catman25 scooter mod help thread By catman25 (Read 239 times)

[catman25]

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) 

[Bashan]

From the pic that plug looks a little lean. They're supposed to be a light tan....not bare. It shouldn't pop. You may have an exhaust header leak at the port, which can ruin a valve. Or your ACV valve isn't working, or you're just running too lean, which can also damage your engine. With that air cleaner and exhaust you're moving a boatload of air. Before upjetting, try putting a cover halfway over the Uni and see what happens. Rich

[Alleyoop]

YEP, popping on DE-CEL is LEAN and on DE-Cel the main jet has squat to do with it. It is the PILOT JET ,the IDLE may be set to low and or richen up the Fuel Ratio Mixture try 1/4-1/2 turn and see if that stops the poop.
Alleyoop

[catman25]

OK lost a but on exhaust head . added a new o seal tightened everything up .put on a Lil longer but still free flowing muffler no pops nice papapapa on deacell. Not spark white has a light light coffee tan color OK so you all think if I got a speedo with tach it would work or Any suggestions for just picking up a tach separate ?

[catman25]

OK lost a but on exhaust head . added a new o seal tightened everything up .put on a Lil longer but still free flowing muffler no pops nice papapapa on deacell. Not spark white has a light light coffee tan color OK so you all think if I got a speedo with tach it would work or Any suggestions for just picking up a tach separate ?