Exaust smoke coming out sprocket cover!!

fall_down_stand_up · #1 08-29-2009, 05:39 PM

When im at a stand still with my clutch lever pulled in and I rev the motor exaust comes out of the cover by the clutch lever were the sprocket is....What is going on?bad seal?The engine boggs when I rev it up even at a stand still with the clutch pulled in....It takes it awile to rev up....Could this have to do with the exaust smoke coming out of the sprocket cover????Driving down the road my top speed is mabe 15mph and If I pedel with it,it will eventually hit the power band and go up to 25mph sometimes....Exaust is coming out of the muffler like it should....
Thanks for any help
John-John

**Dave31** · #2 08-29-2009, 06:31 PM

Sounds like a bad seal to me.............

fall_down_stand_up · #3 08-29-2009, 09:00 PM

Quote:

Originally Posted by fairracing31

Sounds like a bad seal to me.............

Would that cause the engine to rev up slowly and bogg?

**2door** · #4 08-29-2009, 09:40 PM

Quote:

Originally Posted by granbury_man

Would that cause the engine to rev up slowly and bogg?

This is a strange one. If either side crankshaft seal was bad you wouldn't get exhaust from the clutch actuator cover. Are you certain that is what you're seeing? But to answer your question; a bad crank seal, or any air leak will cause a lean condition and poor performance. You can try the old carburetor cleaner method of looking for air leaks. Spray it around places on your engine while it is running and listen for distinct changes in rpm. The intake manifold gasket and where the carb slides onto it are the most common places to have an air leak. As for exhaust coming from the clutch actuator cover...you've stumped me there. Maybe someone else has seen this, I have not.
Tom

fall_down_stand_up · #5 08-29-2009, 09:54 PM

Quote:

Originally Posted by 2door

This is a strange one. If either side crankshaft seal was bad you wouldn't get exhaust from the clutch actuator cover. Are you certain that is what you're seeing? But to answer your question; a bad crank seal, or any air leak will cause a lean condition and poor performance. You can try the old carburetor cleaner method of looking for air leaks. Spray it around places on your engine while it is running and listen for distinct changes in rpm. The intake manifold gasket and where the carb slides onto it are the most common places to have an air leak. As for exhaust coming from the clutch actuator cover...you've stumped me there. Maybe someone else has seen this, I have not.
Tom

I am stumped as well,There is no air leaks from the cylinder to the intake or carb to intake....The engine idle's smooth,but I will spray some more carb cleaner on it and will fire it up tomorrow again and check it out and get back with you....

GearNut · #6 08-29-2009, 10:09 PM

Spray the crankshaft seals as well. If you are concerned about the carb cleaner damaging the coating on the magneto, or washing the grease off of the gears, you can also use a propane torch. Do NOT light the torch, just turn on the gas and hold the tip as close to the seal as you can. if there is a leak, the gas will be sucked in and alter the idling as well.
It also is way less messy.
EDIT: Have a CO2 fire extinguisher handy as well. Do not let Murphy get his chance to play his folly.
I personally hate Murphy's law..... :mad:

fall_down_stand_up · #7 08-29-2009, 10:24 PM

Quote:

Originally Posted by GearNut

Spray the crankshaft seals as well. If you are concerned about the carb cleaner damaging the coating on the magneto, or washing the grease off of the gears, you can also use a propane torch. Do NOT light the torch, just turn on the gas and hold the tip as close to the seal as you can. if there is a leak, the gas will be sucked in and alter the idling as well.
It also is way less messy.

thats a great idea....I never stop learning new things on this website....

Sydneysider · #8 08-30-2009, 10:53 AM

my engine had the same problem like that 2 years ago, found out due to the displaced crankshaft seal the fumes were actually travelling thru the gear assembly and out the sprocket cover, believe or not! I just pushed the seal back in with a screwdriver and it worked

fall_down_stand_up · #9 08-30-2009, 11:54 AM

Quote:

Originally Posted by Sydneysider

my engine had the same problem like that 2 years ago, found out due to the displaced crankshaft seal the fumes were actually travelling thru the gear assembly and out the sprocket cover, believe or not! I just pushed the seal back in with a screwdriver and it worked

Did you have to take the sprocket off to do this?Did the leak make your engine bogg?
Thanks for the help
John-John

Sydneysider · #10 08-30-2009, 12:02 PM

nah not really, all I had to do was push the seal back in evenly with a screwdriver thru the teeth of the crankshaft gear.. but do it carefully so as not to damage the small gear.. i dont think i can recall any bogging but there was a considerable amount of smoke coming from the sprocket cover especially when I gave it some gas. Hope this helps..