SOHC.co.uk Forums > CB750
The F2 Restoration
UK Pete:
Hi i made a bit more progress today on the restoration, i fitted the swingarm bearings, then fitted swingarm, centerstand and side stand, battery box with some of the electrics,inner guard,oil tank, and top and bottom yolks, also i have received my new SS valves and guides from USA, the head is blasted and old guides removed so i am ready to press in the new ones and grind the valves in, the top crank case is blasted, just need to find the time to blast bottom case, cylinders, and any other bits so i can spray them black, i have opted fro POR 15 engine enamel for the engine, as this seems to be the toughest finish, and totally petrol and solvent proof. I am a bit pissed off as i managed to snap off a tap in the crank case half when cleaning out the threads, so i am going to have to do the old MIG weld a nut on trick and hope that this works, there is also two broken off engine case bolts that were already broken off , i will either drill them or try the same nut welding trick.
Happy new year to all
Pete
pae:
--- Quote from: UK Pete on December 22, 2009, 03:58:30 PM ---...the finish at first glance is very good , but on closer examination I have noticed some rough spots, which happen to be right there on show on the RH main front down tubes, it looks like they have coated over a patch of grit, I suppose it is my fault in a way because this place does mainly commercial gates and railings, they do not seem to take a pride in the finish of pride and joy things like my frame it is all treated in the same way.
--- End quote ---
I had similar problems with a blasting company that was used to stuff that's more 'agricultural'. Painting was good, as the paint shop owner knew what he was doing (he'd restored his own Ducati so I felt in reasonably safe hands). Blasting was OK, as was paint, it's just that they used a very coarse medium and I'd think quite a high force, and didn't mask it well so I had to really work on tidying up the threads etc.
Who did you use btw, I'm looking again soon for my new project and want to know who I can, and can't, trust. I had mine done at Ditchling,
Phil
Spitfire:
It's really great to be at the stage were you can start to assemble parts, used to take a photo oif the F1 from the same spot after each session so I had a series of progress photos.
You probably know all ready but the car rubber and plastic cleaner works great on all the plastic bits, airbox etc.
Cheers
Den
UK Pete:
Today i decided to have a go at removing the broken tap out my engine casing, anyone who has ever broken one off and tried removing it will know it is a really awkward job , drilling is not really an option as they are so hard .
I started off MIG welding a blob on to the cleaned end of broken tap, i then placed a nut over the blob and welded the nut to the tap, once done i tried undoing it, but it sheared off a bit further down the tap, so i tried the same again and on the 5th attempt i managed to free up the tap and unscrew it , it made a bit off a mess to the case but nothing real serious, i am just pleased i got it put, i was not so lucky with the two snapped off bolts that i found that were already broken when i dismantled the engine, these two just would not move with the nut welding trick, so i filed one flat, center punched it and hand drilled with a drill bit half the diameter, i made a right F--k up of this the drill seemed to move off center a bit so when i drilled the next hole of the exact size it chewed off some of the casing on one side i must have drilled in at a bad angle. I will attempt to redrill and Helicoil the one i messed up, the other one i am going to leave as it is right next to the big 8mm through bolts that hold the crank cases together, my thoughts are that the engine showed no sign of leaking with both these bolts missing before, so it should be OK especially as i will have repaired one of them,
below is a picture of the removal of broken tap
Pete
Spitfire:
A pretty horrible job, always fraught with e danger of further damage or disasters, seems like you have got it sussed though and as you say if it didn't leak without the bolts then it should be OK.
Cheers
Den
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