rather not drill the jet,but should be able to go
UP one size cant I.Are the threads on a JET a common size/industry std. and are they available at most small engine repair shops?
Nope. My CZ, Triumph, Harley, Holley carbs and AFBs, Makuni, Delorto, Bing and etc. are all different. The proliferation of new sizes and designs by Japan and China goes on unchecked. There is only a small chance that you will find the next size jet for your 97cc engine at a small engine repair shop locally. Hopefully you can order one from somewhere. My response to the leanness [that is suppose to save out pristine environment] is to use number drill to find the approx. size and then go to the next larger size. Has worked wonders every time. The drawback is that you usually need a dill somewhere between #60 and #80.
If you could get a jet [with shipping] for 10 bucks you would be spending 10% of what a new clone engine is worth. But then, the eco-Nazi rules on imports also make it also come into the states jetted rather lean.