2002 Foreman Fourtrax won't take throttle - Honda ATV Forum
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post #1 of 7 (permalink) Old 06-08-2019, 09:57 AM Thread Starter
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2002 Foreman Fourtrax won't take throttle

I have a 2002 400 with a new carb and a new petcock. starts fine and idles great. It won't take throttle to rev after start unless it idles a while. Carb screw is out 2 1/4 like manual says. Acts like it's not getting a sufficient supply of gas. Fuel line was replaced by a guy that worked on it. Don't get it.
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post #2 of 7 (permalink) Old 06-08-2019, 09:55 PM
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Originally Posted by rcsmith270 View Post
I have a 2002 400 with a new carb and a new petcock. starts fine and idles great. It won't take throttle to rev after start unless it idles a while. Carb screw is out 2 1/4 like manual says. Acts like it's not getting a sufficient supply of gas. Fuel line was replaced by a guy that worked on it. Don't get it.
When you replaced the petcock did you also clean the gas tank??

Is the new carb OEM? If not, that's likely the problem because it does sound like you still have a carb problem and probably the jet needle.

Please search this forum. There are many threads about the same problem you are having.

Hope this helps you.
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post #3 of 7 (permalink) Old 06-09-2019, 07:57 AM Thread Starter
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Thanks will do.
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post #4 of 7 (permalink) Old 06-09-2019, 08:09 AM
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also inspect the fuel cap vent too, might be getting vapor lock, if cap is not venting properly and causing fuel flow issue's
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post #5 of 7 (permalink) Old 06-10-2019, 06:03 PM
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Sounds to me like you've either got a leak on the top of the diaphragm cover from improper assembly or a pinhole in the rubber diaphragm itself.

In order for a CV style carburetor to rev up it must be able to create vacuum and lift the slide/diaphragm assembly.
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post #6 of 7 (permalink) Old 06-10-2019, 06:48 PM
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I remember when mine would not rev past half throttle and Manny told me check the diaphragm and sure enough it was split , ran perfect after changing it
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post #7 of 7 (permalink) Old 06-10-2019, 08:40 PM
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Do you have the original carb?
I suspect your choke cable is not actuating the starter valve on the aftermarket carb. Aftermarket carbs usually donít fit the choke and or throttle cables.

Check the service manual for carb number
I personally would acquire an oem carb and start over.

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