SteveCarver

Thanks. I'm a member but as far as I know, no one in the club has one of these. I'll whizz off and email to the technical sec to ask for advice. Ta!

You might be right. I take OBM but never thought of writing to them for advice. Thanks.

Hi folks, I'm new to this forum but have read several posts here and it sounds like some of you might have the knowledge I'm after. I am working on restoring a 1939 Sunbeam B24/25T and have been searching high and low for information on likely ratios in the Burman box. I admit to knowing next to nothing about trials machinery but the bike is in my workshop and I've committed myself to it as the next project. The bike came to me (loosely put together) with both the 350 and the 500 engine, the latter in frame. The former has had a hard life but may yet be saved. The 500 came from Lithuania (apparently) but is in good order. I digress but the 350 or 500 engine is perhaps relevant as regards gearing. Anyway, the bike also came with two Burman CP boxes. They might be from anywhere (who knows?) but are geared as follows: #1 Main shaft: 30/23-18/27 Lay shaft: 20, 27/18-18/32,23 #2 Mainshaft: 32/23-18/29 Lay shaft: 18, 27/18-18/32,21 Are these any use? I know that the 500s were originally fitted with the heavier/stronger BAP box, so I'm currently on the look out for one. Any help or hints would be gratefully received. Best regards, Steve