>>28505717
i dont think this is part of this bike. its a single cylinder 2-stroke. and if your talking about heads like one on a 4stroke, this isnt anything but a combustion chamber with a gasket bolted to the top of the cylinder, with ports carbed out on the sides for exhaust, intake/boost.

just an exhaust connects off the back -side of the cylinder, curves around back and around to the side and out the back
>>28505718
yea but from what i've read, ive not seen it would affect 3/4 operation.

heres diagram of how the jet works on phbg. at 3/4 its controlled by needle and atomizer. it works on 1/4 up to 3/4. at 1/4 other things. not a problem there. theres 2 big parts of the needle that change for jetting. besides the clip you stick on at the cut outs along the top-blunt end of the needle, there is- the place where it begins to thin down to the pointy end. thats 1/4. that can change by swapping to another needle which begins "sooner" or "later". and the tip, which affects 3/4, by its thickness or thiness. also you can adjust it randmonly by moving the clip.
>>28505720
really.. must be cause i don't have any idea. its something maybe ive not tried before.
I have old vids from before with the same setup, when i had an airleak. it never ran well at top end either or had the smooth acceleration no matter, and always ran i faintly remember, a bit boggy at 3/4; but id have to look