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633GC OPERATOR’S MANUAL
23
P/N 70944 Jan 07 © 2007 ICS, Blount Inc.
CARBURETOR
• The function of the carburetor is to mix fuel with air.
Adjustments other than idle speed should be made by a
servicing dealer.
• Before adjusting the engine idle speed, make sure the air
filter is clean and the engine is warmed up.
T – Idle Screw is adjusted so that the engine idles smoothly
but the clutch does not engage.
• If saw has been running satisfactorily and there is a
gradual decrease in power and drop in RPM at full throttle,
the filter may have become dirty or saturated with water.
GUIDE BARS
• The bar is designed to be used on both sides. If the cut is consistently leading to one side, turn
the bar over to expose a new set of rails.
• A table mounted belt or disc sander can be used to square the rails of a worn bar. A badly worn
bar can quickly damage an expensive chain. If the chain is touching the bottom of the bar groove,
replace the bar.
• Check the guide bar for straightness. Minor adjustments can be made by bending the bar slightly.
• Proper chain tension will extend bar life. See page 9.
• Under some circumstances, especially low water pressure, the sprocket nose can wear out
before the guide bar body. Sprocket nose replacement kits may be purchased from an Authorized
Dealer (part #70249).
• Spray the chain and bar with lightweight oil for storage.
• Store bar with the sprocket nose up.
• Periodically clean the water ports inside the groove of the bar using a small diameter piece of
wire. Water port cleaners are available from an Authorized Dealer.
• The bar is solely a guide track for the chain. Never use the bar to lift, twist or pry concrete
material.
MAINTENANCE
Carburetor idle screw