Back Firing - Page 2 - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

4wsteve · 09-17-2009, 08:37 PM

QUOTE (chevy_dad07 @ Sep 17 2009, 05:25 PM)

Quote:

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?

I don't think it should spray gas out the carb but I never checked. Do you have an air filter on it?
You may need to richen the needle=idle mixture screw
Also check for exhaust leak

chevy_dad07 · 09-18-2009, 05:22 PM

QUOTE (4wsteve @ Sep 18 2009, 12:37 AM)

Quote:

I don't think it should spray gas out the carb but I never checked. Do you have an air filter on it?
You may need to richen the needle=idle mixture screw
Also check for exhaust leak

ok here is a new tid it does have a small exaust leak at the head tightened bolts got little better with the air box off it runs like a top put the breather and box back on starts surging again

4wsteve · 09-18-2009, 09:50 PM

QUOTE (chevy_dad07 @ Sep 18 2009, 05:22 PM)

Quote:

ok here is a new tid it does have a small exaust leak at the head tightened bolts got little better with the air box off it runs like a top put the breather and box back on starts surging again

Did you install the proper spring in the carb? Did you do anything to richen the carb?
You need to tune it with the air box on for it to run properly with the air box on!

a676man · 10-07-2009, 08:53 AM

QUOTE (shaun.1089 @ Jul 31 2007, 12:53 AM)

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 ?

MY 450 does that I put a new plug in it set the jets ajust the valves put carb cleaner in it i will ckeck the exhaust mine back fires very loud like a gun going off

a676man · 10-10-2009, 10:12 AM

well i put a new seal on the exaust put a new plug in it ajust the valves put carb cleaner in it
and it still backfires what else can I do ?

4wsteve · 10-10-2009, 01:17 PM

QUOTE (a676man @ Oct 10 2009, 10:12 AM)

Quote:

well i put a new seal on the exaust put a new plug in it ajust the valves put carb cleaner in it
and it still backfires what else can I do ?

Maybe you need to adjust the fuel mixture screw? And also it might help to take
the screw out and clean the tip. Then put the screw about 2 and 1/2 turns out or maybe 3

a676man · 11-01-2009, 06:44 AM

QUOTE (4wsteve @ Oct 10 2009, 12:17 PM)

Quote:

Maybe you need to adjust the fuel mixture screw? And also it might help to take
the screw out and clean the tip. Then put the screw about 2 and 1/2 turns out or maybe 3

Thanks I will try that

benson318 · 02-14-2010, 11:38 AM

hello all
i know this is old post so sorry for draging it back ,
But did any of you guys get to bottom of 450 backfire ?????
i know it could be one of many small things causeing this did cleaning you pilot jet help ?
My foreman 450 does same when you rev or race it hard and then wind down to stop BANG
(would scare the **** out of you if you didnt expect it not much good for going shooting !!! every thing scared away ! )
The atv run great other wise may be wee bit hard to start when cold my old 300 started firs time all the time but when started its fine to start after so

Please any clues where next Honda dealer thinks mite be choke sticking have checked seems ok mite replace it its not to dear

trevor arsenault · 12-31-2010, 08:59 AM

drive it harder, and just think people are shooting at you.

Dawg Fan · 12-31-2010, 03:39 PM

check to make sure that the drain cap on the bottom of the airbox is on good. That caused my forman to backfire.

12-31-2010, 03:39 PM	#20 (permalink)
Dawg Fan Honda Red Wing Rider Join Date: Jan 2010 Location: Jacksonville, FL. Posts: 621	check to make sure that the drain cap on the bottom of the airbox is on good. That caused my forman to backfire. __________________ 09' Foreman Half Camo / Half Tan Color 28" Outlaws 1-1/2" wheel spacers 2" Perfex Long Arm Travel Lift HMF Utility Exhaust Dyno Jet Kit K&n Filter and Outerware Home Depot Snorkle

10-10-2009, 10:12 AM	#15 (permalink)
a676man Honda Addict Join Date: Jan 2007 Location: Olyphant pa Posts: 208	well i put a new seal on the exaust put a new plug in it ajust the valves put carb cleaner in it and it still backfires what else can I do ?

02-14-2010, 11:38 AM	#18 (permalink)
benson318 Honda Rider Join Date: Jan 2010 Location: N Ireland UK Posts: 16	hello all i know this is old post so sorry for draging it back , But did any of you guys get to bottom of 450 backfire ????? i know it could be one of many small things causeing this did cleaning you pilot jet help ? My foreman 450 does same when you rev or race it hard and then wind down to stop BANG (would scare the **** out of you if you didnt expect it not much good for going shooting !!! every thing scared away ! ) The atv run great other wise may be wee bit hard to start when cold my old 300 started firs time all the time but when started its fine to start after so Please any clues where next Honda dealer thinks mite be choke sticking have checked seems ok mite replace it its not to dear

12-31-2010, 08:59 AM	#19 (permalink)
trevor arsenault Honda Rider Join Date: Feb 2010 Location: PEI CANADA Posts: 3	drive it harder, and just think people are shooting at you.

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