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Pro Circuit High Compression Piston

$264.99 - $359.99
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Product Description

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.
  • Customer Reviews
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(15)
4.5 out of 5 stars
5 star   11
4 star   2
3 star   1
2 star 0
1 star   1
1-10 of 15
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Top 1000 Contributor
Location: I am for UAE

It give the bike high performance and acceleration to the bike

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Location: Johnstown, pa
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

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Location: Hermiston, OR
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.

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Location: Massillon, OH
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.

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Location: Cairo, NE
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.

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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.

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Location: Atascadero, CA
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.

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Top 25 Contributor
Location: Cahttanooga tenn.
Great Piston

This piston performs amazingly well in my 07 yz 250f

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Location: isanti, MN
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.

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Top 250 Contributor
Location: Virginia Beach Virginia
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.

1-10 of 15
Total Questions (9)
Questions with answers:
  9
Questions without answers:
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1-9 of 9
mxrider65 27 days 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
26 days ago Location: Portland, OR, USA
This Pro Circuit Piston would be the same 13:1 compression ratio as the high compression piston you are running now.
aichokeu 1 year 1 month 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
1 year 1 month ago Location: Portland, OR, USA
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 3 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 3 years ago Location: P+RTLAND
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 3 years ago Location: isanti, MN
this piston is designed to run off 91 octane gas. so you will be fine.
Top 25 Contributor
Over 3 years ago Location: Cahttanooga tenn.
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 4 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 4 years ago Location: 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 4 years ago Location: novi, mi
What is the compression ratio on these pistons?
Top 1000 Contributor
Over 4 years ago Location: Lockport NY
13:1 is the compression ratio.
laptop Over 4 years ago
Are the gaskets included or just the piston kit?
MotoSport Staff
Over 4 years ago Location: Tualatin
we do sell a combo with the gaskets but this exact one is just the piston kit.
Top 25 Contributor
Over 3 years ago Location: Cahttanooga tenn.
just piston kit
nanu Over 5 years ago
Do you have to rejet your nike for running this piston?
and if so what jets to you recomend using?
Expert MotoSport Staff
Over 5 years ago
You shouldn't have to rejet the bike. If you are wanting to get jetting specs, you may contact Pro Circuit and get their advice. We won't give jetting recommendations at MotoSport.com.
Top 100 Contributor
Dill Over 5 years ago Location: East Quogue, NY
Do u have to run race gas if you higher the compression?
Expert MotoSport Staff
Over 5 years ago
Yes. If you decide to go with a high-compression piston kit, then you will have to change up the gas that you run in your bike. I'd personally recommend just running a 50/50 blend of 110 race gas and supreme (93 and 110 mixed). In my opinion, this will get you the best results out of your motor and it won't be nearly as expensive as running a straight race gas. With that said, there are plenty of people out there that would argue running straight 110 and 110 only, but I (and most others, for that matter) feel that straight 110 is a bit overkill (too expensive and no actual performance gain can be felt over running a 50/50 blend).
Top 25 Contributor
Over 3 years ago Location: Cahttanooga tenn.
it helps prevent bog
alan Over 5 years ago Location: hawaii
What is the actual compression ratio of the pro circut high compression piston for an 05 rmz 450?
MotoSport Staff Expert
Over 5 years ago
We have tried numerous times contacting Pro Circuit to get this question answered. They don't seem to know, or they don't want to disclose that information.
Over 5 years ago
PRO CIRCUIT PISTONS ARE 13:1
1-9 of 9

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