Trials Australia Forums

You could probably get another rear 247 wheel for a lot less $$$ than it would cost to weld, machine and respoke yours. Other Cota models I have seen have different rear hubs to the 247. In the 1970s Montesa made their own hubs so are not a hub shared with other brands of bike. The 247 was a reasonably popular bike so you may have success with getting the right wheel.
It may be possible to fit a rear wheel from some other bike with minor modifications. Many share a similar overall width and many share the axle size of the 247. You should be looking for a wheel with drum on opposite side to the sprocket and same size axle. If you want to go that way you could go with your wheel to a wrecker and you would probably find a wheel from a little Jap trailbike that would fit, but you would probably still need to sort out axle spacers, brake drag link, brake rod/arm and a big sprocket, and make sure you can get the right sprocket off-set. Another one to try would be a TY175/TY250 wheel as they are quite common. The downside of this is that the bike would then not look original.
If you do go ahead and get your 247 hub fixed, it might be a good time to have the brake drum surface skimmed.
If the rapidly escalating cost of ownership is a problem, you should survey the whole bike and work out if you are willing to pay the price for fixing the things you haven't even discovered yet.

Looks like it has been bodged up before - it appears to have a steel sleeve and that is what has split. Cameron Scott in Coffs Harbour is going to have a look and get back to me.

Visited Cameron Scott in Coffs Harbour and left the wheel hub with him. Came back a couple of hours later and all fixed with new bearing fitted and only $10 - Cameron you are a bloody beauty , thanks heaps and I look forward to comparing our Cotas one day soon at Greg's place - he has a ride planned for Mother's Day - that sounds like grounds divorce proceedings to me....

keychange wrote:....... has a ride planned for Mother's Day - that sounds like grounds divorce proceedings to me....

Ummmm... I'm worried now. Is he married to his mother ? No wonder he wants to be off on his bike !!!!!

no but his wife has a mother - the medusa in law.. offend the medusa at your peril!!!

Well after all that here she is - not concourse by any means - but I bought her to ride not to look at. Fingers crossed everything currently appears to be operating as it should - So I have just taken it for a ride up some serious hills and climbs and falls - hooray, it stayed together and went great

Hi, below is a tech article from Rocky Mountain Montesa on setting the timming
http://rmmontesa.webs.com/techarticles.htm#545031309

The kick starts on the 247,348,349 bikes are rock solid as they are the same just about in all large block montesa engines. The 123, 172, 200, 242 series does have a design issue which was never fully solved.

The rear hub is also common across several models including the 172/200 series and probably the 242 series just turned over.

Greg