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


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Old 11-22-2020, 11:23 PM
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Default Case Port Matching

I am freshening the bottom end of my 2000 XC327, with a crank rebuild and new main bearings. I figure it may be worth doing some case cleanup while I have it apart. Does anyone have experience with cleaning up the GG cases for better flow/performance and is it worth it? If so, can you share some details.

The case transfer port areas are pretty rough and floor of the reed cage is uneven. I hear that it is bad to remove too much material from the cases because it increases volume and reduces the compression in the lower end of the engine. I started putting some Sharpie marks where I thought I would do some grinding and smoothing.

Any input would be welcome.
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Old 11-23-2020, 12:24 AM
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It might keep you amused but you won't feel anything more than placebo. What is more likely to yield a small result is the sharp edge at the transfer to bore.

But you cant do that without risking the plating, so it's a replate time exercise.

On race engines I've cleaned things up, just because, but . . .
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Old 11-23-2020, 07:45 PM
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I always match the cylinder to the cases using the base gasket as my template for both. Inside the cases and cylinder I will only remove casting flash, larger bumps, and grind down edges where the cases halves meet but that's it. Anymore than that and you really can affect the flow through the engine and not always in a good way. Like F5 said, more than likely placebo but my engines have always run strong.
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Old 11-23-2020, 09:19 PM
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Thank you both for the input. I will probably spend a little time "cleaning and smoothing" before I put her back together. I am building a 1999/2000 GG mostly from spare parts so I will not have a before and after comparison. I had a 250 top end that needed a replate so for a few dollars more I am doing a big bore 265cc. It should be fun when I am finished.
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Old 11-24-2020, 12:29 AM
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Is it a counterbalanced engine? If so, when you're done do report!

Jeff
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Old 11-24-2020, 08:14 AM
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This one is not counterbalanced but we have two 1998 EC250 unicorns in our riding group. They are amazingly smooth and linear.
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