There seems to be a resurgence in the 50cc ranks so I thought I would post up how I am going about mine ( Johns ).
John Steer got hold of the ugliest Honda MTX50 you would ever wish to see, it was a rescued beach toy and was very neglected. John put an FXR front end in and also modified the original swinging arm to accept an FXR rear wheel.
The first trip to the track we found it was restricted in 5th and 6th gears, the culprit was traced to an electrical jobbie that was rotated by the gear change inside the case. It was a simple job to remove it and plug the hole. We just had to rotate the unit until it would rev out in all gears.
The next time at the track I entered F5 and finished a nice solid last as it is very slow, I did have race long battles with a Honda 100 foul stroke to keep me interested.
I have a mb100 on my shelf that is donating it's reed block and it's carb ( a nice 28mm pwk ) and I have gotten hold of a couple of MX pipes to try and cobble up a less restrictive exhaust.
I have just lucked across a spare engine and the cylinder looks to be ok ( it is 1mm over though ) but the crank needs a rebuild as the big end is shot.
I have plans to try make a Scitsu type frame ( lego bike for you Dave ) and have a contact in UK who is hopefully going to give me a bit of help with the dimensions.
Like all my plans it will probably never happen and I'll be the new Ivan, but you never know.
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