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Hi Feetup,
What premix ratio do you use in your M49? Right now I'm using Spectro semi at 50:1 and it's running rich
feetupfun
The standard carby is notorious for running rich due to rapid wear of the needle jet and needle. When the carby is in tip top shape they run great with the standard carby.
I run 50:1 with an Aussie semi synth Penrite