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What are the gap specs for points and fly wheel to mag on a 4hp b&smotor

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15 thou on points and 8 thou on mag. Regards Phil

Posted on Apr 11, 2011


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It not starte

For the saw to start it needs 3 things. 1. fresh fuel. If the fuel it is older than 2 months dump it out and put in fresh fuel. Next it needs air. Check the air filter. If you hold it up to a light you should be able to see light through it. If not clean or replace it. Last it needs spark. Pull out the plug and let it touch the saw so it makes ground. Pull the starter cord and you should see the spark jump the gap in dim light. If no spark the points and /or the condenser have failed. They are under the flywheel. You will need a fly wheel puller to get to those. To remove the fly wheel you must take off the nut. To do this must keep the fly wheel from turning. I have stuffed some rope that will not shed particles into the spark plug hole. Then put your wrench on the nut and spin it off. Use the puller to remove the fly wheel. The points and condenser are usually in a metal box to keep them clean. You will need to know the proper point gap. You can measure the gap fully open with a feeler gauge and set the new points to the same gap. Reassemble and the saw will run.

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