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@primavera130 avatar
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I toasted my ally Polini 210. I have,a stock top end and GS brand piston to get the bike running till i can afford to get a new kit. Will the MMW head for the Polini 210 work with the stock cylinder? If i have a good squish?
@subetherbass avatar
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1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
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1997 Italjet Formula 125, 2 matching N.Z. '69 VBC Super, 177cc Racer, VespaCross Bodge, Puch SRA150, Piaggio Zip 100! & others
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UTC quote
I use a Polini 177, & have used LML, Polini, MMW, & now a Parmakit heads all on the same kit, so suspect it will work
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One or two fun scoots....nothing too precious
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Just wondering why you bought the MMW head. The Polini head for the 210 ally kit looks good with the additional cooling fins on the underside. What was the reason for not using it?

The MMW head may work as a stop gap, but it will be a mis-match in terms of bore, squish clearance and profile. The stock piston (GS in your case) has quite a pronounced crown, which may be very different to the Polini piston that the MMW head was profiled for. Some kits use almost flat top pistons but I've not seen the Polini.

You may be better off getting hold of a stock 200 head which are very easy to come by.
@ginch avatar
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74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
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@ginch avatar
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Standard bore is 66.5 vs. Polini 69mm. So as Swa45 points out, you'll be mis-matched in that there will be combustion happening beyond the edge of the piston above the cylinder deck. Compression will be down because the head will have a greater volume than you need. But if you do it, let us know what happens!
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@primavera130 avatar
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UTC quote
Thanks for talking me down guys. I wasn't thinking of the bore size and squish being outside the stock bore diameter.

SWA45- The Polini Ally kit I got didn't come with a head, hence the MMW head profiled for that kit. I see thta POlini now has both versions with and without. Not sure if they did when I got it.

I do have a stock head (a few). But it is a USA 200 head, so low compression (to meet emissions laws in the US in the 80s).

That's what I was trying to avoid.
@xantufrog avatar
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1980 P200E - "Old Rusty", 1976 ET3 Primavera
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@xantufrog avatar
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I dunno, the USA head is probably better on the stock cylinder than some crazy thing with the wrong size machining
@ginch avatar
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@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
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Location: Victoria, Australia
UTC quote
primavera130 wrote:
I do have a stock head (a few). But it is a USA 200 head, so low compression (to meet emissions laws in the US in the 80s).

That's what I was trying to avoid.
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@xantufrog avatar
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@xantufrog avatar
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I'd that the only difference, ginch?
@ginch avatar
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Veni, Vidi, Posti
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@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
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UTC quote
xantufrog wrote:
I'd that the only difference, ginch?
To be honest I don't know for sure. But for half an hour and a few grades of paper, it's an easy fix. Plus you can always reverse it with a head gasket/spacer.
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@primavera130 avatar
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Ginch wrote:
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Ha!
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