ENGINE
2.7
V.E.S. Maintenance
Due to the simplicity of V.E.S. design, maintenance is limit-
ed to a periodic inspection and cleaning of system compo-
nents. The V.E.S. should be disassembled, inspected, and
cleaned (remove carbon deposits) every 1000 to 2000
miles, depending on operating conditions. To ensure maxi-
mum performance and minimize required maintenance,
Polaris recommends the use of Polaris Synthetic 2 Cycle
lubricant only. The use of other lubricants may cause im-
proper function of the valve mechanism, and increase the
frequency of required cleaning due to excessive buildup of
carbon deposits.
V.E.S. Removal and Cleaning
Removal and cleaning is covered later in this chapter.
V.E.S. Troubleshooting
Symptom Possible Cause Remedy
Engine will not reach
designed operating RPM
Valve not opening or not opening completely:
1. Exhaust valve sticking
2. Cylinder pressure feed port
restricted
3. Bellows damaged or not sealing
correctly
4. Incorrect spring
5. Problem in clutch setup, drive
line, engine, etc.
1. Remove carbon deposits,
burrs etc.
2. Clean port
3. Inspect bellows, fastener
straps, and gasket and
repair as required
4. Inspect
5. Inspect
Poor acceleration;
hesitation; High RPM
performance is normal or
near normal
Valve opening too early:
1. Valve sticking open or partially
open
2. Broken, damaged, or incorrect,
spring
1. Clean, Inspect
2. Inspect, Replace
Adjuster nut
O-ring
Bolt
Valve cover
Spring
Valve cap
Bellows
Washer
Valve housing
Dowel pin
Gasket
Valve
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