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V6 motorcycle with two speed gearbox
This is my first original creation made using a significant number of newer (i.e. post 1994) and studless parts, mostly from the 8420. This is also my first motorcycle with a working gearbox - albeit only two speed.
About this creation




Neutral and oil warning lights on handlebars (even though there is no "neutral"). The grey element in front of the left footpeg is the gear selector - it slides in and out to change gear. In the main photo, the bike is in top gear (the cog on the right hand side of the bike is visibly disengaged).



The V6 engine is suspended from the spine of the bike. Since the frame is rock solid however, it still turns freely in first or second gear without a problem; the primary drive gear "hangs" just above the driven gear.
I ran out of yellow pistons - the middle one of the rear bank of three cylinders is an old dark grey one.



Two-speed gearbox from below. Gears are selected crudely, by shifting the grey element at the top of picture that holds the spindle bearing the large cog out to engage bottom gear and in to engage top gear. Bottom gear is a very high ratio of engine revs to rear wheel revs, whilst top gear would be direct drive if not for the reduction in the final chain drive. Bottom gear is engaged in the picture. The kickstand does not interfere with the operation of the gear shift when the kickstand is either up or down.
Unfortunately, the gears have a tendency to jump when the bike is pushed too rapidly; this is mostly addressed with a set of bushes on the stabilising rod above the gear change spindle which rest on the frame. At least the jumping of gear is mostly from low to high - as shifting would be when speed increases - so you could say it's almost an automatic gearbox if you felt really generous.



The front fairing of this bike is shamelessly nicked from the 8420 - it was a good fairing, one of the best features of that bike, it fit this bike with only very minor modification, and also I'm just a bit lazy. The mounting of the fairing to the front of the frame is much different to that of the 8420 however, as I wanted to retain a good degree of steering lock.



The big discs on this bike allowed the use of a slightly more elaborate caliper on the rear than usual. The rear swingarms however slightly let it down - the studless beams just look too flimsy in my opinion. Run out of studded ones by this point though !



Profile picture providing a better view of the construction of the frame.



Comments

 I like it 
  July 28, 2013
2 speeds on a bike? inventive and ambitious, I like how you try things to evolve on the models! nice prototype!
 I made it 
  November 13, 2012
Quoting kurt Soares Great bike Daniel! It seems you used similar ideias that you implemented on your "4 cylinder faired motorcycle" for the frame and engine mounts. Looking good with the studded parts, it reminds me of Ducati900ss :) Ive posted it on www.legotechnicmotorcycles.blogspot.com Nice regards
Thanks Kurt - I'm honoured to have a second creation on your blog ! I started this creation by making the frame first - as I'm not that familiar with the non-studded parts - and then attempted to add the engine. It took about three of four frame designs before I arrived at the one shown, which allowed the engine to be suspended from the top of the frame - allowing enough contact between the crank gear and the "driven" gear underneath it whilst keeping excess friction to a minimum to allow smooth transmission. Addition of changeable gears came at the end once I'd realised I had sufficient lateral space to play with in the intermediate gearing !
 I like it 
  October 21, 2012
Nice work with the gearbox
 I like it 
  October 14, 2012
Great bike, and it looks thoroughly engineered.
Daniel Wareing
 I like it 
kenneth rattledge
  October 9, 2012
interesting looking bike, although the steering angle looks a bit steep, nicely done.
 I like it 
  October 9, 2012
Great bike Daniel! It seems you used similar ideias that you implemented on your "4 cylinder faired motorcycle" for the frame and engine mounts. Looking good with the studded parts, it reminds me of Ducati900ss :) Ive posted it on www.legotechnicmotorcycles.blogspot.com Nice regards
 I made it 
  October 9, 2012
Quoting kenneth rattledge interesting looking bike, although the steering angle looks a bit steep, nicely done.
thanks Kenneth, I've just added a profile shot to give a better idea of the steering angle.
 
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LEGO models my own creation MOCpages toys shop V6 motorcycle with two speed gearbox


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