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Mountfield Lawnmower - a first for me
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<blockquote data-quote="pycoed" data-source="post: 7030777" data-attributes="member: 744"><p>My son dropped off his Mountfield lawnmower with a B&S Sprint engine - the one with a plastic carb on top of the tank - which wouldn't run despite the administrations of himself & a neighbour.</p><p></p><p>I remembered having bodged up the diaphragm with some elec tape a couple of years back, telling him to buy & fit a new one...</p><p>So of course when I found the red tape showing under the carb, cursing the son & heir, I just ordered a new gasket & diaphragm, so began the saga:-</p><p></p><p>1 Carb diaphragm was knackered - renewed with new gasket</p><p>2 Carb O ring seal to inlet manifold was iffy - renewed</p><p>3 Carb "bowl" was dirty - in top of tank - cleaned out</p><p>4 Dismantled carb & cleaned all jets - a masterpiece of value engineering actually</p><p>5 Checked coil - was slightly rubbing on flywheel - reposition & set clearance</p><p>6 Check plug for spark - fine</p><p>6 Still wouldn't effing start</p><p>7 Have a good think - plug was soaking wet...</p><p>8 Look for different plug - only one found that would fit was an old Kohler 8hp plug.</p><p>9 Check Kohler plug for spark - OK.</p><p>10 Fit Kohler plug</p><p>11 It starts!!!</p><p>12 Cut grass -OK but it won't shut off, so pull plug lead to shut down</p><p>13 Fix cable shut off so dead man's handle works.</p><p>14 Cut some more grass - all fine & shuts down properly.</p><p>15 Write out bill to send to son</p><p></p><p>Now, I've messed about with engines of many sizes since about 1964 & <strong>never</strong> have I found the issue to be the plug(s). Everyone always says - "Oh! Change the plugs first" but I repeat I have never had a faulty plug. Caps, leads, distributors, coils , points, CDI units, sensors? yes by the bucketload, but this is the first time in 56 years I have personally found the plug to be the issue. I even have a Danarm brushcutter bought new in 1979 with a Kawasaki 35 ish cc engine that is still on the original plug. Ditto Wheelhorse tractors from 1970's. That'll learn him for putting a Briggs & Scrap'em genuine plug in it</p></blockquote><p></p>
[QUOTE="pycoed, post: 7030777, member: 744"] My son dropped off his Mountfield lawnmower with a B&S Sprint engine - the one with a plastic carb on top of the tank - which wouldn't run despite the administrations of himself & a neighbour. I remembered having bodged up the diaphragm with some elec tape a couple of years back, telling him to buy & fit a new one... So of course when I found the red tape showing under the carb, cursing the son & heir, I just ordered a new gasket & diaphragm, so began the saga:- 1 Carb diaphragm was knackered - renewed with new gasket 2 Carb O ring seal to inlet manifold was iffy - renewed 3 Carb "bowl" was dirty - in top of tank - cleaned out 4 Dismantled carb & cleaned all jets - a masterpiece of value engineering actually 5 Checked coil - was slightly rubbing on flywheel - reposition & set clearance 6 Check plug for spark - fine 6 Still wouldn't effing start 7 Have a good think - plug was soaking wet... 8 Look for different plug - only one found that would fit was an old Kohler 8hp plug. 9 Check Kohler plug for spark - OK. 10 Fit Kohler plug 11 It starts!!! 12 Cut grass -OK but it won't shut off, so pull plug lead to shut down 13 Fix cable shut off so dead man's handle works. 14 Cut some more grass - all fine & shuts down properly. 15 Write out bill to send to son Now, I've messed about with engines of many sizes since about 1964 & [B]never[/B] have I found the issue to be the plug(s). Everyone always says - "Oh! Change the plugs first" but I repeat I have never had a faulty plug. Caps, leads, distributors, coils , points, CDI units, sensors? yes by the bucketload, but this is the first time in 56 years I have personally found the plug to be the issue. I even have a Danarm brushcutter bought new in 1979 with a Kawasaki 35 ish cc engine that is still on the original plug. Ditto Wheelhorse tractors from 1970's. That'll learn him for putting a Briggs & Scrap'em genuine plug in it [/QUOTE]
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Mountfield Lawnmower - a first for me
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