totally logical: si24 ROTARY needs a 210(!) mj (for 16hp) while a phbh30 REED just needs a 130 mj (for 30hp)

WHY EXACTLY should the WEAKER engine with a cropped compromise SI carburettor engine need a 80(!!) sizes bigger main jet?

you have fuel supply problems guys! thats why a 210mj is driveable. if you optimize the fuel flow to FOR SURE having enough fuel, such big main jets will DROWN the engine = not driveable.

Be aware: only a huge main jet does not put you on the safe side. as long as u do jot have enough fuel delivered, this engine is NOT stet correctly.

first of 1,2,3 videos to show you the effects of huge mj´s:
vesspa px 200my:2007, otuning light, polini box, but still the bad ORIGINAL tap, but with just a 2,5mm main jet, this setup needs a 122 mainjet.

q1: is a 140 driveable? (+18 sizes)
q2: is a 180 driveable? (+73 sizes)

see the videos for the answers
test is without carb case lid for faster jet exchange
the lid makes everything richer, as it reduces the air flow


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DISCLAIMER: the information shown in this video, is about THIS specific hardware. it is my personal observation documented with this video. It DOESNT automatically mean, that all such parts by this producer or seller do have or will have same issues.
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