[andyfrost]

It’s hard to say without actually “being there” , it sounds as if you may have had two issues, the large backfire would probably suggest incorrect timing. As for no spark , thoroughly check the little insulator bush behind the points and the insulator plate itself , also check the dimple on the coil is lined up with the HT pick up ,sometimes if not lined up correctly the spring loaded pin will jump out.

Andy.

[andyfrost]

I would say it’s had a replacement engine fitted, the condenser will be built into the coil , unlike the earlier Aspera which had the phelon set-up with a seperate condenser.

Andy.

[andyfrost]

My late father bought a Yeoman brand new for use on his smallholding. I think it’s fair to say they weren’t one of Howards sucess stories, over complicated gear /transmission system , that with commercial use gave unreliability problems. I well recall him fitting the sliding dog that engages the rotors on almost a yearly basis. Eventually he parked it up and got the well used 700 back into service.

Andy.

[andyfrost]

Yes , that is the correct one , matters not if it came from a fourstroke , they are all the same.

Andy.

[andyfrost]

That isn’t the correct condenser.

Andy.

[andyfrost]

Straight 30 grade.

Andy.

[andyfrost]

Alan , were the UK imports badged as Jacobson or Simplicity , something in the distant Grey matter seems to recall that there was some kind of link between them……… on the other hand I could be miles off track.

Andy.

[andyfrost]

If you can find anyone who is breaking a Hayter Osprey , the 7hp cowling will be OK.

Andy.

[andyfrost]

Sounds like it was the American market model, there was one the well known auction site a short while ago.

Andy.

[andyfrost]

The saying goes “a picture paints a thousand words” , so a photo would help us help you. I would guess that it would be a “twin lever” carb , from their very fist models until the end of twostroke engined production , they seemed to favour and specify this style of carb. Ones for the earlier V111C engines seem more plentiful , as they were also fitted to numerous motor cycles , the ones fitted to the later 24/25c are like hens teeth.

Andy.

[andyfrost]

A small number of Mk1s were fitted with the 80cc JAP twostroke.

Andy.

[andyfrost]

Ian , I don’t think I can recall ever seeing a book on the 11C , the timing and points gap will be the same as the 24/25C.

Andy.

[andyfrost]

Deffo an 11C, nice and original , still retains the proper carb and fuel pipe.

Andy.

[andyfrost]

Welcome , if it’s an 11C it will have a cast alloy cowling , pressed steel then it’s a 25C.

Andy.

[andyfrost]

Chris , memory isn’t what it was , but I seem to recall that you simply undo the nut (left hand thread) and the sprocket pulls away by hand.

Andy.

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