zr2highrider Posted March 7, 2010 Report Posted March 7, 2010 So my banshee froze up on me the other day. Took the engine out and started to dig into the top end. Come to find out, it was a bolt that came loose on the pickup in the flywheel housing. Bolt came out, got jammed bewteen the pickup and the flywheel and wouldnt let my engine kick over. No major damage done but now to the point. When I took my top end apart I noticed that on one piston there was a lot more carbon build up than on the other. Anyone got ideas of why this happend? Running to rich on that one side? Or could a airleak cause this to happen? Here is a pic... Another question (probably been asked and awnsered a bit..) My bore was 64.64mm. My piston was 64.44mm. Thats a .20 mm diffrence but it had to rings (probably why I was getting about average compression). That to me is a pretty sloppy bore. So, my question is how much can you bore a set of cylinders before the walls start getting weak and I loose reliability? Quote
TwistedSheeRida Posted March 7, 2010 Report Posted March 7, 2010 Well about the carbon on one piston and not on the other, i really dont know maybe someone else can answer that. The farthest i would bore my cylinders are .080. Any farther than that and your asking for trouble. and yes i believe an .008 thou difference from your piston size is sloppy. Quote
zr2highrider Posted March 7, 2010 Author Report Posted March 7, 2010 Ok, I got to looking at my cylinders more and found that when someone did the porting, they got a little to trigger happy on the dremmil. On the cylinder that doesnt have the carbon buildup, there is a small crack were my intake bolt holes are. Its not a huge crack but a hairline. Could this make one cylidner not have carbon buildup? Quote
TwistedSheeRida Posted March 7, 2010 Report Posted March 7, 2010 Def possible thats what caused it. That side was running leaner because of that airleak and happen to burn off all the carbon. Quote
zr2highrider Posted March 8, 2010 Author Report Posted March 8, 2010 Is there any way to repair a crack like that though? Like I said its not very big... hell if my dad didnt point it out I wouldnt have noticed it. Tig welder possibly? Quote
bonerific250 Posted March 10, 2010 Report Posted March 10, 2010 (edited) pretty sure that it is made out of cast iron and you cannot tig weld it,might be able to braze it but you have to be careful when you it because takes alot of pre - heat in order to be able to move the brazing puddle around and then it should be cooled off in sand over a period of time. more of a pain in the ass. you could try gouging the groove out a lil with a dremel and filling it in with JB weld then fileing it flat. loctite also makes filler that withstands chemicals, fuels, etc.www.loctiteproducts.com Edited March 10, 2010 by bonerific250 Quote
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