Pro Circuit High Compression Piston

Pro Circuit High Compression Piston
Pro Circuit High Compression Piston

$249.99 - $341.99
10% Off - Save up to $38.00

Description See Also: 15 Reviews 13 Questions Fitment
Item #PRC001G

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15 Reviews
4.4 out of 5 stars
5 Star   11 4 Star   3 3 Star   1 2 Star   0 1 Star   1
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All Reviews
nickname Verified Purchaser
Ease of Installation 1/5 Performance 4/5 Power 4/5 Style 3/5
Pro Circuit Piston set.

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

yalobad Top 1000 Contributor
I am for UAE
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5

It give the bike high performance and acceleration to the bike

Rmzracer117
Johnstown, pa
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
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

j1tracy
Hermiston, OR
Durability 4/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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.

motomx
Massillon, OH
Durability 1/5 Ease of Installation 1/5 Performance 1/5 Power 1/5 Style 1/5
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.

TheJP
Cairo, NE
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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.

Larryc2010
Ease of Installation 5/5 Performance 3/5 Power 3/5 Style 5/5
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.

io094ikl
Atascadero, CA
Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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.

moto75 Top 25 Contributor
Cahttanooga tenn.
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Great Piston

This piston performs amazingly well in my 07 yz 250f

rider313
isanti, MN
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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.

NolanW33 Top 250 Contributor
Virginia Beach Virginia
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Very nice but..

Very nice piston. I do not think it is worth the money. A cheaper JE would have sufficed just fine. You are only paying for the name. Did exactly as any high comp piston would, more power all around.

mostoyzwinz Top 10 Contributor
CT
Not sure

put this in a '06 RMZ250 which seems to loose compression way too fast and burn oil. I'll give this product the benefit of the doubt because I believe the engine design is the main contributor to my problem.
Fit, finish, and dimensions (I measured them all) were spot on. They use stock Kawasaki rings I believe...watch out installing the cylinder, don't bend over the lower oil ring.

bigbird Top 250 Contributor
hammond, LA
High compression

this thing brings a bike to life

sotyphoon
baltimore maryland
Great piston!

Great quality piston works well and makes good power seems to be top quality.

RedRider188 Top 100 Contributor
pheonix az
Power

once you change to this piston you feel the power gain right away and improves the low end i think that it is the best for all around

13 Questions
Answered:   13
Not Yet:   0
kyle
Location: perth
Q: Does this package come with the coated wrist pin?
2 years ago
MotoSportExpert
Top 1 Contributor
2 years ago
A: No. Just a standard wrist pin.
shaneo173
Location: California, USA
Q: 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?
2 years 1 month ago
2014 crf250r torque and peak horsepower would be nice to
MotoSportExpert
Top 1 Contributor
2 years 1 month ago
A: 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
Location: Salt Lake City, UT, USA
Q: What is the compression ratio on crf150r?
2 years 1 month ago
I have had this piston for a while and it is amazing but I have always wondered what the compression ratio is.
MotoSportExpert
Top 1 Contributor
2 years 1 month ago
A: 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
Location: Montana, USA
Q: Can i use this product?
2 years 1 month ago
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
MotoSportExpert
Top 50 Contributor Top 1 Contributor
2 years 1 month ago
A: 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
Location: Grafton, ND 58237, USA
Q: What compression ratio does it bring a 2002 honda crf450r?
2 years 8 months ago
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.
MotoSportRyanT
MotoSport Staff Expert
2 years 8 months ago Location: Portland, OR, USA
A: This Pro Circuit Piston would be the same 13:1 compression ratio as the high compression piston you are running now.
aichokeu
Location: Coeur d'Alene, ID, USA
Q: If I am Installing a high comp piston for the first time, do I need the gaskets too?
Over 3 years ago
Also, can you run lower octane gas with this piston?
MotosportStaff
MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: 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.
jjjj
Top 1000 Contributor
Location: Buena Park, Ca.
Q: Your specs on this product specifically call-out pump gas not race gas. What is the correct answer?
Over 6 years ago
91 octane is the highest available pump gas in SoCal
Drewski
MotoSport Staff
Over 6 years ago Location: P+RTLAND
A: 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
rider313
Over 6 years ago Location: isanti, MN
A: this piston is designed to run off 91 octane gas. so you will be fine.
moto75
Top 25 Contributor
Over 6 years ago Location: Cahttanooga tenn.
A: 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
Location: Seal Beach, CA
Q: Is this simply a JE piston?
Over 6 years ago
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)
keify
Over 6 years ago Location: keify
A: 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
Location: novi, mi
Q: What is the compression ratio on these pistons?
Over 7 years ago
WnyRacing
Top 1000 Contributor
Over 6 years ago Location: Lockport NY
A: 13:1 is the compression ratio.
laptop
Q: Are the gaskets included or just the piston kit?
Over 7 years ago
JesseC
MotoSport Staff
Over 7 years ago Location: Tualatin
A: we do sell a combo with the gaskets but this exact one is just the piston kit.
moto75
Top 25 Contributor
Over 6 years ago Location: Cahttanooga tenn.
A: just piston kit
1-10 of 13
Fitment
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