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Thread: Race chassis

  1. #31
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    Quote Originally Posted by Grumph View Post
    I'm pretty sure the Westoby's in timaru had a waddon/EMC/rotax similar to that one.

    They built a yamaha 100 powered bucket with a copy frame too - a friend of mine bought it a few years back but had to wait to pick it up until they'd made a new seat/tank unit as they'd simply switched the 125 unit between bikes.
    They had access to a mould for that unit.

    I do spine frames for the aermacchi replicas - not surprised that what was felt as front end chatter came from the rear...they are "different " to set up.
    Some of Grumph's handy work.
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  2. #32
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    Waddon pics

    Some Waddon stuff i posted elsewhere
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  3. #33
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    Quote Originally Posted by husaberg View Post
    Some Waddon stuff i posted elsewhere
    How simple is that?

  4. #34
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    Astralites stuff

    I had this Dave brought them up on a previous thread they belong here more then the 2 stoke thread.

    interesting stuff bellow the breasts as well 3 vs 5 spokes alloy vs carbon fibre why the original Astralights were stopped, solid vs spoked etc
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  5. #35
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    Quote Originally Posted by husaberg View Post
    Some Waddon stuff i posted elsewhere
    Can anyone date the b/w pic? I am collating evidence to get a log book for Period 5 racing in Australia. I have a Rotax and a Kawasaki AR125 motors to put in there.I want to gather some evidence before I jig up for the frame.
    I was lucky enough to contact an Engineer who worked for Erhlich , who confirmed the 125/250 were available in 1981.
    Any help greatly apprecaited.

  6. #36
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    Quote Originally Posted by Grumph View Post
    It's not frame flex - OE frames spines are 65mm OD X 6 mm wall ---yes, six millimeters.... My replicas are 3 inch OD 2 mm wall. Either are plenty stiff enough. Frame weight is not bad either...one of mine was weighed at a Post Classic meet at Manfield a few years back - 215 lb with a gallon or so of fuel on board....not bad for a 350 pushrod single.
    Could you use the internal space in the spine (or part of it at least) as the fuel tank? Maybe save yourself a kg or 2 in tank weight.
    Hilleye

    If it doesn't bring a tear to your eye, add a little more fully synth 2T to the mix.

  7. #37
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    Quote Originally Posted by 2T Institute View Post
    Can anyone date the b/w pic? I am collating evidence to get a log book for Period 5 racing in Australia. I have a Rotax and a Kawasaki AR125 motors to put in there.I want to gather some evidence before I jig up for the frame.
    I was lucky enough to contact an Engineer who worked for Erhlich , who confirmed the 125/250 were available in 1981.
    Any help greatly apprecaited.
    Yes i can date the article the pic came from i will post the whole article it has the armstrong the Waddon the Red Rocket and the EMC.
    I will see where i have put it the others are ESP the Spondon or was it Harris frame and the semi Monoque are interesting if not as simple as the Waddon.
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  8. #38
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    Quote Originally Posted by Hilleye View Post
    Could you use the internal space in the spine (or part of it at least) as the fuel tank? Maybe save yourself a kg or 2 in tank weight.
    The biggest problem with these style frames is accommodating the carb in a non rotary valve engine. Obviously not asn issue on a Rotary valve. The frame ends up needing long plates to join the spine in a straight path from the steering head to accommodate the swing arm which in terms compromises the simple concept.this is with a reed valve I hope this makes sense.

  9. #39
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    Waddon links here with detail pics

    This from Jackie Paterson in Ireland, "this photo is of the first customer waddon I sold. The guy on the right bought it for the great Gary Cowan in 82. He drove to waddon himself to get it and brought it & 2 more back for me. The others went to Bertie George for Robert Dunlop and Brian Hewitt to ride. He still owns it. The other went to Donny and Neil Robinsons brother Nigel who sold it to a friend Noel Gault who still owns that one. Obviously popular the 125 as the original owners still have them or want them back. The guy on the left is a friend of mine who restored the bike. Henry Stewart the owner got the bike back in a rough state from a guy Freddie Rowen in the south who believe it or not was sponsored on it by the edge from U2! Theres a short history for you lol"

    Ken McIntosh
    Ken McIntosh build a spine frame for the Rotax twin in between 1980 and 81. It won the NZ 250 tt with Mike Pero ridding the bike. The bike was built for Andrew Mclaren it featured a 75mm spine in 16 gauge and weighed 6.4kg all up it was twin shock as per Kens style at the time. Ken also did at least one Egli replica that Hugh Anderson won the BOT series against the Ducatis etc in around the same period.







    http://2stroker.createforumhosting.com/viewtopic.php?f=11&t=1040&start=0&&view=print

    http://teamheronsuzuki.blogspot.com/...nd-rgv500.html
    http://www.tzracing.btinternet.co.uk/page7.html
    http://www.fondseca.com/index.php?ma...oducts_id=1087
    http://cybermotorcycle.com/euro/wiki..._Products.html
    http://www.waddon.me/members/
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  10. #40
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    Quote Originally Posted by Hilleye View Post
    Could you use the internal space in the spine (or part of it at least) as the fuel tank? Maybe save yourself a kg or 2 in tank weight.
    Yeah, it's possible - but think about an inclined spine under brakes, interruption to the fuel flow, yes ? This is why I've never used them as oil tanks on 4 strokes. The Egli horizontal spine is used successfully as an oil tank - but that one is shorter and easy to insert baffles before closing up.

