Thanks for all that good advice folks. Sounds like the carb floats are the
place to start, and I'll change the plugs. I did check the carb pistons and
they were nice and smooth.
Fuel in NZ all comes from the one refinery and is ethanol free, except for one
small supplier who I don't buy from. Has not been a problem in the past.
Also been contemplating fitting electronic ignition so might do might do that
as well. We can now buy them locally.
Cheers
Douglas
-----Original Message-----
From: John Seim [mailto:kingseim@earthlink.net]
Sent: Wednesday, 2 November 2016 12:50 a.m.
To: Douglas Ormrod <Douglas.Ormrod@Neurological.org.nz>
Subject: Re: [Mg-t] Post winter TD blues
Spark plugs are too cold.
Go to NGK B6HS. Verify that the cylinder head has 22952 cast into it, top
right, front. Should be able to be seen, next to valve cover.
You either have a stuck needle to seat, or a sunken float, or both. Remove
float bowl. Observe needle drops. Spray carb cleaner at needle and seat area.
Remove float, shake, listen for fluid in float. Do same with other float.
John Seim
Irvine, CA
USA
On Oct 31, 2016, at 6:21 PM, Douglas Ormrod wrote:
> Greetings from New Zealand
>
> Long-time no chat, but long-time no problems.
>
> My 51 TD has given very little trouble over the last 8 years, but now it is.
>
> It has had very little use over the last six months, it was winter and I must
> be getting soft. Perhaps 4 outing and 50 miles. Summer now here.
>
> Started OK at the weekend, but before I could take off it started running
> very rough - sounds like down to three or two cylinders and backfiring
> through muffler. Coaxed back into the garage on almost no power.
>
> Took out plugs (which were new six months ago) and they were covered in soft
> black soot. New plugs are NKG B7ES, old ones were NKG B5ES. Cleaned them up,
> also cleaned all distributer contacts, rotor contact, and took out cleaned
> and reset the points. Checked cables for tightness. Started easily and took
> it for a 10 mile run - apart from a little missing at first all seemed fine
> once it warmed up. Power as normal.
>
> Decided to take it work today (sun out), but same scenario, started and
> sounded OK, but after a few minutes ticking over started running very rough,
> backfiring and power gone almost gone. Plugs all black and sooty again and a
> couple of them quite wet.
>
> Only part of the ignition system that was not renewed at rebuild was the
> lucas sports coil - I did have it checked at the time.
>
> So any suggestions as to the possible source of the problem?
>
> Thanks in anticipation of your collective wisdom.
>
> Douglas
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