Runs after turned off and smokes!
#1
05-13-2008, 08:38 AM
Runs after turned off and smokes!
This has happened about 4 times now and kind of worries me. Sometimes after riding for a while (45min or so) I park the bike and flip the switch to Off. Most of the time she'll cut right off like a good girl and I'm happy. Now I get a little upset when she doesn't act like she's supposed to, sputtering and coughing when I hit the Off switch. This sputter/cough only lasts for a few seconds and is followed by a puff of smoke coming somewhere from the engine area.
I haven't rejetted the carb yet (waiting on one jet) and I have Samson exhaust w/out baffels. Not sure if this info is relevant but it may be.
Anyone know what disease my girl has?
I haven't rejetted the carb yet (waiting on one jet) and I have Samson exhaust w/out baffels. Not sure if this info is relevant but it may be.
Anyone know what disease my girl has?
#3
05-13-2008, 09:01 AM
RE: Runs after turned off and smokes!
Your problem is commonly called dieseling.
First, the smoke you are seeing is the result of a backfire through the carb. with the smoke coming out of the air filter. The backfire is caused by the dieseling.
Dieseling can be caused by several things, the first of which is too low an octane gas. This often gets worse as the weather gets hotter. If you are running 87 octane, you might try using a few tanks of 89 and see if it doesn't eliminate the issue. You could also try switching to another Name Brand gas like Shell, Chevron, Sunoco, Texaco.
Carbon buildup on the cylinder heads can also cause dieseling. You could try cleaning it by injecting Seafoam directly into the carb. throat. The instruction for doing this are on the back of the can.
Note: going to larger jets, will if anything, make the dieseling worse, not better.
First, the smoke you are seeing is the result of a backfire through the carb. with the smoke coming out of the air filter. The backfire is caused by the dieseling.
Dieseling can be caused by several things, the first of which is too low an octane gas. This often gets worse as the weather gets hotter. If you are running 87 octane, you might try using a few tanks of 89 and see if it doesn't eliminate the issue. You could also try switching to another Name Brand gas like Shell, Chevron, Sunoco, Texaco.
Carbon buildup on the cylinder heads can also cause dieseling. You could try cleaning it by injecting Seafoam directly into the carb. throat. The instruction for doing this are on the back of the can.
Note: going to larger jets, will if anything, make the dieseling worse, not better.
#4
05-13-2008, 09:21 AM
RE: Runs after turned off and smokes!
ORIGINAL: cHarley
Your problem is commonly called dieseling.
First, the smoke you are seeing is the result of a backfire through the carb. with the smoke coming out of the air filter. The backfire is caused by the dieseling.
Dieseling can be caused by several things, the first of which is too low an octane gas. This often gets worse as the weather gets hotter. If you are running 87 octane, you might try using a few tanks of 89 and see if it doesn't eliminate the issue. You could also try switching to another Name Brand gas like Shell, Chevron, Sunoco, Texaco.
Carbon buildup on the cylinder heads can also cause dieseling. You could try cleaning it by injecting Seafoam directly into the carb. throat. The instruction for doing this are on the back of the can.
Note: going to larger jets, will if anything, make the dieseling worse, not better.
Your problem is commonly called dieseling.
First, the smoke you are seeing is the result of a backfire through the carb. with the smoke coming out of the air filter. The backfire is caused by the dieseling.
Dieseling can be caused by several things, the first of which is too low an octane gas. This often gets worse as the weather gets hotter. If you are running 87 octane, you might try using a few tanks of 89 and see if it doesn't eliminate the issue. You could also try switching to another Name Brand gas like Shell, Chevron, Sunoco, Texaco.
Carbon buildup on the cylinder heads can also cause dieseling. You could try cleaning it by injecting Seafoam directly into the carb. throat. The instruction for doing this are on the back of the can.
Note: going to larger jets, will if anything, make the dieseling worse, not better.
Good info. I have been using 87 per the manual and actually just filled up this morning. Next tank I'll use 89 or 93.
If you have the time could you explain exactly what is happening inside engine to make this happen? I'm just curious and like to know how things work.
My first thought was that there was unburnt fuel in the engine but then I didn't understand how it was ingniting after power had been cut. Now that you use the term "dieseling" I guess my gas engine is acting like a diesel running without spark plugs?
#5
05-13-2008, 09:27 AM
#7
05-13-2008, 10:04 AM
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#8
05-13-2008, 10:19 AM
RE: Runs after turned off and smokes!
ORIGINAL: liltrk
As cHarley said, if there is carbon on the piston tops, it glows for a few seconds and ignites any unburned fuel.
As cHarley said, if there is carbon on the piston tops, it glows for a few seconds and ignites any unburned fuel.
#9
05-13-2008, 12:04 PM
#10
05-13-2008, 01:44 PM
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