LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Sept 5, 2023 12:40:57 GMT
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I figured I'd best start a new thread for this I've shelved the Mini Mini Scamp for the time being to concentrate on the actual Scamp as what I have planned will take a fair bit of fabrication But I still need toilet transport I really enjoyed knocking about on the Tomos, 2 wheels really smoothed out the rough ground, so I figured a motorbike it should be. But you know, motorbikes are boring, mopeds are obviously much cooler, but still, you can just buy them, also I really wanna build something. Which brings me to one of these, a Mini Bike. As popular in America as shooting up a primary school, but weirdly not over here  I just so happen to have a 75cc Suffolk Punch engine as you do. It's got a nice vintage look to it, probably because it's pretty vintage  It makes exactly fuckall power, but it pop pop pops along whilst doing so, so it's ideal Mini bikes appear to mostly use 10inch barrow wheels, so a good place to start is to buy some of them. But hold on, driving up the road the other day I spy this dumped along with some other bits of steel on someones driveway. I of course stole it  What I have there is a Wolf Garten Scooter What that means in reality is I have 4 10inch barrow wheels, 2 of them are attached to an axle with a differential, the other 2 handily have roller bearings I also have a working 190cc engine and a Peerless 3 speed/R gearbox, but they'll get sold for cash money The choice now is, build a 2 wheel Mini Bike as above, or use the axle to build a Sidecar Mini Bike like this  I kinda like the fact i'd be able to stop and leave it somewhere without it falling over if it was 3 wheeled, plus it makes it eligable for the Sunday track run, so lets make it 3 wheeled. The 'Scooter' died for this, but i'm not bothered, it was an odd thing and it was free anyways    Let me have your thoughts, persue with the sidecar (it wont have a cooler on it) or make it 2 wheeled? |
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Sept 5, 2023 19:05:27 GMT
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I’ll just leave these here just in case.   |
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jimi
Club Retro Rides Member
Posts: 2,219 
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Sept 5, 2023 19:19:17 GMT
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Three wheeler gets my vote  less mainstream than 2 wheels 👍 |
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Black is not a colour ! .... Its the absence of colour
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93fxdl
Posted a lot
Enter your message here...
Posts: 2,019
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Sept 5, 2023 21:21:17 GMT
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Hide the engine inside the cooler, have a hamster wheel where the engine would normally be, for extra mayhem, connect the wheel to the axle, so it turns as the trke moves, with a fake hamster inside it
Ttfn Glenn
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Calm down lads 😂
It'll do about 10mph, not sure Punch engines are known for putting out huge horsprs.
A hamster wheel?
Can I have some of what you're having 😂
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Sept 6, 2023 14:47:14 GMT
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There is another option Use the 2 barrow wheels and build an ever cooler version of the Welbike ParaTrooper bike  We have a 140cc PitBike engine, so it would be hilarious, proper 5 speed, manual clutch jobbie I've played with PotatoShop and I reckon with short bars and maybe a cafe seat it would be nuts  Yeah, it's not quite the vintage mini bike, but If we kept the frame tight around the engine and use the 10inch wheels (pretty sure the Welbike has 12s) it would still be tiny |
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Like this Lambretta sprinter with "rear set" pegs and brake set up on the rear axle
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Sept 12, 2023 14:00:16 GMT
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Right! The plan has been made I'm building a vintage 'Tom Thumb' mini bike using the Suffolk Punch engine The frame we'll be copying  Now my wheel and tyre combo are a little bigger than the ones shown. They're still 4 inch wheels, but the tyres are a little bigger in diameter and width Vintage bikes seeming use an 8.5 inch tyre with a 2.5-3 inch width, the ones I have are 10 inch diameter and 4 inch width. So it will still look the same, but i'll have a bit more comfort and ground clearance. I've 'mocked up' the length i'd like it to be - I say mocked up, place a wheel either side of an engine isn't taxing - and hopefully I can keep the axle centres at 600mm like they are here, or hopefully even shorter.  Some pictures of the powerhouse, no doubt just for my reference, but hey.     The engine dimensions (again for reference) 310mm from engine mount to top of sparkplug 300mm width from pull start to end of crankshaft 270mm front to back (including carbs and exhaust) 110mm engine plate width, you can set the engine between frame rails to a depth of 18mm to lower engine 36mm crankshaft length The engine is 75cc and makes roughly 1.1hp at 3000rpm They make the most awesome sound at idle as can be heard in this video @ 35 seconds in I think it will probably do around 12mph - perfect |
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brachunky
Scotland
Posts: 1,339
Club RR Member Number: 72
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Sept 12, 2023 20:09:41 GMT
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Please stop filling my head with this  I have a 5.5hp side shaft motor on a rotorvator which is would do  |
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Sept 12, 2023 21:02:45 GMT
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Please stop filling my head with this I have a 5.5hp side shaft motor on a rotorvator which is would do Certainly don't Google tiller racing |
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Sept 13, 2023 8:18:11 GMT
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Was having a look online as you do and was marveling at how short these things are, mine at 600mm is larger than I wanted, but it just wouldn't fit any shorter. Hold up, i'm an idiot, lifted the engine up to its final height and rolled the back wheel under the carb I've now got an axle to axle length of 540mm - sweet   |
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Sept 13, 2023 10:38:04 GMT
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Nearly finished then! Excellent, love your "little" builds!
