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2009 Yamaha YFZ450R

GYTR High Compression Piston

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FITS: 2009 Yamaha YFZ450R change
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GYTR High Compression Piston

Product Description

  • Forged aluminum construction that is CNC machined to exact tolerances for performance and durability.
  • Raises compression ratio for a performance boost throughout the rpm range.
  • 2-ring design has less drag than 3-ring design resulting in additional horsepower.
  • Machined valve pockets provide additional valve clearance when used with higher lift camshafts.
  • Kit includes piston, piston rings, piston pin, and clips.
  • Requires 100 octane race gas.
  • Raises compression ratio to 13.5:1.
  • Uses stock rings, pin, and clips for convenience.
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Verified Purchaser
Best Purchase Ever

best performance part for my quad

Ease of Installation
Location: Mill Creek WV
A Must Have

Just put this in my 2009 YZ250F an right after I got the bike back together and running I could tell a huge difference in the power. It almost threw me off the back because I wasn't expecting my bike to accelerate that much faster. The only down side is the higher cost of the gasoline you have to run, but if your serious about racing this is a must have!

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Total Questions (3)
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Zach3445 2 months 27 days ago Location: O'Neill, NE 68763, USA
Dont these require high compression Gytr Gaskets?
I need to replace the gaskets around my cylinder while I'm In my motor and I Thought these required a high compression GYTR gasket set and i can not seem to find it on the site. I cant find any gaskets that fit the stock Bore. they are all for big bore kits. Im shopping for my 2009 YFZ450R fuel injected model.
Expert MotoSport Staff
2 months 23 days ago Location: Portland, OR, USA
You should be able to use the OEM gasket kit or any aftermarket gasket kit with this piston. I cannot find anything on this kit that says it would require a specific gasket kit for the higher compression.
Tupadre Over 10 months ago
Could I run 91 octane gas?
MotoSport Staff
Over 10 months ago Location: Portland, OR, USA
Yamaha recommends running 100 octane fuel with this piston kit. You can mix a 110 race fuel 50/50 with your 91 octane and be okay. Basically compression ratios between 12.5 and 13.1 will start to require 100 octane. If it is not used then your motor can start to pre-detonate during the compression stroke which can cause pre-mature engine wear, and can lead to piston failure.
absolutbaikel Over 12 months ago Location: Chile
What happens if I use regular 97 octane gas with this piston kit in my yfz450r?
GAS cuestion
MotoSport Staff
Over 12 months ago Location: Portland, OR, USA
Your YFZ450R with this piston kit installed should run just fine with 97 octane fuel.
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