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Old 28 Jun 2011, 09:01 pm
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Default 1982 honda magna wont idle:help?

I left my bike for about 3 weeks in the garage and when I came back it would not stay on unless I held the throttle down.As soon as I let go in a minute it shuts off. It has almost a full tank of gas and the oil has been recently changed. It also just passed inspection. I have no idea what to do next.
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Old 28 Jun 2011, 09:16 pm
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Adjust the valves, check compression... looking for about 175 psi. If good, then move onto































Ignition system... Remove points plate, check function and lubricate the mechanical spark advancer.















Replace point plate and check point gaps, when the points are opened at the widest part of the points cam ramp. Set gap to .014-.016 after you have cleaned the point contact faces to nice shiny surface with no grit or debris left behind. Rotate crankshaft to F mark and using a 12v test light watch when the points on the right side just begin to open (light comes on). If the F marks are not where the light turns on, loosen and rotate the points plate until it does and then go back to check the point gap again, to ensure that it hasn't changed beyond specifications. Then do the same thing with the left points and the LF timing marks.































NOW the fuel system.































There are NO adjustment screws inside the carburetors. You have external idle mixture screws, which are set about 3/4 to 1 turn out from lightly seated. The other two screws are for the idle speed adjustments on each carburetor.































Due to age and unknown history, you probably should remove the carburetors for cleaning and replacement of the o-rings. The idle jets are probably plugged which makes the engine hard to start and then it won't idle if you want it to afterwards.































The carb diaphragms need to be inspected for tears or pinholes. I am assuming that you have an SL350K0, as the K1 carbs are totally different. If the intake manifolds are cracked/torn, you will have to replace them, as well.































With the ignition timing dialed in and cleaned carbs, it should fire up fine, assuming that the engine is sound to begin with.































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