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Little BSA Bantam Trail Bronc
#789891 11/12/19 3:39 am
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She started as a mostly complete non runner. Missing some bits, that I didn't think would be hard to find. Engine needed a full rebuild, but I ultimately decided to tear into it myself. Kinda rare machine. been a fun little project.
Heres the "before"

Attached Files left-side.jpg20190604_114912_resized.jpg20190531_080708_resized.jpg1965-US-Western-edition8.jpg
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Re: Little BSA Bantam Trail Bronc
rocketscientist #789892 11/12/19 3:46 am
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I bought a triumph front fender the same width and the broncs rear, to replace the last 9" that someone had cut off in its well used past. I had a buddy at a paint shop help with the backyard painting duties....and the metal came out pretty good. Its only a rear fender, stays and tank that is painted. Everything else was either blasted and painted black or powder coated black. The seat cover its a two tone grey. Not available. So I asked an eBay vendor that sells reg bantam seats if he'd make one up for me in two tone grey....the anwer was SURE! same price! Not may parts suppliers here in the US, so I had to get the new muffler can, piston and some assorted hardware from the UK. Ignition is going to be an Electrex unit (no lighting) and a Mikuni VM22. I keep the monoblock in the box. Its was pretty well roached anyway.......

Attached Files 20190719_102323_resized.jpg20190718_212832_resized.jpg20190813_223953_resized.jpg20190813_223931_resized.jpg20190719_185426_resized.jpg
Re: Little BSA Bantam Trail Bronc
rocketscientist #789893 11/12/19 3:49 am
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two stroke engine with 3 spd. trans pretty easy to rebuild. Internals surprisingly good! primary drive very nasty though.

Attached Files 20190718_212740_resized.jpg20190718_212744_resized.jpg20190719_185510_resized.jpgIMG_9753.jpgIMG_9755.jpg
Re: Little BSA Bantam Trail Bronc
rocketscientist #789895 11/12/19 4:03 am
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a few other picts. Interesting note on the Jone WM1 front rim "Not exceeding 250cc" engraved on the rim. I've never seen that note before. But then again, I've never had a small displacement bike with a Jones rim........

Attached Files primary.jpgwheels.jpgjoneswarning.jpgchasssssy.jpg
Last edited by rocketscientist; 11/12/19 4:10 am.
Re: Little BSA Bantam Trail Bronc
rocketscientist #789928 11/12/19 7:20 pm
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Looks the mutts nuts. I love these little broncs. Very rare! Had the chance of buying one a few years ago and wished I did.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Little BSA Bantam Trail Bronc
rocketscientist #790104 11/15/19 2:54 am
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back as a roller!

Attached Files onwheels1.jpgonwheels2.jpg
Re: Little BSA Bantam Trail Bronc
rocketscientist #790115 11/15/19 7:29 am
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Looks like a great little bike and loads of fun off road smile


1968 A65 Firebird
1967 B44 Shooting Star
1972 Norton Commando
Re: Little BSA Bantam Trail Bronc
rocketscientist #790129 11/15/19 1:24 pm
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Done a great job of the rear guard repair, do you have any more photos?


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Little BSA Bantam Trail Bronc
rocketscientist #790204 11/16/19 3:09 am
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A little more progress. seat cover on, piston / barrel set.

Attached Files seatdone.jpg
Re: Little BSA Bantam Trail Bronc
rocketscientist #792504 12/10/19 2:22 am
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Fitted an Electrex ignition (no lighting), Mikuni VM22 (keeping the monoblock in the box). Into cable fitting phase. Throttle done. awaiting fittings for the clutch and front brake cables.
I was able to cut down a triumph front fender and weld it to the remains of the stock fender. Came out pretty nice, No chance of ever getting a good original, so a repaired one will have to do.
Engine got a .040 bore / new piston, new clutch plates, new primary chain, all new seals of course. Header pipe is original, muffler a D1 as fitted on prototypes. I have the original Trail Bronc fishtail...that may or may not go on.
Awaiting a 1/2 x 3/16 proper bantam chain from Jason the Chain Man in UK. No real good options here. roller size bigger than standard 420 chain....so that's out when keeping original sprockets.

I'm sure I'll sell it when done.....they all go that route.

Attached Files 20190719_102339_resized.jpg20190719_103312_resized.jpgcloseRS1.jpgcloseRS2a.jpg
Re: Little BSA Bantam Trail Bronc
rocketscientist #792531 12/10/19 12:40 pm
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Nice work!

If you have a strobe light, use it to make a note of where the igntion advance is going, there shouldn't be one as you know, I've only fitted one and the ignition retarded, completely discoloured a freshly chromed front pipe and ran like a bag of spanners. I have seen reports on Facebook from someone with a villiers reporting the same thing.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Little BSA Bantam Trail Bronc
rocketscientist #792532 12/10/19 12:44 pm
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In addition, you mention prototypes, on the original marketing they showed to have similar/same suspension to that on the early models with the upside down forks

Attached Files BSA-1965-Brochure-USA-06.jpg

Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: Little BSA Bantam Trail Bronc
rocketscientist #793449 12/20/19 3:11 am
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down to needing a front brake cable and fuel line! then.....just a wait til warm weather!

Pretty happy with the before and after. Hope it runs!

Departure from stock? Electrex ignition, Mikuni carb.

Attached Files finishrs2.jpgleft-side.jpg
Re: Little BSA Bantam Trail Bronc
rocketscientist #793607 12/22/19 1:12 am
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Very nice work. Great "before and after" pictures!


'64 TR6R Plus some Twins from other countries (U.S., Germany, Japan)
Re: Little BSA Bantam Trail Bronc
TR6Ray #793704 12/23/19 3:24 am
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Originally Posted by TR6Ray
Very nice work. Great "before and after" pictures!

Thanks Ray. these little oddball don't get no love from the "big bike" brit boys here.... lol
I wish there were more bantams or similar machines around here as there are in the UK. Its would be a heck of alot less expensive for someone just getting into vintage bikes.


Moderated by  Richrd 

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