Can you adjust jetting on a stock carb!!

I have the F1 pocket bike carb, I am a little lean as I have ported the head. can I richen the mixture somehow without buying a new carb??? Jets are as much as a new good carb. so If I spend the $$ I'll just get a new carb. Can you raise the needle or bore the jet??? I have all the machine tools to do it. but am not sure if this is what others have had sucess with. Also there was a Walbro carb that is adjustable on ebay, is this a good one??? Any thoughts are appreciated

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Supersport Pro roadracer
Suzuki Canada, 600cc sponsor class

you can drill out the venturi bore to 14mm or 9/16inch then flair out the outer venturi to 19mm max using a grinding cone, you can either buy a pack of jets or drill out your existing jet to size 72 and then adjust the main needle until you get the right setting for your engine. if needed i have a pic showing how to flair the venturi.

for sure I would love the pic. size 72 you say, what drill size is that?? Also if I bore out the carb do I go right through?? will the stock slide be big enough?? (the slide attached to your throttle cable) I was just thinking the bore can't be bigger than that slide right? thx for your help in advance bro.

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Supersport Pro roadracer
Suzuki Canada, 600cc sponsor class

jet size 72 is machine drill no 72, you can drill right through the carb with a 9/16 inch bit and match the intake manifold to suit.

thx a lot for the advice

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Supersport Pro roadracer
Suzuki Canada, 600cc sponsor class