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paul
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Quote paul Replybullet Topic: merry tiller, no spark
    Posted: 26 Mar 2013 at 8:15pm
Hi the merry tiller in question is the one that has just been brought back to life after living in a barn. It was running last weekend  but went to try it tonight and there is no spark, not even a shock of the ht lead, i have checked the gap in the points which is ok, i presume it is the coil causing the problem but dont know. If anyone could advise me i would really appreciate it also does anyone know the briggs part number for the coil. Thanks Paul
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mowersman
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Quote mowersman Replybullet Posted: 26 Mar 2013 at 8:19pm
Couple of things...
What size engine is it? 3,4 or 5HP?
Also, do you have a multimeter.
Andrew
The more I work with petrols, the more I like diesels...
Yeovil, Somerset
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paul
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Quote paul Replybullet Posted: 26 Mar 2013 at 8:21pm
Its a 5hp engine. i dont have a meter but can get hold of one
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mowersman
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Quote mowersman Replybullet Posted: 26 Mar 2013 at 8:24pm
Test the resistance between the HT lead and ground, it should be in the range of 4k ohms.
Andre
The more I work with petrols, the more I like diesels...
Yeovil, Somerset
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wristpin
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Quote wristpin Replybullet Posted: 26 Mar 2013 at 8:42pm
If your set-up is one where the engine is stopped by fully closing the throttle make sure that the little cut-out switch on the throttle plate is not grounding the coil primary when it shouldn't.
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Dieselhead
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Quote Dieselhead Replybullet Posted: 26 Mar 2013 at 9:06pm
Agree, I would disconnect the wire to the carb then spin it over & see I you have a spark
Chris. I aint getting on no plane. Fool!
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merryman
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Quote merryman Replybullet Posted: 27 Mar 2013 at 8:35am
A few things can occur with an engine after a long lay up. The points can stick open if the plunger has corroded to the block, unlikely as the engine did run for a while. The surfaces of the points can oxidise and the engine will run until the sparking and oxidation form an insulating layer.

I have never known a B & S coil to give up suddenly, normal procedure is to get worse to start and then cut out when hot.

Another ignition kill switch was fitted to later, replacement B & S engines, this was operated by a float in the sump to prevent you running low on oil, if you change the oil after a lay up the float can stick to the gunge at the bottom. I sent a Merry Tiller to St Helena, dry of oil, and the buyer couldn’t get a spark because the float was stuck down when he filled it.
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paul
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Quote paul Replybullet Posted: 27 Mar 2013 at 8:04pm
Thankyou all, I tried disconnecting the wire you said which is under the fuel tank on a little clip then turned her over, hey presto a spark, then put the wire back in and its still sparking. I will give it a run up over the easter weekend. i have got hold of a meter so will check everything out while i have it on loan. Thanks again its amazing what a bit of knowledge achieves. thats why these clubs are great
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paul
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Quote paul Replybullet Posted: 29 Mar 2013 at 6:26pm
Hi, i put a multimeter on  today and its reading 4.5k ohms so all ok thanks. paul
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paul
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Quote paul Replybullet Posted: 31 Mar 2013 at 7:38pm
Hi, A friend spoke to me today, he has a landmaster 130 which was running last week but now no spark, could this be the same problem i had with the switch? The engine is a 3hp briggs and stratton. thanks. paul
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wristpin
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Quote wristpin Replybullet Posted: 31 Mar 2013 at 7:54pm
Could well be but also could be any of the other things that people have suggested ! A systematic approach to trouble shooting is quickest in the long run. Many years ago a Hayter Hawk with a BS breaker plunger that stuck out with the points held open after about 10 min running but then freed off by the time one had got the flywheel off gave me the run around for about a week!!
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paul
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Quote paul Replybullet Posted: 31 Mar 2013 at 8:05pm
Thanks wristpin, he is going to bring it up tomorrow so i can have a look.
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