Technical information

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CHAPTER

PAGEISSUE

TWO-STROKE ENGINE AM6

ENGLISH

SECTION 3

C - ENGINE

Minarelli Engine

SECTION 2

F.29F. 28

F.31F.30

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PREVENTIVE CARE

1) WASH the two crankcases and the bearings with petrol and blow them with compressed air, checking that the

bearings run freely and noiselessly.

CAUTION: if it should be necessary to replace a bearing, the seat must be heated before installing

the new bearing.

2) MAKE SURE the connecting rod is in perfect working order and check for faults, especially in the bearing

seats. Make sure assembly on flywheel side has been properly accomplished. Using a comparator, check the

eccentricity of the two connecting rod axle shafts. The maximum eccentricity value must not exceed 0.04

mm. On the contrary, centre accordingly. Make sure the connecting rod is perpendicular.

3) MAKE SURE the transmission is in perfect working order and fit the shim washers in the right positions.

If you have replaced components, make sure that they are put in the same positions as the parts removed and

that the end float does not exceed 0.1 mm. To obtain this condition, measure the distance of the shim

washers on the crankcase and components, and fill any gaps with other shim washers, as shown in the photo

(F.28).

4) CHECK the distance of the shim washer of the desmodronic shaft both on the crankcase and on the part, and

fill any gaps with other shim washers, as shown in the photo (F.29).

The end float must be less than 0.1 mm.

5) CHECK the distance of the shim washers of the shift shaft both on the crankcase and on the part, and fill any

gaps with other shim washers, as shown in the photo (F.30). The end float must be less than 0.1 mm.

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