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I have a mountfield classic 35. It struggles to run smoothly until it is almost out of fuel. The plug gets very oily. If the mower is tipped backwards the fuel flow is restricted and the mower runs well. What can I do to fix this?

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Replace the carby diaphram between the tank and carby that will fix it (diaphram controls the fuel pump and when faulty can make engine rich or lean with revs impossible to control)

Posted on Jul 20, 2009


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Things I would check on a brand new mower no start.

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take the plug lead off and hold it near to some metal part on the mower, move the throttle lever to around midway and pull the mower cord, if there is a spark the electrical part of the mower is working.
remove the plug, put the lead back on the plug and earth the plug on a metal area and pull the cord again, if there is spark across the points on the plug then the plug is ok, if not replace the plug and try again.
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Here is the manual.... :

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Thanks for using FixYa.


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