bansheerabbit Posted March 1, 2004 Report Posted March 1, 2004 Hi All, I pulled banshee apart this weekend due to lose of compression. 130 right and 125 left with 20thou off head should be around 150 I think. I thought I had broken a ring, the problem is that the left piston the pin that locates the lower ring fell out and made a mess of head and piston but didnot leave a single mark on cyclinders still see hone marks from 6 months ago (new wiseco pistons installed at same time). I have just ordered a new set of rings and will be back together shortly I plan on just filing top of piston flat again and diegrinding head. Has anyone else had this happen??? Rabbit Quote
bkabina Posted March 1, 2004 Report Posted March 1, 2004 I had it happen twice.Also I had many wiseco pistons crack on the skirt near the windows. Quote
frocashmoney24 Posted March 1, 2004 Report Posted March 1, 2004 yea i had one break off at the skirt, a new hot crank hot rods, bore from .50-.80 over and new head had to solve that, not to mention sanding out the bottom end Quote
boonman Posted March 1, 2004 Report Posted March 1, 2004 I would pull the motor down to clean out the crank bearings. or your crank will be the next thing to go. I have never had a piston related problem runnign Wiseco pistons. I will run nothing else. And to the guy that was cracking a skirt on a forged piston tells me something else is wrong with the engine.... Die grinding the head is not a good idea. Get a new dome, or a new stock head. They can be had off Ebay for cheap. If you grind it, you will lose compression and combustion won't be the same. Do as you wish though. it's your bike!! Quote
bansheerabbit Posted March 2, 2004 Author Report Posted March 2, 2004 Thanks for replies guys. I found the locating pin lst night deep inside top of left piston. Order today a new wiseco piston kit. I have another std head but I have a coolhead on ordered so will just tidy up damaged head for now - only has about 20 marks from pin in it. I was looking at my 100thou over RZ piston kit last night from wiseco and noticed that one of the locating pins was a bit lose, before I install the new pistons I will loctite the pin in place or should I return to place of purchase? The only time I have had wiseco's break at skirt near window is when I have opening windows up a lot more than I should have. Rabbit Quote
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