This product worked great. Noticable power gain. Easy to install. I will buy again if i ever need a new one
Pro Circuit High Compression Piston Kit
- 11 Reviews
- 26 Questions
The MotoSport.com Pro Circuit High Compression Piston Kit includes one of each of the following components with these attributes:
Pro Circuit High Compression Piston:
Important Note: This piston is for a stock sized bore. Please measure your cylinder to check clearance before ordering.
- Pro Circuit developed their High Compression Piston with the intentions of satisfying the need of your motorcycle's thirst for more power.
- The Pro Circuit High Compression Piston is an exclusive motorcycle engine upgrade that has the ability to boost low-end torque without neglecting top-end power.
- Pro Circuit designed the High Compression Piston to increase overall power whether you are running with a stock or modified head making this an easy way to step up your bike to a whole new level.
- The power gain from the Pro Circuit High Compression Piston does not have to come with the price of expensive race fuel. Pro Circuit designed the High Compression Piston to work with premium pump gas.
- The Pro Circuit High Compression Piston includes a high compression piston, rings, wrist pin, and circlips.
Cometic Top End Gasket Kit:
State-of-the-art gaskets is what Cometic has been doing since its inception in 1989. This comes from their dedication to constructing gaskets for the most demanding race circuits like AMA and NASCAR. Today's lightweight engines are producing more horsepower, higher cylinder pressure, clamp load and extreme temperatures. Cometic's commitment is to provide innovative, quality gaskets while maximizing your engine's power and performance.
This kit contains the following components:
- 1 - Head gasket.
- 1 - Base gasket.
- 1 - Exhaust gasket.
- 1 - Cam chain tensioner gasket.
- 4 - Valve stem seals.
- 1 - Water pipe O-ring.
- 1 - Cylinder water outlet O-ring.
Cometic meets the needs of each specific gasket by using materials to match. Even the basic top end gasket kit features different materials for each gasket. The head gasket is constructed from non-asbestos, flexible graphite that is laminated to a stainless steel core. The manifold and base gaskets are constructed from non-asbestos nitride rubber-bound fiber. Cometic also includes copper gaskets where needed.
Cometic designs and builds their gaskets in the U.S.A.
Note: Image is for reference only, actual item will vary based on contents and fitment.
Nice kit, easy to install, little tuning adjustments were needed.
I bought this top end kit for my 07crf250r after the bike got hot and burned up the rings. It had a high compression piston already so I wanted to keep it the same. I had never been into my bikes engine until then. Following the shop manual along, the installation was a breeze. The bike pulls harder than before, and throttle response is amazing. If you want your bike to have a little extra pep then this piston is for you. If I had to rebuild another I would use this top end kit again. No complaints here! Lovin it!
i blew a head gasket and decited to put in this kit cuz it comes with everything...i had put this same kit in a year ago, but when i pilled the piston out it was a JE not the PC. maybe this new kit will have the pro comp piston and not the JE.
I put this piston in my CRF450R. That thing rips, all RPM ranges. If you can't get a hole shot with this in your bike, its the pilots fault not the bikes. It does tend to be a little bit more sensitive about the octane of the fuel though.
this piston is incredible it adds alot of power and is really reliable it fits perfect and i love the power gains it gave my bike its crazy how just this piston helps your engine
Installed and noticed instant power gains. Good bang for the buck. Made the bike a little harder to start though. But still very satisfied.
Materials and workmanship are good. I found the piston skirt diameter to be on the low end of the OEM new spec. We replaced a long overdue OEM piston on my kids '06 RMZ250, so this new setup, with the added compression, made a noticeable difference.
Watch the oil rings during assembly, I found I had to pay close attention, more so than usual, to holding the rings (by hand, no special tool here) in the groove when sliding the cylinder over it...almost bent a brand new ring.
This is a great product to purchase if your going to race your bike or just ride on the weekends with a couple friends, it offers great low end as well as top end power and is very durable. I would say by far this is the best pistion i have ever purchased.
This kit comes complete and had no fitting problems at all just set ring gap and go. Makes good power ive tried other pistons and they make good power but actually had 1 come apart.