Maintenance & Technical > KX250 / KX125
BEWARE of Pro-x Pistons (pics)
don46:
--- Quote from: maddoggy on September 12, 2010, 12:51:32 PM ---i'm sure you are not the only kx500 running a pro-x piston. makes me wonder about your rod length. not defending pro-x but i would measure your rod compared to a new oem rod. i don't know your bike but you may find a difference(your rod being shorter) especially if you are still running the same rod it had in it when you bought the bike. just a thought.
--- End quote ---
MD, he's running a KX 250, defineately looks longer than the wiesco. for me I'm not a fan of cast pistons, forged only, let the debate begin.
maddoggy:
--- Quote from: don46 on September 13, 2010, 02:43:02 AM ---
--- Quote from: maddoggy on September 12, 2010, 12:51:32 PM ---i'm sure you are not the only kx500 running a pro-x piston. makes me wonder about your rod length. not defending pro-x but i would measure your rod compared to a new oem rod. i don't know your bike but you may find a difference(your rod being shorter) especially if you are still running the same rod it had in it when you bought the bike. just a thought.
--- End quote ---
MD, he's running a KX 250, defineately looks longer than the wiesco. for me I'm not a fan of cast pistons, forged only, let the debate begin.
--- End quote ---
ya i noticed the 250 thing but not until after i already posted it. i would agree on the forged piston. forged is almost always stronger than cast in any metal in any application. i still wonder about rod length though. it sure took a large chunk off.
don46:
[/quote]
ya i noticed the 250 thing but not until after i already posted it. i would agree on the forged piston. forged is almost always stronger than cast in any metal in any application. i still wonder about rod length though. it sure took a large chunk off.
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I would say no issues with the Rod, look at the picture with the wrist pin in the Pro x and Wiseco it looks like its at least .080 to .100 longer than the wiesco which would explain why its breaking as it expands .
Wayfast1500:
It is a hot rods rod, stock specs it isnt a stroker rod or anything. When I had the wiseco I had high compression base and head gaskets and if the rod was too long it should have hit the head. Rod bearings are tight, no vibrations or sounds indicating bad crank bearings or a out of balance/out of true crank. Ive had this bike to the limiter with the wiseco which was the piston in there right before I did all this work.
kwakman:
it sucks that you spend a chunk of hard earned to get it running right and just end up with more problems.there was a video on youtube where a bloke had checked a brand new wiseco crank and found it to be a mile off what it should have been;to cut a long story short, it transpires that wiseco rotating assemblies (not pistons) are being made in china or taiwan or sumthin.pro x are supposedly made by oem manafacturers.if I were you I'd get onto them and throw the rattle out of the pram, but unfortunately that wont help your cylinder.Just because its a relatively rare occurence doesnt mean they should get away with it.
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