ive been inspecting more jets. another gx390 off another pressure washer....oem carb- untouched.....105 jet. super easy to start. not a hint of lean misfire.So the stock jet on a new GX390 snowblower is #102.
What were they using on older GX390 equipped blowers before they went too lean?
On a side note, I've seen a lot of mention of drilling jets.
I wouldn't even consider it as drills do not produce clean or round holes, for that you need a reamer and it really can't be done by hand as you want to ream perfectly straight. If you look at a drilled hole closely, it's pretty much trashed for anything that needs precision like a jet.
I'd always recommend buying properly sized jets.
another unit......not marked, aftermarket carb.....also seems to be very similar sized.....
another gx390 oem carb had a 92 jet.
i have a china clone 440cc......that has a 100 jet in it...and its quite hard to start, needs choke everytime.
draw your own conclusions.....
next time I pull off my carb on the ariens ax306...ill inspect that. that thing runs like a top, 1/2 a pull already running.......