Minarelli V1 Sprocket Tuning

I've got a '78 City Bike that I've been rebuilding for a few months finally got it running like a dream. Top end is at about 25 or so which seems consistent with specs. I'm wondering though if there is a more efficient sprocket ratio than the stock setup. 42t rear and 9t front. I'm mainly looking for a little more torque b/c the acceleration is not great but a little more top end wouldn't hurt either. Anybody have any recommendations?

Re: Minarelli V1 Sprocket Tuning

Can't have both (low/torque & higher top end) with a sprocket change. 10, 11 0r 12 (if you can find a 12) will up the top end. If you want both, latch on to one of Ed's kits.

Re: Minarelli V1 Sprocket Tuning

time for a kit.. upping to a 10 will help speed.. what carb and intake some had the tiny carb and intake

Re: Minarelli V1 Sprocket Tuning

Its got a 14/12 carb. I'm not sure about the intake. What kit? like a cylinder expansion? Doesn't polini make something for the V1? Would changing the exhaust make any huge difference? Sorry so many questions.

Re: Minarelli V1 Sprocket Tuning

You might want to take a look at the tuning spreadsheet in the Wiki.

Re: Minarelli V1 Sprocket Tuning

basically the pipe will help gas flow and forms a pressure wave back to the cylinder and known frequency refered to as a power band by many

polini makes a good kit 47mm

dr makes a good kit 43mm

ed has some 48mm kits that are way more power than either

it all depends on how far you want to go.

if you just do a pipe then you will need to upjet anyway..you should have a 52 in there now and with a mild pipe need a 56-58 jet

Re: Minarelli V1 Sprocket Tuning

I'll trade you a 10 for the 9

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