Tips on rebuilding your snowmobile engine

[harleysportster]

-follow a service manual for any type of repair
-replace worn parts
-replace gaskets,seals
-check the engine ring end gap, minimun of .012
-tighten hardware to proper torque specs(use lock-tite where needed)
-pressure test the engine before startup
-clean entire carb spotlessly( all jets and pasage-ways)
-follow factory specs for carb jetting
-check ignition timing
-install the correct spark plugs
-use the correct octane rating in the gas(see octane post in FAQ section)
-retorque engine head bolts before starting, warm engine(10-20 min.) and let it cool, and retorque the head bolts again.
-From '73 on, mix the gas at 40:1 for the first tankfull when re-ringing or new pistons were installed, then mix as normal at 50:1
-during break-in, don't run the engine wide open for extended times, you want to vary the throttle.
-check the color of the spark plugs frequently(cardboard color=normal, white=lean,black=rich), running lean will cause severe damage

[guitardude081]

Also...
-On oil injected models make sure to bleed oil pump how it says to in the book
-On liquid cooled motors make sure to check coolant level after it has been run
-Don't forget to connect your impulse line
~Jack