Smoking air box

N

nberg

Joined

Sep 23, 2010

Messages

45

• Oct 4, 2014

• #1

Started my MKIII, warmed it up for a minute and let it idle. Smoke started coming out of right air box intake.
Original Amals. Plugs are brown in center and black elsewhere.

Probable causes?????

Thanks for the help.

 

Torontonian

Joined

Dec 28, 2009

Messages

5,494

• Oct 4, 2014

• #2

Richness due to needles ,jets etc, all worn out. Strap on mini fire ext. until you rebuild carbs . :|

 

R

Rohan

Joined

Aug 26, 2010

Messages

8,215

• Oct 4, 2014

• #3

What color smoke ???

 

Deets55

VIP MEMBER

Joined

Oct 3, 2013

Messages

1,605

• Oct 4, 2014

• #4

Are you sure it is from the carbs? Your alternator connections are right under the airbox rt hand side and so is the starter cable. Could it be electrical?

 

Deets55

VIP MEMBER

Joined

Oct 3, 2013

Messages

1,605

• Oct 4, 2014

• #5

There is also a vent line from your oil tank that goes to a catch tank (sort of) and then into you air box right there. You can see it when you remove your side cover.

 

N

nberg

Joined

Sep 23, 2010

Messages

45

• Oct 4, 2014

• #6

Smoke was gray in color.

I checked elec connections and they seemed fine.

 

O

olChris

Joined

Oct 6, 2013

Messages

865

• Oct 5, 2014

• #7

nberg said:

Started my MKIII, warmed it up for a minute and let it idle. Smoke started coming out of right air box intake.
Original Amals. Plugs are brown in center and black elsewhere.

Probable causes?????

Thanks for the help.

Click to expand...

When did the "smoke" come out of air cleaner..

1. while it was idleing?
2. when it stopped/shutdown?
3. when you give it a quick rev it backfired ,stopped, and puffed smoke from aircleaner??..

IMO no smoke should come out of aircleaner when its running cos induction side draws inwards... If smoke emits from air cleaner when running. Switch it off and find the nearest fire extinguisher!!!

 

Hobot

Joined

Oct 19, 2005

Messages

18,978

• Oct 5, 2014

• #8

IMO no smoke should come out of aircleaner when its running cos induction side draws inwards... If smoke emits from air cleaner when running. Switch it off and find the nearest fire extinguisher!!!

Click to expand...

My thoughts exactly. White smoke comes from hot oil vapor or too hot wire insulation vapor, black smoke from burning oil or burning plastic, so grey smoke implies heat of smoldering oil or plastic before open flame appears. First get a video set up then handy extinguisher to let us watch ya burn with Commando enthusiasm.

 

N

nberg

Joined

Sep 23, 2010

Messages

45

• Oct 5, 2014

• #9

Could not duplicate issue today. Have to assume smoke was from oil tank breather as bike had not been run for a while. Finished fine tuning timing and went for a ride. Bike ran beautifully.

Thanks for the advice.