Modern Vespa

three questions:

Does the taper on a rally 200 crank differ than that of the p series crank? I want to convert to a 12 volt non battery as was wondering why I have to purchase a new crank with a kit?

If I purchase a new crank, what suggestions do you have? I am not sure if I want a rotary or go reed valve down the road when I buy a mallossi 210. I am a little confused about full circle etc?

Lastly, can I convert my rally front end to a hyd. front disk brake system using my forks or do I have to trade for another type of fork? If so what vespa forks work?

Cheers Dave

What year? Late rally's are a P series motor.

If I understand correctly, you are suggesting that I DO NOT go with a reed valve system for the Rally casings. You would stay rotary unless I put in a P200 engine?

Having said that, what rotary crank would you suggest for a Malossi 210 setup with perf carb and exhaust? I am a little confused about the different types of Mazzi cranks out there.

The cases are basically the same, but good rally cases are harder to come by and reed conversion is permanent. You don't necessarily need to go reed, especially until you've done the other upgrades. Even then it's not essential.

If you want to go to a P200 stator (12v) you will need a P crank. It could be stock or cutback. Full circle cranks only work with reed setups.

For what it is worth, I would stay rotary until you're absolutely sure you need a reed setup to keep up with other upgrades. Again, you can never go back. If you decide to do it later on, you could sell your rotary crank.

The p cases and rally cases are not close to the same. Look at the difference in the fly side bearing. It is entirely different - which means an entirely different crank, stator and flywheel. Unless you find a custom bearing size that can mate a rally case to a p crank you are SOL.

Why do you need a new crank? What are you trying to gain from it... Strength? Rotary/intake size? Stroke?

I want to put in a new crank for two reasons:

1. I want to put in a 12 electronic ignition.
2. I want to put in a crank that is a decent set up for a malossi 210, bigger carb and perf exhaust.

What crank should I be looking at?

Switching to a P crank will also require a P flywheel to complete the 12V conversion. As I recall the T-5 fly side bearing works with the Rally case/P crank swap. Can't help with a specific crank suggestion.

to obtain the 12V ign you need several other components than just the crank-- there is a post here about all the parts required and what not.

any kit that you put on you're going to need to modify the cases-- something which i would NOT recommend doing to rally cases.

so really, you should be in the market for a P motor... you already want the 12V and you gotta hack the cases. just get a P2 lump and start there.

the only exception to the kit would be a superstock set up. you don't need to modify the cases for that.

you can put a hydro front disc on rally forks-- look at the worb5 website. but really, why would you want to? you'll still have crazy dive and shitty shock selection. go with a modified PK fork.

best,
-greasy