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Old 16-07-18, 07:11 PM   #1
Eleven
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Default Small 2 stroke JAP - Please help with identification

I've been given a small JAP 2-stroke engine attached to a water pump as a nearly-running project, the first step is to identify what model it is. Please can anyone assist?

From a small bit of Googling it might be a JAP Model O type 28, its different to the type 2 in a youtube video, but similar sort of size by the looks of it, and one of the captions mentions the type 28 as being similar.

https://www.flickr.com/photos/159638304@N08/29580306408

https://www.flickr.com/photos/159638304@N08/42735133104

https://www.flickr.com/photos/159638304@N08/42735129344

https://www.flickr.com/photos/159638304@N08/29580301808

Is anyone able to provide any pointers on what model it is please? Also if anyone has any manuals on this engine, or info such as the mixture ratio then i'd be interested to hear.

Finally, any pointers on the pump, it has 'AD' cast into it, and this stamped into the top

https://www.flickr.com/photos/159638304@N08/42735125904

Thanks in advance

Last edited by Eleven; 16-07-18 at 07:15 PM.
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Old 16-07-18, 07:13 PM   #2
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Pictures might help..l
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Old 16-07-18, 07:16 PM   #3
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Quote:
Originally Posted by Chippie View Post
Pictures might help..l
Insert image fail! Now linked to a 3rd party image hosting site :-)
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Old 16-07-18, 07:40 PM   #4
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Yes, A JAP Model O engined pump.
We have one, exactly the same, OK not quite the same as ours is yellow, with a black tubular frame.
I think AD might be Auto Diesels of Uxbridge, Middlesex.
They probably sold the assembled engine and pump unit under their name.
But are unlikely to have actually manufactured the pump (although they may have had the pump made for them with AD cast in).

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Old 16-07-18, 07:56 PM   #5
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Ah excellent, glad I was on the right track! What mixture should I use for the fuel tank please anyone? I need to sort out a new cork seal for the brass tap too, though that is probably DIY-able.
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Old 17-07-18, 09:18 PM   #6
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Mixture found to be 24:1 on 2t mix or 32:1 on SAE 30 (Castrol XL) via a model boat website which had a link to a PDF of the Model O manual.

This is almost certainly a very silly question, but I cannot find an exhaust anywhere on the engine - presumably it exits the opposite side to the carb? Should there be a silencer/muffler pipe?
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Old 17-07-18, 09:31 PM   #7
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I reckon that the little "box" with the fins on is the exhaust. Does it have an outlet at the bottom?
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Old 17-07-18, 09:35 PM   #8
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Quote:
Originally Posted by pulsechoes View Post
I reckon that the little "box" with the fins on is the exhaust. Does it have an outlet at the bottom?
Correct !

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Old 17-07-18, 09:35 PM   #9
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Quote:
Originally Posted by pulsechoes View Post
I reckon that the little "box" with the fins on is the exhaust. Does it have an outlet at the bottom?
I think so too

Stuart.
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Old 17-07-18, 09:35 PM   #10
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Ah HA! yes you are right, it has one big (12mm?) hole and 4 smaller (8mm?) holes in the bottom.

Thanks! One less thing to think about :-)
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