WIll not run please help me - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum

Supertrick · 01-29-2012, 06:37 PM

Okay I have posted a couple of other threads but I thought I would start a new one. I have aquired a 2003 Honda Foreman 450 FM and I got it cheap beacause it wouldnt run and they did not Know why. I am pulling my hair out trying to figure it out. I removed and cleaned the card, I checked the valves and mad a minor adjsutment, I checked the timing (could only check it when cranking) and it checked out fine, compression seem good, getting spark, new plug, getting fuel, gas in tank, petcock on, and all lines are clean and clear. The one thing that I can tell you is there is a lot of fuel bieng blown back into the airbox and I know this is not correct. The machine will fire breafly when I use starter fluid. I have worked on it for a couple of days now and need some insight if anyone has it.

rich450es · 01-29-2012, 06:41 PM

how are the valves ? are thay adjusted to spec

Wingman · 01-29-2012, 06:41 PM

Try adjusting the valves?

Supertrick · 01-29-2012, 06:44 PM

I went by the book on adjusting the valves and they were pretty close. I did notice that the adjusting screw is not perfectly parallel with the top of the valve. Is that normal.

brutus750i · 01-29-2012, 07:02 PM

when checking the timing what mark do you see thru the access plug?also if in doubt pull the plug an stick a screwdriver into the plug hole an see if the piston is at the top of the cylinder too then look at site plug an you should see the letter t. anyone correct me if im wrong but i think im right.

Wingman · 01-29-2012, 07:03 PM

Id do a compression check because it sounds to me that you have a intake valve not closing enough and Im thinkin thats why you are getting fuel blown into airbox?
One of the guys that work on these things for a living will chime in soon and may have better ideas.

Supertrick · 01-29-2012, 07:13 PM

That will be great. I was thinking about the valves and when I was adjusting them I never looked to see if they were functioning properly, maybee one is stuck or something. I am going to go back out and check it, if I dont it will bug me.

Supertrick · 01-29-2012, 08:06 PM

okay I triple checked the valves and the timing mark. The timing mark is on the T and I pulled the plud and I could see the top of the piston. I would watch the valves as I pulled it over and they didnt seem to be opening and closing one after the other. It would be one open then the other would look like it might open but not the the one would open again and the other would open just fine. I am no expert but wouldnt they be opening alternatley all the way? Why would the one open in one stroke and not the other? Also after a random pull start one valve would have a 1/4" between the screw asnd the valve and the other would be tight. Are tey supposed to be at the same gap all the time or not?

rich450es · 01-29-2012, 08:15 PM

does the valve get stuck ? it may have a broken valve seat (the valve seat pulls out of the head ) you may have to pull the head to check it

Supertrick · 01-29-2012, 08:23 PM

I watched it and one valve (after I pulled it over) would be open and then slowly close back.

01-29-2012, 06:37 PM	#1 (permalink)
Supertrick Honda Rider Join Date: Jan 2012 Posts: 66	WIll not run please help me Okay I have posted a couple of other threads but I thought I would start a new one. I have aquired a 2003 Honda Foreman 450 FM and I got it cheap beacause it wouldnt run and they did not Know why. I am pulling my hair out trying to figure it out. I removed and cleaned the card, I checked the valves and mad a minor adjsutment, I checked the timing (could only check it when cranking) and it checked out fine, compression seem good, getting spark, new plug, getting fuel, gas in tank, petcock on, and all lines are clean and clear. The one thing that I can tell you is there is a lot of fuel bieng blown back into the airbox and I know this is not correct. The machine will fire breafly when I use starter fluid. I have worked on it for a couple of days now and need some insight if anyone has it.

01-29-2012, 06:41 PM	#2 (permalink)
rich450es Honda Red Wing Rider Join Date: Nov 2010 Location: ludlow,mass Posts: 10,524	how are the valves ? are thay adjusted to spec __________________ 2000 foreman 450 es-s the fking pig 14% 300 foretrax gear reduction 30in gorila silverbacks on C-5 wheels 2500lb warn winch superatv disk brake conversion kit 2in ssatv lift kit and progressive 512 shocks the original 4in PVC storage tube hurculined racks with rear cargo box czr loud exhaust , uni airfilter and drilled main jet foreman 450 parts for sale pm me for info**

01-29-2012, 06:41 PM	#3 (permalink)
Wingman Honda Red Wing Rider Join Date: Mar 2010 Location: Rockford Illinois Posts: 931	Try adjusting the valves? __________________ Honda 1998 Foreman 450s (Starburst Yellow) SS ATV 2in lift Maxxis Bighorn 2.0 tires Aluminum Products Bash plate Viper 3500 winch & Cycle country 52in plow ES floorboard conversion HONDA!!! No Wing! No Prayer!!

