Douglas S6 Piston Ring Gap.
I am putting together a 1930 S6 engine and looking through the Douglas Care & maintenance book
it states the ring gap is .004 in!
My question is, is this enough.
Alan Reid

I'm no expert on assembling 2 3/4 engines, but in general zero is not enough, and 0.020" is probably too much, so maybe aim for 10 thou or so? There is no adjustment per se, so you'll have to see how you go with/without a paper gasket between the crankcase halves, and with/without shims behind the main bearing outers as required. The key dimension is the centrality of the con rods in the cylinders. If you've had a con rod mischief, don't forget to double check that the rods are straight before everything goes back together.

Leon

I am about to reassemble my 1913 2 3/4 motor after a conrod big end bolt failure.  I'm putting new bearings in the crankcase as well as big end etc. Can someone please advise the specification and adjustment for the end float of the crankshaft?
Thanks in advance.

Insurance companies usually only want a number "replacement value". Here's a comparable bike from a reputable dealer http://www.verralls.com/vintage-motorcycles/1928-500cc-douglas-sw5.html ; presumably you can pick a number more or less than that asking price and claim that to be "replacement value".

Leon

Hi does anyone know who I need to contact to get my vehicle value for insurance purposes. Thanks Chris