Wed Nov 24, 2021 10:07 am

Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1788
Location: UK (South East)
 
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1788
Location: UK (South East)
Wed Nov 24, 2021 10:07 am linkquote
Beedspeed is listing a 60mm stroke Polini crankshaft with a 110mm conrod for the small block largeframe motor. I've sent an email asking for confirmation, but in the meantime, can anyone confirm that Polini offers such a crank? I cannot find other information and the German resellers are showing the standard 105mm conrod?

https://beedspeed.com/collections/vespa-crankshafts-1/products/vespa-px-125-150-cosa-racing-crankshaft-polini-60mm-stroke-110mm-conrod
Wed Nov 24, 2021 10:54 am

Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2581
Location: Veria, Greece
 
Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2581
Location: Veria, Greece
Wed Nov 24, 2021 10:54 am linkquote
Polini lists only two cranks with 57mm and 60mm stroke, no 110mm conrod…

https://catalogue.polini.com/dep/210_0062_0063.pdf
Wed Nov 24, 2021 11:44 am

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 4244
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella
Joined: 16 Jun 2011
Posts: 4244
Location: Nashville
Wed Nov 24, 2021 11:44 am linkquote
This isn't the most scientific of comparisons, but it might be the nerdiest.

I thought the angle of the crank in the photo looked too acute to be a 110 rod, so I took pictures of a couple cranks off my shelf to compare.

The 57mm/105 rod crank looks about like the Polini, whereas the 60mm/110 rod P200 crank has a markedly different angle.

So I'm going to guess whoever was doing data entry just didn't know that 125/150 cranks have 105 rods.


The crank in question


57/105 P125/150 baseline


P200 60mm/110 rod for comparison

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