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1968 Mini MkII, 1968 VW T1, 1967 VW T1, 1974 VW T1, 1974 VW T1 1303, 1975 Mini 1000 auto, 1979 Chevette, 1981 Cortina, 1978 Mini 1000 1981 Mini City, 1981 Mini van, 1974 Mini Clubman, 1982 Metro City, 1987 Escort, 1989 Lancia Y10, 1989 Cavalier, 1990 Sierra, 1990 Renault 19, 1993 Nova, 1990 Citroen BX, 1994 Ford Scorpio, 1990 Renault Clio, 2004 Citroen C3, 2006 Citroen C2, 2004 Citroen C4, 2013 Citroen DS5. 2017 DS3 130 Plenty of other scrappers!
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LowStandards
Club Retro Rides Member
Club Retro Rides Member 231
Posts: 2,716
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Sept 13, 2023 12:30:33 GMT
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Managed to grab a quick ten mins at lunch and did all the CAD work  And by CAD work, I do of course mean, laying everything on its side on an old piece of kitchen worktop and drawing round it  I then looked at the picture of the frame i'm making. Nice curve at the back, what do we having in the garage, ah the Scamp steering wheel. Drew round it to get the main shape of the frame, then filled the other bits in with a ruler.  So, it's tight, real tight, but these bike are meant to be. I'll have to get creative with the jackshaft location to gear it down, but I think we're good to go |
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Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,348
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
Mk2 MR2 T-bar - E46 328i - Skoda Superb - Fiat seicento - 6n2 Polo - 6n polo 1.6 - Mk1 GS300
EU8 civic type S - MG ZT cdti - R56 MINI Cooper S - Audi A3 8p - Jaguar XF (X250) - FN2 Civic Type R - Mk2 2.0i Ford Focus - Mercedes W212 E250
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merryck
Club Retro Rides Member
Posts: 480
Club RR Member Number: 9
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*Clicks on a link to a site called Big Tyres* *Is shown a lot of very small tyres* Hang on a minute... |
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Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,348
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
Mk2 MR2 T-bar - E46 328i - Skoda Superb - Fiat seicento - 6n2 Polo - 6n polo 1.6 - Mk1 GS300
EU8 civic type S - MG ZT cdti - R56 MINI Cooper S - Audi A3 8p - Jaguar XF (X250) - FN2 Civic Type R - Mk2 2.0i Ford Focus - Mercedes W212 E250
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I wonder if glenanderson would be able to use your knowledge and access to weirdness’s |
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Davey
Posted a lot
Resident Tyre Nerd.
Posts: 2,348
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I wonder if glenanderson would be able to use your knowledge and access to weirdness’s My knowledge and weirdness is open to the entire RR community. Oh. I can also help you out with tyres... |
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K11 Micra x3 - Mk3 astra - Seat Marbella - Mk6 Escort estate - B5 Passat - Alfa 156 estate - E36 compact
Mk2 MR2 T-bar - E46 328i - Skoda Superb - Fiat seicento - 6n2 Polo - 6n polo 1.6 - Mk1 GS300
EU8 civic type S - MG ZT cdti - R56 MINI Cooper S - Audi A3 8p - Jaguar XF (X250) - FN2 Civic Type R - Mk2 2.0i Ford Focus - Mercedes W212 E250
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glenanderson
Club Retro Rides Member
Posts: 4,352
Club RR Member Number: 64
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I wonder if glenanderson would be able to use your knowledge and access to weirdness’s My knowledge and weirdness is open to the entire RR community. Oh. I can also help you out with tyres... I am aware of the BigTyres website. I’ve had a bookmarked page for tyres for my Austin for a while. I was not aware that the boss man there was a resident here though; that’s good to know. 👍👍 |
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My worst worry about dying is my wife selling my stuff for what I told her it cost...
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less mainstream than 2 wheels 👍
I have a 5.5hp side shaft motor on a rotorvator which is would do 
