Hi,
im in the process of changing the Piston on my 300, and was wondering how high i can go with the compression and how low with the squish clearance? On my 250 TM i was running 1.3mm, but going down 0.7mm seems quiet excessive. I could open up the chamber on my lathe, but i would really perfer to leave that alone and just reduce the squish. What are you guys running? I also want to keep the stock head, so no aftermarked stuff. Im looking for some more grunt out of tight corners, but i dont want to loose top end.
-Moritz
RR 300 2018 Head mod
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RR 300 2018 Head mod
by Mo_RR » Tue Apr 07, 2020 2:42 am
- Mo_RR
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Re: RR 300 2018 Head mod
by NW_250RR » Tue Apr 07, 2020 4:12 pm
I had my 250RR head cut from 1.8mm to 1.2mm. Runs great. Definitely cleaned up the jetting and made it more tolerant.
- NW_250RR
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Re: RR 300 2018 Head mod
by Mo_RR » Wed Apr 08, 2020 1:09 am
NW_250RR wrote:I had my 250RR head cut from 1.8mm to 1.2mm. Runs great. Definitely cleaned up the jetting and made it more tolerant.
Did you correct the compression Ratio or just cut down on the squish?
- Mo_RR
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Re: RR 300 2018 Head mod
by NW_250RR » Fri Apr 10, 2020 11:24 am
Mo_RR wrote:NW_250RR wrote:I had my 250RR head cut from 1.8mm to 1.2mm. Runs great. Definitely cleaned up the jetting and made it more tolerant.
Did you correct the compression Ratio or just cut down on the squish?
Only the squish was cut. Nothing done to the chamber.
- NW_250RR
- Posts: 91
- Joined: Sat May 13, 2017 1:03 pm
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