July 8, 201313 yr 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.
July 8, 201313 yr 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.
July 8, 201313 yr 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, 201313 yr by sparks2
July 8, 201313 yr 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 ???
July 8, 201313 yr Author 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
July 9, 201313 yr Author 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
July 9, 201313 yr What do you do with the oil feed/return pipe next to the bottom engine mount or do the later crank case differ?
July 9, 201313 yr 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
July 9, 201313 yr Author 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
July 9, 201313 yr Author 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
July 10, 201313 yr Wait till the first time you slam her down real hard onto a pointy rock at just the right spot
July 10, 201313 yr Wait till the first time you slam her down real hard onto a pointy rock at just the right spot Exactly
July 10, 201313 yr Author 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?
July 10, 201313 yr 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.
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