To avoid damage, follow proper break in procedures!
Proper Break-in and Assembly
When you receive your parts back, make sure you properly clean everything and know how to assemble it. If not, give us a call and we’ll help you out. Make sure all your parts to be assembled are lubricated with oil. Before starting your motor, take an oil gun and shoot oil into the inlet spigot of your oil pump; while a friend of yours is turning it over. When oil flows through the outlet spigot, the motor is primed and ready to start. After running your motor from 5 to 8 minutes, shut it off and tighten all the bolts; especially head and barrel bolts, because all the gaskets compress when heated up. Always use straight weight air cooled motor oil. I recommend Penzoil air-craft oil wintertime = 50 weight. Spring and fall = 60 weight. Summer 70 weight (for shovel, pan & early shovel) EVO highest oil weight is 60 - summer straight weight only.
When breaking in a new motor, make sure your ignition timing is right on factory specs, not advanced or retarded. It is always better to have your carburetor a little richer than normal because that keeps the motor cooler. The first 100 miles is critical!! After 100 miles, change the oil, tighten all the bolts and readjust your pushrods.
Always adjust your pushrods when the motor is warm. Adjust them with n~ up and down play - only a slight drag when you turn them. This will eliminate all ticking sounds.
Do not let your motor idle for a long time, it will overheat and score the pistons. Ride no faster than 55 mph or 3500 rpm’s for the first 500 miles.
Scored up pistons, can be caused from:
1. An overheated motor due to running it hard
2. The timing of the motor was off
3. The fuel mixture was too lean
4. An air leak coming through the manifold 0-rings
5. No oil or oil lines hooked up wrong
6. Intake pushrods were too tight, keeping the intake valve slightly open If you follow Dragon’s Tech Tips on proper break-in and assembly, you’ll have a great long lasting running motor.