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The GYTR High Compression Piston Kit provides a performance boost throughout the RPM range while maintaining a high level of durability.
Forged aluminum construction that is CNC machined to exact tolerances for performance and durability.
Machined valve pockets provide additional valve clearance when used with higher lift camshafts.
The kit includes piston, piston rings, piston pin, and clips (uses stock replacements).
Notes: Requires use of minimum 100-octane racing fuel. This accessory may be restricted to closed-course use. This performance accessory does not meet California standards for off-road recreational vehicle usage regardless of model year. IMPORTANT: GYTR Oil Sprayer (sold separately) is required for GYTR High Compression Piston Kit.
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!
Can i use 98octane insted of 100octane?
And how much hp can I expect to gain on my 2013 yz250f?
Top 1 ContributorTop 50 Contributor
1 year 1 month ago
It is always recommended to use Premium fuel with a GYTR or any other brand High Compression Piston. Depending on the compression ratio and other factors, you may need to use a mix of race gas to eliminate detonation.
As a general rule of thumb, a higher compression piston will give you more low end power in trade for higher RPM power.
Zach34451 year 10 months agoLocation: 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.
1 year 10 months agoLocation: 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.
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.