Everything fits, no issues
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this top end kit is by far the best! i have 286 hours of hard riding on my bike and it only just now is getting worn! i will never use another brand vertex is the way to go and i have never had any problems with any of my bikes with this top end. theres a good reason every one of the bikes racer x builds uses vertex pistons.
You people are the best thanks!
The vertex piston came along with my hot rods crank rebuild as I was rebuilding the entire bike. Everything was going well, install was a breeze. Locked down the top end and then fired it up. Compression was amazing, I had a hard time kicking down that kickstarter. It ran for 20 seconds on the first kick, then suddenly stopped. Lost all compression, I was able to push the kickstarter down by hand. Skirt and rings were just shot and gouged my cylinder wall.
very pleased with these piston kits, I used these on my 2000 kx250 and they worked great so I decided to try them on my new bike too.
Quality is outstanding, the install went perfectly and the bike runs much better. Ktm uses vertex from the factory, the durability has been outstanding. I highly recommend using this product, the gaskets are very good as well.
Used this in a 2011 kx85. It's been through 2 woods series races and is holding up just fine. Every bit as good as any other brands I've used.
Parts seems of good quality. I like that the needle bearing it comes with us hot rod. Haven't ridden with it yet so I can't speak on power or reliability. My only complaint is it didn't come with the copper crush washers for the head bolts that my YZ 250 has. I didn't notice untill reassembly. Had to order them separately. Would rather pay more for the kit and have them included. Other than that it went together great.
This gave me everything i needed to swap out the top end on my KTM. What a dream, no running back to the shop for a gasket, or needle bearing. I highly recommend this kit, and the Vertex pistons have lasted for me with no issues.
Ordered this kit for 2013 KTM 85 sx. Description says "standard bore'" but apparently, KTM produces engines with "A", "B", and "C" bores from the factory. These are just three different size pistons that vary by a fraction of a millimeter and are fit to each motor individually to help account for variance in machining and plating of the bores. The piston I received was a "B" unit and it turns out that our bike was fitted with a "C" piston from the factory. I wish that the item description had spelled this out so that I could have gotten the "c" piston instead, but there was no mention of this in Motosport's description. I installed the "b" unit and I'm sure it will be fine since I will replace it in about 20 hours anyway.
Shortly after installation of this piston and break in my engine seized. A large chunk of the top of the piston broke off wedging itself between the head and the remaining piston, destroying not only my new piston, but also my cylinder and head.
Researched rebuild days before part showed up. Made job easy.
Great replacement for stock.
Never have a problem with this top end in my sons yz-85
everything you need
This is a great rebuild kit. Very high quality parts. The only improvement that I think could be made is if Cometic decided to put a paper in their gasket kit that labeled each individual gasket and O-ring. Other than that, fantastic product. Just as good, if not better than Wiseco.
Restore the power in your bike byu using quality parts!
Got the piston kit for my cr 125 it had no compression.
After i replaced the piston and ring wow what a difference. Before i changed it i was able to start the bike with my hand. Those days are over .
Love these guys! The vertex piston fit perfectly and the cometic gaskets are working as advertised. In fact, the expansion chamber o-rings fit much tighter than OEM so no more oil spooge from exhaust! Thanks motosport!
I will buy again! Installed on a 97 cr 125 that had a dime size hole in the Piston marked clearly fits factory specifications. Gaskets that come with the kit are way better then the oem paper gasket