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Engine tear down, reassembly and tuning
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Link and Sync
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(Check the next two entries for photos)
Once the engine is assembled it's time to adjust the linkage. The object here is to synchronize the spark advance with the carburetor. You want it adjusted so the throttle plate on the carburetor just begins to open when the mark on the follower's cam is just to the left of the black plastic follower.
To determine when the throttle plate is actually opening, you'll need to attach an indicator to the throttle shaft on the carburetor. A simple and useful tool for this is simply an alligator clip with a slight nail, stick, or bit of wire attached. Clip this tool to the throttle shaft as indicated.
Once set up, simply advance the throttle slowly from full back until you just see the indicator move. Note the position of the mark on the cam in relation to the follower and adjust the cam in or out as necessary to correct. To adjust the cam, loosen the two bolts that hold it to the magneto plate with a 5/16" wrench.
Wear on the follower isn't a problem if it's not excessive and the magneto plate is tight. Check to see if the wear causes improper movement on the follower as you advance the throttle. If the wear groove is excessive or the cam pops into and out of the groove, replace the follower.
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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.
Outdoor Blog
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