Hunting throttle when cold 520H

[Junkyard_sal 11]

I have have a low hours WH 520H

 

when cold the idle hunts. 
 

my small engine guy doesn’t want to touch an Onan saying parts are not available.

 

i know the intake could be a problem but it doesn’t seem to change when I spray carb cleaner all over with the air filter off.

 

that said adding choke seems to smooth it out. 
 

is there a good carb rebuild kit or intake seal kit? When running right this thing is a beast but the hunting is super bothersome and can be problematic if it dies on a steep slope! 
 

 

[Ed Kennell 43,475]

If you all ready checked the intake for leaks, just clean the carb.     I had to clean mine 3 times to finally stop the searching.

[Junkyard_sal 11]

Checking the intake again tomorrow with more carb cleaner 

 

is there a good carb kit if I get in there and something is amiss 

[953 nut 62,701]

Are you running gasoline with ethanol? If you have been then change over to ethanol free gas and run some Berrymans B12 fuel treatment at twice the recommended rate. Here is a site that will show you the gas stations in your area that have ethanol free gas.   

https://www.pure-gas.org/

[lynnmor 8,160]

Clean the carb, you may not need any parts besides the intake and carb base gaskets.  There is no such thing as an intake seal kit.  Hope you don’t have a fire spraying cleaner all over the place.