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Hobbo D3 Trail Build
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Stoo63
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November 18, 2019 - 11:02 pm
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Here's an old post with the sizes. I get mine from Simply bearings too. 

Jimmie said
My D7 has got a very second hand engine unit. Could someone give me the size/ref for the bearings as the existing ones are of the red type, ie rusty. Many thanks

Jimmie,

First, get a parts book for your bike. These are availble reasonably widely and are invaluable.

Her are the bearing details:

The inner crankshaft bearings are: LS8 or LJ3/4 or RLS6

The outer crankshaft bearing is: 6203 or Hoffman 117

The gearbox output bearing is: KLNJ7/8 or Hoffman S9 or EE8 or SMT R14

The mainshaft bearing (clutch) is: LS7 or LJ5/8

They may also have other part numbers and for reference Hoffman are no longer with us.

I have always found this firm speedy with their deliveries  ** Please log in to view ** as are T&G motorcycles.  Local bearing stockests are good (because they are local) as are some other Bantam parts suppliers. 

Similarly, you can source all the seals from stockists - sizes here ** Please log in to view **

Or get a set all made up from one of the many suppliers  online

.

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

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bantammad
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December 8, 2019 - 5:12 pm
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Hi bantammad ere here is a way of working out approximately how many extra chain links you may require look too see what you need lets say 14 t and 47 t you 120 links as a ball park figure now you gonna fit 58t drive sprocket so you require 11 more links follow me have fun regards LES

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Hobbo
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December 22, 2019 - 9:50 am
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Hi

i have sorted the main bearings now, a right saga and moved on to the exhaust system. I have also bought a D7 3 speed engine, was too good an offer to refuse with reborn; new piston and all new bearings and seals. I will run this engine in the D3 frame but will still finish the D3 engine rebuild. I have also found an Amal 375 carb as well though having a few minor issues, see my post in the D7 section.

the original D3 exhaust is not really suitable so I want to buy a trails system that is lighter. Can anyone recommend where I can get a pipe and silencer from that would fit my bike. I’ve had a look on the tintetnet but can’t find a system precisely made for a bantam. I guess other models may fit but don’t want to risk it until I’m sure

happy Christmas 

best Paul

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Hobbo
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December 23, 2019 - 4:41 pm
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hi

i am struggling to find an alloy silencer and pipe for my bantam trails build. I think I will put on a D7 high 13/8 trails pipe but not sure where to get an alloy silencer that will fit this pipe.

i have just found out that I can get pipe diameter changers so the silencer does not have to fit the front pipe exactly.

can anyone recommend an alloy silencer that will allow the D7 engine to run properly. 

All help much appreciated by this novice

cheers

Paul

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Hobbo
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January 25, 2020 - 8:01 pm
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Hi, still trying to get my D3 with a D7 engine running properly but getting there.

i was originally going to keep the original D3 forks and rear shocks and may still do.

However I want to explore replacing both, I have read a set of threads replacing them with Honda or Suzuki forks but can’t really tell if that mod would fit a D3 (swing arm model). Can anyone suggest a more modern front fork replacement that allows me to still use the D3 wheel.

Can anyone also recommend a set of rear shocks, light in both weight and expense,

best

Paul

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Blue Heeler
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January 25, 2020 - 9:17 pm
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Hi Paul,

If you`re going to change the Bantam look to the extent of fitting modern forks, aren`t you tempted to have better brakes too?

To incorporate the D3 wheel into modern forks, it`s probably best just to offer it up and then measure up for spacers and spindle/bearings, brake back-plate anchor arm etc. Get someone to knock you the bits up? Mudguard mountings may be an interesting challenge.

I have a Bantam Cub that previous owner put a complete unmodified CG125 front-end onto, so only mod was to the Bantam Cub headstock, which I see has had new bearing cup holders welded top & bottom. This was necessary because the Hondas etc have longer headstocks.

Blue

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NeilB
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January 26, 2020 - 12:04 am
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Don't forget that any other bike's suspension will be designed to work properly with that specific weight, wheelbase, rake, wheels, tyre sizes, etc and could make your bike handle worse even though the parts are "better".

