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1955 BSA Bantam D3 restoration #494942
06/21/13 6:33 pm
06/21/13 6:33 pm
Joined: Jun 2013
Posts: 31
London - England
K
Kelvin_J Offline OP
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Kelvin_J  Offline OP
BritBike Forum member
K

Joined: Jun 2013
Posts: 31
London - England
I have introduced myself on the General forum, but the basic story is that I have been into cars for many years and also competed in various cars in Speed events, but up till now (I am 53 yrs old) I have never owned or ridden a bike.

So about a year ago, I decided to start with a small restoration project and then learn to ride, as my ambition is to get a Triumph T100 or maybe a T120, which needs some work, and then I will take a test to ride the bigger bike, probably next spring.

So here are a few pictures to show what I have done so far. The original colour of the bike was grey, but the D3 also came in black, which I think looks very good, so I decided to get new chromed (actually they are polished steel) wheels, and go with the black scheme.

[Linked Image]

Here are some of the parts ready to go for powder-coat and paint.
[Linked Image]

I didn't run the motor when I first got the bike. I have never done a bike engine before and I didn't want to do a full rebuild unless it was necessary. This is the engine before anything was done to it. All I did was a rebore, new pistons, rings etc. and new clutch plates + springs. I took the AMAL carb to pieces and cleaned it well, and the engine seems to run OK, although it has not yet been tried properly on the road.

[Linked Image]

The wiring was a bit of a mess, and the bike had an MOT certificate that only allowed for daylight riding (front lights were not working) I am wiring it so that the rear brake light works, and I have replaced the headlight unit, but I have not yet wired that up. I did consider changing it to 12v but I am not sure about that yet.
[Linked Image]

[Linked Image]

[Linked Image]

Here you can see the bike is almost done. I have to put the number plates on, and the battery, but it is almost ready to ride on the road (after I take the 1-day course next month) My speedo was in bad shape, and it has no internals !! They are difficult to find and expensive, so for the time being I will refurbish the one I have while I look for a functioning one.
[Linked Image]



1955 BSA Bantam D3
1970 Triumph Bonneville T120R
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Re: 1955 BSA Bantam D3 restoration [Re: Kelvin_J] #494944
06/21/13 6:55 pm
06/21/13 6:55 pm
Joined: Nov 2012
Posts: 64
Arroyo Grande, California, USA
AG Bill Offline
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AG Bill  Offline
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Joined: Nov 2012
Posts: 64
Arroyo Grande, California, USA
Very nicely done! I agree that it looks great in black rather than grey...

Bill K


63 BSA Goldstar Catalina Scrambler
70 BSA Victor Special
67 Lotus Elan Coupe
30 Ford Model A Sport Coupe
67 Turbo Offenhauser Indy Car Display Engine
Re: 1955 BSA Bantam D3 restoration [Re: AG Bill] #494946
06/21/13 7:31 pm
06/21/13 7:31 pm
Joined: Feb 2003
Posts: 2,951
Ohio
R
Rickman Offline
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Rickman  Offline
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R

Joined: Feb 2003
Posts: 2,951
Ohio
Nice bike!
I believe they also came in a pea soup green??? With white sides on the fuel tank???

The only thing I MIGHT mention, being these were 2-smoke, be aware there are crank seals.

How long since they were replaced?
How good the originals were?
On the dry side, if there is one on these engines [ magneto/generator? ], has the seal dried up yet? [ heat cycles, and length of time used in working condition... ]

I am NOT saying the seals are gone, but if you are only aware of 4-stroke engines { and your post says nothing about 2-smoke awareness ], I'm trying to say the seals can throw you for loops, if the engine stops working, and you have air/fuel/spark, yet the engine won't run, and the timing 'mark' is set dead on...

Enjoy the bike! You should have many people looking, as I never see any of these running around here.
Brett

Re: 1955 BSA Bantam D3 restoration [Re: Kelvin_J] #494994
06/22/13 8:38 am
06/22/13 8:38 am
Joined: Jun 2013
Posts: 31
London - England
K
Kelvin_J Offline OP
BritBike Forum member
Kelvin_J  Offline OP
BritBike Forum member
K

Joined: Jun 2013
Posts: 31
London - England
Brett - thanks for your reply and your input. Yes, the D1 Bantam came in the colour they called "Mist Green". I don't know how long since the seals were last replaced, and having never worked on a 2-stroke motor before, the idea of splitting the crankcase sounded like a major job, so I thought I would do just the rebore, piston, rings and clutch and see if it ran OK. At the moment, it is starting and revving cleanly. If I find that it fails, then I will remove it and strip it right down - I will have to start to learn sometime !



1955 BSA Bantam D3
1970 Triumph Bonneville T120R
Re: 1955 BSA Bantam D3 restoration [Re: Kelvin_J] #495865
06/29/13 1:53 pm
06/29/13 1:53 pm
Joined: Jan 2012
Posts: 455
Western NY
P
Pete Suchawreck Offline
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Pete Suchawreck  Offline
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P

Joined: Jan 2012
Posts: 455
Western NY
Symptoms of leaking seals-
Magneto side can leak air so the bike will run lean. Too lean and it will seize.
Clutch side can leak oil. Smoky, fouls plugs with the correct oil/fuel mixture.

Re: 1955 BSA Bantam D3 restoration [Re: Pete Suchawreck] #495873
06/29/13 3:28 pm
06/29/13 3:28 pm
Joined: Feb 2003
Posts: 2,951
Ohio
R
Rickman Offline
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Rickman  Offline
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R

Joined: Feb 2003
Posts: 2,951
Ohio
Pete,
Don't forget that if the 'magneto' side seal starts to leak, sometimes the evidence can be an oily residue, or a damp or wet looking spread away from the seal, from the oil in the pre-mix.
I have seen that, many years ago...

Kelvin,
Dismantling a 2-smoker is so much easier than a 4-stroke, as there are no cam components to worry about; no cams to time, no cam chains to fish about, if the cams[s] are over head, no push rods, lifters, rockers to align the rods to, no lash needed to be checked, cam to rocker, or rocker to valve stem.

You just need to be sure all the items outside of the center cases are properly unfastened, so that when you crack the cases open, nothing tries to come out of the center case cavity, that you didn't want to come away.
Everything should stay within one case half.
Then, with care, you can remove the crank, then proceed with the seals, however they are inserted into each case half.

Once I got away from my childhood home, making enough of my own funds, almost every new-to-me 2-smoker got taken apart, inspected, and at least got new seals, if I had no idea about the engine's maintenance history.
Brett

Re: 1955 BSA Bantam D3 restoration [Re: Kelvin_J] #500082
08/01/13 4:51 pm
08/01/13 4:51 pm
Joined: Jun 2013
Posts: 8
staffs uk
S
snooper Offline
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snooper  Offline
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S

Joined: Jun 2013
Posts: 8
staffs uk
the endcap on your silencer is upside down.largest fin goes on top.

Re: 1955 BSA Bantam D3 restoration [Re: snooper] #500850
08/08/13 1:46 pm
08/08/13 1:46 pm
Joined: Jun 2013
Posts: 31
London - England
K
Kelvin_J Offline OP
BritBike Forum member
Kelvin_J  Offline OP
BritBike Forum member
K

Joined: Jun 2013
Posts: 31
London - England
Originally Posted by snooper
the endcap on your silencer is upside down.largest fin goes on top.


Someone else pointed that out to me on the Bantam forum... I changed it, but that was an old photo... thanks smile



1955 BSA Bantam D3
1970 Triumph Bonneville T120R

Moderated by  Richrd 


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