Chip M Posted April 5, 2012 Report Share Posted April 5, 2012 (edited) When I pulled my head for squish test I found a big difference in the looks of my pistons. They have about 4 or 5 hours on them. I was thinking to see some burnt oil because I know i am still running rich but should there be so much difference? They are very smooth, no pits, just color. All opinions welcome!! Leakdown test was sweet and carbs are sync'd only by eye but it seems to run/idle well and sounds good all though the gears. I do think it is missing some of the power it should have. Sync tool coming soon. 96 Banshee-64.75 mm bore V Force Reeds/Cages ProDesign Cool Head FMF Gold Series Fatty's- Powercore 2 Silencers K&N Air Filter-stock box w/lid-no snorkel Timing +4 Presently 300 main jets-27.5 pilots 93 octane @ sea level-80 deg. F Hard trail / MX style riding Edited April 5, 2012 by Chip M Quote Link to comment Share on other sites More sharing options...
Phelps Posted April 5, 2012 Report Share Posted April 5, 2012 looks water washed.... sure you didn't have a coolant leak? Quote Link to comment Share on other sites More sharing options...
Nightmare Posted April 5, 2012 Report Share Posted April 5, 2012 Quote Link to comment Share on other sites More sharing options...
Chip M Posted April 5, 2012 Author Report Share Posted April 5, 2012 looks water washed.... sure you didn't have a coolant leak? I was not losing any from radiator but when I took of the head I did not drain front hose first(what a dumbass). When I caught what was happening after the head was loose, I snugged head bolts back up to stop flow and pulled the hoses to drain, I then continued to remove the head. Would it wash it off that quick or would it have to wash while bike was running? Quote Link to comment Share on other sites More sharing options...
Chip M Posted April 5, 2012 Author Report Share Posted April 5, 2012 Does the dark one look pretty normal for 4 or 5 hours of run time on new piston? Quote Link to comment Share on other sites More sharing options...
Nightmare Posted April 5, 2012 Report Share Posted April 5, 2012 I dont think it wash off that fast Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted April 5, 2012 Report Share Posted April 5, 2012 I only washes off the carbon while it's running with a coolant leak......it takes the coolant and immediately heats the hell out of it.....so it wind up as steam and sort of steam cleans your pistons.... Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted April 5, 2012 Report Share Posted April 5, 2012 As the others have stated, that side is washed. I would very carefully inspect the cylinders for flatness with a straight edge and make sure there are no nicks or gouges in the o-ring sealing surfaces. Also look for any debris or foreign material that may be keeping the head from sealing down tight. How did your domes and dome o-rings look? If the dome o-rings are burnt looking it is likely from mild detonation due to the high compression you're running on 93 octane. After you are able to get this back together do a cooling system pressure test at 16-20 psi as well as a leakdown test. I would imagine it was pushing fluid from the radiator overflow as a combustion leak will generally allways preasurize the cooling system. -Brandon Quote Link to comment Share on other sites More sharing options...
Chip M Posted April 5, 2012 Author Report Share Posted April 5, 2012 Got it. I am on my way out to the garage to get started. I will update to show progress.Thanks to all for the replies Quote Link to comment Share on other sites More sharing options...
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