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I have a B/S 4.5 hp lawn-mower. It will start fine, using the priming bulb, but will not run for any length of time. I have installed a new diaphragm, but it still will not run.

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The carburetor is dirty. Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. These portals can become blocked. (If there is a small screen in the Carb., this can get blocked too. Make sure that it is clean as well.)

Reassemble and start. (If there is a small screen in the Carb., this can get blocked too. Make sure that it is clean as well.)

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance on:
1. Fuel line replacement or
2. Carburetor kit replacement

Just let me know.

Jim

Posted on Sep 10, 2010

  • Jim Parker
    Jim Parker Sep 14, 2010

    Did this help to solve your problem?

    Jim

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