Just my opinion, but I've never understood the point of getting a bike and then turning it into a different bike. Why try and turn a bantam into a cg125 (for instance) when you may as well just get the Honda in the first place? 

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swalsh58
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January 26, 2020 - 8:22 am
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Is your bike already registered with a V5? If it isn’t, then changing the forks for non original will make your life more difficult. If you have a Bantam because you like them, why turn it into something different? I have seen quite a few Bantams which have been modified in many different ways - Honda engines, Honda forks, frame altered even different fuel tanks and wheels. But then is it a Bantam any longer? Why buy a Bantam in the first place if you are going to change it all and make it a mongrel? Put the later Bantam forks on if you like, but try to keep it all Bantam. However, it’s your bike and you can do as you please with it. If you want Honda forks that’s your choice and plenty have done it before.

Current bikes......1958 D5,  and a 76 Honda C90 in the workshop.

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sunny
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January 26, 2020 - 10:24 am
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D 1,3&5    WILL NOT   acsept   the  D 7  onward  forks     nor  are  the  D 3& 5  s/a    frame    harfs    interchageable    without  DRASIC   WELDING   done   so  i  dont  think  honda   forks   will   ethr   and  never   seen    them    on here  ,,  so i  think   somone  proov    me  rong

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chickensoup
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January 26, 2020 - 10:37 am
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Hi Paul,

Are you in the process of creating a D3 off road/ green laner. Is this why you are asking about modified suspension.

Nick

1950 BSA D1 Plunger   242 UYW

1966 BSA D7  LBF 62 D

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Stoo63
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January 26, 2020 - 11:40 am
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EDIT: posts moved over here as it's all related....

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

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Blue Heeler
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January 26, 2020 - 7:42 pm
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NeilB said

Just my opinion, but I've never understood the point of getting a bike and then turning it into a different bike. Why try and turn a bantam into a cg125 (for instance) when you may as well just get the Honda in the first place?   

Blue`s reply:- Yeah, I personally prefer the original look , so will be changing it back to std. It will mean I have to take the grinder to the headstock......carefully.

My cheap Cub with CG125? front-end, is jammed in between my D7 and D10 in storage, but happy to take photos for anyone who is  considering a similar mod. Will have to be via email though. I completely understand someone building up a bike from bits and  bobs....using whatever`s available 🙂

Sunny said...

"D 1,3&5    WILL NOT   acsept   the  D 7  onward  forks     nor  are  the  D 3& 5  s/a    frame    harfs    interchageable    without  DRASIC   WELDING   done   so  i  dont  think  honda   forks   will   ethr   and  never   seen    them    on here  ,,  so i  think   somone  proov    me  rong"

Blue`s reply:- Sunny, would you like a photo of my D5 with heavyweight forks 🙂 ......plus my Bantam Cub with Honda front-end 😉 Previous owner extended headstock top & bottom, as mentioned above.

Paul,

Go for it mate, we`re right behind you...almost anything is possible.

Cheers,

Blue

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sunny
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January 28, 2020 - 1:39 pm
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i an  sorry  my  lac  of  the   writen   word   limits me  some wot      be  useles   at  english      so   have  to  say  thay  will   but  with   probams  the  tern  stops  are  a case  in piont    its  not  werth  the  hasle      and  if  i  inspeced  such  a  choped  bantam   it  woud  not get  a  riten  confermtion   from  me    as  i   said   sorry   to  have  to  mack  a  point  ,,  being   an  ex   Helth  &  Safte   Rep for  the  ISTC your  heth  &  well  being  is upermost  in my   mind

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Blue Heeler
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January 28, 2020 - 2:19 pm
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Read you just fine Sunny.....and value your deep knowledge on Bantams etc  🙂

Yes, be careful folks, your life may depend on it.

Modified work by the skilled is just fine.

Blue(qualified welder, fabricator, mechanic and MOT tester) 😉

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bantammad
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January 28, 2020 - 2:44 pm
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Bantammad ere just my thoughts to Blue or should l say snap. Safe riding regards Les

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