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18 mil 72 mm bore DM available?


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I'd seen the wider bores in the Mattoons.Where I got the idea of dropping other cylinders.I really do have clearance issues with pipes as the displacement gets bigger than 600 or so I wanted as much as possible out of as little as possible.

 

Better to stay with readily available stuff where I can.Thanks for suggesting the call to CP

 

If it's only a matter of stud alignment then it would depend on if the billet cases have enough meat in the right places to drill them in the right place.Match the upper to the cylinders and go with it.

It is going to need a crank,cylinders,pistons and heads anyway no matter how it goes.

 

I agree that custom one off cases are out.The CAD time and and labor would be as much as Mattoons alone.

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i think it would be more than a matter of stud alignement. im sure those spread bores cases were intended for larger cylinders of +85mm, according to the website anyways. the machined area for the cylinder skirt will likely be all wrong for what you need, as will the transfer area. and its anybodys guess what diameter crankwebs theyre machined for. if you could get a set of cases with the top half and crankshaft area only partially machined then finish it yourself you might be on to something but other wise i see alot of welding and epoxy needed and remachining when the weld heat warps the piss out of em. better off to stay with bolt together matching parts imo

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I hadn't thought of having them only partially machine the upper,awesome.

 

I was planning on using a crank made for the cases in any final configuration,then find a piston with the right wristpin diameter and pin height.We used to mix and match TR,TD,TZ and RD parts to get up to 423cc RDs.So I'm used to piecing together frankenbikes.

 

Worst case would be to have an adapter machined to take up any excess transfer area and to match narrower cylinders.Some guys have done this to match 4 cub cylinders to a v4 RZ500 at up to nearly 800cc.

But thats 2 cranks,4 cylinders,4 pipes,carbs etc on top of an already expensive build(of rapidly dwindling parts).I'd have to buy a lot of shoes,pocketbooks and probly jewelry to get the wife onboard.

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I heard there was parts to build another one.Forgot if they went to the new owners of the bike or if jade was holding on to them.

There were 4 sets of cases made. Those are about the only thing really special. The rest you can buy with some knowledge, and some is the same ol shit that's in the rest of the big twins. You had better have a budget that begins with a 4 if you're going to build one.
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There were 4 sets of cases made. Those are about the only thing really special. The rest you can buy with some knowledge, and some is the same ol shit that's in the rest of the big twins. You had better have a budget that begins with a 4 if you're going to build one.

4? Like you mean....
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