Starting to scratch my head on this one. Getting my 418 serviced and ready for snow duty for my daughter to use at the farm but after sitting for three days at a time it takes a good 10 to 15 sec. of cranking to start with full choke. It's still 18 - 20C up in my neck of the woods so I can just imagine at 10 - 15 below in Jan.
All the others in the herd are starting to giggle at it.
Bought it in late spring this year and ran it through its paces back then no problems. Sat in the horse house for three months. Cold start took about 10 sec. first time out but started like a champ each time after that. Seems to be after a two or three day sit it takes too much crank time to start.
Here's what I've done to date:
- Change the fuel filter.
- Checked the output of the pump, good flow, squirts at me when I thumb it off to check pressure.
- Placed a napkin under the fuel bowel to see if there is a leak. Nope.... clean after a day.
- checked choke plate for full closure. Hard too see but looks good.
- Checked the carb to intake, intake to cylinder bolts. All tight. Even put a little vacuum grease around the gasket areas just in case.
When i take the air filter/housing off and palm (hand) the the intake it springs to life. No 15 sec. wait. It's a walboro fix jet cab from the looks of it. Noticed yesterday that when its running and i pull the choke on. It only makes a 5 - 10% dip in engine performance. If I need to pull the carb I will but looking for some ideas of what to look for.
Air leaking by the throttle or choke shaft?
Gas siphon back out of the carb thru the pump?
I'm starting to wear a quarter sized bare spot on my head.