Vortex ROK DVS JUNIOR, Owner'S Manual

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4. SERVICING YOUR ENGINE
Good maintenance is essential for safe, economical and trouble-free operation. Here you will find
a maintenance schedule for your engine. Routine inspection procedures are very simple by using
basic tools. Some service tasks that are more difficult or needs special tools must be performed by
Vortex technicians or qualified mechanics.
Timing schedule periods are only indicative.
4.1. Maintenance Schedule Guide and Adjustments
Carburettor Cleaning After every race/heat
Throttle Cable Check Every race
Spark Plug Check
Change Every Race
After 30 hours
Exhaust Internal cleaning Every 10 hours
Piston Change Up to 30 hours
Chain Change After 10 hours
Cylinder Honing Up to 30 hours
Connecting Rod Change After 60 hours
Bottom End bearings Check/Change After 30/60 hours
4.2. Torque Chart
Cylinder Head Ø 8 mm Nut 18 Nm
Exhaust Manifold Ø 6 mm Bolts 12 Nm (Use threadlocker)
Crankcase Ø 6 mm Bolts 12 Nm
Ignition Nut 28 Nm
Ignition Ø 5 mm Bolts 8 Nm
Nylon crankshaft stuffer 8 Nm (Use threadlocker)
4.3. Sizes and Measures
Tolerance Cylinder/Piston
JNR
0
.
1
2
mm
Timing Snr DVS
2
.
5 mm
Timing Jnr DVS 3
.
0 mm
Piston Sizes
W10140/
DVS
54
.
00
W10143/
DVS
54
.
03
W10146/
DVS
54
.
06
W10149/
DVS
54
.
09
W10152/
DVS
54
.
12
W10155/
DVS
54
.
15
Tolerance Cylinder/Piston
SNR
0
.
1
3
mm
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