bladesracing Posted August 6, 2010 Report Share Posted August 6, 2010 I have a 4 mil with ported stock heads. Every time I go the dunes I blow a head gasket. Any ideas? Quote Link to comment Share on other sites More sharing options...
SLORYDER Posted August 6, 2010 Report Share Posted August 6, 2010 I have a 4 mil with ported stock heads. Every time I go the dunes I blow a head gasket. Any ideas? Pull the heads and inspect the mating areas closely for defects. If there are none, make sure that you're torquing the head down to spec. If all else fails, get your stock head rechambered by Brandon at Mull. Stock type head gaskets are much more reliable, plus you will get a dome custom cut to your bike. GL Quote Link to comment Share on other sites More sharing options...
So Cal Suspension Posted August 6, 2010 Report Share Posted August 6, 2010 Pull the heads and inspect the mating areas closely for defects. If there are none, make sure that you're torquing the head down to spec. If all else fails, get your stock head rechambered by Brandon at Mull. Stock type head gaskets are much more reliable, plus you will get a dome custom cut to your bike. GL Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted August 6, 2010 Report Share Posted August 6, 2010 Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted August 7, 2010 Report Share Posted August 7, 2010 You have a rechambered stock head right? Check and make sure its not warped, check your mating surfaces both on the head and top of the cylinders, check your squish and compression. Quote Link to comment Share on other sites More sharing options...
bansheesandrider Posted August 7, 2010 Report Share Posted August 7, 2010 Also check that the deck height of both cylinders is equal. If it is not it will not put equal clamping pressure on the gasket. Quote Link to comment Share on other sites More sharing options...
AKheathen Posted August 9, 2010 Report Share Posted August 9, 2010 um, first things first- are you retorquing the head after a few heat cycles? it will most likely blow if you don't Quote Link to comment Share on other sites More sharing options...
camatv Posted August 9, 2010 Report Share Posted August 9, 2010 are the o-rings your putting on the DOMES BLACK in color OR brown? they ABSOULTELY MUST BE viton's. they are brown in color. PLUS it sounds to me like your either to LEAN on top end OR using too low octaine fuel, with too much compression if you have poped the head a few times its most likely warped and the domes are damaged also.. Quote Link to comment Share on other sites More sharing options...
Burt Reynolds Posted August 10, 2010 Report Share Posted August 10, 2010 I have had 3 straight K and S head gaskets fail on me,brand new right out of the pack. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted August 10, 2010 Report Share Posted August 10, 2010 I had an issue like yours once.Someone put a coolhead rite over a stock gasket and clamped it down,from the motor running the head gasket walks around a little and grooves the cylinder.So when I rebuilt this motor I put it together the rite way and it blew o-rings as soon as it got hot enouph for the head to start walking.I redecked the cylinders .012 and problem was solved Quote Link to comment Share on other sites More sharing options...
bladesracing Posted August 11, 2010 Author Report Share Posted August 11, 2010 Thanks for all the ideas! I'm hoping to start tearing it apart this weekend. Quote Link to comment Share on other sites More sharing options...
Rodneya Posted August 11, 2010 Report Share Posted August 11, 2010 are the o-rings your putting on the DOMES BLACK in color OR brown? they ABSOULTELY MUST BE viton's. they are brown in color. PLUS it sounds to me like your either to LEAN on top end OR using too low octaine fuel, with too much compression if you have poped the head a few times its most likely warped and the domes are damaged also.. Did you even bother to read anything in the original post before offering up your pearls of wisdom? Quote Link to comment Share on other sites More sharing options...
So Cal Suspension Posted August 11, 2010 Report Share Posted August 11, 2010 Did you even bother to read anything in the original post before offering up your pearls of wisdom? I don't really see what's wrong with his post. I mean, the thread title says "mod quad" at the end of it, which would lead me to believe he has a modquad cool head. Secondly, his original post says "ported stock heads". My assumption on that would be "ported stock CYLINDERS", I may be wrong... but I think this is the OP's fault for not elaborating on what equipment he's running. Quote Link to comment Share on other sites More sharing options...
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