2 Stroke Help with fouling plugs 85

Hey guys. Not sure if this is the right spot to ask but I bought a 07 RM85. Starts first kick. But i bought it 3 weeks ago and I’m on my 7th spark plug. I’ve been using br10s. I tried a 9 and it worked well untill the bike wouldn’t start and I realized the spark plug was halfway loose and probably ruined the plug. With stores being closed I’ve only been able to find 10s. I’m 155 lbs and a mediocre to new rider. I putt around the yard and in the pit maybe ever get in 4th gear. On the road I open her up. My mix is 40 to 1 with premium gas and Castrol oil. I’ve only met 1 guy in the pit who was pretty drunk but told me my bike needs to run in powerband all the time. Anyone know what I could try. Thanks so much
 
Be sure air filter is clean and properly serviced .... Is it stock air filter ? Float in carb set properly ? Maybe raise throttle metering needle clip up one notch ....... maybe cleaning muffler and exaust ports ........
 
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