what kind of piston i should put ???

You won't know what size piston you will need until you take it apart and inspect the damage, if any. Do that first, then worry about which brand.

Yes get a micrometer and measure the cylidner bore. How did you blow it ? 300 main sounds rich it shouldnt have blown , most people run 280s with a pipe And filter and are fine

my shee is stock im a mecano and i know i gonna oversize my shee but what u recomend for the piston brand some Yamaha , Wiseco or vertex piston ???

Weisco is a good piston for the shee thats what I have but you should be happy with about any aftermarket pistons. They are a little more forgiving than stock

The Wiseco pistons are forged, and are tuffer. But you have to let the motor warm up befor you slam on the gas. The stock pistons are cast and are not as tuff, but don't need to be warmed up befor running hard.
Take the motor apart and get it miced befor you buy the kit. Are you doing the work yourself?

All pistons need a little warming to give them time to expand, when cold they make a harmonic slap and stock pistons shatter. I havent seen a weisco skirt explode but thats just me.

yes i gonna do de job myself im a small engine repair mecanic and the 2 strokes is the best hehehe i think i gonna put some Wiseco

a 2004 banshee shouldnt blow up just like that, something must be up, but i would definatly go with vitos pistons, dont waste any bores with it, you wont see any power gains untill u got .80 and even then it is small gains

its normal to blow wen u burn a lots of pair of tire (6 pairs) on the rear and 1 on the front and i have a lots of mileage on my shee i got it for 9 month 2 thank a day average and i think i have 7000miles on it and i use amsoil 20:1

its normal to blow wen u burn a lots of pair of tire (6 pairs) on the rear and 1 on the front and i have a lots of mileage on my shee i got it for 9 month 2 thank a day average and i think i have 7000miles on it and i use amsoil 20:1

20:1 is way too much oil. What type of Amsoil are you running?

um, a banshee shouldn't even run 20:1 or if it did, it would be bogging down and barely run :tdown:

I run my Banshee with Amsoil at 24:1. That's what my Yamaha dealer recomends me to use...

Waz Up said:

I run my Banshee with Amsoil at 24:1. That's what my Yamaha dealer recomends me to use...

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Just wondering do you ever fowl plugs?

Nop, I have about 35 tanks of gas on my Shee and only put 3 sets of plugs. I never really fowl my plugs I just change them after a while.

I run my Banshee with Amsoil at 24:1. That's what my Yamaha dealer recomends me to use...

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Do you buy your oil from them as well? :roll:
I run the Dominator oil 50:1 no problems what so ever. Amsoil guarantees your engine will not fail due to inadaquet lubrication if you use it at the ratio they recommended.

no i never fouled a spark plug and the problem my shee blower its the ring turn and grind in the exaust port the ring was to wear 6 month old banshee hehehe i think is default on Yamaha Piston cause my compression as 112psi before it blow!!!!!!

I run Amsoil Dominator 40:1 (approx. 3 .oz per gallon) and never have any problems, I love this $hit

If there's cylinder damage, you will have to bore it, although you will want to go out as little as is necessary. Keep in mind that Vito's pistons are just Wisecos with the windows in the skirts hogged out to allow more fuel/air charge into the crankcase. This does result in more power, but weakens the piston skirts. Somebody who puts as many miles/hours on their rig as you do may want to consider just getting Wiseco Prolites.