I'm from Spain and a good SIP client and this is the first time that I participate in this forum so I salute you all and I thank you in advance.
I'm building a PX 200 motor, with the following characteristics:
- Polini 208 two rings.
- Standard head.
- Matched casings.
- Crank modified from standard, V shape and cut.
- Timing to 18º.
- Admission matched for Malossi reed kit with Dell'Orto PHBH30 mm.
- Exhaust JL s. steel right.
The standard carb set up (low 55, needle AV 262 + x3, high 138, slide 30) is too fat.
Next I try: low 48, AV 260 + X3 (2º clip), high 130, slide 30: I was too fat at idle (The slide?) but every thing else was just about ok: a bit lean but got more then 130 km/h.
Next: low 50 (1 turn out mix screw- No air screw), AV 262 X3, high 130, slide 30: Too fat, but just a little better at idle. Motor hesitates going from mid to high RPM
And more, and more, and more …
Best results: slide 30, low 50 (1 turn out), Av 264 + x2 (1º clip), high 130: Idle fat and irregular 4 strokes, good transition to mid RPM but not great, feels good at mid RPM, really bad transition to high RPM. When motor gets really hot the transition to high gets better. When it is colder out gets better to.
What should I do? Head? Slow jet? Slide? Main jet? Is the AV 264 +x2 OK?
I hope you will understand me and you will be able to help with the jetting: We are at see level.
I will be waiting for your answers.