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High compression piston questions?

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5280mx

Vital MX member 5280mx 61793 5280mx https://p.vitalmx.com/photos/users/61793/avatar/c50_MXmultiExposure1_1517274198.jpg?1517273377 https://www.vitalmx.com/community/5280mx,61793/all 01/29/18 3 9 133 1

Posts: 142

Joined: 1/29/2018

Location: Lakewood, CO USA

4/27/2018 5:36 PM

Hi fellow vitards, I am doing a top end on my 2013 crf450r. Have a couple questions, looking for some input.
If I install a high comp piston do I need to go to a higher volume oil sprayer? How much extra strain does that put in the rest of the motor? Lastly, will I need to run race fuel? Sorry for the dumb ?'s, but I am a vitard smile
Thanks in advance for any assistance!

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FGR01

Vital MX member FGR01 780 FGR01 https://p.vitalmx.com/photos/users/780/avatar/c50_6367_518576231496873_226911009_n_1388377791.jpg?1388377216 https://www.vitalmx.com/community/FGR01,780/all 10/01/06 41 10 https://www.vitalmx.com/community/FGR01,780/setup 59 3482 38 8

Posts: 3542

Joined: 10/1/2006

Location: AZ, USA

4/27/2018 10:37 PM

If the only change is the HC piston (assuming 13.5:1)you should be fine with stock oil sprayer and pump gas. A re-map is not a bad idea though. In my 2012 CRF450, it ran fine on pump gas with the 13.5 and a remap. When I added the stage-2 cam it started pinging so I went to 100 octane fuel.

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