Scooterotica

How easy is it to do a Polossi using the new ally polini kit?

Joey I went and measured my Malossi piston against my , wrecked, polini 210 piston. The Malossi is a B size and was pretty much spot on to the polini and went in the polini barrel very smoothly. However, the transfer windows on the malossi would need opening up to match the ports and this may weaken the piston? I know you said someone on here said an A Malossi piston would fit easily. However as the malossi piston would need extra work to fit I'm going to go for the GS piston, especially as after checking the cases the sealing pad has been scored, only lightly, but sod it I'm going to reed the engine with a neww x360 Malossi reed valve.

The Malossi & Polini dome profiles are different too.

needs a malossi head....

As the other thread shows I killed my diablo moto polini

Im now going to go for the aly kit as opposed to the steel 208 that was fitted as I had a couple of high speed heat seizes on the M way

So questions!!

Will the new ally 210 kit work with a 60 ml longstroke crank that was fitted (which will also need replacing) ??

Do I need a different piston or will the new polini piston fit without any issues

Do I need to fit a GS piston which was fitted to the steel 208 kit??

Is there any real benefit to fitting a GS or malossi piston ??

Prior to destruction it was nearly 20 BHP and almost 19lbs of torque so not a balls out racer but a good tourer that pulled well .

I've now decided to go for ( on the re build)

New Polini alley 210 kit
SIP MMW head (same as fitted before)
Pinasco 60 ml longstroke crank (same as what Diablo fitted on the original build and set up)
Delorto 28 ml carb ( no reedvalve)
Delorto fuel pump which ive told I need with this set up.


As the tuning work has already been done im hoping this will be a re build with almost one for one swap with destroyed parts??



Really value any opinions advice on the above

Thanks

Phil

Very similar mould for both cylinders. Pistons look alsa very similar. Just put the new ally top end and run!!

fastfrog wrote:Very similar mould for both cylinder. Pistons look alsa very similar. Just put the new ally top end and run!!

Stupid question time !

so a 60 ml longstroke crank will fit with the aly 210 kit out the box and without any other mechanical alterations or need for other pistons etc??

You'll need a packer (approx' 1.5mm) to stop the piston hitting the head.......

philhnottm wrote:

fastfrog wrote:Very similar mould for both cylinder. Pistons look alsa very similar. Just put the new ally top end and run!!

Stupid question time !

so a 60 ml longstroke crank will fit with the aly 210 kit out the box and without any other mechanical alterations or need for other pistons etc??

Yes with the suitable polini kit they do a 221cc especially for a 60mm crank, comes with head also and is dowled.
Or the 210cc one which you would nee a packer for, no brainer reallyin my mind with little price difference in the 2.

Is the 221 an aly barrel ? Available from sip ??

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