Recent Topics
Best Oil For Late Model Toyota V6 Engines ?
by ChrisD46
14 minutes 38 seconds ago
Ford 4.6L Durability?
by Auae85
Yesterday at 11:00 PM
Mercedes Benz High Mileage Badges
by Snagglefoot
Yesterday at 10:46 PM
Lawn Tractor Tire Sealer
by 97K15004WD
Yesterday at 10:01 PM
Fireworks Stores
by Warstud
Yesterday at 09:36 PM
1994 Ranger fuel tank/frame cleanup & NOS part
by 01rangerxl
Yesterday at 09:27 PM
Koreans top J.D. Power qlty; Ford, GM, FCA make strides
by wemay
Yesterday at 09:18 PM
How Fast to Run a ZeroTurn Mower
by Gebo
Yesterday at 09:10 PM
Bosch 3300 C&P Yamaha FZ-07
by bmwpowere36m3
Yesterday at 08:49 PM
My FIL in hospice
by fdcg27
Yesterday at 08:41 PM
Spraying Polyurethane
by Texican
Yesterday at 08:37 PM
Dehumidifier icing
by Kestas
Yesterday at 08:37 PM
Diesel lube in Petrol Engine
by Ducked
Yesterday at 07:46 PM
New key programming cost
by 92saturnsl2
Yesterday at 07:27 PM
When you help someone and its time to walk away
by RazorsEdge
Yesterday at 07:09 PM
Sightly overfilled oil..ok or drain?
by flinter
Yesterday at 07:08 PM
Wheel says 50 mph max
by pda1122
Yesterday at 06:54 PM
15w40 Maxlife in Motorcycle
by Brian553
Yesterday at 06:39 PM
BITOGer in Ottawa/Orleans Canada area ? ...
by Papa Bear
Yesterday at 06:36 PM
Old Engine SOUND
by MasterSolenoid
Yesterday at 06:06 PM
Newest Members
yamahaboy125, Turboholic, TrpNY, bcj, Ilia
65282 Registered Users
Who's Online
75 registered (2003f7, Amenhotep, AndyB, aquariuscsm, advocate, 07Piloteer, 8 invisible), 1212 Guests and 25 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
65282 Members
67 Forums
285686 Topics
4767898 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Topic Options
#4648803 - 01/28/18 09:23 AM Honda gx 390 exhaust manifold glows red?
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: 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.


Top
#4648810 - 01/28/18 09:27 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
SuzukiGoat Offline


Registered: 02/04/13
Posts: 534
Loc: 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


Top
#4648823 - 01/28/18 09:40 AM Re: Honda gx 390 exhaust manifold glows red? [Re: SuzukiGoat]
Padawan Offline


Registered: 08/24/08
Posts: 333
Loc: 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.

Top
#4648827 - 01/28/18 09:42 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
bmwtechguy Offline


Registered: 06/15/04
Posts: 2673
Loc: 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.

Top
#4648841 - 01/28/18 09:50 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: 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.


Top
#4648842 - 01/28/18 09:51 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: 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.


Top
#4648875 - 01/28/18 10:22 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
demarpaint Offline


Registered: 07/03/05
Posts: 29762
Loc: 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


Top
#4649041 - 01/28/18 12:41 PM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
Trav Offline


Registered: 11/20/06
Posts: 18877
Loc: 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.

Top
#4649556 - 01/28/18 08:55 PM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: 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."

Top
#4650004 - 01/29/18 10:49 AM Re: Honda gx 390 exhaust manifold glows red? [Re: Linctex]
Trav Offline


Registered: 11/20/06
Posts: 18877
Loc: 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.

Top
#4650027 - 01/29/18 11:08 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
JLawrence08648 Online   content


Registered: 01/20/17
Posts: 234
Loc: NJ
Valve problem, valve job, make sure they are seating, lap them, then adjust, or check the adjustment.

Top
#4655769 - 02/04/18 11:10 AM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
Piston_slap Offline


Registered: 08/06/11
Posts: 136
Loc: 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

Top
#4663290 - 02/11/18 07:18 PM Re: Honda gx 390 exhaust manifold glows red? [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4851
Loc: 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.


Top
#4663316 - 02/11/18 08:03 PM Re: Honda gx 390 exhaust manifold glows red? [Re: Piston_slap]
boraticus Offline


Registered: 04/19/09
Posts: 2905
Loc: 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!

Top