Recent Posts

Pages: « 1 2 3 4 5 6 7 8 9 10 »
51
Semi fluid grease is definitely the go - it doesn't leak out like other oils do! When putting it into the gearbox it is advisable to warm the fluid up, it is very thick indeed and takes forever to flow otherwise

Cheers, Graeme
52
Douglas Motorcycles - General Discussion / Re: 2 3/4 Rear Stand
« Last post by Domas on 06 Aug 2022 at 14:29  »
I bought a rear stand at the club and will post pictures here.
53
Douglas Motorcycles - General Discussion / Re: What the heck is this?
« Last post by Tim OConnor on 06 Aug 2022 at 11:39  »
Thank you everyone!!
54
Douglas Motorcycles - General Discussion / Re: 2 3/4 Rear Stand
« Last post by eddie on 06 Aug 2022 at 07:58  »
Sorry Tim, but neither of your stands look to be original. Douglas front stands were made from round tube flattened at the end to accept a pivot eye cut from flat plate (and then brazed in). The central lug for attaching to the mudguard is usually slotted, then counterbored for the washer and nut.  Rear stands normally have oval tube, again with a brazed in plate lug for the pivot (this also incorporates a travel stop that contacts the underside of the lower frame tube). The stand cross brace had 2 washers to centre the stand in the mudguard clip, and relied solely on the clip to hold it in place. If you can get hold of a copy of 'The illustrated History of Douglas Motorcycles', pages 16 - 20 have some good, close up shots of early 20's bikes (including the stand details).

  I am also in agreement with 'Cardan' and 'Hutch' regarding the odd fuel pipe on your machine -  it certainly looks like a 'previous owner cobble up'.

  Regards,
               Eddie.
55
Douglas Motorcycles - General Discussion / Re: What the heck is this?
« Last post by EW-Ron on 06 Aug 2022 at 05:34  »
That actually looks like its running petrol into the inlet manifold ?

Could it be some PO's attempt at fuel enrichment for cold starting purposes ?? !!
Turn tap on - for 2 seconds- turn tap off.  Initiate starting process - run and jump ?
56
Douglas Motorcycles - General Discussion / Re: What the heck is this?
« Last post by Hutch on 06 Aug 2022 at 04:10  »
Tim,

Picture of the outlet for the pipe to the carby heat jacket / muff on your bike As per above could be blanked off but hard to see in the picture.

Cheers

Hutch
57
Hi Domas,

There's only some bearings and gears in there, so any heavy weight gear oil should be OK. Some use semi-fluid grease which would also be OK, however real grease will cavitate and leave things unlubricated. I have a little Belgian FN - they lubricate their gearbox with engine oil via a two-way tap. I recall Sunbeam did the same on some of their early machines. So anything oily will be OK - just top it up after it has dripped onto the garage floor!

Leon
58
Douglas Motorcycles - General Discussion / Re: What the heck is this?
« Last post by Hutch on 06 Aug 2022 at 03:53  »
Tim,

My answer is same as Cardan's who posted while I was writing this :-)

Certainly not standard!!.

Rear tap on tank is normally just a fuel drain tap and goes nowhere. Looks like you have an earlier AMAC carburettor (little bit hard to see in the picture) which has an exhaust heating jacket on it to help stop icing up of the carby under certain weather conditions.

The heating jacket has an pipe which is connected to the exhaust system on the inlet side and another which simply exits onto the road. These pipes are often not connected and the fitting in the manifold blanked off. You may have a later exhaust manifold without the fitting tho' as this method of carby heating was not used on all models. I will have a look at your earlier posting and see if I can spot it in your pictures.

I am not sure of the purpose of feeding the fuel line through the carby jacket like this ?? - very strange. I guess if you turn the drain tap on fuel will come out of the exit hole in the heat jacket and just goes on the ground??

I will dig up some pictures if you need them. The pipes for the heat jacket are shown in the 2 3/4HP parts list 194D and 170D. If you look in the 1920 Peace program brochure on page 12, you will see a picture of a slightly later AMAC carby with a pressed heat jacket rather than the cast / soldered to the carby body earlier version but it serves the same purpose to help stop freezing of the carby.

Many owners don't bother with using the heating jacket but it probably depend on where you live and whether or not suffer from carby freezing / icing up problems.

Hope this helps,

Cheers

Hutch
59
Douglas Motorcycles - General Discussion / Re: What the heck is this?
« Last post by cardan on 06 Aug 2022 at 03:43  »
An extreme misunderstanding by a previous owner?!

I can't quite see, but Douglas commonly used a warm air muff on their AMAC carburettors, in which case you might find that the connection at the carb end doesn't go into the intake manifold, but instead into a gallery around the intake tract. If so, the other end doesn't connect to a fuel tap (!!) but instead to a collector of hot air off the exhaust pipe.

Leon
60
Douglas Motorcycles - General Discussion / What the heck is this?
« Last post by Tim OConnor on 06 Aug 2022 at 02:53  »
Can anyone tell me what this line is that goes from the back of the petrol tank to the front of the carb intake??
Pages: « 1 2 3 4 5 6 7 8 9 10 »
motorcycle