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Engine tear down, reassembly and tuning
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Assemble the crankcase
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Screw in all the main bolts and periphery bolts, but just snug them. Then install the two tapered pins by driving them tight with a punch to align the crankcase halves.
Torque the main bolts in three rounds. Start with the centre bolts, then the uppers, and finally the lowers. Do the first round at 35 inch/lbs, second at 50 inch/lbs, and the final round at 70 inch lbs on all the bolts. Then tighten the periphery bolts. If you wish to torque these, they get 70 inch/lbs as well but there's no need to tighten them in three rounds.
Drip a little 2-stroke oil into the crankcase to lubricate the centre and bottom main bearings. Set the flywheel and flywheel key on and turn the engine over, feeling for any tightness or binding.
If all is well, install the reed cage and manifold, but not before carefully examining them to make sure they're perfectly clean. Replace the gaskets if they're torn. The reed and manifold bolts may be torqued to 70 inch/lbs if you wish.
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All projects on Shareaproject.com are user-submitted and should be used for reference information only. The projects are not intended to be complete "How-To" articles. Use the information contained in these projects at your own risk. Projects are not checked for completion, accuracy, or safety and therefore cannot be guaranteed in any way.
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