rs 100 not stopping

[noddy 407]

morning all....i have a mountfield rs100 that refuses to cut out...even if i replace the kill wire on the coil to any earth.....i assume the coil has failed although starts an runs well...just wont stop....am i right?

[Mick]

If the wire is good and making a good earth and still wont cut out it's got to be a faulty coil.  Make sure the coil is grounded and not sitting on a load of corrosion.

Remove the coil and clean up the posts and bolts, check again maybe with a new piece of test wire touch it directly anywhere on the engine casing and see if it kills engine.

[noddy 407]

  thanks for the quick reply.....cheers

[Mick]

Actually thinking about this, I'm trying to think about the coil layout on that machine, just I had a Chinese engine with a similar issue and that had a bad earth between the actual coil and the metal body that is was pressed onto, and this was causing it not to shutdown.  I've got a picture and video of it somewhere on here.  I'll try and find it and edit this post with a link to it.

Found it.  It's for a SV 100 not a RV 100 but it might be similar https://thegardenmachineryforum.co.uk/index.php?topic=721.0

[noddy 407]

ok cheers.....will check that out...what make of engine is it anyway...?

[Mick]

what make of engine is it anyway...?

It's a Chinese made engine, to be honest they run very nicely when carb etc is good. I quite like them.

[noddy 407]

  coil fitted..all good...carb clean and now runs sweet...thanks for the help..