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Hans Kreuzen's 53 and 50-D1 project
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sunny
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April 13, 2016 - 3:35 pm
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i  used   to  work  in  the  old  Lotus  car  merchine  shop  &  also  employed   on  wot  i  call  hot/rod  engines      &  if i carnt  get the cranksharfts  strate    useing   it s cases   it  needs  to  go  to   someone  that  can  asemble    the  bantam  crank  correctly     i  will  say   becouse   the  4 speed   cranks   have  no  woodruf  keyway     thay  are  just  a  littal  ezer     than  the 3 speed bantons    any way  i  think  yours  needs  to go  for a  rebild   properly    sorry       do a  serch   on  here  to   seee

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mickreeves
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April 13, 2016 - 3:42 pm
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I have not tried the bearings in V blocks method (to much trouble to make the bocks), but I did try with one bearing held in the lathe chuck.
I think it matters not which way you do it. The result is the same. 
Clocking the flywheel rims on the shaft I am playing with, is no good. The wheels are covered in rust.

I was using this spare crank to learn the method. My bike is running. When the warm weather comes, I will lay up
the bike and have another go at the crank , that has a new conrod which I fitted. I will have another go at grinding the top gear
dogs to stop jumping out of gear.

Mick

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Hans Kreuzen
Queensland Australia
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October 9, 2016 - 4:42 am
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Hi All. Went on a 47 mile club run today with a strong head wind, very slowranting BUT, coming home, nearly 50 MPH as the leg shields on my 1950 plunger acted as sailsrofl

One year on the road now and I have now clocked up 547 miles on the speedo, It is running better all the time, I seams to have loosened up since I clocked the 500 miles mark.

Here are some pic's of the old girl.

Forum-pic1.jpgThis pic was taken at my mates place

Forum-pic2.jpgThe 50 in the front and the 48 rigid is on the lifter

Hanswave

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1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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BSAdave
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October 9, 2016 - 2:27 pm
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Good work as normal, Is that another one I can see lurking in the corner?

I could agree with you, but then we would both be wrong

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Hans Kreuzen
Queensland Australia
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October 9, 2016 - 9:34 pm
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There all the left over bits bolted to a 1953 plunger frame, maybe a GPO project or a bobberdunnoI realy have to get a faster bike for club runsdoh

1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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cocorico
Central France
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October 10, 2016 - 8:24 am
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Hans Kreuzen said
...I really have to get a faster bike for club runsdoh  

Have you 'ferguson'ed' your engine? Normally a club will run with the slowest bike, but I know what you mean. thumbs-up

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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Anderzander
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October 10, 2016 - 9:07 am
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I'd echo the above - well worth optimising the engine to make it a bit safer in modern traffic.

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Hans Kreuzen
Queensland Australia
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October 10, 2016 - 10:06 am
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cocorico said

Have you 'ferguson'ed' your engine? Normally a club will run with the slowest bike, but I know what you mean. thumbs-up  

Anderzander said
I'd echo the above - well worth optimising the engine to make it a bit safer in modern traffic.  

I agree with both of you, But if I touch that engine it would turn into a hand grenade, I am not that good at mechanical sdoh

But I do have a 150 cc engine in pieces, I would like to assemble it and use this in my 50 plunger to make it a bit faster on club runs.

Mind you, The 125 cc is great for around town and keeps up with the traffic at 60 KPH. 

Hanswave

1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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Anderzander
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October 10, 2016 - 11:54 am
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I don't know if you read it in my thread but I have an 'optimised' D3 and it's made the bike so much more practical to use..

On the subject of you 'not being good with mechanicals':

  1. I can't believe it, having seen what a fabulous job you are doing with the bikes.
  2. it doesn't matter anyway - the bantam is more clock-work than mechanical 😀.

Seriously though - you can make a great deal of difference just on the top end - and that's just a few nuts and bolts.

Stephen

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cocorico
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October 10, 2016 - 5:32 pm
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Hans Kreuzen said
... I do have a 150 cc engine in pieces, I would like to assemble it and use this in my 50 plunger to make it a bit faster on club runs.

Mind you, The 125 cc is great for around town and keeps up with the traffic at 60 KPH. 

Hanswave  

There you go, then - if it's in pieces, it should be easy enough to go through ferguson's basic blueprinting (eg, radiusing the ports, blending the inlet and outlet ports to the castings, flattening the cylinder head to cylinder surfaces to get rid of the gasket, etc), have a read through his topic, you don't need to go as far as the machining of a squish band.

