Setting Of The Exhaust Valve Timing (125 Max Only) - Rotax 125 MAX Installation Instructions And Operators Manual

6) Setting of the exhaust valve timing
(125 MAX only)
General
Graphic
Motorleistung [kW],
performance of engine [kW]
22
20
18
16
14
12
10
Leistungskurve 1
8 performance graph 1
6
4
2
0
Effectivity: 125 MAX/Junior MAX/Mini MAX/Micro MAX
Edition 1/Rev. 0
CAUTION
WARNUNG
Engine performance graph will differ with a closed (performance
graph 1) or opened (performance graph 2) exhaust valve. The
best performance characteristic of the engine will be achieved
when the opening time of the exhaust valve is at the intersection
of the two performance graphs.
If the exhaust valve opens too soon, the engine acts as per per-
formance curve 2 (for open exhaust valve) which gives less per-
formance at this rpm range, and you loose performance and
acceleration potential.
If the exhaust valve opens too late, the engine acts as per perfor-
mance curve 1 (for closed exhaust valve) which at this rpm range
gives less performance, and you loose acceleration potential.
The engine reaches maximum performance even with the ex-
haust valve wrongly adjusted, but you loose performance and ac-
celeration potential.
Leistungsverlust bei falschen Schieberöffnungspunkt
Performance loss at wrong exhaust valve timing
optimaler Schieberöffnungs-
zeitpunkt
optimum valve opening point
Schieberöffnungs-
zeitpunkt zu früh
Valve opening too
early
Schieberöffnungs-
zeitpunkt zu spät
Valve opening too
Motordrehzahl [1/min.], engine revolutions [rpm]
Fig. 11
BRP-Powertrain
The exhaust valve adjustment must never be
done during operation on the track.
late
Leistungskurve 2
performance graph 2
K00266
page 2-35
February 01/2014