Pro Circuit High Compression Piston

$279.99 - $379.99
$249.99 - $341.99
4.40 out of 5 stars
 
Pro Circuit High Compression Piston
Pro Circuit High Compression Piston
  • Description
  • Reviews (16)
  • Q&A (13)
  • Fitment

Important Note: This piston is for a stock sized bore. Please measure your cylinder to check clearance before ordering.

By using a Pro Circuit high-compression piston you will gain both low-end torque and top-end power. High-compression pistons work equally well on stock or modified motors with the same results, more power at every RPM.

  • 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, (un-coated) wrist pin, and circlips.
4.4 out of 5 stars (16)
4.4 out of 5 stars
5 star   11
4 star   3
3 star   1
2 star 0
1 star   1
See Terms and Conditions
1-10 of 16
Overall 4 out of 5 stars
Ease of Installation
Performance
Power
Style
Verified Purchaser
nickname
Pro Circuit Piston set.

JD piston, and pin, with OEM Kawasaki rings, packaged as Pro Circuit piston kit! Not what I expected.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 1000 Contributor
Location: I am for UAE
yalobad

It give the bike high performance and acceleration to the bike

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Johnstown, pa
Rmzracer117
Good equality

It was easy to install and once u run it my 08 rmz250 had a little more power than it did before and it changes te sound of ur bike to while if u ask me my bike sounds alot better now

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Hermiston, OR
j1tracy
08 RMZ 450

I installed this kit in my 08 RMZ450 along with new Faction MX intake valves. The bike has more power all through the range, starts easier and I can ride the bike a gear taller in all situations. Great product that I would highly recommend.

Overall 1 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Massillon, OH
motomx
DONT BUY

Don't buy this! I bought this for my 2010 yz250f and I got the JE piston and the stock rings for it. The stock rings do not fit this piston. The JE piston is a two ring set up and the stock piston is a 3 ring set up so you cannot use the stock rings for it.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Cairo, NE
TheJP
GREAT PART

I put this piston in my old crf 450 (05) and noticed a good improvement over the stock piston. a day after i put it in though, i threw a keeper out of my right exhaust valve - my fault the valves were shot. installed kibblewhite valves and springs. torque was incredible- almost tractor-like. with an exhaust as the only other motor mod, it was good enough to win me a trophy at the sand drags- 5 bike lengths on a cr500. definately worth the money and cheaper than a full exhaust system.

Overall 3 out of 5 stars
Ease of Installation
Performance
Power
Style
Larryc2010
Simple

After installing this piston and riding one day, I couldnt feel much of a difference. It may be from me rejetting my bike incorrectly at the same time however. piston looks great and easy to install. just make sure you dont drop any piece into the crank case or lose any pieces.

Overall 5 out of 5 stars
Ease of Installation
Performance
Power
Style
Location: Atascadero, CA
io094ikl
Awesome

I installed this piston in an 07 RMZ-250 after I just put an OE piston in 2 months earlier. Only did it to try and get more power (more of an experiment than anything). This Piston absolutely rocks, it has more power more torque, amazingly its easier to use the power thats there too. Installation was the same as any piston but the PC piston slid into the cylinder easier than the OE I thought. I have zero complaints on it. I am running supreme pump gas and it works great no pinging or misfiring. I did not mark any stars for durability because I only has a month or so of riding on it, however it seems to be just fine. For the tech guys when I measured the stock piston before installation it was 76.96mm and the PC piston was 76.98.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 25 Contributor
Location: Cahttanooga tenn.
moto75
Great Piston

This piston performs amazingly well in my 07 yz 250f

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: isanti, MN
rider313
Good pistion kit

i bought this when my stock piston was due for a swap on my yz250f. the motor revs more freely. it pulls alot harder than stock also. this will be the only kit i will buy from here on out.