  11. #41
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    Thanks for that Husaberg

  12. #42
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    posted for Grumph

    Cotswolt and Grumph i guess know people in common

    this is Grumph talking BTW
    the story as I've been told it....Pa Westoby went to the UK in the late 70's. Saw the waddon/EMC Rotax that were being raced.

    Took pics - and maybe did a sly measure up as well. Came home with two Rotax 125 motors - and it would seem a seat/tank unit as well.

    They built two 125's and a spare frame as well. The two sons raced the 125's quite extensively. Some time pre 82 the third frame was turned into
    a bucket with a 100 Yamaha motor. The original motor which the current owner still has uses a piston port water cooled barrel which is believed to
    have been cast from Jim Cashman's patterns for the C3 barrels. Currently a reed valve barrel is fitted.
    For the younger ones - the C3 was a Timaru built 350 three based on Suzuki 380 crank and cases. water cooled barrels of course.
    In the support 350 class of the Marlboro Series Jim Landrebe riding the C3 beat the reigning 350 World Champ, Chas Mortimer.
    Cashman was the first really good NZ based two stroke tuner.

    The last time we spoke to the Westobys they still had the two Rotax 125's tucked away. Lex who had the bucket was finishing off the
    replica motor for the Richard Pearse aircraft which was finished in time to fly for the anniversary of Pearce's flight.

    The problem for the owner of this bucket is just what to do with it....it's such a historic piece of work. Bringing it up to date with 17in wheels etc
    is not really worth doing. I've suggested restoring it nicely and running it at the occasional CAMS meeting.

    Husaberg - post this if you like - or just hold it for your archives....
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  13. #43
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    bits that wouldn't fit above.

    Bits that wouldn't fit above.
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  14. #44
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    stolen off a website for anyone intrested in building a rs type frame


    What is a Minimono?

    As the name suggests, a Minimono is a smaller race bike, and they are generally based around 125 Grand Prix bike geometry and proportions. They are typically specified as follows:
    • Approximately 22° to 24° steering head angle
    • Wheelbase in the vicinity of 1215mm to 1270mm
    • 2.5” x 17” front wheel and 3.5” x 17” rear wheel, running on 125GP slicks (or intermediates or full wets in the event of rain) from any of the tyre companies
    • A seat height of approximately of 700mm to 730mm
    Blindspott are back as Blacklist check them out
    www.blacklistmusicnz.co.nz

  15. #45
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    Quote Originally Posted by Ivan View Post
    stolen off a website for anyone intrested in building a rs type frame


    What is a Minimono?

    As the name suggests, a Minimono is a smaller race bike, and they are generally based around 125 Grand Prix bike geometry and proportions. They are typically specified as follows:
    • Approximately 22° to 24° steering head angle
    • Wheelbase in the vicinity of 1215mm to 1270mm
    • 2.5” x 17” front wheel and 3.5” x 17” rear wheel, running on 125GP slicks (or intermediates or full wets in the event of rain) from any of the tyre companies
    • A seat height of approximately of 700mm to 730mm
    Ivan did you read the whole article?

    http://www.supermononewsletter.co.uk...ermono-History

    Constructing a Minimono requires a similar approach, but before embarking on a build it is probably a good idea to look at the types of Minimonos that have so far been constructed. First, there is the original Minimono; this consists of a 450cc motocross engine, sometimes bored and/or stroked slightly, with power outputs ranging from approximately 47 to 65BHP depending on the amount of tuning. The second type is sometimes referred to as a ‘Micromono’; these use 250cc motocross engines, which have outputs from 37 to 45BHP. The potential advantage of this configuration is that as the engine typically makes up such a large proportion of the bike mass, a significantly lower weight can be more easily achieved by employing such a small engine. The third option is sometimes referred to as a ‘Midimono’. This is a ‘Mini’ rolling chassis with a 450cc to approximately 660cc engine, such as the Rotax 604, Honda XR650, KTM’s 610 and the new KTM 690 series (653cc), having power outputs from approximately 55 to 75BHP. Sometimes the chassis is slightly ‘stretched’ to give the correct weight distribution once the bigger, heavier engine has been fitted. Consequently this gives a larger rider more room to fit on the bike, whilst still maintaining the agility that is a characteristic of the narrower wheels and tyres.

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