OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions on Other Engines JAP Stationary engine, any help with info

Hey guys, I picked this up when I went to buy a mower and was wondering if anyone can tell me anything about it as I know nothing about them I just thought it was cool, & cheap.












Oh and by the way it is a running engine.

I did a bit of looking around and it may be a type 5 or 6, around 1946-47 possibly, it is missing the cooling coweling but is mostly all there and original as far as I can tell, will get to wash it down over the next couple of days and get some clean photos so this might help someone with info, there is other case markings on it someware also.

Nice Score!

I just picked up an old Ransome Reel Mower with a J.A.P 4/3 Motor on it...Bloody Big Motor too...

Hey there Newlifemowers, does your engine look like this one?

My Motor stands around 2 feet tall....



Wrong Fuel tank (this one comes off a Rover Rancher)

Model 0 (34cc) Two Stroke

Model 2A (98cc) Four Stroke

Model 2S (98cc) Four Stroke

Model 4F (186cc) Four Stroke

Model 4/2 (245cc) 2.4bhp @ 2400rpm, Wico Mag A576BZ Four Stroke

Model 4/3 (288cc) 3.5bhp @ 2400rpm, Wico Mag CJ936 Four Stroke

Model 5 (412cc) 4.5bhp @ 2200rpm, Wico Mag CJ936 Four Stroke

Model 6 (588cc) 5.5bhp @ 1800rpm, Wico Mag CJ936 Four Stroke

Model 55 (824cc) (V-twin) 8bhp @ 2000rpm, Wico Mag Four Stroke

JAP was later sold to Norton Villiers

Well after cleaning it up a bit I found the Type stamped in the case, you will see where Newlifemowers so you can identify what your engine is, still havent nailed a year yet, the 46-47 I thought it might have been does not seem to be right as the others from that time have got a different Magnito, so still stumped. the first number shows the type/model No, the second pic I'm not sure about and but at a guess the 8831 looks to be just a plant # as it was ex PMG.




I have tryed to upload a video of it running so will post a link when and if it has worked (never done utube before)

This is the Utube link

JAP 4/3 running

jonesy, jap engine 4/3 B/P/89665/6. the numbers indicate, 4/3 model, B I think is the cc capacity, P year manufacture,1940, 89659 is the engine number and the number 6 indicates the engine is fitted with a non standard part.regards,john

voljon, thankyou very much, wow 1940, makes my mowers look young.
Is there a chart or reference for these numbers etc,some were you know of?

Thats strange as the 4/3 on the Ransomes Mower seems MUCH larger?.. & looks to be older?

see it here...

https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=48989#Post48989

Newlife, does your engine have "London" under the JAP on the crank case? as the ones I've seen all do but mine does'nt.

Yes it does

I just looked at your link again and I would say the numbers look about the same??? also noticed yours does not run a Magnito like mine and others I've seen, is it behind the flywheel? my petrol tank bracket that is cast also serves as the inspection plate on mine but yours has just a plate, cant really see what type of tank bracket you have from the pics.

Never mind I'm going mad, I can see the Maggi now.

Wrong tank on mine...its off a Rover Rancher

..BTW..Over the next day or so I'll try to give you all the date info etc i have found if it helps?

That would be good thanks, have you had yours fired up yet?

Nope...not yet.....Going to clean it up & check over first..then find (or make) an exhaust...then restore