2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 114Get this manual
Section 03 ENGINES (2-STROKE) Subsection 03 (593 AND 593 HO SDI ENGINES)
Maintenance
All Engines There are no wear parts anywhere in the system and there are no adjustments to be periodically checkedThe only possible maintenance required would be cleaning of carbon deposits from the guillotine slideCleaning intervals would depend upon the user's riding style and the quality of the oil usedBRP suggests annual cleaning of the valveIf customer uses lower quality oil, than recommended, more frequent cleaning may be requiredNo special solvents or cleaners are required when cleaning the valveOn SDI models, check if solenoid heating element is still functional once year, the element should be warm after one minute of riding (measure should be between 0.0 to 0.4 ohms)At the same time, using vacuumpressure pump (PN 529 021 800), check if crankcase check valve is still functionalNOTE: Make sure hoses are not kinked or damaged