D3 BSA Bantams engine overhaul Ep 6 of 6

Classic bike engine overhaul. D3 BSA Bantam engine overhaul by Oz BSA Bantams

[@stevesutton6093]

Thanks mate, I have just become possessed of a a beaut little D1 which is in half a dozen boxes so your videos are a real treat, I am also an aircraft engineer coming up on 50 years in the business so I get your procedural approach to rebuilding engines.

[@OzBSABantams]

Well I hope your restoration goes well

[@eric-yy2cq]

Really enjoyed the egine rebuild, greetings from England ps i use to work for quiten Hazel automotives in Redditch were they buily the Bantams i was told and sadly i signed on the Dole once at the old Enfield factory

[@josephleister9198]

Nice work...thank you.

[@retromechanicalengineer]

Fantastic finished product, the customer will be very happy with that. Best wishes, Dean.

[@OzBSABantams]

Thanks Dean......

[@AdrianWhyte]

Thanks for doing this bones, you’re a master and it’s a pleasure to learn from you!

[@OzBSABantams]

Thanks Adrian

[@mikee3360]

Great video, it’s inspired me to build up my Bantam as it’s been dismantled and boxed up for more decades than I care to remember. I’ve owned about 10 D1s & D3s over the last 50 years and the most I ever paid for one was £5 and now I can’t believe how much parts are and reel at paying out £40 for an ignition cam and that’s assuming I can find one!!

[@OzBSABantams]

Thanks Mike.......If you want to restore an old bike, you've got to be prepared to spend some money I'm afraid. But you also have to look at what recommissioned bikes are going for now days to. You certainly won't get a Bantam for 5 quid nowadays. Good luck with the restoration..........regards Bones

[@geraldfitzgibbon7428]

Ur attention to detail is top notch.the engine looks new there on bench

[@OzBSABantams]

Thanks Gerald I appreciate your comments.

[@michaelfirth1075]

That engine looks awesome. You’ve done a great job,those engines didn’t look as good as yours from the factory.😊

[@OzBSABantams]

Thanks for commenting............I appreciate it.

[@54macdog]

Cool, unique channel. Great work.

[@OzBSABantams]

Thank you very much!

[@MadMickey58]

What great videos. Many thanks for sharing your knowledge. These will help me to rebuild my 1949 engine.

[@OzBSABantams]

No worries.........I appreciate your comments and good luck with your rebuild.

[@GazCroton]

Thanks Bones - great information & a great series

[@wookie45nz]

Great stuff mate. Just stripped my 58 D7 trials 125. I will try you for parts. I'm in NZ.

[@OzBSABantams]

No worries at all Pete......Thanks for watching.

[@dpfordnewcars]

I really enjoyed watching the whole process. I would love you to rebuild my D14/4 but I caught your comment about being fully booked till 2024 and I’m in the UK. I wonder if there is anyone in the Uk that can rebuild a bantam engine to this standard?

[@OzBSABantams]

Try contacting Howard at Bournemouth Bantams or Michelle at Rex Caunt Racing as they might know a reputable establishment.. Appreciate the comments.

[@dpfordnewcars]

@@OzBSABantams thanks Tony, I just watched the whole 6 episodes again, a joy to watch your attention to detail. I’ve bought some parts for my bike from Rex Caunt racing and Bournemouth Bantams so I’ll give them a call. Thank you for the reply. Dan

[@philarbon7817]

Hi mate I'm after a bones electronic ignition system for my D7 do you ship to the UK.. cheers phil.

[@OzBSABantams]

Sorry Phil........We no longer sell units into the UK.

[@philarbon7817]

@Tony Farmer hi yes I did hear that you did a few years back but thought I might try my luck ,I've got a friend over there atm so I might see if she could bring me 1 back 😉 Cheers.

[@OzBSABantams]

@@philarbon7817 That's no worries, however there won't be any warranty support I'm afraid, as it's logistically too hard. Part of the reason I don't supply to the UK anymore.

[@graedonmunro1793]

really enjoyable. did i hear you say no head gasket??

[@OzBSABantams]

Yes that's correct. I don't run head gaskets on Bantams, however I ensure the mating surfaces are lapped perfectly flat.

[@kevinjerome4925]

@@OzBSABantams Does that not raise the compression and therefore count as a “modification”?!

[@OzBSABantams]

@@kevinjerome4925 The pineapple head Bantams (pre-53) didn't have head gaskets. The increase in compression would be marginal. The error in the castings of the heads from BSA would have more effect. I'm not sure where you're coming from in relation to a "modification".

[@kevinjerome4925]

@@OzBSABantams If the lack of a gasket meant that the compression was raised above the factory supplied specification and hence a power increase and performance, then for insurance purposes, this would be regarded as a “modification”. This would have to be declared to maintain valid insurance - just saying how it is!

[@OzBSABantams]

@@kevinjerome4925 Hi Kevin.......The removal of a gasket .005" thick would barely have any effect on compression ratio and increase in power on something that was purported to be 4.5hp. The omission of the gasket reduces the combustion chamber volume by .02cc. The variations in manufacturing tolerances on the head combustion chamber profiles by BSA vary way more than that in combustion chamber volume, therefore I doubt you'd have any insurance issues. I'm not sure where you are, but insurance companies in Australia don't class that as modification as it has no real measurable effect on performance. We are talking Bantams with a compression ratio of only 6.5:1......It's very low. Appreciate your comments..........

[@bartvermeulen6515]

Is in fact a DKW copy by BSA.

[@OzBSABantams]

Yep correct Bart. Plans were taken from DKW after Germany lost the war and many DKW 125RT copies were made in many countries. BSA decided to mirror image the DKW engine. Thanks for commenting.