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


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  #11  
Old 04-29-2020, 03:11 AM
Doc Brown Doc Brown is offline
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Quote:
Originally Posted by Undertow View Post
For GP300 -18, I switched from stock head to S3 and high comp insert (the medium one that came with the head).

Stock head had wayyy too much compression. Pinged every time I closed the throttle. S3 head made it a lot smoother to ride with nice fuel economy.
Another strange thing. Must be a quality issue, none of my 2019's (both 300's) pinged on deceleration...


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  #12  
Old 05-08-2020, 03:26 AM
taylor146 taylor146 is offline
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Hi, I suffered from decel ping/ knock on my 2018 300 that I couldn't seem to jet out. Checked the comp ratio and it was 13.85:1 std. With high sqish. Fitted the S3 head with highest comp black insert which reduces comp to 13:1 with reduced squish which cured my running problems. I have been told that the std 19 head is lower comp STD. I'm in the UK and suspect that different fuels across the world will have different effects .
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Old 06-04-2020, 12:14 PM
Doc Brown Doc Brown is offline
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Originally Posted by taylor146 View Post
I have been told that the std 19 head is lower comp STD. I'm in the UK and suspect that different fuels across the world will have different effects .
That's indeed interesting. I only heard that the EC 300/19 head is different vs the EC300/18 head.

Fuels are high quality over here, I can run 95 which we call "super", 98 "super plus" and 101 "power". The latter one is incredibly expensive so I don't use it.

Has anyone with a EC300 tried the cylinder head of the GP model? Allegedly it should be "better" whatever that means....
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