It's best to run the engine with several gallons of gas before you dial in the tuning because it will change during break-in. If the 4 stroking continues it means it's running too rich. You can get smaller jets to get the tuning right (air/fuel ratio). The stock jet is a #70, you can try a #68 or a #66 to stop the 4 stroking.
https://www.ebay.com/itm/2-Stroke-M...980466?hash=item285d1ea1f2:g:xQUAAOSwgJ1bVjnl
https://www.ebay.com/itm/5-JETS-Low...133936?hash=item3f45737430:g:70cAAOSwkQZbWOgr
https://www.ebay.com/itm/2-Stroke-M...980466?hash=item285d1ea1f2:g:xQUAAOSwgJ1bVjnl
https://www.ebay.com/itm/5-JETS-Low...133936?hash=item3f45737430:g:70cAAOSwkQZbWOgr
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