unless you have an extra $200+ for a topend rebuild and possibly the bottom end too, i suggest not riding it again until the above mentioned problems are fixed, figure out the airbox boot, and mix a good 2 stroke oil @ 32:1
thats 4 ounces of oil to every gallon of gas
i prefer maxima super m
and while that carb boot is still off, it would also be financially wise, to check what main jet is in there, should be around a 270 for that pipe...with the airbox boot connected actually sucking air thru the filter, that boot off has to be creating a lean condition = booooooom !!!!!
search for, or click the bottom link in my sig below, for links to all kinds of good stuff, including plug chops and leakdown tests, or your next thread may be....."whats a good piston and who can rebuild this for me ???"