I am building a P200 engine with Polini 208 cc barrel, piston, head etc. I bought the unit complete and the casings have been ported already. It is the steel barrel version with a piston with two rings. I have just purchased a serie pro gas flowed race crank and countless other new parts. Bearings, seals, in fact everything I could need to do a full rebuild. The barrell has been cleaned and rings gapped correctly. Everything that needs replacing is being replace, even the engine mountings!
The engine came with a dellorto SI 26-26mm carb and I also have a dellorto SI 24-24mm carb. I do NOT want to be putting PHBH car or anything like that on the bike. I would prefer to use one the carburrettors I have already.
I am planning to fit a fast flow fuel tap, and also the DRT float chamber with 5.2mm float to whichever carburretor I choose to use on the engine.
My questions are as follows:
1. Am I better to use the 24mm carburettor rather than the 26mm carb? Some people in the UK say the 24mm is a better choice. I have no idea why?
2. How should I jet the carburrettor for a polini 208cc ported engine? I have heard many different views on this. I need to know the size of idle jet, air corrector, mixer and main jet - at least as a starting point to work from.