Home
Basic Dirt Bike How-To's - Video
Dirt Bike How-To's - Video
Living The Moto Life - Video
Bike Tests | Shoot-Outs - Video
Forums
What's new
Latest activity
Log-In
Join
What's new
Menu
Log-In
Join
Navigation
Install the app
Install
More options
Close Menu
Forums
Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
pistons for 250f...
Reply to thread
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
[QUOTE="DualSportr, post: 136719, member: 19592"] Wiseco uses a cheaper forging than Arias JE or Ross. Also, the Wiseco piston is MUCH heavier than a forged piston from Arias, JE or Ross (yes, I know Wiseco and JE are owned by the same company, but the forgings they use from Alcoa are different). If you want to talk properties and failure rates Rich, I'm not the person with the specs - call my boss or call JE and talk to John Noonan, or Ross and talk to Honda Jim they'll give you an earful. For anything larger than 70mm, Wiseco pistons have excessive flex. If they are bored in large enough to account for that flex, then you have an engine running with excessive tolerances. JE, Arias and Ross pistons can be bored in at very tight tolerances - .0015" for pistons up to 76mm, and .002" up to 100mm. This means longer life and better ring/cylinder grip. Wiseco is a great option for a cheap rebuild, or for a race two stroke which needs to be rebuilt often. There's very few techs who would recommend them for a four stroke application, or for ANY larger bore engine. Regarding replacement rates on a race YZF 250 - in dyno testing, we've found 5 - 10 hours does start to show some signs of piston fatigue and wear. This would indicate that a replacement in this time frame would be smart. If you're someone who rpm's the YZF lots, also keep a close eye on the timing chain. If it's stretched at all, replace it. Timing chain failure has caused more damage on the YZF's than anything else we've seen. BTW, Yamaha doesn't have any rods (or complete cranks) in stock for the 250 yet. Probably not for another 2 months! The good news? we haven't seen any rod failures from regular use yet. [/QUOTE]
Verification
Which ocean is California closest to?
Post reply
Forums
Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
pistons for 250f...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top
Bottom