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


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Old 12-22-2015, 01:46 PM
AZRickD AZRickD is offline
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Default 125+ Hours. Time for a top end job

In the middle of Arizona's race season and multiple Holiday's off, I decided it was time freshen up this 2011 EC250R. A Vertex piston from MotoCity.

This is my 3rd effort on a GG top-end (three on my 2005 EC250 back in 2011).

Any advice is appreciated.
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Old 12-22-2015, 03:33 PM
AZRickD AZRickD is offline
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Sticking with the A-cylinder.

The motor came out of the factory with a .5mm base gasket. I think I'll go with the .3mm.

With my RB head mod, the squish band measures at about 1.35mm as it sat with the .5 base gasket. I originally had it set at about 1.05mm with a .3mm.

The power valve looks too good for me to mess with it. Leaving it as is.

I am hoping that I don't install the PV linkage backward, somehow. Is that possible?
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Old 12-22-2015, 05:43 PM
AZRickD AZRickD is offline
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Piston pics.
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Old 12-22-2015, 07:34 PM
AZRickD AZRickD is offline
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Doing heat cycles.
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Old 12-23-2015, 12:17 AM
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Jakobi Jakobi is offline
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What jetting had you been running?
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Old 12-23-2015, 10:00 AM
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liv2day liv2day is offline
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Quote:
Originally Posted by AZRickD View Post
I am hoping that I don't install the PV linkage backward, somehow. Is that possible?
Hey Rick -

It sounds like you already have everything together, but for future reference, this was a huge help to me when I did the top end on my 200 for the very first time: http://www.gasgasrider.org/pv_disassembly_mattr.pdf

These two YT videos were instrumental as well; show the PV assembly on a GG300.

https://www.youtube.com/watch?v=hmz9cij6MVY

https://www.youtube.com/watch?v=FQJs2qM3rT8

Hope she runs like a beast and that new piston gives her lots of pull
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Old 12-23-2015, 10:10 AM
AZRickD AZRickD is offline
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Liv2Day, Thanks for the links.

Jakobi, I'm running a Lectron. I tend to run things fairly rich. Most riding in Phoenix is between 1K and 3K feet. I don't change anything when I go to Flagstaff (7K to 9K).

Bottom of the piston is barely discolored. Two small amber areas.

Time to do one more heat cycle this morning then I'll let her rip.
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Old 12-23-2015, 02:40 PM
AZRickD AZRickD is offline
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How's the heat and mixture ?
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Old 12-23-2015, 02:42 PM
AZRickD AZRickD is offline
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Piston top --
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Old 12-24-2015, 12:42 AM
GGRider01 GGRider01 is offline
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At least you can read the writing on the top of yours. I got my bike with the original piston in it.. 15 years after it came to the US. There was at least a 1/16th of an inch of carbon caked on the top. It had no carbon below the rings, interestingly. Washed perfectly clean and shiny like a mirror.. It was definitely overdue.
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