Generac portable generator will not start

[Marten Hirsch]

I have a Generac portable generator gp7500 series that is a couple of years old. I used it for 4-5 days almost continually (converted to natural gas). I shut it off and then put it away. Several weeks later I tried to start it and i get virtually nothing-- just an occasional backfire. It has about 100 hours of usage. I have tried to solve the starting issue but with no luck. I have done the following.

1. Changed oil.
2. Checked for spark
3. replaced spark plug and checked the gap
4. Disconnected low oil shutoff sensor
5. Tried to start with carb cleaner as opposed to the natural gas
6. Opened up the valve cover to make sure either one of the valves was not stuck (I have not checked the valve clearance yet)
7. Replaced the fuse that I found.

Would a suddenly mis adjusted valve be the cause of a complete lack of any ignition? Does anyone have any ideas with what might be the root cause of the failure to start.

Any suggestions would be greatly appreciated.

Thanks.

Marten

 

[ILENGINE]

Wouldn't happen to have that little wasp that likes to plug outlet holes in muffler do you.

 

[tom3]

Were you getting a good blue spark across the plug gap?