[rcsmith270]

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.

 

[GirlsRideToo]

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.

 

[rcsmith270]

Thanks will do.

 

[mrbb]

also inspect the fuel cap vent too, might be getting vapor lock, if cap is not venting properly and causing fuel flow issue's

 

[Manny]

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.

 

[fishfiles]

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

 

[Goober]

Do you have the original carb?
I suspect your choke cable is not actuating the starter valve on the aftermarket carb. Aftermarket carbs usually don’t fit the choke and or throttle cables.

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

 

[LedFTed]

never buy china, is most, the rule, when it pertains to anything. especially honda atv.
should be the golden rule..