1-10 of 16
Total Questions (13)
Questions with answers:
  13
Questions without answers:
0
JD22 Location: Montana, USA
1-10 of 13
kyle Over 9 months ago Location: perth
Does this package come with the coated wrist pin?
Top 1 Contributor
Over 9 months ago
MotoSportExpert
No. Just a standard wrist pin.
shaneo173 Over 10 months ago Location: California, USA
How much low to mid hp would u gain in conjuction to a single side fmf factory 4.1 w/ mega bomb and stage 2 camshaft from hot cams? straight 93?
2014 crf250r torque and peak horsepower would be nice to
Top 1 Contributor
Over 9 months ago
MotoSportExpert
The internal combustion engine is very simply put a basic air pump. The more air/fuel you and intake and exhaust from the motor, the more power you will make. HP gains are very subjective to gauge on any one or combination of performance parts. Things like the age of the motor, the tune of the air fuel ratio, the altitude, etc will all have an effect on PEAK HP numbers. Many performance products will not increase your PEAK HP, but rather move the HP to a different RPM range than the stock motor.
Enduro8expert Over 10 months ago Location: Salt Lake City, UT, USA
What is the compression ratio on crf150r?
I have had this piston for a while and it is amazing but I have always wondered what the compression ratio is.
Top 1 Contributor
Over 10 months ago
MotoSportExpert
Pro Circuit list the compression as +1 point and still able to use premium pump gas. They do NOT release the exact compression ratio on their pistons.
JD22 Over 10 months ago Location: Montana, USA
Can i use this product?
can i use this high compression piston along with both my intake and exhaust hot cams? and will i still notice a difference in power an performance? i have a 2006 yz250f
Top 50 Contributor Top 1 Contributor
Over 10 months ago
MotoSportExpert
A Pro Circuit High compression piston will give you more bottom end power. It will work with other modifications such as the Hot cams, porting and exhaust. You will have to rejet the 2006 Yamaha YZ250F bike for the modifcations and we have products to help you with that.
mxrider65 1 year 5 months ago Location: Grafton, ND 58237, USA
What compression ratio does it bring a 2002 honda crf450r?
I have a 2002 Honda crf450r and right now I have a 13:1 high comp piston in it and I was wondering what the compression ratio was on this piston.
MotoSport Staff Expert
1 year 5 months ago Location: Portland, OR, USA
MotoSportRyanT
This Pro Circuit Piston would be the same 13:1 compression ratio as the high compression piston you are running now.
aichokeu 2 years 5 months ago Location: Coeur d'Alene, ID, USA
If I am Installing a high comp piston for the first time, do I need the gaskets too?
Also, can you run lower octane gas with this piston?
MotoSport Staff
2 years 5 months ago Location: Portland, OR, USA
MotosportStaff
Yes, you will definitely need a new gasket kit if installing this piston. Also, depending on how many hours are on the engine it would be a good idea to replace the bottom end at the same time. The higher compression piston is harder on the crankshaft than the stock OEM setup. You will want to run higher octane fuel than required for the stock compression for the bike to run properly without damage. Mixing premium pump gas 50/50 with race fuel is a safe medium.
Top 1000 Contributor
jjjj Over 5 years ago Location: Buena Park, Ca.
Your specs on this product specifically call-out pump gas not race gas. What is the correct answer?
91 octane is the highest available pump gas in SoCal
MotoSport Staff
Over 5 years ago Location: P+RTLAND
Drewski
The description is saying that you can use either premium pump fuel or race fuel. Obviously you will get more of a boost out of race fuel, but premium pump gas (91-93 octane) will be fine
Over 5 years ago Location: isanti, MN
rider313
this piston is designed to run off 91 octane gas. so you will be fine.
Top 25 Contributor
Over 5 years ago Location: Cahttanooga tenn.
moto75
the lowest i run is 93 in the summer and 103 in the winter, itll bog without that set up. you can always use 91 with octane boost
amr126 Over 5 years ago Location: Seal Beach, CA
Is this simply a JE piston?
To what I understand JE pistons makes the pistons for pro circuit. They offer 12.8:1 and 13.5:1 compression for the YZ 450F, so which one is it? (don't say 13:1)
Over 5 years ago Location: keify
keify
we use the 13:5 cr on our yz 450s more bottem bark and no loss of upper end. most 250fs come stock now with high\er c.r. most 450s do also
keepitpinned529 Over 5 years ago Location: novi, mi
What is the compression ratio on these pistons?
Top 1000 Contributor
Over 5 years ago Location: Lockport NY
WnyRacing
13:1 is the compression ratio.
laptop Over 5 years ago
Are the gaskets included or just the piston kit?
MotoSport Staff
Over 5 years ago Location: Tualatin
JesseC
we do sell a combo with the gaskets but this exact one is just the piston kit.
Top 25 Contributor
Over 5 years ago Location: Cahttanooga tenn.
moto75
just piston kit
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