Ski-Doo Ski Doo MX Z 2005 [900/1429] Engine does not offer maximum power and or does not reach maximum operating rpm

Ski-Doo Ski Doo MX Z 2005 [900/1429] Engine does not offer maximum power and or does not reach maximum operating rpm
Section 02 TROUBLESHOOTING GUIDE
Subsection 02 (ENGINE (4-TEC))
Symptom: ENGINE SUDDENLY TURNS OFF. (contd)
6. Melted and/or perforated piston dome; melted section at ring end gap.
- Spark plug heat range is too hot. Install recommended spark plug (refer to TECHNICAL DATA).
- Coolant less than recommended level (engine gets too hot). Repair cooling circuit and/or refill
with recommended liquid.
- Poor quality and/or wrong fuel. Clean from contamination and use appropriate fuel (refer to
TECHNICAL DATA).
7. Piston color is dark due to seizure on intake and exhaust sides.
- Cooling system leaks and lowers coolant level. Tighten clamps or replace defective parts. Add
antifreeze in cooling system until appropriate level is reached. Replace damaged parts.
- Oil nozzle is clogged or bent. Clean or replace oil nozzle (refer to LUBRICATION SYSTEM).
8. Cracked or broken piston.
- Cracked or broken piston due to excessive piston/cylinder clearance or engine overreving. Re-
place piston. Check piston/cylinder clearance (refer to CRANKSHAFT/DRIVE GEARS).
9. Check piston rings and cylinder surface for grooves.
- Poor oil quality. Use recommended oil.
- Contamination through engine intake. Replace defective part(s) and use new air filter.
10. Check valve springs exhaust/intake.
- Broken valve spring damages the cylinder head, valve(s), rocker arm(s)/piston/ piston rings and
connecting rod. Replace defective part(s).
11. Check crankshaft, rocker arms movement.
- Oil pump failure due to leack of oil. Repair and replace defective parts and use recommended
oil.
- Oil contamination due to clogged oil filter/oil sieve. Replace oil and oil filter at the same time,re-
place defective part(s) (refer to MAINTENANCE CHART and LUBRICATION SYSTEM).
Symptom: ENGINE DOES NOT OFFER MAXIMUM POWER AND/OR DOES NOT REACH
MAXIMUM OPERATING RPM.
1. Check spark plug condition and/or gap.
- Fouled spark plug or wrong spark plug gap. Readjust gap or replace.
2. Check spark plug type.
- Improper spark plug heat range. Install recommended spark plug (refer to TECHNICAL DATA).
3. Check fault codes in B.U.D.S system.
- Check if electrical actuator(s) is/are defective. Replace defective part(s) (refer to COMPONENT
INSPECTION AND ADJUSTMENT).
4. Check for water in fuel (wrong fuel).
- There is water in fuel or wrong fuel. Drain fuel system, search for leakage and refill it with ap-
propriate fuel.
5. Check engine compression.
- Worn piston(s) and/or piston ring(s). Replace (refer to CYLINDER AND HEAD).
6. Check fuel pressure.
- Low fuel pressure. Perform fuel pressure test (refer to COMPONENT INSPECTION AND AD-
JUSTMENT).
22 mmr2005-020

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