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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.

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Old 01-11-2019, 12:50 PM
roverhybrids roverhybrids is offline
Senior Member
Join Date: Mar 2011
Location: Redding, CA
Posts: 358
Default Head mod squish adjustment machining USA

Can I get a recommendation for someone in the US to modify the stock head?
I used rb-designs for another gasgas, but he is retired.
It is for an ec200

2011 GasGas ec300R
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Old 01-11-2019, 01:12 PM
Wimpy525 Wimpy525 is offline
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Join Date: Oct 2011
Location: Catawissa Pa
Posts: 378

RK-TEK my new head for my GP just showed up today in the mail! Hoping to get some testing done this weekend.
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Old 01-11-2019, 02:51 PM
thumperrider1 thumperrider1 is offline
Senior Member
Join Date: Sep 2010
Location: VA
Posts: 499

I went with an RK-TEK head as well on my 18 300. The bike runs much better with it now. Before it was a little finicky with jetting and had some slight detonation here and there. The bike sounds different now. Super crisp.

I don't have the CDI remap done yet but plan to get it done. It feels like it added a little boost from bottom to top. I can run third where I used to downshift to 2nd. It revs out better now as well.
2018 XC300
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Old 01-11-2019, 03:54 PM
Moto7man Moto7man is offline
Join Date: Aug 2011
Location: Murfreesboro,Tennessee
Posts: 2,159

I just got my 84 RM 250 head back from Pro-Circuit, it looks awesome but I have not reassembled my engine yet.
2011 GG EC 300E, 1994 CR 250R and 1984 RM 250 E

"If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut."
―Comedian Lewis Black
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