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


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Old 09-25-2018, 07:47 PM
Wypipo Wypipo is offline
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Default Spark plug and piston after 8 hours

I know it?s pretty early but I just put an RK tek head in so had everything apart so I figured I?d take some pictures and get opinions...I don?t have a ton of experience. I broke the bike in proper for the first 5 hours. About the 6 hours in I was riding through a recent forest fire and was in about of foot of thick wet ash for a good hour. The bike started to overheat so i let it cool down and everything was good after that. I did lose a little bit of coolant from overheating, maybe 4 ounces or so. Here is a picture of the top of the piston and the spark plug.
Picture of the piston before and after cleaning with a rag and the underside of the head
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Old 09-25-2018, 07:49 PM
Wypipo Wypipo is offline
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And the spark plug before and after cleaning
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Old 09-25-2018, 07:58 PM
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(F5) (F5) is offline
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Default

I could conclude all sorts of things from those pictures but I'd be fooling myself.
The only way to do it is a very long straight flat out in top sustained then pull the clutch cut engine coast to stop then open it up. That will tell you about the mainjet size.

Not a hugely useful tuning method on a dirt bike. Essential on roadrace bike until egt meters made that redundant mostly.
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