As far as speed goes, my D3 (not blueprinted yet) will do 80kph, but is much more comfortable at 60 - 70. I wouldn't like to try a prolonged run at 80, mainly as I don't think the brakes are up to it!

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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Anderzander
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October 10, 2016 - 6:05 pm
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Wow!  Your D3 does 80kmh !!   Mine must be broken - only it isn't ..... Can't understand what's going on there.

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cocorico
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October 10, 2016 - 7:54 pm
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Anderzander said
Wow!  Your D3 does 80kmh !!   Mine must be broken - only it isn't ..... Can't understand what's going on there.  

That's 80kph (or rather 50mph) according to the Smiths Chronometric speedo, though I know it's accurate at 50kph (30mph).

It's on +20thou and an Amal carb, 4% oil (+2% Paraffin) in supermarket 95 unleaded, faint blue haze, plug colour seems right. I am in a particularly quiet area with mostly flat roads, so I get plenty of time to wind her up and not much 'interference' from other traffic. As I said though - more comfortable at 40 to 45mph.

Sorry to hijack, Hans.

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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BonesCDI
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October 10, 2016 - 8:54 pm
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cocorico said

That's 80kph (or rather 50mph) according to the Smiths Chronometric speedo, though I know it's accurate at 50kph (30mph).

It's on +20thou and an Amal carb, 4% oil (+2% Paraffin) in supermarket 95 unleaded, faint blue haze, plug colour seems right. I am in a particularly quiet area with mostly flat roads, so I get plenty of time to wind her up and not much 'interference' from other traffic. As I said though - more comfortable at 40 to 45mph.

Sorry to hijack, Hans.  

Yep my D3 is the same. I have done most of the "tweaks" Ferguson spoke of a number of years ago and I have had 60mph out of mine. I don't recommend that sort of speed on a plunger!

 look on youtube for "bantam downunder" for a clip I did at a 2 stroke rally a couple of years ago to get an idea.

Like Cocorico I generally cruise around a 45+mph all day. Capable of a lot more, but choose not to. The bike has done 3000miles since restoration.

Bones

Running and project bikes from 1912 -2005..........She hasn't said stop yet.........

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Anderzander
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October 10, 2016 - 9:17 pm
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Here we go folks - ** Please log in to view **

So we don't clutter Han's thread.

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Hans Kreuzen
Queensland Australia
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October 10, 2016 - 10:01 pm
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Anderzander said
Here we go folks - ** Please log in to view **

So we don't clutter Han's thread.  

No problem at all, about clutter or hijack, I should and will have a go at bombing up my 150 cc after the 48 rigid is finished, Great advise and inspiration from all of you.

Bones, 3000 miles clocked up, WOWclap

Cocorico, 80 Kph, great, Lots of long straight country roads around here.

Thanks, Hans

1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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Hans Kreuzen
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February 10, 2017 - 10:03 am
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Hi All

I am finally going to replace the toolbox on my 1950 plunger with a twin screw one with the correct clear back transfers, and keep the single screw one on my 53 plunger.

It's something I have been meaning to change, I will also fit the correct headlight sometime in the future.

Seeold I'm STILL counting rivets rofl

Twin-screw-toolbox-for-the-50.jpg

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1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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Maddog Leary
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February 10, 2017 - 10:08 am
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Nice one!, when I get the dosh I will ask you for a quote for a rolling chasis! Will supply all the bits....  You just work your magic...  Think we may have to rename you the Aussie 'Bantam whisperer'! LOL.

MD cheers

Maddog - 56 Swingarm D3 Major -  Major Works in progress! Machine is fighting against me every which way!

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Hans Kreuzen
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February 11, 2017 - 4:33 am
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Thanks MD, but most times I am not whispering but swearing insteadrofl

But I did have a win today as the new toolbox fitted straight in, So it is well worth buying original parts.

twin-screw-tool-box-on.jpg

Hanswave

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1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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Hans Kreuzen
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June 18, 2017 - 1:56 am
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Did a over 200 Klm trip the other day and the old Bantam is still running great, gets up to 60 Klm easy now that she is well and truly run in.

1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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Hans Kreuzen
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October 27, 2017 - 11:59 am
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The old girl is still going strong, Our car broke down a while back and I used the Bantam to get the groceries, Lot's of people wanted to have a chat, while my ice cream and frozen goods where melting, ha ha

21687997_156458034938408_1190392611190937960_n.jpg

1950 D1 plunger for daily use, Concourse 1948 D1 rigid, Black 1953 D1 plunger nearly done and a 1949 rigid D1 survivor.

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