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Douglas Motorcycles - General Discussion / Douglas S6 ring gap
« Last post by alan reid on 15 Sep 2023 at 11:00  »
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
Douglas Motorcycles - General Discussion / Dragonfly clutch extractor
« Last post by mikkings2 on 15 Sep 2023 at 09:38  »
          Does anyone have a sketch,drawing or source for the flywheel extractor dimensions and bolt thread sizes? I'd like to make it before I start pulling the bike apart, even with a new lined cable the clutch is much too heavy, oiling the rollers and cam has done little so it looks like take it apart.
Any help appreciated
Douglas Motorcycles - General Discussion / Re: 2 3/4 Crankshaft end float
« Last post by cardan on 15 Sep 2023 at 07:02  »
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.

Douglas Motorcycles - General Discussion / 2 3/4 Crankshaft end float
« Last post by wobblyrider on 14 Sep 2023 at 11:49  »
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.
Good spot on the racing number Eddie - I'd missed that.

The problem with these shonk things ("bikes" is too good a word) is that they are sometimes bought by people who honestly don't know what they are looking at, and don't manage to find out before they close the deal. In the past I've been contacted by people who have done just this, and it's sad to have to break the news...

Insurance companies usually only want a number "replacement value". Here's a comparable bike from a reputable dealer ; presumably you can pick a number more or less than that asking price and claim that to be "replacement value".

Leon, Feel sorry for him - he'll need a lot of sympathy if he slides forward onto that gear lever!

  And feel even more sorry for any idiot who parts with that amount of money for a heap of junk! At  least it's carrying an appropriate number!

Hi does anyone know who I need to contact to get my vehicle value for insurance purposes. Thanks Chris
Douglas Motorcycles - General Discussion / Re: busted clutch bearing
« Last post by Ken Rogers on 05 Sep 2023 at 11:56  »
Hi I replaced mine with an oilite washer which I bought from
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