DirtDiggler69 Posted January 30, 2011 Report Share Posted January 30, 2011 So I am modding a 2-1 Intake from a Yamaha Exciter for my shee , I pulled the reed cages and in the left cylinder , on the edge of the intake port on the piston , a damn crack . This is a fresh rebuild and Its hardly got a break in on it . BUT when I had it out at Florence last year ( I had just bought it ) the left side carb cable adjuster came loose and it revved huge ( did it several times limping it back to camp ) . Im thinking that fatty airleak did it . The other one looks fine from what I can see. Opinions wanted , just replace the piston and rings on the one cylinder? or new set? Quote Link to comment Share on other sites More sharing options...
crustydemon Posted January 30, 2011 Report Share Posted January 30, 2011 Just do them both while your at it, then there is no question weather the other one is bad or not. Quote Link to comment Share on other sites More sharing options...
DirtDiggler69 Posted January 30, 2011 Author Report Share Posted January 30, 2011 Just do them both while your at it, then there is no question weather the other one is bad or not. Thats what I was leaning towards Crusty , I checked ebay , I can get a complete top end for less than 150.00 , Namura Pistons and gaskets . Quote Link to comment Share on other sites More sharing options...
Coupelx Posted January 30, 2011 Report Share Posted January 30, 2011 excessive piston to cylinder wall clearance causes skirt cracks. Quote Link to comment Share on other sites More sharing options...
trx4502shee Posted January 30, 2011 Report Share Posted January 30, 2011 imo i would stay away from Namura I've had nothing but trouble with them you know the saying you get what you pay for...lol I like wiseco pro lite they are made different i think one is forged and the other is cast i think I know Namura will crack and come apart in your cylinder were as wiseco will usually bend instead of crack just my .02 Quote Link to comment Share on other sites More sharing options...
DirtDiggler69 Posted January 30, 2011 Author Report Share Posted January 30, 2011 imo i would stay away from Namura I've had nothing but trouble with them you know the saying you get what you pay for...lol I like wiseco pro lite they are made different i think one is forged and the other is cast i think I know Namura will crack and come apart in your cylinder were as wiseco will usually bend instead of crack just my .02 Hey I like that 2 cents , I have a wiseco in my blaster and rode it hard at florence and no issues . I'll get wiseco forged pistons and bite the bullet and get the cylinders bored . I sent out my blaster head to a shop in Florida , they bored and honed and sent it back with a piston kit for a reasonable price , plus return shipping was free . I may go that route again. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted January 30, 2011 Report Share Posted January 30, 2011 excessive piston to cylinder wall clearance causes skirt cracks. As said get your bore checked,revving doesnt crack skirt,loose pistons do,so many people just think hone it and put new pistons in,I have taken apart hundreds of motors very few had straight n tight bores.There is nothing like a tight hole Quote Link to comment Share on other sites More sharing options...
Jereme6655 Posted January 30, 2011 Report Share Posted January 30, 2011 send your stuff to a site sponsor.....i trust Jeff at FAST for all my stuff. Our site sponsors can get you a top end rebuild cheaper than you can usually get it anywhere else. plus these guys eat sleep and live banshee's.....so there's no question as to whether they are good at what they do or not... Quote Link to comment Share on other sites More sharing options...
armyvet Posted February 1, 2011 Report Share Posted February 1, 2011 too much cylinder bore wear can wreck any piston.i have used namura b4 in the past with good results.But then again im not racin.Regardless of product,installation is everything.Wisecos are good choices but i have been in binds b4 as well where what i want and what my finances will allow are different things..lol it happens Quote Link to comment Share on other sites More sharing options...
DirtDiggler69 Posted February 2, 2011 Author Report Share Posted February 2, 2011 Gonna send it to Passion , 265.00 for a New top end is very reasonable , just doing a stocker for now . Next time around I'll get some porting done . Quote Link to comment Share on other sites More sharing options...
shanYE west Posted February 2, 2011 Report Share Posted February 2, 2011 excessive piston to cylinder wall clearance causes skirt cracks. yah.. that Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted February 3, 2011 Report Share Posted February 3, 2011 i got vertex pistons off ebay,150.00 with gaskets they lasted about 3 hours before the left side skirt came off.i pulled the top end off,pistons looked good no signs of heat failure just no skirts left. Quote Link to comment Share on other sites More sharing options...
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