rebuilding a blaster

[bansheeman1974]

Hello everybody i am redoing a yamaha blaster top end i have done this before but i am kinda stumped i took the top end apart and looked on top of the piston and it has 50 on it does that mean it is 50 over or what i looked at rmatv and thay have kits for 20,40,60 over but nothing that is 50 over need help thanks.also it does not need to be board out just honed thanks.

Edited February 13, 2006 by bansheeman1974

[watkins]

Guys correct me if im wrong but:

 

50 means .50 MM so that would be .020 inches or 20 over.

[Ducman]

67.25mm is .050" over for a blaster piston. Vito's sells .050" over pistons in the superstock design. Measure the piston with a set of dial calipers to get the exact diameter, then you'll know what ya got. I wouldn't order a piston unless you know for sure what size, avoid the hastle of having to return parts.

[bansheeman1974]

well thanks for the help guys but i am getting to diffrent things here is it 50 over or 20 over ??

[Lethaface]

Blasters pistons are available from wiseco in std,10,20,30,40,50,60,70,and 80..I'm not sure about your number, but wanted to let you know that .50 over is out there..Ducman's advice will get you straightend out though

[watkins]

Like I said I was just guessing at the 50.. so take ducmans advise and measure that piston.

[bansheeman1974]

thanks watkins for the help

[antmortem]

If it is a wiseo piston the number on top is 50mm. There should be some other numbers on top which you can match to the wiseco part numbers. A .20 over piston would be 66.5mm if you measure it with a caliper.

Edited February 14, 2006 by antmortem