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Old 01-09-2017, 05:04 PM   #1 (permalink)
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02 foreman giving me hell

Fourwheeler: 2002 foreman 450 S

Problem: starts when choked, runs fine on choke for about 10seconds, then spits and sputters until dead. Sometimes runs for roughly one minuite but it spits and sputters down to low rpm followed by returning to high idle (choked) every 10seconds or so.

Things I have repaired/replaced that I know were bad: timing chain tensioner, timing chain, and the tensioner arm/.

Things I have repaired/replaced that I thought were bad: brand new carburetor off ebay, rectifier/voltage regulator (used in "good condition"), new spark plug, ignition coil (used in "good condition").

When I replaced timing chain, tensioner, and such I just put the piston TDC (thru hole with both dots aligned on cam/sprocket with mark on engine case. I turned motor over by pull start rope and verified dot/case mark alignment and tdc thru inspection hole, also rockers were slacked.
I also put air line on spark plug hole to verify no bent valves, held pressure fine with no leaks thru intake or exhaust side.

I verified there was no restrictions in the muffler by removing all baffles and the whole end cap arrestor.

This is the carb I bought http://m.ebay.com/itm/381796235070?_mwBanner=1

After all of the above the problem remains the same.

I am at a loss. Any help would be greatly appreciated as I need this thing back running for the ranch.
If theres a honda guru on here that would like to take the time out of their day to help me out over the phone I would greatly appreciate it.
I am mechanically inclined and with a little more honda experience help maybe I could knock this out!

Thanks in advance,
Austin.
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Old 01-09-2017, 05:42 PM   #2 (permalink)
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There are some great folks here and expect you will be hearing something soon. It certainly sounds like a fuel issue...
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Old 01-09-2017, 06:18 PM   #3 (permalink)
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first off if your bike is a 450S then it is really a 2001 down , from 2002 up it was called a 450 FM , the interchange says 2001 is a different carb then 2002 up ------------ I can't see the other side the carb you posted the pic of , I have a 2002 450FM , there should be an black plastic air circuit valve bolted to the other side the carb with hoses and a tee , which I don't see in the pic , I am not going to tell you anything about the cloned carb and it not being a OEM , I have had great luck with clones and saved a lot of money , I would tell you it seems to me you may have a universal carb which is not the right one for you bike , have you tried a new spark plug and adjusting the carb , start out about 2- 2 1/2 turns
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Old 01-09-2017, 06:59 PM   #4 (permalink)
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Its a 450fm, it is a 2002 year model i just described it as an "s" to differeniate it from the ES.
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Old 01-09-2017, 07:01 PM   #5 (permalink)
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that's a china after market carb. no way in hell will you see a trx450 carb sell for 40 something bucks from Honda ?!!..lol. we need you to look for the sticker on the front of the frame, under the front fender, and tell us what the model says on the sticker ?.
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Old 01-09-2017, 07:02 PM   #6 (permalink)
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As I stated I did install a new spark plug, the carb did not have what you described, the mounting holes and threads were not tapped for the thing you described? You thing this may be my problem? I still have the original carb but the tubes you speak of appeared to be blocked off anyways so I assumed it was not necessary for smooth running.
Thanks a lot!
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Old 01-09-2017, 07:02 PM   #7 (permalink)
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Quote:
Originally Posted by 02honda450s View Post
Its a 450fm, it is a 2002 year model i just described it as an "s" to differeniate it from the ES.
FM is used in place of the S on that year :-).
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Old 01-09-2017, 07:03 PM   #8 (permalink)
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Quote:
Originally Posted by 02honda450s View Post
As I stated I did install a new spark plug, the carb did not have what you described, the mounting holes and threads were not tapped for the thing you described? You thing this may be my problem? I still have the original carb but the tubes you speak of appeared to be blocked off anyways so I assumed it was not necessary for smooth running.
Thanks a lot!
can you please take a few pics of your old carb ?, all around it please ?, and post it in this thread :-).
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Old 01-09-2017, 07:05 PM   #9 (permalink)
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The sticker came off but i know its a 2002 honda trx450fm. Is the carb a big no-no? Should I start by cleaning the stock carb up and re-trying it?
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Old 01-09-2017, 07:09 PM   #10 (permalink)
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yes I would buy a OEM carb rebuild kit and rebuild and clean the OEM carb, china carbs are hit and miss and more misses than hits, and why there so cheap as to new OEM one's

second, if carb is RIGHT, there is a good chance its your CDI that is making all this happen
if anyone of your friends has a like machine, try swapping, as NO other way to test and 110% DON"T buy an aftermarket CDI< way lower odds of getting china made electronic's to work in these atv's they MIGHT work for a bit then die, and end up buying again soon, do it right once, cry once, will last again for 15+ yrs as this one did! IF its the CDI
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