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Old 06-17-2006, 07:02 PM   #1
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My Fuji's exhaust is really black black

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This is actually my first gas, bought the Fuji 54 from a fellow club member, spent the whole month farting around with it, finally got it running just now, but the exhaust is like dirty black.

Here's the configuration:

No lead regular gas
LawnBoy Ashless 32:1 oil
Master Airscrew 18x8

I guess that's it, it runs fine, scared the day light out of me because I thoguht it was going to take off even though I have it ancohored to a very sturdy builtt test stand, didn't have the gall to leave it running and run back to the house for the tack. I will take a reading tomorrow when I am ready for another run.

Anyway, I ran my grass trimmer with no black residues and very clean, that is the first reason why people switched to gas at the first place, but with this, I don't know, what is your thought? Should I switch to symthetic oil instead?


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Old 06-17-2006, 09:53 PM   #2
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Many new gas engines, when they are breaking in (especially with the non synthetic oil) will have black crap coming out of the exhaust until they get broken in. This should go away over time, assuming it's not running too rich. I would also pull the plug out and inspect will tell you if it's running rich or lean.
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Old 06-18-2006, 01:35 AM   #3
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Shot in the dark, but could a muffler or baffle(if they are even used???) be loose?
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Old 06-18-2006, 07:25 AM   #4
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the weed wacker converted will give ya some black goo as well its not running as hot with a big prop blowing air across the cylinder is my guess.i used optimal till i cant find it here it is synthetic gives ya about 80-1 and still some goo not a lot but ya gotta clean some
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Old 06-18-2006, 12:48 PM   #5
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Ran again this morning

Took a brief reading (couldn't prolong the full power for too long, just too dangerous for me single handedly, the wife will have nothing to do with anything that stupid).

It registered 7800 rpm with the Master Airscrew Classic, how this compares relatively to other makes?

I think the gook was a little less this morning, so, thanks to all the advice, it is going to run fine.

Question: what sort of a plane this will be good for, the engine with the cdi, muffler, 2300 mAh 4-cell pack weighs just under 5lbs.

I hope with times, it will develope another couple of hundreds rpm?

Thank you guys,

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Old 07-27-2006, 10:08 AM   #6
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Black exhaust

Try running using premium gas instead of regular mix. Some people have noted that when using premium it cuts down on the black coming out the exhaust. For the amount of gas you are going to use it will not break the bank.
Worth a try.
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