Stuart Turner R2 spark problem

Can anyone help? I've picked up a Stuart Turner R2 which was sat in a blokes shed for 20 years, it all seems in reasonable condition but I can't get a spark.
I cleaned the points and got a lovely spark there. I put on a new ht lead but can't seem to get an electric shock when I hold onto it and crank the engine.
Has anyone got any ideas why this may be, and how I go about fixing it? Cheers, Dan.

Hagman187 wrote:Can anyone help? I've picked up a Stuart Turner R2 which was sat in a blokes shed for 20 years, it all seems in reasonable condition but I can't get a spark.
I cleaned the points and got a lovely spark there. I put on a new ht lead but can't seem to get an electric shock when I hold onto it and crank the engine.
Has anyone got any ideas why this may be, and how I go about fixing it? Cheers, Dan.

What magneto is it ?

If you can find a makers name or a model would be usefull ,

matt

Holding the lead and waiting for a shock is probably not the most scientific way of checking for a spark! If you can fix the end of the HT lead with a gap of about 20thou from the cylinder head, or better still, put a known good spark plug in and earth it to the head you should be able to see if there's a spark. If you have got a spark at the points but not at the plug I would check the Ballast Resistor (if there is one). The spark at the points suggests that the coil is OK.

I tried the normal method of using a spark plug before holding onto the lead. I'm going down to see what mag is on it in a while, Then I'll be able to give you more info to go on with. Cheers, Dan.

I've had a look and it's a lucas sr1 mag. Cheers, Dan.

Hagman187 wrote:I've had a look and it's a lucas sr1 mag. Cheers, Dan.

Ahh that makes it alot easier now . What sort of condition are the points in ? and are you getting a spark at the points with the points cleaned up with some emory paper ? Oh and is the mag turning the right way ?

Mag should have a arrow to say which was it should turn .

matt

I was surprised how good the spark was at the points, and then quite dissapointed when nothing happened at the plug end! I haven't checked the rotation to be honest, but I will have a look tomorrow and let you know. Thanks again, Dan.

Hagman187 wrote:I was surprised how good the spark was at the points, and then quite dissapointed when nothing happened at the plug end! I haven't checked the rotation to be honest, but I will have a look tomorrow and let you know. Thanks again, Dan.

check the pick up from the cap to the end of lead with continuity setting on multimeter .

matt

Rotation is going the right way. I didn't have the multimetre handy, but when you say the pickup do you mean the little spring which touches the coil? Cheers, Dan.

I've checked the continuity from the mag to the plug and all is well. Cheers, Dan.

Hagman187 wrote:I've checked the continuity from the mag to the plug and all is well. Cheers, Dan.

is the mag sparking at the points ...? If it is then not is well and would most likley require a coil rewind .

matt

Yes, there's a good spark at the points. how do I go about getting the coil rewound and is it expensive?

Hagman187 wrote:Yes, there's a good spark at the points. how do I go about getting the coil rewound and is it expensive?

around £90 ish

contact martyn at vintage magnetos on 01179675225 and explain what you problem is and what it is off .

matt

Lovely job, thanks for your help Matt. Cheers, Dan.

Hagman187 wrote:Lovely job, thanks for your help Matt. Cheers, Dan.

just dont call him on Sundays .... he is not interested on work talk then ... phone in a eve in the week or a Saturday

matt

I've sorted it now, just bought a replacement mag for £40. Job done! Dan.

Hagman187 wrote:I've sorted it now, just bought a replacement mag for £40. Job done! Dan.

cross fingers it works though

matt

It's off a friend who's offered to take it back if it's no good. couldn't ask much fairer than that. if it is no good then I'll have to bite the bullet and get a rewind. Dan.

Hagman187 wrote:It's off a friend who's offered to take it back if it's no good. couldn't ask much fairer than that. if it is no good then I'll have to bite the bullet and get a rewind. Dan.

and thats one of the cheapest prices around i have a mag thats a American Bosch and will cost around £200 to get it sorted .

matt

Hi there!

If its sparking at the points then check the condensor,

But as you got another mag then thats cool

Adam

Might be worth putting your mag in and getting an estimate for what it needs and the price.

Stu.

A spark at the points is a clear sign of a bad capacitor. Get a new one (not "new old stock!" and fit it. then, using the 20 Kohm range on your multimeter, measure the resistance from the point where the plug lead connects to the coil and the case of the mag. It should read between 4000 and 6000 ohms. If it is infinity, the coil will have to be rewound. I can highly a capacitor called "easycap" (google it), it makes fitting and replacement a doddle.

Jim.

A spark at the points is a clear sign of a bad capacitor. Get a new one (not "new old stock!" and fit it. then, using the 20 Kohm range on your multimeter, measure the resistance from the point where the plug lead connects to the coil and the case of the mag. It should read between 4000 and 6000 ohms. If it is infinity, the coil will have to be rewound. I can highly recommend a capacitor called "easycap" (google it), it makes fitting and replacement a doddle.

Jim.

now thats a strange one my r2 has the mag inside the flywheel.are you sure its not an r3mc or r3m.any pictures.