Malossi VR-One for Vespa PX 80/125/150 and derivatives
Malossi VR-One for Vespa PX 80/125/150 and derivatives

Continuing the rapid development of the aftermarket engine casing market for classic scooters, Malossi have introduced a pair of new Vespa Largeframe engine casings, this time with the crankcase mouth and studs to suit the kits for 80/125/150 engine casings.

Typically for a Malossi product, the casings are not straight remakes of the Piaggio design but feature the same list of upgrades as their casings for the 200-block Vespa. The casings are made in Italy and come supplied with engine mounts and all required fasteners and studs.

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These technical changes include:

  • Precise machining of the main crankcase mating faces so that a gasket is no longer required, only sealing with a high quality gasket cement.
  • Closure of the casing with recessed screws instead of nuts and bolts.
  • Extensive reinforcement of the engine casing in the typical Vespa weak points.
  • An upgrade of flywheel bearing on the reedvalve version from the traditional Vespa needle roller bearings to a 25-62-12 ball bearing in order to improve the engine’s ability to cope with sustained high rpm.
  • Pre-machining the transfer cutaways in the crankcase mouth to match the latest breed of Malossi kits for the 125/150 engines so that assembly is largely ‘plug and play’
  • Adoption of the 200-size engine rubber mounts which are much easier to renew than those used in the early 125/150 motors.

Malossi V-One engine mounts
Malossi V-One engine mounts

Like the bigger brother, two versions of the 80/125/150 casing are offered. The V-One Sport version is rotary valve, while the VR-One MHR version is reedvalve and designed to take dedicated Malossi reedvalve crankshafts. Prices are €790 for the rotary and €895 for the reedvalve one including the reedblock and inlet manifold to suit a 30mm PHBH carb.

Overall the V-One looks like a great engine casing replacement for a worn or damaged Vespa 125/150 casing. It is adaptable to all your old engine internals including electric start. With the VR-One pretty much all the bottom-end tuning work is done once you buy the correct crankshaft, making it much simpler to assemble a tuned engine. Malossi produce both 57mm and 60mm stroke cranks to suit and kits to match including the recent 63mm MHR aluminium kit with its distinctive bolt-on steel exhaust stub…

Malossi MHR kit for PX in 63mm diameter.
Malossi MHR kit for PX in 63mm diameter.

From Malossi’s perspective it makes perfect sense to produce this casing and offer the same technical advancements to the smallblock engine as they did with the largeblock. It’s essentially the same product with different crankcase mouth machining.

From a customer point of view, if you already have a garage-full of PX125/150 tuning parts then in theory you could use them all on this casing. However if you were buying a new casing to build from scratch with a full compliment of Malossi tuning parts, then why wouldn’t you just get the Malossi 200-block instead and start with that?

Maybe I’m just greedy 🙂

New Malossi cast iron sport kit for PX casings
New Malossi cast iron sport kit for PX casings

New Cast-I-cylinder 63mm for PX125/150 and LML Star

By small coincidence, Malossi refreshed their cast iron kit for the PX smallblock engines to a revised version offering 178cc when fitted to an engine with the stock 57mm crankshaft.

At €230 + tax it is roughly half the price of the aluminium MHR kit for PX so it is really budget-friendly.

Porting has been revised with improved transfer port shapes and slightly longer exhaust port timing than the old cast iron kit.

This new kit also benefits from a fully revised cylinder head with greater cooling fin area and a dowelled connection between the cylinder head and barrel with an O-ring seal. The piston is also new and set for a slightly tighter piston to bore clearance to reduce engine noise.

Malossi say the kit will produce between 14 and 22hp depending on set-up. It is pictured with some alternative main jets for the standard carb but Malossi recommend between 24-30mm carbs.

Malossi Power Up Vespa clutch
Malossi Power Up Vespa clutch

Malossi Power Up Vespa Clutch

Again, in a world of expensive upgrades Malossi are offering some more budget alternatives including in the clutch sector. The Power Up clutch is essentially a banded-basket solution for PX125 6-spring and PX200 &-spring style clutches with four friction plates.

There’s nothing particularly fancy about this design, but also supplied are a second set of auxiliary springs that may be fitted to ‘double-up’ on the spring pressure for engines making high horsepower.

According to Malossi the design of key components has been adjusted to reduce annoying transmission rattle.

The retail prices for these clutches range from €135 to €140 + tax.

Find out more about Malossi here.

Words and photos: Sticky

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