Modern Vespa

Now there's a scoot done up right for a long haul, looks the part for sure and sounds like the mechanicals are in perfect order or soon will be. I especially like your be-kind-to-my-ass seat mods and trendy safety taped headlite.

Probably a good idea to stay within the speed rating of your tires... Heidenau K75's have an "M" rating, which is 130 km/h.

here is the FINAL gearing
GPS said top was 117km/hr on first day, & it was quicker on day 2... Or so the GPS told me as it seized...

Hardest bit was remembering if i was in 3rd or 4th... 1200rpm rev drop between gears sure ensures the power stays on!
Im stoked at the final gearing setup... But for higher speed it would be tempting to get a longer primary.... But for twisties going 2-3-4 while under full power was simply awesome... Damn impressive!

I played with the calculator again... & here are the results:

So, after a good lengthy ride this past weekend, fully loaded & mostly as a cruisy pace (leader was goin 85kmh on GPS)... These are the results...

Revs: the revs were down a bit, but i guessed that as still need to book a dyno, & rebuilt carb (fuel was pouring out) night before rally, then there was an airleak (revs would stay high between gears, & after 20-30 sec at lights the revs would go up), so it was a sedate (for me) ride... Potential revs vs actual revs do differ,& in reality its always goin to be lower.

Resistance: wind, hills, other riders, riding a brick, rider & luggage weight, friction, scoot components age & numerous other factors cause resistance... Which in reality is more than you expect.

Reality: while a calculator is a great thing, its a rough guide only, & even physics change the outcome.

These are my REAL results (as much as i could remember & write down while riding...

There is a nice rev range, just below the powerband, which if you sit there, its easy (from those revs) to accelerate, get up a hill, pass someone,or simply take-off into the distance ... However its easy to sit & cruise at this speed/rev all day & watch the scenery.

Above that there is the powerband, where fun is to be had & egos enlarged... However its only for shorter periods & generally for accelerating quickly, going up hills , pass etc, but unlikely the motor will last 100's of constant kms at this range.

Then there is MAX speed/revs, the bit you use on real steep bits, or where you want to be right in the powerband (if your gears are spaced too far apart), or when you need to extract every possible rev to hang on the lower gear till after the guy on the harley changes first & loses momentum, which is short-term thing & will make your motor explode/fail/cook real quickly!

... So what was the REALITY of Speedys setup?

125 & 122 relate to differences due to a jet change.
Top rev appears to be 7000-7500rpm (likely more, but counteracted by additional weight).
3rd will rev more than 4th as there is less load & motor has better ratios vs resistances, i guess this is why dyno results are done in 3rd gear.

... So what is to be learnt?

When calculating gearing & Revs (using aforementioned calculator), use 4500-6000 as your cruising range, 6000-7000 as your powerband, & 7000-7500 as top revs... Then you will be in a realistic reality.
Yeah, it will be quicker without so much luggage, & after a damn good tune, but thats a bonus!
Perfection was 84kmh in 4th, it seemed to keep going back to that speed on its own, then goe all antsy trying to bolt!

I played with the calculator again... & here are the results:

YAY, the new floats arrived, plus a clear bowl, so it will be easy to see whats happening inside & where the fuel level sits.
now to fit it over the weekend & go for a ride. Def will start with the HEAVY one, as it simply makes more sense in my eyes.

Yip, Speedy is FINALLY running well & so far reliably.

After yet another rebuild (thank you ohh so much Rolf) , the motor is now running well, & fast again.

Crank was replaced due to bluing around bigend.
Cyl was replaced with a heavily modified 166cc Malossi.
Shaft was replaced with a non-twisted version.
New Polini Dellorto 28PHBH was fitted.
Needles & jetting were assessed & retuned (details later, once i find the info)

Now I get to enjoy Speedy again.

I'm getting fit for a wee ride to Queensland, then the Mille (1000km in 2 days)
Gears are more awesome Than I remember.
Minor bits to do only

Now you need to check your timing at those peak revs and see that it's within spec... we need to do something about the crazy overheating.
Do you know what revs it is doing at the peak?

On Xmas day went for a ride with Il Ginchi & got a flat tyre, which caused Speedy to "fall over" (as speed), & for the rest of the ride the clutch was "rough", and hard to change UP thru gears, but, so what, I knew the plates were worn, so didn't care too much & continued.
Then, A few days ago I Went out for a ride on Speedy along Grand Ridge Rd with Il Ginchi... clutch was still the same, and adjustment did nothing, but riding without a clutch is something I'm very capable of doing, so ignored it, except it "slipped" a few times. Then it stopped (sounded like it ran out of fuel, or timing was out... as we were on a wonderful rough gravel road, jet was unblocked, & flywheel was (forcibly) removed (once jammed key was dislodged), it looked like it was not sitting "quite right", so sanded a bit & put back on ... riding along & lost drive yet again... so out came the spare plates (I always carry!) & off with the clutch cover... which had a bit of grey mulched metal under the cover (nothing unusual there!)
Well... then out came the clutch basket... grabbing it & having a look I realised I hadn't actually undone the nut yet!
Yip, out it came!
It had SNAPPED off the crankshaft! Which had a cool rounded, pointy end!

That was it for the days ride!
An hour ride asillion on the Green Ginch Mobile (where i may or may not have taken a nap) back to the van, then a return trip to pick up Speedy from deep in the bushes on the side pf the track we went!

I guess that's the end of that motor, till i can afford another VBC1 Crankshaft.

Info on the Recent Flywheel changes; Changing flywheel size... SUCCESS is COOLNESS!

Wow. That was some lucky break. Need a new crank but the clutch escaped without a scratch.
Was that crank a 60mm? If not speedy could be speedier.

The one with the PX taper is a useful upgrade and very good IMO, and PX ignitions are plentiful, either new or used. That said, it does seem a shame to not use the Vespatronic

What's the issue with buying a 60mm? Will give quite a bit more power than a 57. Can't see a downside.

And that faster opens the transfers earlier letting more fuel in, so it increases the power and runs cooler.

I can't vouch for a company to buy from for your situation, but maybe I can give you some background. I recently went down the crankshaft path to figure out who really made what (but for P series).

First: Albero Motore or Alberi motore are Italian for crankshaft.

Below is Mazzy's official list of crankshafts for Vespa's:
https://www.nuovamazzucchelli.com/wp-content/uploads/2018/03/piaggio-alberi-a-motore.pdf

Possible options for you:
AMT-132
AMT-132 Race
AMT-133 (I think this is the modified P)
AMT-133/60 (I think this is the modified P)
AMT-135 (I think this is the modified P), I think this is a racy 133.

I think what you want is the AMT-132 RACE which I do not see on SIP's website. SIP relabels all the model numbers, but I still didn't see it.

I found it on some random Italian retailer's site, looks to have decent pics.
https://www.lavespadue.it/it/ricambi-accessori-per-vespa-ape/parti-motore/alberi-motore/albero-motore-mazzucchelli-amt-132-race-versione-racing-per-vespa-125-vnb-vba-gt-gtr-super-ts-150-vba-vbb-gl-sprint-veloce-super.1.25.1050.gp.13863.uw