Kit 77cc Ø50mm MALOSSI MHR BIG BORE aluminum scooter PIAGGIO liquid (NRG, RUNNER ...)

The famous kit MALOSSI MHR big bore! A monster of power and competitive technicalities. This kit is intended for racing origin (39.2mm) with a rod size of origin (80mm). Thanks to its diameter of 50mm, it offers 77cc real, to pass the cylinder which has a wide skirt for more solidity, you will have to machine the crankcases as follows:

The cylinder has an insertion diameter in the crankcase of 56.2 -0.1 / -0.2 mm . Therefore, it is necessary to ream the housing with a boring bar of 56.7 + 0.0 / 0.1 mm for a depth of 21 mm. MHR has released the great game, a beautiful polished frustoconical stud head which is aesthetically beautiful with its marks placed in 3D on the plot. The alloy and the treatment used are of the highest quality, really very strong, so it is ideal for the preparation / finish unlike the SIMONINI nykasil which peels off easily and is rather fragile. Its 50mm diameter piston is reinforced and made of aluminum base with high silicon content, silver treatment, slightly prepared on the back for better filling / sweeping, this piston is equipped with a reinforced 0.8mm KDN5 cast iron segment thick chrome domed. The cylinder has 7 transfers and a huge bar exhaust, the finish is excellent for a price so reduced on this type of cylinder. The transfer architecture is beautiful and really studied at best. The kit is of course delivered with the reinforced needle cage, reinforced studs, several base seals to adjust your squish as it should. This kit has huge diagrams, 196 ° for the exhaust which is barrette, 130,5 ° for the admission which is also in 7 transfers! With a compression ratio of 1: 50.50 (squish 0.50mm) it's a real performance missile. MALOSSI MHR following its tests announcement of this stock kit (not prepared) 26hp at 13,800 rpm. As much to tell you that the most part of the other kit have only to hold to check. Malossi has released this performance with a 28mm VHST carburettor, a yellow MALOSSI MHR SELLETTRA ignition, a big bore MHR exhaust, a RIDOLPHI air box, MHR flaps ... A fully equipped scooter set by professionals. So you can expect to reach with a complete equipment easily 24 hp real! As you can see, this kit is the most powerful of the market in normal race and its assembly / adjustment will require a lot of equipment, knowledge and a big budget. You will need to put a crankshaft worthy of the name! We advise MALOSSI MHR RHQ and POLINI evolution 2.

In option we offer a stage 1 preparation, this preparation is a modification of the channels and the exhaust light by increasing the diagrams and improving the pipe, it increases the performance of the cylinder. An improvement of the piston and skirt stocking is also included in this modification. Allow a little extra time for this preparation!

Installs on motor scooter PIAGGIO / GILERA Liquid 50cc 2 times:

APRILIA SR (carb) 50 2T LC 2004 (PIAGGIO engine)
ARPILIA SR R (carb) 50 2T LC (PIAGGIO engine)

DERBI GP1 50 2T LC
DERBI GP1 OPEN 50 2T LC
DERBI GP1 REVOLUTION 50 2T LC

GILERA DNA 50 2T LC
GILERA RUNNER SP 50 2T LC before 2005
GILERA RUNNER SP (carb) 50 2T LC after 2006 (C451M)
GILERA RUNNER 50 2T LC

PIAGGIO NRG EXTREME 50 2T LC
PIAGGIO NRG MC2 50 2T LC before 1997
PIAGGIO NRG MC2 50 2T LC after 1998
PIAGGIO NRG 50 2T LC
PIAGGIO NRG MC3 DD 50 2T LC
PIAGGIO NTT 50 2T LC
PIAGGIO NRG Power DD 50 2T LC
PIAGGIO QUARTZ 50 2T LC
PIAGGIO ZIP SP 50 2T LC after 2001
PIAGGIO ZIP SP 50 2T LC before 2000
PIAGGIO Zip sp2 50cc LC

And other models ...