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Old Oct 14, 2010 | 04:19 PM
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compression tested

I've seen some faint black smoke coming out of both tail pipes (true dual) on from my 390 lately. I bought and did a compression test to it today, and it read just above 150psi for all cylinders. Is that good? And since they all read the same and aren't what you'd call low, i'm gonna assume i need to replace the valve stem seals then?
 
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Old Oct 14, 2010 | 04:28 PM
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Black smoke is fuel related, compression is great. Tune your carb, drive on.







John
 
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Old Oct 14, 2010 | 05:10 PM
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thanks good to hear!
 
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Old Oct 14, 2010 | 05:29 PM
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What kind of carb? Could well be a blown power valve which requires replacement. All it takes is one little back fire to blow one too. Compression is excellent.
 
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Old Oct 14, 2010 | 05:36 PM
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right now it's a edel 750 performer. It was taken apart about 2 weeks ago now and cleaned out, and that made a huge difference because it had a decent amount of what looked like "dirt" in both bowls. I don't know anything else about it though other than it runs haha. Something weird happens though every now and then, when i open the throttle all the way, the engine idles up and wont go back down till i restart it...
 
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Old Oct 14, 2010 | 05:49 PM
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Originally Posted by NW 150
right now it's a edel 750 performer. It was taken apart about 2 weeks ago now and cleaned out, and that made a huge difference because it had a decent amount of what looked like "dirt" in both bowls. I don't know anything else about it though other than it runs haha. Something weird happens though every now and then, when i open the throttle all the way, the engine idles up and wont go back down till i restart it...
The Edel doesn't have a power valve but the some of them have a tendency to have high float levels.
 
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Old Oct 14, 2010 | 06:15 PM
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The floats looked good and didnt have any gas in them, and looked to be where they should be.
 
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Old Oct 14, 2010 | 07:07 PM
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Originally Posted by NW 150
The floats looked good and didnt have any gas in them, and looked to be where they should be.
Either measure or you don't know.
 
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Old Oct 14, 2010 | 07:11 PM
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yea it's supposed to be i think 7/16? i shoudlve checked but i forgot to before putting it all back together, it looked good though, a half inch is pretty easy to gauge
 
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