68.4276mm bore

[Zwiser]

My friend got a blaster basket case and the cylinder looks fresh still has the cross hatches the bore is at 68.4276, what size piston should he get?

 

[York Racing]

Uhm I think you would round to a 68.5. Not quite sure what the rings would do for clearance but someone else should know better than me. lol

 

[CHutzell]

thats as far as you can go,you will have to resleeve next time you rebuild the topend,i dont even think wiseco make 68.50mm pistons anymore

 

[Zwiser]

he doesnt have the piston for it, he needs to buy one

 

[Zwiser]

they make a 68.5 banshee piston... this will work right

 

[CHutzell]

not unless its longrod piston,the wrist pin height from the center to the piston crown is taller on the banshee

 

[darederek]

i think tht cylinder is hosed man

 

[sicivicdude]

I think it's time to visit Ebay to find a donor cylinder

Don't chunk that cylinder if it's good for resleeving but 68.5mm is larger than the maximum available piston.

 

[UncagedShadow]

is the blaster a 16mm pin height? If so then the manshee t-rex pistons will work. You can get 68, 68.5, and 69mm pistons. They have a 16mm pin height so if thats the blaster height they should work.It will cost you though. 150 for just the piston.

9521 Series Piston Kit for T-Rex (2nd from the top)

TDR and Banshee Superstore - Your PWC and Yamaha Banshee Performance Source

 

[sicivicdude]

I *believe* that they're talking piston pin diameter not pin to crown height.

 

[scotj77]

who measured it? the largest blaster piston for the stock cylinder is 68.25mm you need to measure it with the proper tools not just a set of calipers

 

[UncagedShadow]

I *believe* that they're talking piston pin diameter not pin to crown height.

haha totally spaced about that. Didnt even think they were talkin bout diameter lol.

 

[CHutzell]

The CL of the wrist pin to the edge of the piston crown on a standard shee piston is taller than the blaster,I'm not familiar with the trex pistons.I bet at 68.50mm what's left of that sleeve is very thin.