Gx 140 header and air filter

#1
So I have an old gx 140 in a rupp roadster , wanted to put a header and Intake on . Bike runs great with just the header but with the big intake runs way to hot and lean , iv tried every size of jet to richin the ratio but no luck , maybe stock carb won’t allow anough fuel and need slid carb ? Tried .036 .037 jets still lean , any suggestions
 

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#2
If you can't find a jet big enough, drill one out. You can get a cheap wire drill set and go up one size a time until it's good. If you drill it too big, you can silver solder the hole shut an redrill.
 
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