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by johnd
Wed Oct 03, 2018 10:09 am
Forum: Vespa Tech
Topic: polini 187 port timings
Replies: 7
Views: 4892

Re: polini 187 port timings

Good effort but your porting is a long way from exciting. 172/119 are good solid numbers that give broad low power. I'm sure she goes fine. To go faster you'll need more than just a decent exhaust ;) If you want to beat those Chinese twist and go nutters, you're going to need way more duration. Sav...
by johnd
Sun Sep 30, 2018 1:57 pm
Forum: Vespa Tech
Topic: polini 187 port timings
Replies: 7
Views: 4892

Re: polini 187 port timings

Just thought i'd report back to this thread as i've built the engine now and taken a few rough measurements with a Vernier caliper and a port timing calculator. Longstroke Polini 187 (Iron cylinder) I used the gasket that came with the kit and an MMW malossi head for polini pistons and although i en...
by johnd
Tue Sep 18, 2018 4:50 pm
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

Re: LML125 gear ratios

Right, had a day off so I stripped Down my engine. Primary's are 21/68 and fourth is 21/35. The rest as gaz has said above. So that's a px200 cog. According to scooterhelp's gearing calculator that's a final drive of 5.13 with 22/68 and I'm guessing something closer to 5.00 with a 23 clutch cog. I c...
by johnd
Tue Sep 18, 2018 8:33 am
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

Re: LML125 gear ratios

Cheers for that shaun. I think it's going to be a case of teeth counting when I open the engine to know for sure. I'm leaning towards 22/68 or drt23/68 if my primary drive is in good condition and a drt65 tooth primary if I have to replace the Cush drive springs. So many options these days!!😜
by johnd
Mon Sep 17, 2018 8:23 am
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

Re: LML125 gear ratios

It looks like the LML 125 has a 200 4th gear cog. I'll hold off buying anything for it until I've counted the teeth of the gears though as I'm getting conflicting info on it.
As a standard 125 you really feel the gap between third and fourth, feels tall.
by johnd
Sun Sep 16, 2018 6:09 pm
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

Re: LML125 gear ratios

so it looks like 22/68 or DRT23/68 would be fine for a polini motor with those cogs. Would it be a good idea to throw a T5 fourth in to shorten the jump between 3rd and fourth do you think?
by johnd
Sun Sep 16, 2018 6:01 pm
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

Re: LML125 gear ratios

cheers Gaz.
by johnd
Sun Sep 16, 2018 4:37 pm
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

Re: LML125 gear ratios

I'm reading in different places that LML 125 engines have slightly longer gear ratios than Italian px125 motors. Anyone know where the diffence is? Is it primary drive or a complete different gear set? I'm in the process of doing a long stroke polini 187 on an LML 125 and was going to add a DRT 65 ...
by johnd
Sun Sep 16, 2018 3:04 pm
Forum: Vespa Tech
Topic: LML125 gear ratios
Replies: 9
Views: 4760

LML125 gear ratios

I'm reading in different places that LML 125 engines have slightly longer gear ratios than Italian px125 motors. Anyone know where the diffence is? Is it primary drive or a complete different gear set? I'm in the process of doing a long stroke polini 187 on an LML 125 and was going to add a DRT 65 p...
by johnd
Fri Sep 14, 2018 8:01 am
Forum: Vespa Tech
Topic: Best kit
Replies: 4
Views: 3651

Re: Best kit

VMC stelvio kit looks good too. Similar to Iron Polini 177 timings but improved everything.
https://www.10pollici.com/it/homepage/v ... 387.uw?l=2

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