It is fitted with a short base spark plug like the B9HS for example.

Many of you asked us for it, so we did. Here is the RRD Ø47mm high compression cylinder head for av7 engine equipped with a 75cc kit in diameter 47mm. This cylinder head to couple well at the time of the MOTOBECANE AV7 engines, to the intake without valves of the latter and its architecture .... Old model with "high" engine mounting.

chambre volume culasse 47mm av7 motobecane av44 88 In addition to this, you need to know more about it.
In addition to this, you need to know more about it.

Our cylinder head preserves a chamber like the original cap. It also preserves an original aesthetic appearance. It is a 40mm base cylinder head, fully digitally resurfaced for perfect planning, controlled, and with a chamber specifically passed to 47mm with a calculated angle. It will offer maximum performance to your high 47mm diameter motor!

culasse rrd 47mm kit 75cc motrobecane av7 In addition to this, you need to know more about it.
In addition to this, you need to know more about it.

We recommend it with SP98, a 0.9mm squish (you can go down to 0.7mm or go up to 1.1mm depending on the performance you are looking for). The finish of the room and the planning is obviously excellent. The price may seem high, it is however low in view of the work carried out on these cylinder heads digitally in small series, the adjustment is complex.

culasse RRD haute compression chambre casquette chaudron cylindre 47mm 88 av44 av7 In addition to this, you need to know more about it.

During the planning, increase of the compression and recovery of the angle, of the diameter of the chamber, we also had the RRD logo digitally affixed.

HUTCHINSON 2 3/4 17 inch inner tube, straight valve