classic motorcycle forum

No Crockers here but some have crocks-of-shite.

lousy photo but frame could be BSA plunger; oil tank has shades of AMC; forks could be BSA,even Matchless.

If your magneto is dizzy do the bolts up.

Im trying to identify parts of this bike for an artical Im scratching together .
chassis = 49 - 52- Indian scout , motor = crocker ,  trans = HD predate electra-glide.
fuel tank = looks brit ??
oil tank = brit ??

HD clutch = 37 tooth 2 row that requires 428-2 chain , that requires 2 row motor sprocket for 1" taper motor shaft = pre 1954 HD sprocket  , tin primary case .
trans out put = HD therefore 530 rear chain

usually motor has magneto out front BUT notice there is a tail and head light ?  there fore , there is power or a total loss battery strapped on but not visable thru rear wheel ?? . magneto could be replaced by gen . there was a dizzy also available for there motors , which would need a gen which was driven off stock clutch basket which this is not . it was an autolite clock wise rot.
HD usually had gen off front of motor driven by the timing gears .
motor has 2 separate oil pumps which are the copper pipes up the guts centre .

HD primary has no allowance for dynamo take off drive or pulley
under the tank theres a wire parallel to down tube

front brake lever by his elbow . no shadow of RH lever on tank = no clutch lever therefore LH foot clutch and LH hand change .
bike is resting on the kicker . right above kick spring is where clutch arm is which needs room to move forwards and backwards .
between the blue line , the rear exhaust and above the clutch arm there is a mass fairly well lit but  ....possibly brit dynamo ?    ......more I look its most likely the shifter drum housing / lid
 
Rear hub =  LH sprocket drum ??  brit equivalents ?
49 scout rear axle is straight dia 1/2-20 , any brit equivalents ?

any ideas or theory , feel free to throw it in the mix , there cant be any wrong answers

1925 to 27 the taper bearing is timken 19138 , 19283 , outer race is 14mm . this available and no one uses them . there are replacement BB which have the outer trimmed to suit.
there are 2 helical baskets , diff being the neck area where the bearing sits . shoulder if you want to call it anything I guess . .850" or .950" deep

I have original NOS bearing as a reference pre 1925 , its thrust but it can be replaced with one of the modern trimmed ones in stead. over all width is 14mm (inline) but when reversed on it self over all width is 17mm = outer race facing one way and the inner facing other under thrust against each other . leaving the BB staggered ....17mm wide

the early BB or the taper need thrust washers.
the 101 replaced the bearing with 35 x 72 x 17 , right up to 1953
later bikes chief , 741 use radial bearing , HD use same BB

RH BB is velocette and landrover bearing

I think you're right Per. It's mostly a bike built up of proprietary items. Most are a reasonable price. An Albion gearbox for example, won't break the bank. British Hub wheels are fairly easy to find.  The killer is the JAP engine. Even the cooking 250 ohv as used here is in high demand.  Nevertheless it is eminently do able and the joy of a Montgomery is that no one quite knows what is correct or not. From looking at the Montgomery in my shed its fairly obvious they were a small firm who used whatever was available. Some parts are very good, some are quite agricultural.

As far as the frame number is concerned the VMCC Register lists three Montgomery similar to yours. A 1936 model. frame number 92**. A 1937 with frame number 93** and 1939 with 95**. My entirely different 123cc Villiers powered 1939 model has a frame number starting 10***. I suspect Montgomery was so tiny they used the one set of numbers for all machines regardless of what model it was. Whatever they built that day got stamped with the next available number. The VMCC Marque specialist should be able to accurately date it for you.

Tanks aren't that expensive to have made. It's not the drama you may think. It's not as if it's a Brough or Vincent where every man and his dog will look at it and have an opinion. As long as it looks broadly like the catalogue picture, fits neatly and the handlebars don't hit it no one will know if it's slightly out here or there. If it looks right it is right.

Copies of catalogues are available from both BMS and the VMCC Library. Tank transfers are available.

It would be an attractive and smart little bike

Cheers,           

Hi Leon,
Well done 

John