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Old 12-03-2012, 11:58 PM   #1 (permalink)
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Default Black Spark Plug

Ok, so for a little Christmas project this year I'm probably going to tear down my crf70. When I got it the plug was black and a little oily, so I changed the oil and put a new one in and adjusted the valves. It has a hard time starting in the cold (even at 60 degrees) so I checked the plug again and its black and oily again. Wondering if it is actually the rings before I start tearing into the engine. I probably need to clean the carb up so maybe that will help with the starting. After I put the new plug in earlier this year it would start up just fine even in the cold but after the oil and shit gets on the plug it can't really get a good enough spark, right?

If I have to do some engine stuff I would rather try it on this little 70 before I might have to do it on either of my bigger bikes. Part of why I got the thing was to screw around with it. Is there another way to tell if the rings are bad?
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All I'm saying is that our trannys are designed to handle the load (yea, I just said that)
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Old 12-04-2012, 12:07 AM   #2 (permalink)
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Leak down test
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Old 12-04-2012, 07:46 AM   #3 (permalink)
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you can get a compression gauge and measure you compression and record the numbers then drop about a table spoon worth of oil in each cylinder, wait about 30 sec. then check compression. If it significantly increases with the oil then your rings are bad. But if your tearing apart the motor I know personally I'd never tear into a motor without replacing piston rings and a bearings, so why not just replace them im sure even if it's got low hours it's still got some wear and a refresh is only going to give you more power.
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