danw43 Posted July 8, 2013 Report Share Posted July 8, 2013 Can anyone suggest a reason why it would be a bad idea to chop the down tube on a cub frame and replace with a thick sumpgaurd (as in how the upb and armac design frames are configured). Obviously id have to keep the frame straight while attempting this operation. I would hopefully have a 5mm pre formed alloy bash plate made and replace bottom of downtube with this,can anyone suggest any downfallls pitfalls to this operation. Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted July 8, 2013 Report Share Posted July 8, 2013 to do it properly you could do with a new engine mounting lug welding onto the rear of the gearbox and the current one maching off under the engine. Then again the age old Scottish question rears it's ugly head. Quote Link to comment Share on other sites More sharing options...
sparks2 Posted July 8, 2013 Report Share Posted July 8, 2013 (edited) Why go to all that trouble to gain about 3/4" extra ground clearance. Cutting the frame surely weakens it. The standard frame (on trials wheels and tyres) has great ground clearance anyway. Regards Sparks Edited July 8, 2013 by sparks2 Quote Link to comment Share on other sites More sharing options...
andy m Posted July 8, 2013 Report Share Posted July 8, 2013 I have seen it done and some quality Bantam frames have it. It could have been done back in pre 65 days, I dare say someone did it ??? Quote Link to comment Share on other sites More sharing options...
danw43 Posted July 8, 2013 Author Report Share Posted July 8, 2013 why do it,really,because i can and i enjoy doing this stuff,its my bike and i like to try different things on it, Ive seen it done on some frames, the lug on the gearbox,yes now i would need to do that,as for the Scottish issue,it isn't a problem,im in Yorkshire and ride in north lincs,problem solved. No real problems i can see so far. regards Dan Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted July 9, 2013 Report Share Posted July 9, 2013 Go for it then. As you say "because you can". Quote Link to comment Share on other sites More sharing options...
danw43 Posted July 9, 2013 Author Report Share Posted July 9, 2013 Just been thinking about the third engine mount,what is ti stop me chopping the original down,and creating a slipper that would be welded,bolted to the bash plate(a bit like how modern forks retains the disk on a front wheel brake plate),thus giving three planes of location? Would that create any problems? regards Dan Quote Link to comment Share on other sites More sharing options...
naichuff Posted July 9, 2013 Report Share Posted July 9, 2013 What do you do with the oil feed/return pipe next to the bottom engine mount or do the later crank case differ? Quote Link to comment Share on other sites More sharing options...
hewson Posted July 9, 2013 Report Share Posted July 9, 2013 Dan , bring along a camera to Poachers and take loads of photo's , ask people for info and idea's . Dan if i was you , i would get rid of the cub , and get a Mz like Al , test bike available to ride on sat- sun at Walcot's . Al will be taking order's ....See you soon Keith Quote Link to comment Share on other sites More sharing options...
danw43 Posted July 9, 2013 Author Report Share Posted July 9, 2013 Ah but i love the cub,its only because i like tinkering.,As for oil feed, either leave as is or you could recess it if its a real worry,but i dont personally see its a problem. Regards Dan 1 Quote Link to comment Share on other sites More sharing options...
danw43 Posted July 9, 2013 Author Report Share Posted July 9, 2013 I have just been looking on the bsa otter site and you can attach the bottom mount to the bash plate,easy fix,saves a lot of messing about think im gonna go in that direction Quote Link to comment Share on other sites More sharing options...
old trials fanatic Posted July 10, 2013 Report Share Posted July 10, 2013 Wait till the first time you slam her down real hard onto a pointy rock at just the right spot Quote Link to comment Share on other sites More sharing options...
sparks2 Posted July 10, 2013 Report Share Posted July 10, 2013 Wait till the first time you slam her down real hard onto a pointy rock at just the right spot Exactly Quote Link to comment Share on other sites More sharing options...
danw43 Posted July 10, 2013 Author Report Share Posted July 10, 2013 if thats the case and its gonna bend a five mm compound bent piece of alloy and a engine mount,surely itll bend a single piece of alloy and screw it any way? Quote Link to comment Share on other sites More sharing options...
b40rt Posted July 10, 2013 Report Share Posted July 10, 2013 if thats the case and its gonna bend a five mm compound bent piece of alloy and a engine mount,surely itll bend a single piece of alloy and screw it any way? One way to find out, your engine. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.