Posts
202
Joined
2/20/2015
Location
GB
Edited Date/Time
9/8/2017 4:01am
Recently I bought a 2013 yz250 with only one owner from new which had been sat in a garage for over 2 years due to injury. The bike came with the full spares kit! I began stripping the bike yesterday and found it was fitted with a vertex piston, which got me thinking why would someone put a vertex in there when they have a genuine top end kit sat there? The piston fitted was a size A (66.34) even though the cylinder is clearly stamped with a C, and the piston in the spares kit is green (66.36). I'm guessing that's why the piston looked like this when I removed it......
You cant go wrong with pistons unless you buy namura.
Maybe the P.O. bought the spare kit after the Vertex was installed?
+1 on the Namura stuff being good for AR-15 target practice, just don't make the mistake of putting one in an engine.
The Shop
I had a customer come in with a yz250 that "wasnt running right" even after 200 hours and shattered skirts this 13 yz250 still ran!
25-30 hours for a 125 and 45-50 for a 250 for a casual rider who doesn't race.
I can not ride it for 20 hours without tearing and splitting apart. I replace the original around 15hours and putr a vertex in, I can ride for 25 hours and it will be very good.
Bought my yz125 new from the store, first piston replaced at 20 hours and was planning to run the kit piston for another 20.
However a friend of mine that was running the same bike with an almost similar setup had his locating pin come out at 7 hours. You can imagine the damage with a turning pistonring that gets to know your exhaust port....
So after that i pulled out my oem piston at 8 hours and run vertex ever since then
Post a reply to: Any reason not to run oem Yamaha pistons?