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Honda gx 390 exhaust manifold glows red? #4648803
01/28/18 10:23 AM
01/28/18 10:23 AM
Joined: Nov 2009
Posts: 4,945
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,945
Houston, Texas
Is this bad or normal? Just wondering if it means I'm overloading it. This happened on a generator I was breaking in. I ran it at alternating loads and noticed when I had it at 90 percent load for about 10 minutes the exhaust got red hot, so I unplugged a couple things and it went back to normal.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4648810
01/28/18 10:27 AM
01/28/18 10:27 AM
Joined: Feb 2013
Posts: 534
Louisiana
SuzukiGoat Offline
SuzukiGoat  Offline
Joined: Feb 2013
Posts: 534
Louisiana
If this is a newer unit, tell your dealer. That's what the warranty is there for

If this is an older unit, make sure your intake isn't leaking anywhere.


2003 Nissan Xterra 4x4 M1 HM 10w40
2001 Toyota 4runner 4x4 M1 0w40
2016 Yamaha YXZ1000R VR1 20w50

Re: Honda gx 390 exhaust manifold glows red? [Re: SuzukiGoat] #4648823
01/28/18 10:40 AM
01/28/18 10:40 AM
Joined: Aug 2008
Posts: 339
NJ
Padawan Offline
Padawan  Offline
Joined: Aug 2008
Posts: 339
NJ
Originally Posted By: SuzukiGoat
make sure your intake isn't leaking anywhere.


Agreed - I'd suggest going over the entire intake tract from the carb to the head and make sure everything is tight and sealing properly.

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4648827
01/28/18 10:42 AM
01/28/18 10:42 AM
Joined: Jun 2004
Posts: 2,682
South Carolina
bmwtechguy Offline
bmwtechguy  Offline
Joined: Jun 2004
Posts: 2,682
South Carolina
Possible that it is runnning too lean for some reason. If/when you get it glowing red hot again, start incrementally closing the choke to richen the mix slightly and see if it glows less. Lean mixtures burn too hot.

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4648841
01/28/18 10:50 AM
01/28/18 10:50 AM
Joined: Nov 2009
Posts: 4,945
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,945
Houston, Texas
It's just the cast iron part not the muffler.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4648842
01/28/18 10:51 AM
01/28/18 10:51 AM
Joined: Nov 2009
Posts: 4,945
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,945
Houston, Texas
Are there mixture adjustment screws on these carbs?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4648875
01/28/18 11:22 AM
01/28/18 11:22 AM
Joined: Jul 2005
Posts: 30,458
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,458
NY
Originally Posted By: motor_oil_madman
Are there mixture adjustment screws on these carbs?


Mine have two of those engines on power washers, but they're older units. They run long and hard when in use and I never saw anything glow cherry red. As mentioned the carb is probably set too lean.


God Bless Our Troops

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4649041
01/28/18 01:41 PM
01/28/18 01:41 PM
Joined: Nov 2006
Posts: 19,956
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,956
MA, Mittelfranken.de
If it has a cat it may be normal. Any flames or backfiring? I would contact the dealer before messing with the carb if it is equipped with a cat otherwise fatten it up slightly if it even has adjustments to do it. It may also have an algore carb, in that case call the dealer.


ASE L1, Master. Deutsch Meisterbrief.
Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4649556
01/28/18 09:55 PM
01/28/18 09:55 PM
Joined: Dec 2016
Posts: 6,270
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,270
Waco, TX
Make sure you aren't using ethanol gas.
Ethyl alcohol leans the mixture.
Use 100% gasoline.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Honda gx 390 exhaust manifold glows red? [Re: Linctex] #4650004
01/29/18 11:49 AM
01/29/18 11:49 AM
Joined: Nov 2006
Posts: 19,956
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 19,956
MA, Mittelfranken.de
Agreed but it might be hard to get. I know in MA there is no chance except for racing fuel and that cost a small fortune.


ASE L1, Master. Deutsch Meisterbrief.
Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4650027
01/29/18 12:08 PM
01/29/18 12:08 PM
Joined: Jan 2017
Posts: 316
NJ
JLawrence08648 Offline
JLawrence08648  Offline
Joined: Jan 2017
Posts: 316
NJ
Valve problem, valve job, make sure they are seating, lap them, then adjust, or check the adjustment.

Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4655769
02/04/18 12:10 PM
02/04/18 12:10 PM
Joined: Aug 2011
Posts: 147
Va.
Piston_slap Offline
Piston_slap  Offline
Joined: Aug 2011
Posts: 147
Va.
Red exhaust manifold? This has got to be my favorite video of a diesel genny with a glowing exhaust provided by gasoline! Only 3 minutes long, enjoy. It's a riot! Diesel in distress!


1994 Ford Econoline w/302 & 4R70W
Valvoline 10W-40, Motorcraft FL1
Isotope U235
Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman] #4663290
02/11/18 08:18 PM
02/11/18 08:18 PM
Joined: Nov 2009
Posts: 4,945
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 4,945
Houston, Texas
I'm not talking about glowing bright red to the point where there are sparks coming out, but just red enough to notice in the dark.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Honda gx 390 exhaust manifold glows red? [Re: Piston_slap] #4663316
02/11/18 09:03 PM
02/11/18 09:03 PM
Joined: Apr 2009
Posts: 2,933
Canada
boraticus Offline
boraticus  Offline
Joined: Apr 2009
Posts: 2,933
Canada
Originally Posted By: Piston_slap
Red exhaust manifold? This has got to be my favorite video of a diesel genny with a glowing exhaust provided by gasoline! Only 3 minutes long, enjoy. It's a riot! Diesel in distress!


That was hilarious. What a stooge to just stand there and watch it self destruct.

Read some of the comments below the video. Very entertaining & funny too!


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