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A very good ratio between torque, power, and price stability.
Attention parts only reserved for the competition, prohibited on road!
Here is the best value kits 70cc aluminum market. This is the AIRSAL 70cc Ø47,6mm. This cylinder cheap does not neglect quality and on the contrary, it is 47,6mm diameter high-quality aluminum. It has 6 transfers of admission (4 side and 2 rear) and a big exhaust with bar. 
Charts are pretty high at admission and low enough to escape making the torquey and not difficult to follow or set. The piston is a two-segment model with side grease! Accompanied by his shaft diameter Ø12mm X 38mm in length, its 2 clips in G and its 2 segments chrome for 1mm thickness. 
Clearly this kit has a very good ratio torque / power, it offers plenty of performance while preserving a great strength! The finish is really on top. We advise you to align transfers to lower casings engine. 
The cylinder head high compression hemispherical room polished finish, the chamber is incoming to have good alignment chamber / cylinder is a good performance head gaskets. This cylinder head allows you to reconnect if desired antifreeze on your carburetor. It will certainly be less effective than MALOSSI MHR, BIDALOT or Polini ... But there will already very good. 
We recommend to accompany this kit with minium: 19mm carburetor (lamellae valves 0.30mm or 0.35mm carbon), crankshaft and reinforced bearings, exhaust racing, cold candle racing ...
The pack contains:
X1 aluminum cylinder 6 transfers with big exhaust barrette
X1 cylinder head high compression incoming chamber
X1 Piston Ø47,6mm with side grease
X2 Segment 1mm thickness chrome purposes
X1 Piston Pin Ø12X38mm
-2X Piston Clips G
X1 Full seals Pack
X1 Bag of fasteners (bolts, anti-freeze, hose connection ...)
X1 Instructions ...
Optional we offer a preparation course 1, this preparation is a modification of the channels and the exhaust port by increasing the charts and improvement of the duct, it increases the cylinder performance. Improved piston and bottom skirt is also included in the amendment. Allow a little extra time for this preparation!
Installs on motor scooter PIAGGIO / GILERA 50cc 2-stroke liquid:
Aprilia SR (carb.) 50 2T LC 2004 (Motor Piaggio)
ARPILIA SR R (carb.) 50 2T LC (Piaggio engine)
Derbi GP1 50 2T LC
Derbi GP1 OPEN 50 2T LC
Derbi GP1 REVOLUTION LC 50 2T
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 50cc LC sp2
And other models ... 
Reference: 040630476
Ideal to refurbish your 70cc AIRSAL Luxury bi-segments, incoming high compression chamber.
Reference: 060630476
The replacement piston for AIRSAL Luxe bi-segment 70cc Ø47,6mm cylinders.
Reference: 110630476
Replacement ring set for your kits 70cc two-segments with exhaust with bar AIRSAL.
Reference: 140630476 - 140621476
Ideal for refurbishment guarantee leak-free!
Reference: 140.0183
A torquey and solid kit, ideal for everyday use.
Reference: 57805.00
The large diameter BIG BORE kit from PARMAKIT !
Reference: 57575.00
The direct competitor of the MALOSSI MHR REPLICA 70cc!
Reference: 3112044
Engine kit with reprogramming unit for PIAGGIO engines direct injection 50 2T.
Reference: 9929800
Very powerful kit with two-part stud bolt for PIAGGIO / GILERA liquid 50 2T in the original race.
Reference: 3115901
The famous 7T MHR TEAM 70cc for PIAGGIO , GILERA , DERBI and APRILIA . What power! What torque and what strength!! One of the best normal races on the market!
Reference: 31 8466
A kit certainly a little less powerful than a team but that can surprise more than one.
Reference: 082500
The RACING version of the kit ATHENA 70cc for scooter PIAGGIO, robust but very high performance! High quality for a fairly low budget.
Reference: KT00097
Ideal for increasing your performance dramatically while maintaining excellent strength and engine reliability.
Reference: EQ-783
The famous big diameter in cast iron from BARIKIT for scooter drives PIAGGIO / GILERA lc. An excellent quality / price ratio with stud bolt, 6 transfers, booster exhaust ....
Reference: 9920590
A high engine 100% complete very nice aesthetically, model "DUE PLUS" fully painted in light blue, 6 transfers, large oval exhaust outlet, piston mono segment, cylinder head high compression ...
Reference: 140.0207
The must of 70cc on the market PIAGGIO liquid engine.
Reference: 140.0183/R
A model above the corsa model because it is hand retouch for more power while maintaining excellent reliability.
Reference: 57800.00
The direct competitor of the MALOSSI MHR and the EVOLUTION 70cc!
Reference: 30430.M
Although little known in FRANCE, LUXEMBOURG, SPAIN ... This kit is all the rage in Italy, the small SIMOININI for normal race is simple, solid and gives a great couple!
Reference: 010621476
Kit 70cc powerful that is between the luxury and T6 AIRSAL but its cheap.
A very good ratio between torque, power, and price stability.
