bklf7 Posted April 19, 2007 Report Posted April 19, 2007 I just tore down one side of my motor and found that the piston is scored on four sides like it was cold seized. My cylinder doesnt look bad but not sure. Should I hone that one cylinder out and put the same size piston back in or should I bore both out and put the next size pistons in? The last 4 #s on the piston are 6500. Does that mean they are 10 thousands over stock? I tried to post some pics but it says I cant upload a jpeg file. So if someone can post them for me or just wants to see them I will send them to you. Thanks in advance for the help. Quote
fastrthnu Posted April 19, 2007 Report Posted April 19, 2007 a hone will just give you enough scratch to breakin new rings unless you have alot of time to spend. If the scrapes are deep,. you might need to bore em. when shops bore,. they dont do a full bore and then hone,. the hone finishes the size, but its a machine doing it faster than a guy with a drill. Quote
bklf7 Posted April 19, 2007 Author Report Posted April 19, 2007 Ok thanks I guess I will just have to bring the cylinder over and have them tell what it needs Quote
SoCalinIt Posted April 19, 2007 Report Posted April 19, 2007 I had Jeff at FAST do my bore on my 1989 Banshee. It wasn't very much, and he did a great job. It's worth it if you're second guessing the jug walls. It would suck if you spent all that money on new pistons, gaskets, fluid, and labor, and found out that you needed a bore. Good luck man! Quote
CFM Posted April 19, 2007 Report Posted April 19, 2007 I had Jeff at FAST do my bore on my 1989 Banshee. It wasn't very much, and he did a great job. It's worth it if you're second guessing the jug walls. It would suck if you spent all that money on new pistons, gaskets, fluid, and labor, and found out that you needed a bore. Good luck man! Yup, peace of mind and the correct tolerances (sp?) are a good thing. Quote
bklf7 Posted April 19, 2007 Author Report Posted April 19, 2007 Ok guess I will head over to my machine shop right now and have it done. Thanks for the help Quote
fastrthnu Posted April 19, 2007 Report Posted April 19, 2007 ask them to chamfer the ports too! Quote
bklf7 Posted April 19, 2007 Author Report Posted April 19, 2007 Well just got back I have to have them bored .60 over. What kind of pistons does everybody recomend? Quote
fastrthnu Posted April 19, 2007 Report Posted April 19, 2007 Well just got back I have to have them bored .60 over. What kind of pistons does everybody recomend? wiseco best bang for the buck Quote
bklf7 Posted April 19, 2007 Author Report Posted April 19, 2007 What about Namura Technologies pistons, has anybody heard good things about them? They are 122 for the pair. Quote
bigboybanshee Posted April 19, 2007 Report Posted April 19, 2007 http://cgi.ebay.com/ebaymotors/Yamaha-Bans...109826622QQrdZ1 $125 + 9 bucks to ship. I've always used wiseco, good stuff, plain and simple :beer: Quote
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