2 stroke fouling plugs? - Page 2 - Diesel Truck Forum - TheDieselGarage.com
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post #11 of 14 (permalink) Old 04-02-2010, 03:54 AM
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Originally Posted by Kiddyextreme View Post
60:1 for the mix is perfect. I'm not sure how you are riding the bike, but any 2-stroke is not meant to be ridden at low rpm for a length of time.
It will run fine at 60/1 but you will wear the rod bearing and crank bearings quickly. 32/1 runs just as good and will give you longer crank life.
On fowling your plug, check filter and carb jetting.

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post #12 of 14 (permalink) Old 11-24-2012, 03:58 PM
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the one thing not mentioned here is the exhause may be blocked. it dont take much...but as they said clean filter and exhaust system...change fuel with GOOD quality 2 stroke oil and RUN IT LIKE YA STOLE IT...wide open...clean it out !
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post #13 of 14 (permalink) Old 11-24-2012, 04:01 PM
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also the older 2 strokes...in the 70s did foul plugs all the time
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post #14 of 14 (permalink) Old 11-24-2012, 07:19 PM
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I have a CR500 I trail rode all the time until I broke a case on it. It never once fouled a plug. I think I opened it wide open once in its entire life. Most of the time it was very low RPM putzing like a 4 stroke. I also ran 32:1 oil in it.

Because of this I discount the idea that the oil mixture has anything to do with it. I say there are two reasons it could be fouling. One is that the plug is not hot enough to burn off the oil. If you are into a slower style of riding then a hotter plug will sometimes be required. The down side is that at higher power output for longer periods of time, detonation (pinging) may occur and damage the engine if it is allowed to continue for a long time.

The other cause of fouling could be a rich gas/air ratio which might also cause poor running. If the engine had been set up right before, then I would not be thinking it is a mixture problem yet.
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