Carburetor Problem - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
 
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post #1 of 10 (permalink) Old 02-17-2019, 02:47 PM Thread Starter
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Carburetor Problem

After complete disassembly and cleaning, I have rebuilt the Carburetor on 1988 TRX350D Foreman, and placed it back on the four wheeler. Cleaned the entire fuel system, tank, fuel shut off valve, new fuel filter, new spark plug. The Foreman had been sitting up for about 7 years, inside. Put new gasoline in the tank. Installed new Battery. Turned on switch. Control panel lights illuminated. Began short 2-3 second pulses on starter. After 8 or ten starting pulses, the old gal fired up and began to run at a much higher rpm than idle. Adjusting the Idle Adjustment Screw out did nothing and adjusting the Pilot Needle screw in or out did nothing.

I adjusted the timing of the throttle lever and slide piston keeping the butterfly closed while bending the metal tab to just contact when drum was moved. And I made this adjustment, on the bench, before attaching the throttle cable to the carburetor.

Thinking I got something wrong in carburetor.
Any Ideas? Thank you for your help. I am a novice. First time doing this.
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post #2 of 10 (permalink) Old 02-17-2019, 06:41 PM
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Is there any freeplay in the throttle lever?

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2007 420FM (475cc, 27x12x12 Mudbugs) ---------- 1995 300FW (webcamshaft, 350 rear end)
2008 420FE (26x9x12 BearClaws) -------------------
1988 300 (old stock machine, nothing fancy)
2009 420FA (25x8/10x12 BearClaw HTR) ---------
1987 350D (work in progress)

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post #3 of 10 (permalink) Old 02-17-2019, 09:43 PM Thread Starter
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No free play in the throttle lever.
When rebuilding carb., I replaced the float and baffle. Didn't really need to as the old one looked fine, but i did. I'm going to go through the carb and check and redo the rebuild, using the old float and baffle.

One question; The hole, where the throttle cable round nut is inserted into the carb body, is threaded as is the round nut. How far does one screw the carb. body onto the nut before tightening the lock nut?

I was super happy that the motor fired up and ran well with the old fuel pump.
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post #4 of 10 (permalink) Old 02-17-2019, 10:03 PM
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The cable will screw in quite a ways, just a few threads will be showing after the lock it is tigh usually. You can adjust the cable there and up on the throttle lever housing to get a little freeplay in the throttle lever.

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2007 420FM (475cc, 27x12x12 Mudbugs) ---------- 1995 300FW (webcamshaft, 350 rear end)
2008 420FE (26x9x12 BearClaws) -------------------
1988 300 (old stock machine, nothing fancy)
2009 420FA (25x8/10x12 BearClaw HTR) ---------
1987 350D (work in progress)

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post #5 of 10 (permalink) Old 02-18-2019, 09:26 AM
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If the slide isn't hanging up, maybe there's an air leak?


Been a while since I was into my '87 350D, but on some carbs it's possible to get the slide in backward, with the groove for the idle screw on the wrong side, so the slide sits above the idle screw = really fast idle that won't adjust.
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post #6 of 10 (permalink) Old 02-18-2019, 10:46 AM Thread Starter
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Thank you. I will check it completely. When you say slide, are you referring to the slide piston that has the main needle attached to? I didn't notice a groove in that.
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post #7 of 10 (permalink) Old 02-21-2019, 11:52 AM Thread Starter
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Been a while since I was into my '87 350D, but on some carbs it's possible to get the slide in backward, with the groove for the idle screw on the wrong side, so the slide sits above the idle screw = really fast idle that won't adjust.[/QUOTE]

When you say slide, are you referring to the slide piston that has the main needle attached to? I didn't notice a groove in that.
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post #8 of 10 (permalink) Old 02-25-2019, 04:37 PM
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The 350 carb doesn't have that on the throttle slide. You need freeplay in the throttle to address the issue.



2007 420FM (475cc, 27x12x12 Mudbugs) ---------- 1995 300FW (webcamshaft, 350 rear end)
2008 420FE (26x9x12 BearClaws) -------------------
1988 300 (old stock machine, nothing fancy)
2009 420FA (25x8/10x12 BearClaw HTR) ---------
1987 350D (work in progress)

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post #9 of 10 (permalink) Old 02-25-2019, 09:18 PM
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Sorry, I missed your question.
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post #10 of 10 (permalink) Old 03-02-2019, 09:26 PM Thread Starter
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Problem Solved

I want to thank all of you for your help and suggestions.

Finally figured out that there was not enough slack in the throttle cable.
After adjusting the cable at the handle bar and where it attaches to the carburetor, it finally purred.

Thanks again,
Mike
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