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I feel i need a whole thread for my issues  ,  new to scooters but loving the mod bug ! i have a qmj 150 hunter style  . I have a uni air cleaner and a shorty free flow exhaust . I drill my main jet @ 122 fromn a standard 114 . here is my spark plug  ? it pops on de-accel but Im sure thats typical with no back pressure  . but here is pics of my spark plug after @ 50 miles at this setting  

im also looking to upgrade my cvt  .  Is there  a standard size , weight spring  ratio that works best ? also I have no tach. wouldnt mind adding one . would it be as easy and getting a hunter style speedo with tach ? instead of a huge gas level indicator ? want to upgrade clutch springs , variator sliders rollers(UNSURE OF DIFFERENCE) and main clutch spring . im stuck with to much information some say this and other say that .  Ill just stick with u know it alls : 0) 

I'm using actually a modified stock air filter . I plugged up the stock top hole then strap down in the air box . using same snorkel . my main thing would be I can cut down the air by adding another sleeve . so go for 118 and if it runs lean then add another sleeve to reduce air and enrich it . sry guys a girl here trying to be a mechanic lol

The bike is a 150cc longbo adventure .unsure of how to find the engine code :/ would most motorcycle shops have mains available or is this typically something u need to online order ?

 took my carb off to do a jet change as I am going to put a uni air filter and a free flowing exhaust and seen where it states usually go up 2 sizes per mod . I took carb apart and now I'm really confused . the carb is a Deni pd24j and I took the pilot screw out to clean it and it looks fine . went to take out main jet(think its main jet only other screw there) it says 114 of it . however all the replacement jets are tiny in size and mine is larger then the pilot screw . do somwcarbs have different size (length) of jets ? Any suggestions on what to do or what size to start with .Stock the bike ran a little lean . 

thanks for the response. my credit card says the ammount is on hold and would auto release after 10 days so ill see if it goes through . I already ordered the part via ebay as it is a unique part that I dont seem to find anywhere . However i WILL USE the vendors listed above in the future . thanks for all the replies <3 u

it wasnt a big order just a important piece that I havent seen available elsewhere but then again I dont think I looked very hard  .  it was paid through credit card 103.00