hauser2169 Posted December 14, 2009 Report Posted December 14, 2009 so i got my cylinders bored from jeff with pistons and all. broke it in with about a tank and half. occasonally gettin on it. well then i wanted to open it up a little so i was in 3rd and pinned it till 4th. rode 4th and then backfire. pulled into my barn, pulled the head and head was all scared and dented up. piston looks to be detonated. cylinder has a deep gouge from the ring. my left cylinder still holds 125 psi. i reused my jets i had before the build which were 240. maybe i had an airleak? or just way to lean. now im lookin for a new set of cylinlers. i was thinkin vito's cylinders and pistons since i need new of everything.. here is what im lookin at . My link are these good. any of you guys runnin these? my shee is a stock stroke any help wil be appreciated Quote
WantABanshee Posted December 15, 2009 Report Posted December 15, 2009 ttt i dont want this to happen to me. what happen? Quote
FASTOYS Posted December 15, 2009 Report Posted December 15, 2009 so i got my cylinders bored from jeff with pistons and all. broke it in with about a tank and half. occasonally gettin on it. well then i wanted to open it up a little so i was in 3rd and pinned it till 4th. rode 4th and then backfire. pulled into my barn, pulled the head and head was all scared and dented up. piston looks to be detonated. cylinder has a deep gouge from the ring. my left cylinder still holds 125 psi. i reused my jets i had before the build which were 240. maybe i had an airleak? or just way to lean. now im lookin for a new set of cylinlers. i was thinkin vito's cylinders and pistons since i need new of everything.. here is what im lookin at . My link are these good. any of you guys runnin these? my shee is a stock stroke any help wil be appreciated Definetly lean from either an air leak or jetting i would say. Did you pressure test it? Getting cold out, may want to bump the mains too. Quote
dirtydownunder Posted December 15, 2009 Report Posted December 15, 2009 240 is lean, even lean with the airbox and lid, are you running the airbox with lid ? Quote
bbcmudtruck Posted December 15, 2009 Report Posted December 15, 2009 What bore are your cylinders on now? Just rebore them again if you can, especially if they are ported. Quote
Bansh-eman Posted December 16, 2009 Report Posted December 16, 2009 What bore are your cylinders on now? Just rebore them again if you can, especially if they are ported. What he said. Next time make sure you do a pressure test. Where are you riding? Elevation, temp, and mods. 240 on stock carbs is very lean unless your riding at like 5,000 ft Quote
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