A guy on another forum I remember saying that his LT250R didn't like Wiesco pistons and he liked Pro X. Well I'm getting ready to order a new piston as something went wrong in the top end last time I rebuilt it and it only lasted 2 hours or so. Well I have always been told only to buy Wiesco pistons but I am starting to wonder if I should put another one in there or go with Pro X this time like he suggested.

 

Wiseco is generally a step up from your stock piston. It is usually heavier than other aftermarket pistons though.....but also very dependable. Piston's like JE, and others are lighter in weight and are then in turn easier to push.....



My vote is for wiseco.

 

Wiseco makes 2 kinds of pistons for two strokes, standard and pro-lite. Most of the people I know, and my family, have used the pro lite line in our 2 strokes. Pro-x pistons are good, but IMO not significantly different from standard wiseco pistons. In any case you can expect good reliability from any of them, but I prefer the pro-lites.

 

I had a Wiesco Pro-Lite before and ordered another one as Wiesco really seems to be the prefered brand.


Does J.E. make pistons for these quads? For cars I like them a lot and am also rebuilding a 4-stroke dirt bike and putting a big bore kit in it right now that will have a J.E. Piston. I like them a lot. Up until now J.E. or Wiesco were the only pistons I considered but somone reccomended ProX so got me wondering.

I didn't ask about JE as I didn't think they would make one for this quad but I may be wrong do they?

 

I dont know of any JE 2 stroke pistons.

 

a top end shouldn't even be 'broken-in' after 2 hours,

something must have been horribley wrong in that engine, before you assemble the next engine..
make sure you have found and fixed the problem from last time properly...or else the next top end is sure to last another 2 hours....

a friend of mine was in the same boat before, except he just needed to replace his intake boot (between carb and cyl.)
because it had a crack in it and was sucking too much air... also could be the bottom end leaking / sucking in extra air causing
it to run lean and *blow up*

 

I look at it like this who has been making pistons longer and if they made junk they wouldnt be making them anymore Wiesco makes good stuff as do all the major brands just dont go and buy a GB piston because they are half price theres a reason they are half price I do understand saving money but do it on other parts not this one

 

Also if it only lasted 2 hr did you put the piston in backwards ring gap always goes on the intake side on the jug

 

I don't think I put it backwards. Something went wrong as after about 2 hours of use it just died. I pulled it back apart after determining it didn't have compression and the piston had been scraping against the cylinder and the ring seemed to slightly be stock on the pin you close them around. I'm not sure if something else caused it or not. I don't know what happend. I did notice that transmission fluid was all over the exhaust and swingarm when it did this so the bottom end is coming apart to see where it's leaking before it goes backtogether. Would the crankshaft having too much play make the piston hit the cylinder? It has some side to side play but doesn't seem like any up and down. Feels kind of like my DRZ400 one though when I was told it wouldn't be a bad idea to rebuild it.

 

im using a pro-lite now but i prefer the pro-x. pro-x is a supplier to the manufacturers. the fit is tighter on the cast piston(closer tolerence) because they dont need as much room for thermal expansion.as in the wiseco its forged and needs more room to grow when hot. this leads me to believe that there will be more scuffing on the forged ONLY until the piston grows into its hot size(longer warm up time).but the forged will be stronger for higher loads or very high hp apllications.better protection against detonation (poor jetting). also the pro-x makes sizes at .010 increments vs .020 with wiseco. food for thought[img]i/expressions/face-icon-small-happy.gif[/img]