2007 honda foreman 500FM running lean - Honda ATV Forum
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post #1 of 23 (permalink) Old 04-26-2015, 01:50 AM Thread Starter
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2007 honda foreman 500FM running lean

Sorry guys haven't posted in a very long time been too busy at school, but I need some help I am rebuilding this foreman 500 I rebuilt the topend with new timing chain piston and rings, it never ran good before i rebuilt it it would bog down cough splutter and never ran properly so a rebuilt the carb and put it on and started it today and it ran really hot and popped through the exhaust and airbox, I put the old jets back in making no difference it pops out the exhaust on deceleration and I can feel the heat from the exhaust, it has no air leaks from what I can tell and the carby has no adjustment the pilot screw tis like a half moon shape so I can't turn it and the needle has no grooves to move the clip.

anyone got an idea what I should do motor is stock no mods

here is a vid of what it sounds like (the motor is quiet its just the echo of the popping in the shed)

https://youtu.be/xjv-ZPN2e6E

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post #2 of 23 (permalink) Old 04-26-2015, 06:16 AM
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You could have an exhaust leak at the pipe to head union. What does a new spark plug look like after running for a few minutes? If it is bone white, your engine is running very lean.

It could also be a timing problem, especially if it is popping back through the airbox. With this situation, I would not run it hard because you are probably close to seizing a piston.

Rick

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post #3 of 23 (permalink) Old 04-26-2015, 08:37 AM
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didn't sound terrible. Timing off or valve need finer adjust? did you rebuild the top end too?

Last edited by Goober; 04-26-2015 at 08:42 AM.
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post #4 of 23 (permalink) Old 04-26-2015, 04:04 PM
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Jake, Good to hear from you again. I was wondering what happened. Good luck on the rebuild.





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post #5 of 23 (permalink) Old 04-27-2015, 06:06 AM Thread Starter
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Quote:
Originally Posted by b52bombardier1 View Post
You could have an exhaust leak at the pipe to head union. What does a new spark plug look like after running for a few minutes? If it is bone white, your engine is running very lean.

It could also be a timing problem, especially if it is popping back through the airbox. With this situation, I would not run it hard because you are probably close to seizing a piston.

Rick
Ill check the exhaust and check, there is a pic of the plug its white not bone white but whiter than I would like, ok I,ll check the timing out I thought I had it right but ill double check it
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atc 70, atc 90,atc 110 2x trx 250,88,89,96 trx 300, 92 &00 300 fw, atc 250

big bear 350 4x4,big bear 2x4 timberwolf 250 2x4, ytm 225dr 85 ytm 200ERN

klf 300 bayou,prairie 250, klf 185 bayou

suzuki quadrunner 250
Get your free manual here
https://www.hondaatvforums.net/forums...all-years.html
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post #6 of 23 (permalink) Old 04-27-2015, 06:09 AM Thread Starter
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didn't sound terrible. Timing off or valve need finer adjust? did you rebuild the top end too?
I made exhaust and intake the same normally i wouldn't but the manual said the valve clearance was the same is that right? yes rebuilt the top end

atc 70, atc 90,atc 110 2x trx 250,88,89,96 trx 300, 92 &00 300 fw, atc 250

big bear 350 4x4,big bear 2x4 timberwolf 250 2x4, ytm 225dr 85 ytm 200ERN

klf 300 bayou,prairie 250, klf 185 bayou

suzuki quadrunner 250
Get your free manual here
https://www.hondaatvforums.net/forums...all-years.html
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post #7 of 23 (permalink) Old 04-27-2015, 06:10 AM Thread Starter
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Jake, Good to hear from you again. I was wondering what happened. Good luck on the rebuild.
Yeah im still around schools too hard too much homework, but im stillin doin bikes, ill try to hop on more often

atc 70, atc 90,atc 110 2x trx 250,88,89,96 trx 300, 92 &00 300 fw, atc 250

big bear 350 4x4,big bear 2x4 timberwolf 250 2x4, ytm 225dr 85 ytm 200ERN

klf 300 bayou,prairie 250, klf 185 bayou

suzuki quadrunner 250
Get your free manual here
https://www.hondaatvforums.net/forums...all-years.html
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post #8 of 23 (permalink) Old 04-27-2015, 08:59 AM
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Does is start right up or is it hard to start? www.nflowmotorsports.com


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post #9 of 23 (permalink) Old 04-28-2015, 03:33 AM Thread Starter
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Does is start right up or is it hard to start? www.nflowmotorsports.com
it is a little hard to start its not push of the button like my 300 I rebuilt it takes some throttle/choke

atc 70, atc 90,atc 110 2x trx 250,88,89,96 trx 300, 92 &00 300 fw, atc 250

big bear 350 4x4,big bear 2x4 timberwolf 250 2x4, ytm 225dr 85 ytm 200ERN

klf 300 bayou,prairie 250, klf 185 bayou

suzuki quadrunner 250
Get your free manual here
https://www.hondaatvforums.net/forums...all-years.html
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post #10 of 23 (permalink) Old 04-28-2015, 06:09 AM Thread Starter
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ok correct me if i'm wrong but for me to check the timing im going to have to pull the motor right?
sorry first time doing one of these 300's are so much easier!! im gonna check the valves but im leaning towards one tooth out on the timing

atc 70, atc 90,atc 110 2x trx 250,88,89,96 trx 300, 92 &00 300 fw, atc 250

big bear 350 4x4,big bear 2x4 timberwolf 250 2x4, ytm 225dr 85 ytm 200ERN

klf 300 bayou,prairie 250, klf 185 bayou

suzuki quadrunner 250
Get your free manual here
https://www.hondaatvforums.net/forums...all-years.html
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