they good ? im thinking of getting one put in the blaster.. my choices are weisco yamaha or pro-x if i want my engine rebuilt by trenga

 

Get the Vito's Super Stock Piston.
Vito's is the Best when it comes to the Banshees & Blasters

 

Wiesco hands down for your application. I won't go into the specifics of why the forged wiesco is better than the cast Pro-x, because each have their place. Engines with "windows" in the skirt (such as blasters) should use forged.

I personally am not impressed with anything vito's makes.

 

why? because trenga said they would much rather use tehre pro-x pison vs weisco .. but they said if i wanted to, i could have them put in a weisco.. so why should i get the weisco?

 

if you can go with wiesco,but I had proX in both my mojaves and they lasted a long time and had really good compression

 

If you are a trail rider get Pro X because the cast will absorbe oil naturally making for a very long piston life. If you ride fast or drag race and like to rev high forged (wiseco) would be the choice but they won't last as long as Pro X
Cast will have a longer life than forged that't why virtually every company that offers a 2 stroke puts a cast piston in stock.

 

Wiseco makes all of vito's piston's for the the shee and the blaster.

 

727banshee, the pistons I saw that were supposedly from vito's were cast. The owner might have been lying.

Since you asked, here is my cast vs forged explaination. In a 4-stroke, it doesn't matter unless you are concerned with building a efficient, single purpose (like high reving) engine. In a 2-stroke, you have several different intake and piston types. Piston port and rotary valve engines have a full skirt on the intake and exhaust side. Reed valve engines (with cage in cylinder) have some type of cut out on the intake skirt to allow air into the crankcase when the piston is up. This cut out is either a "window" or a "cutaway". If you would sit a 250r piston next to a blaster piston, you would understand what I mean. The 250r has a half circle cut out of the intake skirt. The blaster has two square "windows". There are a lot of reasons for the two including rod length, intake bridging, etc. The cutaway skirt doesn't have as much resistance to piston slap due to the missing chunk. Windowed pistons still have a full skirt all the way around.

Now, Forged pistons expand more than cast. Because of this, forged pistons require more piston to cylinder wall clearance than cast. The added clearance causes the piston to be loose in the bore. Since the cutaway style piston already need to be tighter due to the increased chance of piston slap because of its design, cast is the better choice. Forged pistons last longer and are more durable, so when possible, they are the best choice.

So, since you have a window style where piston vibration isn't as big of a problem, the forged Wiesco is the way to go. If you had a CR, 250r, or other cutaway style, I would recommend the cast Pro-x.

Richard

 

ok i see what your saying.. why does trenga recemend i get the pro-x though? i race MX so i would be doing alot of reving and stuff.

 

Ask the guys at Trenga exactly why they like the Pro-x for a blaster. The prox is probably cheaper at least it should be. Let me know what they say.