Engine Suspension On Chassis; Attachment Via Engine Pedestal; Direct Attachment Of The Engine On Chassis; Fitting Of The Drive Chain - Bombardier-Rotax FR 125 MAX FR 125 Junior MAX Installation And Operator's Manual

Installation Instructions FR 125 MAX and FR 125 Junior MAX

4. Engine suspension on chassis

4.1. Attachment via engine pedestal

Using an engine pedestal for the ROTAX engine FR 125 MAX / Junior MAX / Mini MAX, the engine
is inclined at 0° to 15° in the driving direction.
Drill 4 holes (8,5 mm dia / 0,315 in = drillsize 0) on the coordinates 80 mm x 102
mm / 3,15 in X 4,016 in in top plate of the pedestal suitable for the chassis.
Warning: When drilling the holes in the pedestal pay attention to advice of the chassis
manufacturer.
Connect pedestal with engine crankcase by 4 screws M8 (min. strength grade 8.8).
Secure screws with supplied securing and sealing agent ERGO 4052. Tighten
screws to 24 Nm / 212 in lb.
Note: Engaged thread length in crankcase to be between 16 / 5/8 " - 24 mm / 1 in.
Warning: Pay attention to chain alignment as advised by chassis manufacturer.
Note: Do not fasten engine on chassis until chain is in position and properly aligned and
tensioned.

4.2. Direct attachment of the engine on chassis

If the frame of the chassis was specially prepared for installation of the ROTAX engine FR 125
MAX, then 2 sheet metal brackets with oblong holes are welded on the two frame tubes. Between
the two brackets the engine is clamped with two bolts. The correct chain tension is reached by
shifting the engine along the oblong holes. Since engine installation is without the pedestal, the
centre of gravity of the engine will be lowered by approx. 3 cm. No need for aligning the engine in
regard to the chain flight as the correct alignment is already provided by the brackets welded on
the frame tubes.
Place engine between the two attachment brackets. Attach engine on frame with 2
bolts M8 of appropriate length (minimum strength grade 8.8) and 2 lock nuts.
Note: Do not fasten engine on chassis until chain is in position and properly aligned and
tensioned.

5. Fitting of the drive chain

The required length of the drive chain depends on chassis and transmission ratio and the chain is
therefore not included in the supply volume of the engine.
Use a chain with the length corresponding to the selected transmission ratio of
dimension 7,75 x 4,6 x 4,5.
Place chain on sprocket at the clutch and on the sprocket on rear axle.
Verify chain alignment between front and back chain sprocket with a straight edge.
Correct as required by shifting sprocket adapter along rear axle.
Seite/page 61/108 Ausgabe/edition 09.2003