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Discussion Starter · #1 ·
maybe y'all can help. i have 650 triumph tiger - single carb, boyer ignition and 6v coils. without fail, i seem to foul the plug on #2 every time i ride it. i've tried cooler plugs and hotter ones..... same result. it doesn't smoke/ burn oil and is timed right. my only guess is that it's valve related since it's a single carb bike and #1 is just fine. any ideas / suggestions?
 

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compression, then leak down test. this will give you a idea if there is a cylinder problem...if they are balanced it may help point into the direction of a valve or head (behind valve) problem...possible guide.
..just make sure you have the front wheel against the wall before you do the leak down test.....
 

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Discussion Starter · #4 ·
thanks fellas. much appreciated. i know how to conduct a compression test, but what exactly is a "leak down" test?
 

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Bad rings or bad guides (or both!).
 

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before you pull the head off, it could be something as simple as a bad plug wire, just for fun switch the wires and see if it moves the problem
 
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