Here is one of the best quality / performance / price ratio on the market The 70cc ATHENA Racing high engine kit is an excellent compromise. With its diameter of 47.60mm, it offers the actual displacement of 71.18cc in combination with the original 40mm DERBI race. The cylinder is aluminum, it has 5 transfers of admissions and a huge exhaust bar, aluminum and treatment are at the height of reputation ATHENA, high quality.
The channels are very well worked, it preserves a base almost identical to the origin, an alignment cranks will not therefore be mandatory. The piston is a flat model, treated and high silicon content, it obviously has a single segment chrome end hard curved to allow very high speeds. The cylinder head is decomposable (in 2 part), to allow a better cooling but also allow more experienced to turn the bolts of different breech! The room is frustoconical, polished finish.
This group offers a compression ratio of 13.5: 1 with the recommended squish of 0.80mm. Several joints are obviously provided for you to make your squish, as well as a very good explanatory note. This cylinder preserves a very good couple but also offers a lot of high speed and power!
Really a very large solid and powerful cylinder to accompany a good equipment. We highly appreciated the degree of finish on this cylinder, also the quality of materials or the machining with lip that allows the combustion chamber not to shift from the cylinder during tightening / assembly.
We recommend to accompany this kit with at least : exhaust racing, crankshaft and reinforced bearings (game C3 / C4), carburation 21mm minimum and 26mm to operate well, ignition well released ...
The pack contains :
X1 cylinder 5 transfers exhaust barrette treated nikasil
X1 segment chrome hard curved pre-honed d.47,6mm X 1mm
X1 reinforced piston pin Ø12mm
X2 piston clips type C
X1 flat piston high silicon content
X1 complete seal pack
X1 cylinder head cover
X1 breech block
X2 muffler fixing studs
X1 notice
X1 sticker
Spare parts :
Segment
Piston
Pack attached
Piston clips type G
Piston pin + clips
Cylinder cover
Cylinder block
Optionally we offer a stage 1 preparation, this preparation is a modification of the exhaust port by increasing the diagrams and improving the pipe, it increases the performance of the cylinder. An improvement of the bottom of skirt is also included in this modification. Allow a little extra time for this preparation!
This high engine mounts on the 50cc motorcycles with gearboxes equipped with the DERBI Euro1 and Euro2 engine:
BULTACO Astro enduro 50cc
BULTACO Lobito supermotard 50cc
DERBI GPR 50 Nude before 2004 (EBS050)
DERBI GPR 50 Racing before 2004 (EBS050)
DERBI GPR 50R Replica year 2001 to 2004
DERBI GPR 50cc year 1998 to 2001
DERBI Senda 50cc before 2000 (tubular frame)
DERBI Senda 2000 50cc before 2004 (perimeter frame) Euro2
DERBI Senda DRD supermotard before 2000 (tubular frame)
DERBI Senda DRD supermotard before 2004 (perimeter frame) Euro 2
DERBI Senda Enduro before 2000 (tubular frame)
DERBI Senda R DRD Enduro before 2000 (tubular frame)
DERBI Senda R DRD Enduro front 2004 (perimeter frame) Euro2
DERBI Senda SM before 2000 (tubular frame)
DERBI Senda SM before 2004 (perimeter frame) Euro 2
DERBI Senda X-Race 2000 before 2004 (perimeter frame) Euro 2
DERBI Senda X-Race Trail before 2000 (tubular frame)
DERBI Senda X-Trem Enduro before 2000 (tubular frame)
DERBI Senda X-Trem Enduro front 2004 (perimeter frame) Euro 2
DERBI Senda X-Trem SM before 2000 (tubular frame)
DERBI Senda X-Trem SM before 2004 (perimeter frame) Euro 2
GILERA GP Replica 50cc
GILERA GSM 50cc
GILERA HAK Euduro 50cc
GILERA RCR Euduro 50cc (tubular frame)
GILERA SMT SM 50cc (tubular frame)
GILERA Sioux Enduro 50cc
GILERA Zulu Enduro 50cc
And many other models ...
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