01-29-2012, 07:02 PM	#5 (permalink)
brutus750i Honda Lover Join Date: Jan 2010 Location: summerville sc Posts: 361	when checking the timing what mark do you see thru the access plug?also if in doubt pull the plug an stick a screwdriver into the plug hole an see if the piston is at the top of the cylinder too then look at site plug an you should see the letter t. anyone correct me if im wrong but i think im right. __________________ 29.5 wide laws on all 4 corners on 12 inch ss wheels,full snorks front an rear,homemade winch bumper with 2500 winch,2 in lift with hl springs,14% gear reduction,rear led brake light,disc brakes,tool tubes,a arm skids,2.5 inch rear spacers,cut floorboards with frame riser mod all this on an 04 foreman. kids 01 foreman on 27 mud machine tri claws wide on all 4 corners,snorked.

01-29-2012, 07:03 PM	#6 (permalink)
Wingman Honda Red Wing Rider Join Date: Mar 2010 Location: Rockford Illinois Posts: 931	Id do a compression check because it sounds to me that you have a intake valve not closing enough and Im thinkin thats why you are getting fuel blown into airbox? One of the guys that work on these things for a living will chime in soon and may have better ideas. __________________ Honda 1998 Foreman 450s (Starburst Yellow) SS ATV 2in lift Maxxis Bighorn 2.0 tires Aluminum Products Bash plate Viper 3500 winch & Cycle country 52in plow ES floorboard conversion HONDA!!! No Wing! No Prayer!!

01-29-2012, 06:44 PM	#4 (permalink)
Supertrick Honda Rider Join Date: Jan 2012 Posts: 66	I went by the book on adjusting the valves and they were pretty close. I did notice that the adjusting screw is not perfectly parallel with the top of the valve. Is that normal.

01-29-2012, 07:13 PM	#7 (permalink)
Supertrick Honda Rider Join Date: Jan 2012 Posts: 66	That will be great. I was thinking about the valves and when I was adjusting them I never looked to see if they were functioning properly, maybee one is stuck or something. I am going to go back out and check it, if I dont it will bug me.

01-29-2012, 08:06 PM	#8 (permalink)
Supertrick Honda Rider Join Date: Jan 2012 Posts: 66	okay I triple checked the valves and the timing mark. The timing mark is on the T and I pulled the plud and I could see the top of the piston. I would watch the valves as I pulled it over and they didnt seem to be opening and closing one after the other. It would be one open then the other would look like it might open but not the the one would open again and the other would open just fine. I am no expert but wouldnt they be opening alternatley all the way? Why would the one open in one stroke and not the other? Also after a random pull start one valve would have a 1/4" between the screw asnd the valve and the other would be tight. Are tey supposed to be at the same gap all the time or not? Last edited by Supertrick; 01-29-2012 at 08:12 PM. Reason: Added to

01-29-2012, 08:15 PM	#9 (permalink)
rich450es Honda Red Wing Rider Join Date: Nov 2010 Location: ludlow,mass Posts: 10,524	does the valve get stuck ? it may have a broken valve seat (the valve seat pulls out of the head ) you may have to pull the head to check it __________________ 2000 foreman 450 es-s the fking pig 14% 300 foretrax gear reduction 30in gorila silverbacks on C-5 wheels 2500lb warn winch superatv disk brake conversion kit 2in ssatv lift kit and progressive 512 shocks the original 4in PVC storage tube hurculined racks with rear cargo box czr loud exhaust , uni airfilter and drilled main jet foreman 450 parts for sale pm me for info**

01-29-2012, 08:23 PM	#10 (permalink)
Supertrick Honda Rider Join Date: Jan 2012 Posts: 66	I watched it and one valve (after I pulled it over) would be open and then slowly close back.

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