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Old 10-28-2020, 10:12 PM   #1
TheREALducy
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Default G9 running lean

I have a g9 full stock it was running well for a while then started choking out and running with half power. I have stock jetting I replaced the air cleaner, fuel filter, cleaned the carb, and set the float level. It keeps running lean. I took the main jet up a size and it is still lean. Does anyone have any ideas?


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Old 10-29-2020, 07:15 AM   #2
slonomo
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Default Re: G9 running lean

Check the pilot jet, they are notorious for clogging. I usually remove them, use a piece of small copper wire, run it through the jet a few times, spray it, blow air and reinstall. They are tiny and seem to clog with the smallest particles like sand. Then, drain and flush your fuel system to remove the gunk that caused it.
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Old 10-29-2020, 02:03 PM   #3
CP241
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Default Re: G9 running lean

Make 1000% sure the airbox lid is completely sealed. Also make sure the plastic spacer between the carb and the head is not cracked. They crack super super easily and will cause this also. It doesn’t take much to make the engines lean out.

Also wouldn’t hurt to check the valve adjustment. If the intakes are loose it won’t suck in quite as much air and can cause it to lean out.
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Old 10-30-2020, 04:24 PM   #4
TheREALducy
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Default Re: G9 running lean

Quote:
Originally Posted by CP241 View Post
Make 1000% sure the airbox lid is completely sealed. Also make sure the plastic spacer between the carb and the head is not cracked. They crack super super easily and will cause this also. It doesn’t take much to make the engines lean out.

Also wouldn’t hurt to check the valve adjustment. If the intakes are loose it won’t suck in quite as much air and can cause it to lean out.

I just checked that plastic carb spacer is cracked. It looks like it’s only cracked on the outside of the one stud. After pulling the carb it seems as if it’s blowing back into the intake there’s fuel residue in the hose from the air box to the carb. I lashed the valves maybe a month ago but I will check again


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