carb ?

Keith 944 · 03-07-2012, 03:31 PM

question: what causes a carb to smoke after the engine has been turned off?
always thought to change metering block gaskets, but they are new...

HR9121 · 03-07-2012, 04:22 PM

Keith you maybe leaking gas through the needle and seat. I'd check that first it don't take much if that's not it you may be a little rich on your setup. Hope this helps.

jims5600 · 03-07-2012, 07:51 PM

Gotta agree with fuel getting past the needle andseat assembly. I don't
beleive that it is a issue to worry about.

Keith 944 · 03-08-2012, 10:15 AM

thanks guys, any way to check this, or a remedy, or just replace needle and seat?

Rick Bailey · 03-08-2012, 01:06 PM

Also check the gaskets behind the power valve/blocks

Rick

jims5600 · 03-08-2012, 03:17 PM

Keith just change the needle assembly and see what it does

Rick Bailey · 03-09-2012, 10:03 PM

So ??????

Larry Fulton · 03-11-2012, 04:36 PM

Make sure the Float is set properly

Make sure the Needle & Seat are in good / usable condition

Make sure the Seat Is Tight
(yes, I have seen these loosen & start to back themselves out)

Verify Proper Fuel Pressure

reknapp52 · 03-12-2012, 12:09 AM

Is it really smoke?? Could it be fuel vapor coming back up from an open intake valve?

440lebaron · 03-12-2012, 08:48 AM

most of the time its fuel vapor. left over gas in intake. if anything is leaking look down carb with flashlight you should see boosters dripping if seats/floats are leaking

03-07-2012, 03:31 PM	#1
Keith 944 VIP Member Join Date: Feb 2006 Location: Dela-where? Posts: 2,153 Likes: 1,060 Liked 1,740 Times in 551 Posts	carb ? question: what causes a carb to smoke after the engine has been turned off? always thought to change metering block gaskets, but they are new... __________________ KEITH MAYERS 2 X somebody many X nobody

03-07-2012, 04:22 PM	#2
HR9121 Live Reporter Join Date: Jan 2011 Location: New Bern, NC Posts: 3,399 Likes: 122 Liked 3,095 Times in 678 Posts	Re: carb ? Keith you maybe leaking gas through the needle and seat. I'd check that first it don't take much if that's not it you may be a little rich on your setup. Hope this helps. __________________ James Williamson W200 J/SA

03-07-2012, 07:51 PM	#3
jims5600 Member Join Date: Oct 2011 Posts: 125 Likes: 47 Liked 21 Times in 9 Posts	Re: carb ? Gotta agree with fuel getting past the needle andseat assembly. I don't beleive that it is a issue to worry about.

03-08-2012, 10:15 AM	#4
Keith 944 VIP Member Join Date: Feb 2006 Location: Dela-where? Posts: 2,153 Likes: 1,060 Liked 1,740 Times in 551 Posts	Re: carb ? thanks guys, any way to check this, or a remedy, or just replace needle and seat? __________________ KEITH MAYERS 2 X somebody many X nobody

03-08-2012, 01:06 PM	#5
Rick Bailey Senior Member Join Date: Sep 2002 Posts: 502 Likes: 5 Liked 10 Times in 7 Posts	Re: carb ? Also check the gaskets behind the power valve/blocks Rick __________________ Rick Bailey 3439 SC

03-08-2012, 03:17 PM	#6
jims5600 Member Join Date: Oct 2011 Posts: 125 Likes: 47 Liked 21 Times in 9 Posts	Re: carb ? Keith just change the needle assembly and see what it does

03-09-2012, 10:03 PM	#7
Rick Bailey Senior Member Join Date: Sep 2002 Posts: 502 Likes: 5 Liked 10 Times in 7 Posts	Re: carb ? So ?????? __________________ Rick Bailey 3439 SC

03-11-2012, 04:36 PM	#8
Larry Fulton Member Join Date: Oct 2003 Posts: 270 Likes: 52 Liked 0 Times in 0 Posts	Re: carb ? Make sure the Float is set properly Make sure the Needle & Seat are in good / usable condition Make sure the Seat Is Tight (yes, I have seen these loosen & start to back themselves out) Verify Proper Fuel Pressure __________________ Larry Fulton

03-12-2012, 12:09 AM	#9
reknapp52 Junior Member Join Date: Nov 2008 Location: Cascade, CO Posts: 48 Likes: 22 Liked 7 Times in 5 Posts	Re: carb ? Is it really smoke?? Could it be fuel vapor coming back up from an open intake valve?

03-12-2012, 08:48 AM	#10
440lebaron Junior Member Join Date: Feb 2012 Location: westerly ri Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	Re: carb ? most of the time its fuel vapor. left over gas in intake. if anything is leaking look down carb with flashlight you should see boosters dripping if seats/floats are leaking