I'm in the process of building a polini 210 in a 2001 px disc, alloy cylinder. So far I have the kit, a 60mm Maz crank, MMW cylinder head to take the crank, Touren light flywheel, 30mm delorto, JL sip evo exhaust and a five plate clutch kit with uprated springs.. I shall of course be beefing up the bearings and seals, and matching the ports. Couple of questions though, do I need to alter my gearing, put in a t5 4th gear, and should I get a banded clutch basket? I'm after grunt/torque as there's a lot of hills round here. I was hoping 3rd to 4th would be ok because of said grunt but would like to know if anyone has experience of this. I shall post a diary of the build on here with plenty of pictures...[;)]
I have a very similar set up. Near identical except a cast barrel. Pulls like a train. Standard P200 gear ratios and SIP race basket.
And the now to the point, I have a 60mm gas flow crank too. If you do the port timing calcs this makes the Polini a bit de tuned, will pull harder but not rev out. As its not so hilly where I am I put a 2.0 mm jack up on, a skimmed flat head (28cc) and a bit of home porting :). Not noticed any drop in torque and now it revs to 8500....in 3rd and 8000 in 4th. I am now saving up for a flat slide 30mm carb!
Pierre, I don't know where you read that. I have a 2mm base gasket on mine with a skimmed flat head. really very impressive. A thin base gasket and dished head will make it slow to rev and less BHP. At least it will be economical!