FRANKENHONDA II the 1982 DOHC CB 750F2 Build

[cb250nproject]

Thanks for your positive feedback, I hope it’s worth the wait for all involved.

Well I just ordered the sprocket so that’s one less thing I’ll need to get once I’m home. Should mean I’ll have everything required to get that back wheel on and leave it on.




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[brad black]

Try Bob Martin Motorcycle Engineering down in Ferntree Gully for any welding needs.  I think he's the son of Bob Martin who welded and repaired a couple of TZ frames for me decades ago.

steve martin is all round speed works in pakenham.

https://www.facebook.com/All-Round-Speed-Works-1847635258797109/

[cb250nproject]

Well Old Man Murphy has been hitting it in the shed.

After an issue with measurement resulting in a Mark II being made progress of the top triple is coming along



I’m not sure what we were quite up to in the other updates. So I’ll start from once the holes were all in the right places.

Using the original GSXR 750 top triple as the guide, the old man remeasured it then mulled it out.

There are a few tricky features on the underside of the triple, on of them being the hole which houses the triple stem.

This meant the billet needed to be milled down to the correct thickness so it needed to have the face cut down from 25mm to 22 mm at .1mm a cut (30 passes it’s a slow process on the manual mill)

After a 30 mins of work 1.3 mm following day the face was at 22mm

After a quick check against the original triple everything lined up

Roughing down 2 mm so he could machine out the 3 bosses around the main holes

Then the mill gods decided work would be postponed

Bugger. #shoplife I’m looking forward to seeing the final piece it’s going to be mean. The only thing I’m thinking now is if I should leave the housing of the speedo black? I hope it ties in with the polished triple.




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[CrabsAndCylinders]

Very nice work!

[cb250nproject]

So thanks to a member here who volunteered their assistance the rear disc no longer looks so out of place

From plan to execution, absolutely legendary effort (my shout when your in Melbourne)

I think once I get home and paint the inner black it will look the business

The sprocket also arrived in the mail a few days ago. So once I pick up the studs and nuts I should be ready to get the back wheel sorted.

Next will be getting new brake lines to suit.



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[cb250nproject]

So this next update is courtesy Old Man Murphy who has been busy in the shed working on the top triple

So from the top down first photo is preparing to cut the boss, with the next holding the triple clamp onto the rotary table.

next is the boss rough cut, then cutting the boss at the other end, he then used a plug to center the next boss over the rotary table ready to cut the third boss.

When you look at the plug close up you will see the two different diameters cut one was to fit into the clamp and the other to center on the rotary table, the triple is now starting to take shape.

I cant wait to see the final result, it's going to look mean

[Jimbonaut]

Damn nice work.  I need me an Old Man Murphy.

[SONIC.]

Who needs a CNC, just get an OMM

[LightsOut]

Hell yeah, that’s craftsmanship. I want an OMM too.


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[cb250nproject]

I may have to get a sign made up for his workshop.

I’m now starting to think I’ll have to polish the black off the bezel of the speedo to tie into the polished triple it’s going to look a little strange with the black on polished I think.

I’ll have to wait until it’s finished to see.


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