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I have an 18hp briggs and stratton v twin that starts up great and after about 30 minutes of running it will shut down and not start until it is completely cold. I herd that briggs v twin engines have had a reputation for the coils overheating and failing. Is this true and are there any aftermarket options or solutions to remedy this? Any help would be greatly appreciated.

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Hi yes magnetron coils can do this

but 1st check that you dont have tight valve clearances
they should be 0.003 thou inlet and 0.005 thou exhaust

if your machine it getting hot and shutting down and you have too wait for it to cool coils maybe going o/circuit

the way to test is to run engine untill this happens and fit in line spark tester between ht lead and plug then try retarting if no spark in the tester window- possible diodes in harness could be faulty

remove blower cover and pull wires that go to each magnetron coil this isolates diodes from coils and retest if still no spark when hot then magnetron coils faulty when hot

your local shop should be able to source magnetron coils either second hand - tested or aftermarket be sure to give them b/s model and type numbers and date code off engine to get correct part

here is web site for parts breakdown-:
http://www.briggsandstratton.com/maint_repair/manual_and_more/

just enter model and type numbers and download a manual / parts list

cheers paul

hope it helps

Posted on Aug 08, 2010

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