Alpino 350 to 500 Conversion

S

SeeDoubleYou

Junior member
Guys I'm new to this so excuse if this one has been asked before, but what is involved with converting a 350 twin to 500? I can see that the stroke is the same that suggests that a rebore/sleeve and 72mm pistons would do the trick along with some 32mm carbs. However I'm not sure if the gear ratios are the same or if there are any other significant differences that can catch you out.

Also if a piston swap is viable how easy are they to obtain and would an upgrade be available perhaps to raise the compression ratio.

Thanks
 
Apparently not worth doing due to complication and expense.
I think the head is very different and maybe even stud spacings (not sure about that though).
 
Grant is correct the head is very different, smaller valves (all eight of them) and smaller inlet tracts, not just smaller carbs, the 350 is a gutless slug and the 500 is marginally better but still gutless and lungless, the Monty however is a little rev box, I once saw 11,500 when I raced one, on a "daren't change gear" dash for the line and no it wasn't an ND rev counter but a Krober. The 350 is a rather rare beast as well, and I know someone looking for a good (ish) one, wh at 81 years old is finding his 1200 a bit heavy, especially as he was crippled at 18 and cant bend his right knee
CLEM
 
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