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New Bantam D7 engined trials project all help and info welcome
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nicbrrghs
Lytham St Annes
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May 16, 2020 - 9:52 am
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Hi, First time Bantam owner here in sunny Lytham. Please look at pictures and give me any info you can about bike, advice etc, Could someone please confirm what forks and hubs they are.[Image Can Not Be Found]4.jpg

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Sponge
Lancashire (A chip shop somewhere near Preston)
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May 16, 2020 - 11:37 am
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Hi Nic ??

Its difficult to see as I can only open one photograph but it looks like you may have Bantam heavyweight D14 sports/bushman forks with a strange front spindle made up.  These are excellent forks for trials so long as you get the right springs in them. The brakeplate looks to be bantam or Tiger Cub but is not consistent with the forks.    They could also be C15 or B40 but I cannot identify from the images you have posted. 

If I could get a close up of the front wheel, brake, hub, fork ends area I might be able to offer more help. 

Sponge ( South Lancs area) 

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Blue Heeler
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May 16, 2020 - 3:51 pm
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Hello Nic,

Further to viewing more pics & details, so guessing... 1958 D5 frame/sub-frame/swing-arm/engine.

D7/10/14/B175 petrol tank

Can you provide the first letters/number off top of engine nearside? Also from headstock(if memory serves) for frame number.

What size wheels are you running?

Plenty of grafted on bits`n`bobs which is usual for a dirt bike.

Blue

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nicbrrghs
Lytham St Annes
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May 16, 2020 - 5:39 pm
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Thanks for advice, spindle looks very odd but at moment allows bike to roll. I cant seem to upload any pics right now for some reason. The stem seems about 25mm too long at present I heard its as simple as cutting it down and using same headraces. Any ideas?1compressed.jpg2-compressed.jpg3-compressed.jpg

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Blue Heeler
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May 16, 2020 - 5:44 pm
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Ah, D3(1957), not D5. Very similar frames. Any pics of engine number?

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nicbrrghs
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May 16, 2020 - 5:55 pm
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Blue Heeler: Standard Trials sized wheels 21" front 18 Rear.

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Blue Heeler
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May 16, 2020 - 6:03 pm
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Whoops, clue to engine is in your title(D7), silly me.

Nice amount of ground clearance, maybe fit a bash plate? If it has standard steering geometry, she may be a bit unstable on the road, with a 21" front? Quite a bit bigger than the original, so something to be mindful of when you take her for a blast.

Have a loose set of h/w forks within easy reach, fairly sure they`re B175 or Bantam Sport, so can measure stem if you need to compare?

Blue

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bantammad
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May 16, 2020 - 9:07 pm
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Hi bantammad ere just the job my kind a trials type build carnt add much bin covered by Blue and Sponge how ever just in the process of building a new trials type my self but yours looks good from the shed Les 

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SpacedMarine
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May 17, 2020 - 12:09 am
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Looks like a hoot!Or with it being a bantam should it be a cluck?👍🏼

What's 7/16 in mm again?

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Blue Heeler
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May 18, 2020 - 4:52 pm
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nicbrrghs said
The stem seems about 25mm too long at present I heard its as simple as cutting it down and using same headraces. Any ideas?  

Yeah, maybe showing it a 1mm slitting disc is the answer, providing nothing else is missing. Can`t you fit a spacer, that`s one solution I`ve seen employed.

Just measured the stem on my loose h/w forks...158mm(slightly shy of 6 1/4"), from top face of bottom yoke to top of stem threads. My forks are these type.. ** Please log in to view **

A Bantam Cub of mine has a Japanese front-end, they have longer head-stocks than Bantam frames, so new inset/insert housings for headraces were welded into existing steering head voids top & bottom to accept a longer yoke stem, by a previous owner. It is a job that is doable with basic w/shop equipment+materials & bit of skill & patience.

Without actually checking,I`m not sure if a D3 headstock is much shorter than the later Bantams...but if so, may explain the situation you find with your extra 25mm/inch? Or maybe you have some yokes/forks off a bigger BSA-Triumph 4-stroke frame, of more value than Bantam replacements?

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mcafee
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May 22, 2020 - 7:38 am
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Morning I think Blue Heeler may be right the forks look very similar to those on a Tiger 90 I rebuilt some time ago unfortunately I dont have it any more.If you can find a set of heavy weight forks you will find they work very well off road with a softer spring and a sae 10 fork oil.I have done several long distance trials on my B175 and the bike performs very well with this set up (better than me!!)

David

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nicbrrghs
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June 19, 2020 - 1:52 pm
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Hi i have a red wire going to an external coil. How do I splice in a kill switch please. I'm having a bit of a brain fart.  Kill switch is traditional two wire button one one wire normally goes to ground.

 

Any advice very welcome

 

Nick in sunny lytham

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bantammad
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June 19, 2020 - 2:21 pm
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Hi take the wire from the low tension side of the coil.or direct from the points to the kill switch then just conduit an earth ground test that should suffice,now you can kill the engine Les 

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nicbrrghs
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June 19, 2020 - 5:43 pm
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bantammad said
Hi take the wire from the low tension side of the coil.or direct from the points to the kill switch then just conduit an earth ground test that should suffice,now you can kill the engine Les   

Thanks Les all sorted cheers

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nicbrrghs
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June 19, 2020 - 5:54 pm
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I ve just cut the stem down as suggested on here and changed the ball bearings. Even though all tightened there is free play forward and back. I am presuming the races are wrong but dont know where to start with sorting this issue.

 

Any advice welcome

 

Nick

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Blue Heeler
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June 19, 2020 - 6:22 pm
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Hi Nick,

Yeah possible ball bearings are a size too small. Did you count them....from memory 24 each top & bottom, but I`ve not double-checked that.

...or is it a case of you running out of threads? In which case a suitable thick washer(read, spacer), may do the trick.

....unless you have such a miss-match of components that say, the stem can move in the race centres?. This may necessitate fitting different races or knurling the steering stem in the area it passes through the race centre. 

I`m now picturing(Mystic Meg impression)......incompatible cups v cones

Check out these possibilities and see how you go.

Blue

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nicbrrghs
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June 19, 2020 - 7:10 pm
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Blue Heeler said
Hi Nick,

Yeah possible ball bearings are a size too small. Did you count them....from memory 24 each top & bottom, but I`ve not double-checked that.

...or is it a case of you running out of threads? In which case a suitable thick washer(read, spacer), may do the trick.

....unless you have such a miss-match of components that say, the stem can move in the race centres?. This may necessitate fitting different races or knurling the steering stem in the area it passes through the race centre. 

I`m now picturing(Mystic Meg impression)......incompatible cups v cones

Check out these possibilities and see how you go.

Blue  

Blue,I didnt think to count them. Its sideways play forward and back. The stemnut is down tight, I've just ordered some bigger ball bearings so hopefully they may help

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Megga
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June 23, 2020 - 7:11 am
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Love the look of that, its spot on. Can I ask why the shrouds on the fork slider?

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Blue Heeler
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June 23, 2020 - 7:17 pm
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BSA/Triumph made them that way, sort of an afterthought add-on to top of fork  leg, a seal holder - come - external spring cover. Another version of the heavyweight forks had internal springs.

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