1800 runs full throttle - won't idle down. - Honda Em1600x, 1800x, 2200x, Eb2200x Generator Parts Catalog

the sequence to throttle adjustment is to adjust to high speed first ( screw closest to the air filter) turn in in or out until it fires evenly at rpm and picks up rpm easily
now hold the throttle at full throttle and slowly idle down while adjusting the idle screw ( closest to the butterfly) to maintain engine running
the screw should have been turned all the way in then back out 1 1/2 turns before starting the engine
keep slowing the engine while making very small adjustment until it idles at rpm slow enough that the chain is not driving
If you get it low but it stalls out , then adjust the throttle stop screw to maintain idle rpm
Correct adjustment is from this point the rpm increases rapidly with out falter ( fine tune high speed screw to achieve that)
and when left to idle will do so evenly without driving the chain
all of this working is depending on the carby having new diaphragms , needle height adjustment correct and the system cleaned out

needs to be resyncronised on a computor by dealer !

Are you saying that it surges at full throttle and wont idle down or shut off? If so it is likely not a governor problem. Surging is a lean condition. Some models, particularly yard machines, will surge no matter the adjustment unless under a load. If it were a governor issue it would run faster and faster beyond full throttle. IF it wont idle down check the throttle control and throttle linkage and check for a sticking throttle shaft before suspecting governor. Not shutting off could also be in the throttle control. A ground clip is in the control. if the tab is not engaging the clip or the wire is not connected then the motor will not ground. Check those things before messing with the governor, especially if the machine was running good and no one has messed with it yet. Governors don't just come out of adjustment by themselves.

Could be the Throttle Position Sensor. Just changed mine and it now idles properly. Mine would occasionally surge when at idle. Mine would also rev around 1500 to 1800 at startup and take a very long time coming down to normal idle. Changing the TPS has solved all my idle problems.

Remove Carbs And Clean Then Test Again

try and clean the screen inside the muffler

i had same with my vtx 1800 i adjusted the idle , if you look to the left of engine between the pots there is a little plastic wheel on the end of a cable which goes to the throttle body, i think it is anti clockwise to increase. try this it worked ok for me however there is a cold start on these and it is operated by coolant temperature check your coolant level and top up if neccessary with the correct coolant as specified (not got info at hand)

sound like you just running low on fuel you probably dont have a problem at all don't let you fuel level run so low if it does that turn your fuel petcock to reserve and head for the nearest gas station.

Sounds like you have a vacuum leak somewhere after the throttle body.

check your Idle air valve thats what keeps your car with the right air mixture or check you idle screw for proper rpms usually they are under 1000 rpm 950 around there but i suspect it might be you air valve sensor the idle screw usually dont get outof adustment because if set from factory but is something you can look at