more until it goes away. Lean jetting can aslo make pining worse. Try backing your timing off if you dont want to run race fuel. Quote Link to comment Share on other sites More sharing options...
CRAZY-SHEE! Posted May 14, 2007 Report Share Posted May 14, 2007 idk.. 21cc domes shouldnt need race gas.. do a compression test.. Quote Link to comment Share on other sites More sharing options...
Washburn Posted May 14, 2007 Report Share Posted May 14, 2007 idk.. 21cc domes shouldnt need race gas.. do a compression test.. True but he also has his timing advanced and you can never really tell with that. plus the 500ft asl is bumping it. Definatly do a compression test. Take jbookers advice. You can also try going to a local airport and buying 100AV fuel. It costs like 4-4.75 a gallon just run that straight. What ratio are you mixing your fuel at? Just curious Quote Link to comment Share on other sites More sharing options...
06BaNsHeE Posted May 14, 2007 Report Share Posted May 14, 2007 Do a compression test.If your at 155-170 Run Straight av gas or 50/50 race with 93 pump.Anything over 170 I would run straight race gas Quote Link to comment Share on other sites More sharing options...
06BaNsHeE Posted May 14, 2007 Report Share Posted May 14, 2007 I curenntly pay 3.50$ per gallon for av gas Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted May 14, 2007 Report Share Posted May 14, 2007 I curenntly pay 3.50$ per gallon for av gas I get citgo 110 for $4 Quote Link to comment Share on other sites More sharing options...
bigboybanshee Posted May 14, 2007 Report Share Posted May 14, 2007 Pinging is definitely a sign of detonation, but like said before, with 21cc domes you should be about 150psi on a fresh top end. I ran 21cc's at the same elevation, similar mods and +4 timing with 93 octane; no problems. Now I run 160psi with +4 timing and am still on pump, no detonation, plugs look good, 400ft above sea level. I would listen closer to the noise, see if it's definitely coming from the cylinders. Could it be a water impellar making that noise? Maybe your kickstarter is wearing out? Just some ideas, could be a loose bolt somewhere for all you know. Always check the simplest things first. I had a weird rattling noise come from my blue bike that had me worried...come to find out I didn't tighten my clutch cover insert down and it was making all kinds of racket, lol Quote Link to comment Share on other sites More sharing options...
SoCalinIt Posted May 14, 2007 Report Share Posted May 14, 2007 I get citgo 110 for $4 DAMN! Must be nice... I'm paying $9 for TRICK 110 here in SoCal. Quote Link to comment Share on other sites More sharing options...
06BaNsHeE Posted May 14, 2007 Report Share Posted May 14, 2007 8$ a gallon for VP C-12 Quote Link to comment Share on other sites More sharing options...
blowit Posted May 15, 2007 Report Share Posted May 15, 2007 Ok i have a 2002 banshee with these mods. cool head with 21cc domes, v-force 2 reeds, weisco pro lites stock bore, timing is advanced 4 degrees and fmf pipes, I am at 500 feet above sea level.. My question is do i need to run more than 93 octane pump gas i just got to ride it today and i'm hearing a slite nock or pinging sound other than the pipes.. I can hear it at idle and it gets louder when its under a load... Am i getin detination from lack of octane or what am i missing?? Thanks Matt You should not be into race fuel territory with that combination. I too would want to check jetting and static compression. Lean motors will detonate. If possible and if you have enough time on the plugs, post a closeup of your plugs. A sure sign of detonation is fine metallic specs on the plug which it metal transfer from the piston. I am not convinced that you are detonating just yet. It is a good test though to run a small amount of race fuel just to test for a sound change in the motor. Obvious detonation is hard to miss. Let is know. Brandon Quote Link to comment Share on other sites More sharing options...
CRAZY-SHEE! Posted May 15, 2007 Report Share Posted May 15, 2007 DAMN! Must be nice... I'm paying $9 for TRICK 110 here in SoCal. u made my wallet cry :sad: Quote Link to comment Share on other sites More sharing options...
RoostRocket Posted May 15, 2007 Report Share Posted May 15, 2007 8$ a gallon for VP C-12 7.50 for trick 114 Quote Link to comment Share on other sites More sharing options...
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