Hi, I have a 1999 883C and when I went to shut it off to fule it up the motor ran backwards / sputtered for a couple of seconds.

I check the oil temp guage and it showed 150, I only drove aporx 40 miles befor shutting down the bike.

Fuled up and it fired right off.

80 miles later at home, shut down and it stutters/ runs backwards again for a couple of seconds.

Motor had 12475 miles on clock and is all stock.

Running 89 octain gas,

This has got me puzzled, any Ideas as to what I should be looking for?

 

It is called dieseling. Happens a lot when there is carbon buildup in the combustion chamber and engine is hot. I would run a couple of tanks of gas with Seafoam in it and use a little bit more than the recommended 1 oz./ gal. and see if that helps.

 

Couldn't to much timing or too rich cause dieseling as well. Had an '85 Oldsmobile that used to do the same thing and had to adjust the fuel mixture and timing to get it to stop

 

I am not sure what fuel your model year calls for, but I would run 92 (Premium) octane fuel not 89 . If you do, the problem should go away.

 

Idle it down some. I assume its has a carb. To check it out before going to the trouble, Have it in gear. Foot on rear brake and let the clutch out slow to you slow engine down but not kill it. Hit engine off. If it quits OK , then just idle it down some with idle screw.

 

His bike is a 99 and can be run on low octane fuel (87)

 

+1, also, squirting some water in the carb with the bike running will break up the carbon.

The carbon glows red when you riding, when you shut the bike off, any gas that goes in the cylinders light when it hits the carbon.

 

How do you tell it ran backwards though. These guys sound like they know whats going on but i just never heard of it running backwards. Wouldnt that cause damage too. Please fill me in im a dummy lol.

 

It not actually running backwards....It's just dieseling like the others stated, and is burning the little bit of excess fuel that's getting into the cylinders while shutting down. +2 on the tricks already stated to breakup the carbon that's built up.

 

Also for those that don't know, its called dieseling because when you shut the engine down its still turns a few revolutions and makes a knocking sound like a diesel.