Pro Circuit High Compression Piston Kit

Pro Circuit High Compression Piston Kit
Pro Circuit High Compression Piston Kit

$285.99 - $431.99
10% Off - Save up to $30.99

  • Description
  • 11 Reviews
  • 26 Questions
  • Fitment
Description Item #PRC0037

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.


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11 Reviews
4.9 out of 5 stars
5 Star   11 4 Star   1 3 Star   0 2 Star   0 1 Star   0
gmunney423
williamsport pa
High compression

This product worked great. Noticable power gain. Easy to install. I will buy again if i ever need a new one

eog118
clermont fl

Great product

motoIsChurch
Lincoln, CA
Durability   Ease of Installation   Performance   Power   Style  
Worth while

Nice kit, easy to install, little tuning adjustments were needed.

propracticer
Staley, NC
Durability   Ease of Installation   Performance   Power   Style  
Awesome

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!

mgalik
alb new mexico
Durability   Ease of Installation   Performance   Power   Style  
Didnt get a pc

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.

Pro Circuit High Compression Piston Kit
cyclefun9480
Carson City, Nv
Durability   Ease of Installation   Performance   Power   Style  
Good investment

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.

steven13
Top 500 Contributor
wewahitchka florida
Durability   Ease of Installation   Performance   Power   Style  
Awesome

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

Lawrence, KS
Great power for the $

Installed and noticed instant power gains. Good bang for the buck. Made the bike a little harder to start though. But still very satisfied.

mostoyzwinz
Top 10 Contributor
CT
Just what the doctor ordered

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.

Coatesville, PA

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.

sotyphoon
baltimore maryland
Great kit!

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.

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26 Questions
Answered:   26
Not Yet:   0
Londonn
Location: Compton
Q: I have a 2007 kx 450 do I have to bore or modify culver to install or jus install it?
1 year ago
MotoSportExpert
MotoSport Staff Expert
1 year ago
A: No you would not need any additional modifications. Pro Circuit High-Compression Pistons work equally well in stock or modified engines giving you more power at every rpm.
Nick
Location: Virginia, USA
Q: CRF150R Compression?
1 year 1 month ago
Whats the compression ratio if im buying this for my CRF150R? The stock compression for the 150R is 11:7:1
MotoSportExpert
Expert MotoSport Staff
1 year 1 month ago
A: Unfortunately Pro Circuit does not provide specs on this piston. I would contact them directly at 951-738-8050.
murkopolo82
Location: missouri
Q: Is this available for '09 klx250s?
1 year 5 months ago
MotoSportExpert
Top 1 Contributor
1 year 5 months ago
A: No. This is not available for your KLX250S bike. We do offer other options in pistons that will be a stock replacement.
dclifton426f
Location: Farmer City, IL 61842, USA
Q: Is this piston kit compatible with a yz426f?, and if so what is the compression ratio?
1 year 6 months ago
MotoSportExpert
Top 1 Contributor
1 year 6 months ago
A: Pro Circuit does not list an application for the YZ426 bikes. We have other piston kits available for you. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
03cr85rb
Q: Could I but this instead of a top end kit for my cr85 if I wanna rebuilt my top end?
1 year 8 months ago
MotoSportExpert
Top 1 Contributor
1 year 8 months ago
A: The Pro Circuit High Compression piston kits are for select model of machines. We have top end kits on our website for your CR85
Jensen
Q: Compresion ratio on this piston kit for yz250f 2013?
1 year 10 months ago
What is the compresion ratio for this kit for a yz250f 2013? the yz250f 2013 has 13,5:1 stock
MotoSportExpert
Top 1 Contributor Top 50 Contributor
1 year 9 months ago
A: The ProCircuit High Compression Piston kit is listed for the 2010-2013 YZ250f as +1 point over stock and still allows you to run pump gas.
Crf250r
Location: Pa
Q: Will this piston work on my 2004 crf250r?
1 year 11 months ago
MotoSportGrantK
Expert MotoSport Staff Top 1 Contributor
1 year 11 months ago
A: Yes, just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct Pro Circuit High Compression Piston Kit for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Eddie
Location: New Jersey, USA
Q: 2013 rmz250 compression ratio?
2 years 4 months ago
What is the compression ratio to a 2013 Rmz250? I cant find it anywhere
MotoSportRyanT
MotoSport Staff Expert
2 years 4 months ago Location: Portland, OR, USA
A: The compression ratio on Pro Circuit High Compression Pistons would be 13.5:1.
troop
Location: minnesota
Q: Is it necessary to re-map my 2010 crf450r if I install this piston?
2 years 4 months ago
MotoSportRyanT
Expert MotoSport Staff
2 years 4 months ago Location: Portland, OR, USA
A: You should not need to Re-Jet your bike with this piston as long as your jetting is correct for your location (altitude/temperature) now. You should be safe to install the piston kit and run your bike then make adjustments from there. If your bike is currently jetted properly you should only need to make minor adjustments if any at all.
Holeshat
Location: Utah, USA
Q: What will the compression ratio be on a stock bore and stock head with this kit on a KX 450F 2009?
2 years 5 months ago
MotoSportRyanT
MotoSport Staff Expert
2 years 5 months ago Location: Portland, OR, USA
A: For the 2009 Kawasaki KX450F the compression ratio on this piston would be 13.5:1.
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