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2007 Kawasaki KX250F

Pro Circuit High Compression Piston Kit

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Product Description

The 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.
  • 4 - Valve stem seals.
  • 1 - Cam chain tensioner gasket.
  • 1 - Exhaust gasket.

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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4.9 out of 5 stars
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4 star   1
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1 star 0
cyclefun9480 Location: Carson City, Nv
Location: Lawrence, KS
1-10 of 11
Location: 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

Location: clermont fl

Great product

Ease of Installation
Location: Lincoln, CA
Worth while

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

Ease of Installation
Location: Staley, NC

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!

Ease of Installation
Location: alb new mexico
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
Ease of Installation
Location: Carson City, Nv
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.

Ease of Installation
Top 500 Contributor Top 1000 Contributor
Location: wewahitchka florida

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

Location: 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.

Top 10 Contributor
Location: 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.

Location: 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.

1-10 of 11
Total Questions (19)
Questions with answers:
Questions without answers:
Eddie Location: New Jersey, USA
1-10 of 19
Eddie 26 days ago Location: New Jersey, USA
2013 rmz250 compression ratio?
What is the compression ratio to a 2013 Rmz250? I cant find it anywhere
Expert MotoSport Staff
26 days ago Location: Portland, OR, USA
The compression ratio on Pro Circuit High Compression Pistons would be 13.5:1.
troop 1 month 2 days ago Location: minnesota
Is it necessary to re-map my 2010 crf450r if I install this piston?
Expert MotoSport Staff
1 month 1 day ago Location: Portland, OR, USA
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 2 months 22 days ago Location: Utah, USA
What will the compression ratio be on a stock bore and stock head with this kit on a KX 450F 2009?
Expert MotoSport Staff
2 months 22 days ago Location: Portland, OR, USA
For the 2009 Kawasaki KX450F the compression ratio on this piston would be 13.5:1.
Mpmullally23 Over 5 months ago Location: NY
What compression ratio is this piston? Thank you?
MotoSport Staff
Over 5 months ago Location: Portland, OR, USA
For the 2009 YZ450F this piston is 13.5:1.
crf25 Over 10 months ago Location: Kentucky, USA
Will this piston work with a hot rods stroker crank crf 450 2009 stock top end or will the compression be to much for stock top end?
MotoSport Staff
Over 10 months ago Location: Portland, OR, USA
Yes, you can run this piston in your 2009 CRF450r with the Hot Rod stroker crank. Even though it is a stroker motor the piston will not travel any farther up in the cylinder due to the shorter rod length so your compression will remain the same.
jlc15 Over 3 years ago
Will i need to rejet my carb to run this piston?
i have a 2008 yamaha yz 250 f
Expert MotoSport Staff
Over 3 years ago
whenever you change something with your engine you should check your jetting to make sure you not running to lean. a lean condition can cause damage to your engine.
motosno963 Over 4 years ago
High comp head?
do you need a high comp head to run the high comp piston?
Over 3 years ago Location: alb new mexico
i didnt have a pc head and i was able to run it!! strong power
cote222 Over 4 years ago Location: Arlington, WA
2nd question?
yeah so im already running twin air filters with no backfire screen, and have recently installed the JD jet kit (with impressive results), i don't want to mess with bore size due to racing standards. So im thinkin of saving for an exhaust system first and then hitting the engine part. Im willing to take the time to save up enough for the top of the line exhaust. Take in consideration ALL I DO IS RACE, both motocross and arenacross. so definately looking for a max performance exhaust ANY SUGGESTIONS?? Pro Circuit? Yoshi? Dr.D? FMF? Im up for any input thanks yeah ya!!!
MotoSport Staff
Over 4 years ago Location: P+RTLAND
I've only ran FMF and Pro Circ. and was more than happy with the performance boosts of both so my recommendations would either be the ti-4 by pro circuit or the 4.1 system by FMF. Hit some forums up with people that have the same bike as you and see what they are running.
Over 3 years ago Location: Mill Creek WV
Get an FMF 4.1C with a mega bomb header. I got one for my 09 YZ250F and the power increses were unbelivable.
cote222 Over 4 years ago Location: Arlington, WA
What to get?
Im a young racer with not a lot of cash looking for the best performance upgrades for my bike (Honda 07 Crf250R) been slowly customizing my bike over the last year. only stuff left is in the suspension and the motor/exhaust (the expensive stuff) I still want to get top of the line stuff but i don't know what to go for first, got a sponsorship for suspension (Pinnacle Racing) so that should be do able, but im stuck on what to tackle first for my engine and exhaust. Any suggestions?? thanks much Yeah Ya!!!
MotoSport Staff
Over 4 years ago Location: P+RTLAND
Start with your air filter, then hit the exhaust and jetting. If you still want more, you could run a big bore kit and possibly change out the cams.. The options are endless, but if you plan on using top of the line stuff, things are going to get pricey so just continue doing what your doing and knock it out piece by piece.
yam323 Over 4 years ago
What compression ratio?
ON a 2008 yamaha 250f compression is 13:1 what will this piston make it?
Top 250 Contributor
Over 4 years ago Location: California City, CA
After talking to pro circuit the only thing that they say is that it is +1 point so if your bike is a 13:1 than this is a 14:1. Also Pro Circuit doesnt make these pistons, JE makes these pistons, so if you buy a JE high compression piston it is exatly the same and a lot cheaper because you are not buy the procircuit logo.
1-10 of 19

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