Author Topic: Mounting problems with rear fender for BSA A7, 1951  (Read 150 times)

Offline Martin

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Hi, I am step by step solving small issues on my new BSA, I did some work on clutch, harness change,... but now I am trying to fit correctly rear fender. The end part with rear light does not fit very well to the second part of the fender, therefore I am trying to rework it. But still I am not successful. Do you have some similar experience? Should be BSA A7, 1951 plunger, but I have some suspicion that some parts are from a10. And it is visible that previous owner has got the same issue and he tried several options.
Thanks for any help and advice.
Martin
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BSA A7 Plunger 1951, Jawa 250 Sport 1965, Jawa 250 1956, Jawa 350 1956, Jawa 250 1955, Jawa Special 250 1938, CZ 175/501 1959

Offline Swarfcut

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Re: Mounting problems with rear fender for BSA A7, 1951
« Reply #1 on: 23.02. 2020 14:33 »
  Martin...    I may be wrong, but picture 4 shows a couple of indents more associated with a front fender ( mudguard ), to clear the fork legs rather than to clear rear frame members, so thinking this actually started life as a front mudguard. Anyone else know if early A7 rear guard has these indents?

 The rear section was originally designed to be hinged, yours looks to be a bolt on homespun adaption. The lower edge usually flares out at the bottom. The number plate mount for the year is an open type, rather than the post  '53 boxed in type that you have there. Rear light is also a later type, more suited to the later boxed type with an indent to the pressing to make the lens lie more in line with the top of the box.

 So, first decide if you can source a better mudguard, one correct for the year. Otherwise making yours fit is not impossible, but will be a real test.  To be honest it isn't far off, bolting the guard to the stays will improve things. Aim for the guard to follow the wheel and tyre when off the stand.

  The upright arm of the  rear mudguard stays are moved slightly forward of true vertical, and bolt inside the mudguard. The rearward arms end up horizontal or more often pointing very slightly down at the rear. Behind the gearbox are two horizontal steel strip mounting stays.

  This leaves the awkward to describe arrangement adjacent to the seat spring lower mount. Here the bolt through the frame  passes through a cylindrical spacer and supports a bridge piece under the mudguard.  The bridge has rivets to mount the guard.  The spacers fit into cutouts in the side of the mudguard blade, the bolts do not  attach directly to the mudguard blade.  See how this compares with what you have.

 Lots of pictures available, and maybe some helpful Forum Members can post some as well.

 Swarfy.
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Offline Martin

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Re: Mounting problems with rear fender for BSA A7, 1951
« Reply #2 on: 23.02. 2020 15:35 »
I have found the new one exactly the same designe as mine. So I think that mine is the original one.
https://vintagesteelfenders.com/mudguards/bsa-plunger-rear-1949-53
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BSA A7 Plunger 1951, Jawa 250 Sport 1965, Jawa 250 1956, Jawa 350 1956, Jawa 250 1955, Jawa Special 250 1938, CZ 175/501 1959

Online BSA_54A10

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Re: Mounting problems with rear fender for BSA A7, 1951
« Reply #3 on: 23.02. 2020 19:09 »
There were a lot of BSA's that had a very similar rear guard.
What we need to see is the actual profile of both the guard and the tail piece edge on.
I could almost guarantee that they will not be the same shape.
The guard should have a lip pressed into it for the tailpiece to sit on.
It is not uncommon to find a one piece guard cut short and then drilled so the tailpiece can be bolted on to it or a hinged guard fitted after the hinge is cut off.

We treat them as if they are made of gold but in the day they were transport for the masses so whatever went into the space so dad to get to work or the family could go on holidays was what went into the space.
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Trevor

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Re: Mounting problems with rear fender for BSA A7, 1951
« Reply #4 on: 23.02. 2020 20:12 »
G'day Martin.
I agree with Swarfy in that the guard is not correct for a 51 A7/10, neither is the one in the link.
The one in this link is for a single but is the same except for the ears at the front (the twins don't have this). https://www.ebay.com/itm/New-Bsa-B31-B33-Plunger-Model-Handmade-Raw-Steel-Rear-Mudguard-Fender-/193194394027
Cheers.
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'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Muskys Plunger A7