2011 hisun hs 400 carbeurator model

[johnney]

it started bogging down when under acceleration.  so first i replaced the carbeurator, no change. now i replaced the wet assembly and no change.  what am i missing. is there a sensor or something im missing. HELP, HELP, HELP

[Ben1098]

Check the spark plug.  Tells the fuel air mixture ratio.  Tan color is what you want.  A fouled plug....dark and or sooty will blow out (not spark) under heavy ignition energy requirement such as acceleration.  Example was late night bed roll traveling H-D Sporty rider who wanted to "impress" me (sitting on a V65 Honda---V4 of grunt) while waiting on him so I could pull out after he went by.  Yellow headlight......his regulator has croaked.....battery getting low on minimum ignition voltage level.  Predictable cough stumble, and misfire instead of hearing his shorty pipes go by.  Tailed him waiting for the death knoll.  6 miles later on a gradual uphill 3/8 mile long hill......he puked.....Naturally, I slowed for him to pull over and land so he could see with my headlight.......then give him a 1st gear 60MPH redline header romp.  Now, that is what is what it should sound like.      Gone.

Lots of info in the above short story.  Weak ignition will run ad idle but fail under load.  Fouled spark plug.  Ignition wiring rubbing on sharp metal edge and a partial insulation failure.....will only corona (ring of fire) under load.  Fuel air mix.....BOTH a right mixture and lean mixture will foul a plug.  Rich is obvious.  Lean mix gives a misfire and UNBURNED fuel to wet down the plug and then fail.  Mice.....remove air intake plumbing to give free air at the carb inlet.  Check air box and all plumbing for mouse house.  Fuel pump diaphragm getting hard....low fuel level in the carb  bowl.  Test bottle of gas for this test.   Last...............bad pump gas...getting bad here over non-national gas station buyouts.  My favorite station (always good gas for old Ford gas tractor and Grasshopper).  Station bought out.....didn't know.  Bought 8 cans of junk premium 93 and when used, the Grasshopper run OK for about a minute.  Switched on the deck and died....hard to restart....pulled back to shed and drained slop.

[Jaygyver]

If it's doing the exact same thing with the new carb then you might make sure the gas filter is clean (and pointed in the right direction) and make sure the gas lines aren't partially plugged. You can just blow into the line from the filter going back to the tank and it may unclog anything at the tank. It should feel the same as blowing thru a straw into water, maybe a bit more effort seeings how the line is smaller. You might be able to hear it bubbling in the tank.

 If not, grab your old carb and clean the jets out and check that the float is at the right level. It may just need cleaning from gas getting old and the inside passages contaminated over time. Unless the new carb came from the dealer not all carbs you buy online are very reliable. Have you tried adjusting the new carb?.

 If you're not a carb person then you should be able to take it to a dealer or shop and see if they can rebuild it for you. You might have to fine tune the idle screws if you just take the carb in but if you take the whole vehicle in they can have everything adjusted for you.

 As been mentioned, have you checked the air filter to see if a mouse made a nest in it and blocking the airflow?

You might be able to go online and download the service manual from the manufacturer of the engine and chassis.