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1950 D1 Rigid Exhaust
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GlenAnderson
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March 30, 2021 - 9:35 pm
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lbayorkie said
Yet the exhaust suppliers and Bantam specialists say rigids only ever had under the footrest exhausts. No wonder most rigid owners have 'under' exhausts if that's whats being recommended.   

Plenty of “experts” are just confident in their ignorance. 

Lots and lots of period photos confirming that rigid bikes had their exhaust rerouted at around the same time as the plunger ones were introduced. Maybe the root of the rumour is that all plunger machines have the exhaust over the footrest. 

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lbayorkie
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March 30, 2021 - 9:45 pm
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Not sure what you mean. Im trying to get the 'over' exhaust that came with the bike to fit properly. I've tried to source a new over pipe but none of the retailers acknowledge that rigids ever had them. Nearest they can offer is a D1 plunger exhaust, which, like the one I have has kick out at the very end.

That bike in the image by the way is mine. Taken by the previous owner who told me it had been fully restored. What you can't see is the pipe is so far over he had to cut an inch off the footrest rubber!

Im going to have one more try with a friend of mine to get it to fit.

Thanks

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GlenAnderson
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March 31, 2021 - 7:10 am
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GlenAnderson
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March 31, 2021 - 7:12 am
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The previous owner of yours, as has been clearly demonstrated, was a charlatan or a dangerous incompetent; quite possibly both. 

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sunny
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March 31, 2021 - 8:48 am
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i   dont  usly   coment   on  uthers    but   its  a  good  thing   to  ask  clubmates  to  go  with  you  wen  looking  the  perchas   something   .,

   i  think  a project   is    to  keep  us   thinking , playing  and  having  some  practical   fun  along  the way   this  one  has not  been  very  good for you 

Alan   but   chin  up    the  clever  giys   are   doing  a  grate  job  , to  go  with  Glens   post   44    i  think  its  something  moor  than  

POSSIBLY   BOTH    

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lbayorkie
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March 31, 2021 - 8:54 am
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Glen, in an earlier post you said you got your rigid 'over the footrest' exhaust from Armours and it fitted. Could you tell me which one it was please?  Thanks.

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GlenAnderson
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March 31, 2021 - 9:14 am
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The one they market as a “plunger” version. 

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GlenAnderson
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March 31, 2021 - 9:23 am
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I just can’t understand how you are getting so stuck on this. 

Either make your existing one fit, or buy another. If you want one that goes under the footrest, get one. The two single fixed points are the exhaust port on the engine and the tab on the frame. The only obstacle the pipe has to clear is the footrest. These points are all in exactly the same relative positions regardless of whether the bike is an early one, a late one, a plunger or a rigid. Either type of exhaust will fit on a rigid. Only the over footrest type with the inset in the silencer will fit a plunger. 

I will dig out the factory original header pipe this afternoon and take some pictures for you. 

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GlenAnderson
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March 31, 2021 - 11:47 am
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For what it’s worth, this is my understanding of the timeline:

1948, the Bantam is introduced, rigid frame only, and exhaust routed under the footrest, with the silencer tipped upwards at a jaunty angle at the rear, with its bottom edge following the line of the bottom frame stay in a neat styling touch. 

The lack of rear suspension was swiftly highlighted as a shortcoming for some so, for the 1950 model year (which started in September 1949), a plunger frame was an option. 

This meant a revision to the rear frame stays to allow the mounting of the plunger units and a heavier rear wheel setup.

The existing silencer and exhaust pipe setup fouled the bulkier new rear end, so it was re-routed over the footrest (with a scalloped spacer bar) to raise the inlet of the silencer and drop the rear slightly. A dent was also pressed into the rear of the silencer to give the remaining room needed to clear the plungers. 

This new system also fitted the rigid models, because all the mounting points were in the same place. However, the factory still held extensive stocks of the earlier type of pipe and silencer, so these continued to  be fitted until that stock was depleted. This is why the first few thousand 1950 model year rigid bikes with frame number YD1 20001 onwards have the earlier setup, but by YD1 24813 they were used up and from that point onwards the factory only used the “plunger” style exhaust on both models, and they carried the same part number. 

At the end of the day, if you have a plunger machine, you have to fit an over the footrest exhaust and later silencer with the dent in the back. If you have a rigid, you can fit either system. There are probably very few bikes out there still wearing their original exhaust pipes. My original one is still sound, but was very rusted and pitted. Any bike later than YD1 24813 that is now wearing an under the footrest exhaust has almost certainly had it retro-fitted in the (many) decades since it left the factory. 

My exhaust came from Peter Ellis, when he was trading as T&G in the late 90s, but it came in a bag with an Armours label. 

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Stoo63
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March 31, 2021 - 12:33 pm
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Thank you, Glen. 

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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lbayorkie
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March 31, 2021 - 1:44 pm
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That all sounds logical and pretty much confirms my view. I assume the 'kick' at the end is as relevant to rigids as plungers. I will let you know how I get on. I put a 'wanted' up for the silencer stud. 

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