wayne_weedon

Yes you are probably correct I was dealing with failing memory or thinking Bultaco again! the 349 is more over square though. Wayne...

Will be interesting to see what it makes anyway. I'd actually find it interesting even if not productive to build a Bantam based trials bike oneday, I probably have enough parts to almost complete one. Also like to see the above mentioned articles. Wayne...

Main difference engine wise was the 349 was a shorter stroke. More over square. Wayne...

A good panel beater might be able to get to the dents, thats an art in itself. Trials swingarm spindles can be a total SOB once they have corroded in their bushes etc. Dont beat the life out of it. I have found in the past the best way is to sacrifice the spindle by carefully drilling into the two ends just a little under the diameter of the spindle just past the mounts on the frame. You got to make sure you are drilling concentric with the spindle. That usually allows you to break it free and work on getting the rest out on the bench. Does the spindle pass through the rear engine mount on these TY's? Wayne....

How can you lose at that price! Nice bag that one... Looks like it needs a complete strip down and rebuild but there isn't much to strip down on a trials bike. Wayne...

I wonder if anyone has seen the magazine quoted "British Bike Mechanics" Not sure but I think that was a very short lived mag. That might shed some light on it. update: Result of a quick Google session BRITISH BIKE MECHANICS MAY 1988 No8 BSA ROCKET 3 TEST – PROJECT NORTON COMMANDO – HOW TO BUILD A TRAILS BANTAM Wayne...

I reckon someone pilfered some of the pics though, either that or the bikes are the latest Stealth or Cloaked versions It's a really good thing though Andy, and I may even post myself once I have them prettied up for the camera! But seriously on the subject of the spate of bikes vanishing in Yorkshire?? Or wherever, a few people seem to think they have been followed, if that's the case I can imagine a bit of a setup scenario might work to catch the culprits. Wayne....

Does it still stick when the nuts are slackened off? The plastic spacer/insulator is prone to becoming compressed and no longer flat over time and causing the carb to distort when pulled up snug. You may only need to correct the spacer. Wayne....

No Idea, but looks fairly "developed"!

Check you have the correct plug fitted, then check your ignition timing. You may need to retard it just a little.

It sure is pretty as they all are generally. I'm no Honda expert either! But I know it's been on ebay previously and didn't meet reserve, so either the money is not out there or it's perceived value is higher than it's real value. Wayne...

Not handed. But do make sure you ask for and GET Bearings with C3 clearances, A stock bearing (not c3) will probably end up too tight after fitting.

It's hard to say what year my own HiBoy was, it was something like a M49 engine and I can verify that when I bother to dig out the crankcases which is the only thing left of that bike. They were not all built up as complete bikes at Millers, some were just sold as frame kits, so any year engine could be fitted within reason. My own had just about all the Miller "Stuff" Alloy silencers etc etc. I seem to recall there were at least two distinct production runs of the Bultaco HiBoy but I'm not totally sure. Wayne...

That Helical Action actuator should be available fairly easily. There isn't an awful lot of room to engineer as elegant a solution. Those things are quite compact. Why use the clutch Wayne....

I think most people are using a photo host service like flckr or photobucket. I have used a my own webspace to do the same thing. Wayne....

Quite sure the hubs in Dave's pictures are Stock Bultaco. Yours look to be Rickman Hubs, same as my long lost HiBoy Bultaco had. Wayne...

Shame it only lasted about 2 minutes too! Wayne...

Yes many bikes do use Magnesium, so the risks should be understood by the manufacturers Magnesium can be corrosion proofed in various ways. But it's nature means it will corrode badly if it's not dealt with. I machine a lot of it and in one example of 3d machining a billet small engine crankcase a few years ago, we even noticed the change in colour of the material machined at the beginning compared to the material cut towards the end of the 12 hour machining cycle. That was cut dry in a workshop with low humidity too. Add water and dissimilar metals in contact and the case worsens dramatically. Wayne...

Sounds like they didn't do much R&D on materials! Mag castings at least need to be put through a Chromate conversion process and then painted, or even better Hard Anodised to give the material half a chance of surviving. Do they fail around bolt hole more so than anywhere else? Galvanic corrosion can attack Magnesium quick too. Wayne....

I have always fitted stock Dowty type lip seals, and never had any problems. Wayne...

Hard to see whats going on there with that end on view. Has the end of the crank been cut off? Don't see a centre hole there now. I expect sometime in the distant past someone has tried to get the pinion off, and they are incredibly difficult to remove, and mangled it in the process. Was there a nut on the crank that side? Wayne...

Nothing specific. But take a look at this table which may help. http://www.npfasteners.com/pdfs/max-rec-ti...ning-torque.pdf

Depends on how it's failed. You will get a weak spark or none depending if it's failed open or short circuit. The carb insulator is there to stop too much heat being transfered into the carb and causing problems similar to what you describe, but usually more an issue on 4 strokes in my experience. Wayne....

As previously stated possibly condenser. Also do you have an insulator between the carb and barrel? Wayne....