Have had an hmf pipe on it for a while and put the jet that they gave me (160 or 170 I think) in it. Seemed to run great for months but the last two times I've taken it out its been cutting out in the middle of second and third gear. It only does it at those times, other than that it runs good. It has been hotter lately. help please

 

recheck your jetting and your fuel.and check your clip position on the needle
you might have to go down 1 notch
mine did the same thing and the carb was out of tune alittle
had it readjusted and now its fine