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Fouling Spark plug

 
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taro
Net Rider


Joined: 12 Apr 2011
Location: Wilmington, DE

PostPosted: Wed Apr 20, 2011 2:47 pm    Post subject: Fouling Spark plug Reply with quote

Something is causing my spark plug to foul up.
It worked long enough for my boyfriend to drive it to and from a hardware store a mile away, but now it only runs off and on.

We get good spark, and we've cleaned the ignition points, but for some reason, the plug keeps fouling and we don't really know why.

Anybody?
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mountainmoped
Master Regional Rider


Joined: 14 Nov 2003
Location: Northern Georgia

PostPosted: Wed Apr 20, 2011 5:11 pm    Post subject: re: Fouling Spark plug Reply with quote

Too much oil if premix or stuck float in carb, or stuck open check valve in oil injection system.
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John
Master Regional Rider


Joined: 18 Nov 2003
Location: Caledonia, Ontario, Canada

PostPosted: Wed Apr 20, 2011 5:13 pm    Post subject: re: Fouling Spark plug Reply with quote

What is your fuel ratio? What moped is it? What heat range/number of plug are you using? Any modifications? What jet do you have in the carb? Muffler coked up? Compression? Choke sticking on? Haha, must be some more, but I am at a loss right now.
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"Plan your life like you will live forever, and live your life like you will die the next day!"
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taro
Net Rider


Joined: 12 Apr 2011
Location: Wilmington, DE

PostPosted: Wed Apr 20, 2011 10:24 pm    Post subject: re: Fouling Spark plug Reply with quote

It's running!

Tonight... That's more than I can say for the past couple of days!

We'll see how long for. More extensive tests tomorrow. I cleaned off the spark plug again, and we emptied out the fuel (which looked like it had very little to no oil in it) and replaced it with a fresh mix. (which is really something we should have done earlier) It started right up twice in a row for two rides around the block without stalling. Smile

It is a General 5 Star ST with a Minarelli motor that takes a 40:1 mix. It's currently a new Champion L86C spark plug. I checked it after my two laps and it was dirty again, but not wet and covered in grime this time.

There aren't any modifications and the choke isn't sticking, it's definitely popping up when I give it full throttle. I really don't know about compression, though.

If I have problems with it again tomorrow, I'll definitely have to check the rest of those things that you two suggested. Thanks!
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52DLegend
Net Rider


Joined: 18 Apr 2011
Location: midland,michigan

PostPosted: Fri May 20, 2011 11:57 pm    Post subject: re: Fouling Spark plug Reply with quote

i assume this bike you may want to decarbbon the head and get a bottle of decarbbonizer from your local dealer (mix via bottle instructions) mix the heavy carb mix (2oz per gal) for first tank and run the lighter mix (1oz per gal) next 2 tanks then treat every other tank with lite mix to keep clean.
it perked up my honda with about 8k on it.

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