Back Firing - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

shaun.1089 · 07-31-2007, 01:53 AM

When i am goin full throttle and i let off and gear down my honda backfires. Also when i turn it off it back fires and they are pretty loud. How Would i fix this ?

Honda Mechanic · 07-31-2007, 05:36 AM

We remove the pilot screw , clean the carbon (black) off the tip , install and re-adjust ..

Grtwhthntr · 07-31-2007, 08:15 AM

My wifes 400 did this all the time. Muffler had baffles gone in it, replaced it with a new one and has been perfect since.

jer400 · 09-06-2007, 10:49 PM

My weeler dose the same thing ,but only wen i slow down , i found a crack in mannifold on exhaust but ive never actually taken exhuast pipe and muffler off ,

muddyforeman · 09-08-2007, 09:12 PM

QUOTE ("shaun.1089":2bp648ue)

Quote:

When i am goin full throttle and i let off and gear down my honda backfires. Also when i turn it off it back fires and they are pretty loud. How Would i fix this ?

Hi just to let you know I had a foreman 400 new in 1996 and it backfired really really loud, you would want to wear ear plugs when it backfires it was that loud, from the first day I had it. Then I put on about 12,000km on it and had to replace the muffler and it backfired a little bit. The honda dealer says it is common for the 400. Maybe an aftermarket exhaust will solve the problem. I now have a foreman 450 not much difference but the seat is higher.

Honda Mechanic · 09-09-2007, 06:41 AM

Yes it's common with the TRX400FW .. Clean the black carbon off the tip of the air/pilot screw .. The problem is a lean missfire caused by carbon (black) on the tip of the air screw ..

red barron · 04-02-2008, 09:59 PM

havin the same problem of backfiring when leting off or gearing down.
had a frend look at it no exhoust leak, valves ajusted, new air breather, and carburator taken apart and cleaned thouroghly.still it backfires.
sitting still rev it up hard let off then hit gas twice real quik and letting go will backfire every time. please help dont know what to check next.

chevy_dad07 · 09-14-2009, 04:35 PM

QUOTE (Honda Mechanic @ Jul 31 2007, 09:36 AM)

Quote:

We remove the pilot screw , clean the carbon (black) off the tip , install and re-adjust ..

I have a 96 foreman 400 was running bad cleaned carb 3 times idles better now surges when you throttle dont know a whole lot bout wheelers but fast learner please help wife and kids wanna go riding also the carb is spitting gas out the breather side is this a timing issue or carb

4wsteve · 09-14-2009, 07:39 PM

QUOTE (chevy_dad07 @ Sep 14 2009, 04:35 PM)

Quote:

I have a 96 foreman 400 was running bad cleaned carb 3 times idles better now surges when you throttle dont know a whole lot bout wheelers but fast learner please help wife and kids wanna go riding also the carb is spitting gas out the breather side is this a timing issue or carb

This could possibly be timing or the valves need adjusted.Also I would check carb slide diafram for surging

chevy_dad07 · 09-17-2009, 05:25 PM

QUOTE (4wsteve @ Sep 15 2009, 12:39 AM)

Quote:

This could possibly be timing or the valves need adjusted.Also I would check carb slide diafram for surging

adjusted valves spring was missing on top of vacum diafram runs alot better idles good no surging still has bad back fire when reved and let off backfires out exhaust then carb still spraying gas out of carb is this typical?

07-31-2007, 01:53 AM	#1 (permalink)
shaun.1089 Honda Rider Join Date: Jul 2007 Location: Dawson Creek B.C Posts: 12	Back Firing When i am goin full throttle and i let off and gear down my honda backfires. Also when i turn it off it back fires and they are pretty loud. How Would i fix this ? __________________ Honda Foreman 400 25 inch tracker att tires Full Skid Plates 3000 pound Warn Winch

07-31-2007, 08:15 AM	#3 (permalink)
Grtwhthntr Honda Addict Join Date: Jan 2007 Location: Brandon, Manitoba Posts: 158	My wifes 400 did this all the time. Muffler had baffles gone in it, replaced it with a new one and has been perfect since. __________________ '06 Honda Foreman 500 27" Mudlites w/ITP rims 25" Bighorns stock rims 27" Outlaws w/ITP rims HMF pipe K&N filter/rejetted Iridium plug Detroit Gearless Locker TJD Cattracks Warn front bumper, 2.5 Warn Winch W/Amsteel Front and rear boxes w/driving lights, brake and b/u lights Moose Handwarmers 60C GPS Full skid w/front boot guards Gorilla Axles '06 Rubicon CTE mostly stock except for winch and tires/rims '98 Foreman 400, spare

09-06-2007, 10:49 PM	#4 (permalink)
jer400 Honda Rider Join Date: Sep 2007 Location: Kemptcity, Ontario Posts: 18	My weeler dose the same thing ,but only wen i slow down , i found a crack in mannifold on exhaust but ive never actually taken exhuast pipe and muffler off , __________________ Honda Ladd

07-31-2007, 05:36 AM	#2 (permalink)
Honda Mechanic Honda Red Wing Rider Join Date: Jul 2005 Location: Canada Posts: 1,229	We remove the pilot screw , clean the carbon (black) off the tip , install and re-adjust ..

09-09-2007, 06:41 AM	#6 (permalink)
Honda Mechanic Honda Red Wing Rider Join Date: Jul 2005 Location: Canada Posts: 1,229	Yes it's common with the TRX400FW .. Clean the black carbon off the tip of the air/pilot screw .. The problem is a lean missfire caused by carbon (black) on the tip of the air screw ..

04-02-2008, 09:59 PM	#7 (permalink)
red barron Honda Rider Join Date: Feb 2008 Location: Vermont,IL Posts: 5	havin the same problem of backfiring when leting off or gearing down. had a frend look at it no exhoust leak, valves ajusted, new air breather, and carburator taken apart and cleaned thouroghly.still it backfires. sitting still rev it up hard let off then hit gas twice real quik and letting go will backfire every time. please help dont know what to check next.

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