Minarelli V2

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This is a variated version of the Minarelli V1. They can be identified easily by the large belt driven rear pulley on the right hand side of the engine. The front pulley is hidden under an aluminum cover that also houses the starter clutch assembly.


What makes a V2 a V2?

They are the same in many ways to their non-variated brethren.

  • The cylinder, head and piston are identical to that on the V1.
  • The fan and fan cover/air conveyor are the same.
  • The flywheel and stator assembly is the same. Mine is a CEV 6932 flywheel, but others might have been used.
  • The exhaust system is the same, but if you are thinking of adding a new pipe, keep the rear pulley clearance in mind.

But they are different in some crucial areas.

  • The case halves obviously
  • The starter clutch is located outside of the case and uses non-identical components.
  • The clutch is way different, closer to a Batavus design[1].
  • The crankshaft is different and is rumored to be exceedingly difficult to find.
  • The V2 has slightly different engine mounts than the V1, making a simple bolt-on conversion impossible. Some clever welding would alleviate the problem however.

The transmission is a dual variated, belt driven CVT, similar in design to many mopeds and scooters. It uses springs and weights to change the shape of the pulleys in tandem, which changes the gear ratio while keeping belt tension[2].

Maintenance and repair

Here are the bearing and seal sizes courtesy of mikerafter. They are measured in mm. Inside diameter X outside diameter X width.

  • Crankshaft bearings: 17x40x12(same for both sides)
  • Seals: 17x35x8
  • Rear pulley bearing: 30x55x13
  • Seal: 30x47x7
  • Pedal shaft left side seal: 15x24x5
  • Pedal shaft right side seal: 16x24x5
  • Transmission right side bearing (in case no seal): 12x32x10
  • Drive sprocket bearing: 15x35x11
  • Seal: 15x24x5

The centrifugal clutch is a circular spring filled with ball weights, located on the front pulley, just behind the starter clutch. Since it is so similar to the Batavus clutch, it is possible to do the same mod described in the Batavus performance article(removing weights to increase the RPMs at which the clutch engages). I have tried this on my clutch and it seems to work well.

The starter clutch uses a small cup filled with bearings that occasionally needs greased. To access it, remove the two hex screws that hold on the front pulley cover. BE VERY CAREFUL HERE, because those little ball bearings like to fall out and disappear. Once it's off, just remove the bearing cup inside the cover, clean and grease everything.

To check the oil level, you must remove a screw underneath the drive sprocket. If oil comes out of the hole, you're good to go. It takes approximately a pint of SAE 20W oil. Check the pictures for more details.

The belt used is size A-26 on stock setups. If the rear pulley has been changed, it will be a different size.

Availability

V2 engines are rare compared to V1s. They are not readily available for sale in any condition, which makes it difficult to pin down a price. Some sales of complete peds with V2s have taken place on the Buy+Sell forum.
Although they are rare, and there is often a lot of slavering on the boards when they show up, it is important to keep realistic expectations. Don't expect the world to be beating your door down with clubs made of rolled up fifties. Their low parts availability makes them somewhat less than desirable for modders who may be goosing them to the breaking point and there are plenty of other engines out there that will power a ped just as well.
If you manage to find one, congrats, you just got a sweet motor that will perform with typical Minarelli grace and reliability.



Engines mounted on peds


Resources

I got most of this information from the forums. If it is wrong, please correct it. If your pictures are here and you don't want them to be, please remove them.
Forum post: V2 Owners?
Forum post: V2 motor explored