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Dirt bike 8291 with some basic modifications
I just acquired a pre-owned 8291 dirt bike with the odd minor bit missing, so I thought I'd give it the Wareing treatment. Those of you who are familiar with my motorcycle work will probably be able to guess some of what I've done with it !
About this creation
The underlying frame and forks of this model are basically identical to those of the original. It is however obvious that the panels either side of the tank are upside-down - this was the only way to make them fit given the changes to the engine !



My first disappointment with the "official" model was that, yet again, it followed the typical pattern of putting the front sprocket on the same axle as the rear suspension pivot. So, the front sprocket has been moved forward, and the rear suspension pivot backwards, to separate them.

Shot above also shows my effort at a rear brake caliper built into the swingarm.

Secondly, the original position of the drive chain outside of the rear suspension swingarms; the chain now runs inside of these.

The third major change is to the engine; the longitudinally mounted boxer twin engine has made way for an in-line twin mounted transversely.



Close up of front, showing the new mounting of the front mudguard done to remove the restraint of the steering that the "official" mounting posed; steering lock now considerably increased.

Also shown are the flex cables representing hydraulic brake hoses; at the top, these slide into the holes in the black element that makes up the lower steering yoke. When the front suspension is depressed, they don't bend like they would on a real bike, but instead these rise through those holes either side of the front fairing (they are unattached to anything at the top).

With the extra weight of the additional parts used here, of which there are too many to list this time, I thought it best to add an extra brake disc and caliper to the front wheel !

This shot also shows the mounting of the front of the cylinder block, and the crankshaft - both cylinders rise and fall in tandem on the same bearing.





Two views of the other side, clearly showing the drive chain inside of the left-hand side rear suspension swingarm.

The very large rear sprocket has been replaced with a 24-tooth gear. This was a) to provide acceptable chain tension and b) I thought the very large sprocket looked ridiculous given the relative diameter of the rear wheel !

The first of the two shots above also gives a view of the speedo and tacho clocks behind the screen replicated from my "yellow V twin motorcycle".

It also nicely demonstrates the greatly increased steering lock, whilst the handlebars are slightly narrower than the those on the "official" version by using a length 6 axle instead of a length 7.



View from the front, showing the new screen added with a headlamp. I think the number "1" came from the little red Go-Cart from around 1992.



Comments

 I like it 
  August 11, 2013
Now with more authenticity! Great work on this.
 
By Daniel Wareing
Add to my favorite builders


589 visitors
1 comment
Added August 9, 2013
 


LEGO models my own creation MOCpages toys shop Dirt bike 8291 with some basic modifications


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