Black Smoke
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Tourer
Joined: Oct 2007
Posts: 269
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Black Smoke
My 78 was puffing some white smoke. I went to the guy that built the motor and he told me it might be running rich so I leaned it out a little and white smoke went away now when I give it the throttle it puffs a little black smoke . It is a stock 78 with a bendix carb and short pipes with no baffles and a lollipop. It seems to run great no hesitatation when I go up thru thew gears. The plugs look good. Oh ya I do run 100 octane in it as well. So is everything as it should be or is the back smoke the sign of an issue?
Thanks
T-Ron
Thanks
T-Ron
Cruiser
Joined: Feb 2008
Posts: 118
Likes: 0
From: Athens, GA
I think the white smoke is probably moisture (steam) or blue smoke (oil) that looks white in small amounts. Black smoke is fuel (rich) and is probably related to the accelerator pump.
Ideally, you want the air/fuel ratio correct... I would be concerned over running it too lean and would rather be on the rich side, for safetys sake. If you aren't fouling plugs, it probably isn't a big issue.
Ideally, you want the air/fuel ratio correct... I would be concerned over running it too lean and would rather be on the rich side, for safetys sake. If you aren't fouling plugs, it probably isn't a big issue.
Cruiser
Joined: Jan 2010
Posts: 112
Likes: 0
From: Chicago, IL
My 78 was puffing some white smoke. I went to the guy that built the motor and he told me it might be running rich so I leaned it out a little and white smoke went away now when I give it the throttle it puffs a little black smoke . It is a stock 78 with a bendix carb and short pipes with no baffles and a lollipop. It seems to run great no hesitatation when I go up thru thew gears. The plugs look good. Oh ya I do run 100 octane in it as well. So is everything as it should be or is the back smoke the sign of an issue?
Thanks
T-Ron
Thanks
T-Ron
Advanced
Joined: Aug 2010
Posts: 89
Likes: 0
From: Western PA
yah, i ditched mine and did the cv conversion....its a totally different bike now.
Road Captain
Joined: Oct 2010
Posts: 566
Likes: 3
From: rural ontario
I have a Bendix on mine...the old style that isn't adjustable. I have no complaints with it. At times it just makes the ride more interesting...found myself changing the Main on the side of the road on a mountain pass in BC a couple of times....but that just added to the stories I get to tell...
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Tourer
Joined: Jul 2009
Posts: 481
Likes: 2
From: Minnesota
I have a Bendix on mine...the old style that isn't adjustable. I have no complaints with it. At times it just makes the ride more interesting...found myself changing the Main on the side of the road on a mountain pass in BC a couple of times....but that just added to the stories I get to tell...
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Road Captain
Joined: Oct 2010
Posts: 566
Likes: 3
From: rural ontario
Yup, It was starting to run a little thick. I had to drop two jets going up...one at a time...and restore them down the other side and into Vancouver.
Tractor-trailers of lumber going down the mountains added to the excitement of road-side tuning.
s
Tractor-trailers of lumber going down the mountains added to the excitement of road-side tuning.
s
Road Captain
Joined: Oct 2010
Posts: 566
Likes: 3
From: rural ontario
s