Atco jap mower engine

[kurtis_bale]

Can anyone help me to identify what model of jap this is. I understand that it’s a 350cc side valve single but that’s all I know. I am looking for a carb for this engine so I need a little bit more info on the engine so I know what I’m looking for. If anyone has any parts aswell this would be a massive help.

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[hdtrust]

Hi Kurtis
Sorry for the lateness of my reply, as its our busy time at the moment pruning the apple trees through Somerset!
The engine dates from 1947 – 1953, you are correct a 350 cc. This engine unit was a side valve Atco/JAP four stroke with cooling fan cowl.
The carb should be an Amal, single lever control, fitted with air strangler.
Magneto should be a Wico series A
The starter should be by your foot, on to a lever, which should be attached to the clutch.
Hope this helps.
Photos from The Hall & Duck Trust Library

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[wristpin]

That’s answered the OP’s original question but as one of his images appears to show an Albion gearbox and clutch ; so what’s it from, not an Atco cylinder mower !

[hdtrust]

Hi Angus I see what you mean.
Well just come back from looking in all my Atco files to include non lawn mower. Although that Albion gearbox is present as its not attached in anyway, does it actually belong?
The Atco tractor’s engine was a 350 cc but that was different to this engine, as it was a two stroke.
I have checked all the Marine engine impellors they made and its not one of them either. Where the magneto is it is the correct position for a lawn mower engine, so all I can say is back to you.
Regards
Andrew

[andyfrost]

Let’s hope the poster tells us what plan he has , he appears to have removed the clutch spur in one of the pics. The remaining paint on the gearbox would maybe suggest AutoCulto or Trusty Earthquake , the Jap engine would certainly make an interesting and unusual conversion.

Andy.

[kurtis_bale]

Hi,
No the Albion gearbox had nothing to do with the engine. I’m building a bike out of it and was going to use that Albion but used a triumph slick shift in the end. Thankyou very much for the response and sorry for me being so late in replying. I still would like to know the model jap this is if possible.

[andyfrost]

It is a 350cc JAP , I have the same engine in an Emery rotavator , as posted earlier it should have an Amal carb(with choke incorporated in the slide) , not exactly a common engine by any means.Magneto should be Wico series A.

Andy.

[kurtis_bale]

Since them photos I have found the correct carb and mag. I have had it running and runs really really well!

[Author]

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