Blower won't start warm

[Starscream]

I have a br420 but it struggles to start when it's warm.. It starts fine at first but when it's turned off its a nightmare to restart. I've stripped it down and everything seemed fine. Pot and piston is smooth as, new carb, new piston rings, new spark plug. Inlet manifold is fine, no cracks. Once everything was stripped I noticed scoring all around the flywheel and magnets. The ignition coil was touching the flywheel so I moved it away and thought the problem was solved but yesterday problems started again. Any ideas? Does the flywheel need replacing? Cheers in advance for any input

[BILLSMOWERS]

I have a br420 but it struggles to start when it's warm.. It starts fine at first but when it's turned off its a nightmare to restart. I've stripped it down and everything seemed fine. Pot and piston is smooth as, new carb, new piston rings, new spark plug. Inlet manifold is fine, no cracks. Once everything was stripped I noticed scoring all around the flywheel and magnets. The ignition coil was touching the flywheel so I moved it away and thought the problem was solved but yesterday problems started again. Any ideas? Does the flywheel need replacing? Cheers in advance for any input

may be coil breaking down when hot when you try to restart check the spark with a proper spark tester not just the spark plug

[mikerecike]

How far did you move coil away? I use a business card for gap.Loosen coil.Drop card between coil and flywheel.Let flywheel magnets attract coil.With card still in tighten coil down then remove card.Done. Warm start does sound like a coil problem as bill says. I'd also double check fuel tank is venting properly.

[GardenKit]

Its worth checking the crank bearings. If the flywheel has touched the ignition module it may be because of bearing wear. Move the flywheel round so that the magnets are not attracting before testing for play.

[spudulike]

The usual reasons for a hot engine not to start are ....low compression, faulty coil/coil to flywheel gap or lean L screw carb setting.

 

The clout to the coil may have damaged it - had a 357 like that many moons ago!