Smoke from carb?

[TwoFish]

My engine has had a miss for a while now (more noticeable when cold) 1998 75 hp.

Comp 140 all.
New fuel pump and filters.
Cleaned carby.
Timing set to 32 static. Set at 30 degrees ststic the miss was still there.
New plugs today ( seems better but I?m not convinced.).
Checked for spark with a timing light whilst running.

I have not checked stator, CDM or trigger. Mainly because I lack the knowledge but I think this is probably the next step.

I noticed that a wisp of smoke was coming out of the carby after I had run the engine in the driveway today. Is this normal as I can?t remember seeing this before? Possible reed problem?

Thanks

Dean

 

[81 charger]

Re: Smoke from carb?

mine ran a little lean and would do that when i would throttle down be for i readjusted them.

 

[jerryjerry05]

Re: Smoke from carb?

I think that he only has 1 carb.
Try setting the air screw out 1 turn.
Then,motor warm,in gear,in the water.
Turn air screw in till it bucks,kicks,stutters,stalls then out 1/2 turn.
Some motors,the reeds don't close off all the way.They can be open as much as 1/32 -1/16"
Maybe it's comming back from this.
Wouldn't worry if the reeds are ok.
Plugs burning right??Had a bad head gasket and still had 150# comp on all three cylinders.

 

[TwoFish]

Re: Smoke from carb?

Thanks for the replies.

Yes it does only have one carb. This makes seeing the reeds difficult as you can only see the top reeds and part of the second set. What I can see look OK. Sounds like the smoke is leaking back past the reeds for a short time after the motor has stopped. There is only a very small amount. My concern was trying to track down a severe miss when the engine is cold. Though the reeds may have been involved.

Changed the plugs yesterday and so far the miss is gone. I’ve had the miss for a while and I thought I’d tried new plugs before but perhaps my memory could do with some new parts as well. Plugs looked to be burning evenly though.

We went fishing today and ran the motor for about forty minutes and it didn’t miss a beat. The trip was cut short when we moved to reset the anchor and stopped the motor to hear the starter still running. Finish up being a stuck solenoid. As it was late in the day we called Sea Rescue to ask them not to take their rescue boat out of the water yet. Once we were sure what the problem was we gave the solenoid a tap with a hammer and we were able to get underway again. It was exciting hanging off the back of the boat in choppy seas.

The air screw is set at 1? out at the moment and with the new plugs is running smoothly. I’ll rest after the other repairs are completed.

I’ll need to order a new solenoid and strip the starter down to see what condition it is in. Got to love boating!