[vhgmcbuddy]

Carb side view

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The video doesn’t seem to open for some reason

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Picture attached

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[vhgmcbuddy]

Amal 397

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[vhgmcbuddy]

Morning Charlie it’s a Amal 397 carb

[vhgmcbuddy]

Thanks for letting me know who are or were M&G?.

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Thank you for your helpjj

[vhgmcbuddy]

Weird on the tax disc it says trusty tractor?

[vhgmcbuddy]

Hi I have found the old tax disc for my tractor can we get chassis number from this?
GFO 258 n/j on disc

[vhgmcbuddy]

Carby is in soaking now, lve managed to get it all apart except for the tiny brass screw in the base next to the main jet standoff. All is very tight so hope no leakages. The needle was stuck in the seat, l got it out and hope it cleans up and seals. I looked around for kits but no success.
The carby housing has number SC16 838E.5/50 stamped on it

[vhgmcbuddy]

16 thou is correct but it was always important to make sure that the the points faces were flat and square to each other for a setting that would “last the season”. I remember having to go out to Mastiffs that had lost their spark mid season .
Bad news that the carb is in a mess. Hope that it’s not too worn and drawing air around the spindle.
A problem with old Mag engined Mastiffs was to get them to idle ( tick over) low enough to disengage the centrifugal clutch to allow clean engagement of the gears. The original Mastiffs had a slow revving JAP engine and a MAG in good condition was just about slow enough but needed to be “ about spot on” to disengage the clutch and then not bog down when the throttle was called on to move off. A Kohler conversion sold by the then UK Kohler distributor was never happy – just would not idle slow enough. So let’s hope that you can sort the carb; may be worth giving the lump a valve job while you’re about it.
I can’t vouch for it, but something tells me that Ransomes offered a set of stronger springs for the clutch – but it was a while ago !
Let us know how you get on!

[vhgmcbuddy]

Update, l have spark

There was no continuity between points so gave them a good talking to and fixed that, set the points gap to 0.016” and now l have spark. Next is to clean the carby (it’s a mess)

[vhgmcbuddy]

Charlie

Comme c’est écrit sur le site, nous ne savons pas grand chose sur ce motoculteur, nous n’en avons jamais vu et nous cherchons éventuellement des photos
Ce serait intéressant de savoir si c’est la dénomination commerciale du C81 chez vous!

Cordialement

Marc

Mon C 81

• This reply was modified 2 years, 9 months ago by .
• This reply was modified 2 years, 9 months ago by .

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[vhgmcbuddy]

Gidday mate, thanks for your input

Reg’d No DW 02348

Makes sense its a charge coil, l thought it must have been a trigger coil. With this new info, l will check points work correctly. I do suspect the spark coil has failed though.

Photo of coil plate for review

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[vhgmcbuddy]

You don’t identify the engine – SRL xxx ? However back in the day many of the MAGs fitted to Mastiffs etc were equipped for electric start or lighting even though that wasn’t fitted. So, as you say coils – in the plural, you probably have a surplus charging coil.
Identify the ignition coil with the HT plug lead and probably a single primary coil wire going to the points where it will probably share a common terminal with the condenser / capacitor and maybe a kill wire going to an on/off switch on the handle bar. Memory says that the internal wires are often taken to a terminal block on the outside of the engine cowling.
If it will help, I can possibly find a wiring diagram but it will assist if you can supply the SRL number.

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