Petter A1 any ideas ?????

Hi there everyone.
I've just bought an old Petter A1 off ebay and the ID plate makes no sense to me.
Type   A 1
BHp    5
RPM    1650
Serial  573918 R
It's the 5hp at 1650 rpm that I find unusual as I can't find that output listed anywhere.
Any help would be very welcome.
Thanks,
Keith.

Have a look here:

[url=http://www.oldengine.org/members/diesel/PetterData/petter2.htm]http://www.oldengine.org/members/diesel/PetterData/petter2.htm[/url]

Not much I'm afraid, but a start.

http://www.oldengine.org/members/diesel/PetterData/petter2.htm

Try the link in my second post, somehow the first one went tits up!

you may also find you have a oil pump instead of splash lubrication..easy way to tell look by the starting handle area if u see a small bore pipe it has a oil pump if no pipe no oil pump....usually the 5hp is sometimes stamped as petter AS..
There is a 6hp version as well

According to my 1949 Petter operators manual 5hp @ 1650 is a standard petrol AI (or WI for water cooled) Series III of 496cc. Series III has an oil pump.

Michael

Thank's ever so much to everyone for the replies.
It would seem that I have a series III A1then as it has an oil pump.
I haven't had time to play yet but I am guessing the R at the end of the serial number is reverse rotation, plus someone has painted an anti-clockwise arrow on the flywheel.
Were these common do we know ?
Thanks again
Keith.