SOHC.co.uk Forums > CB350/400
Spark erosion
Rob62:
--- Quote from: AshimotoK0 on December 28, 2017, 06:59:12 PM ---
--- Quote from: Rob62 on December 28, 2017, 06:32:26 PM ---I think he tried all that on a previous thread.... the pin is pot-hard. Looks like a strip down and off to a specialist toolmaker / precision engineer or the like, or failing that a replacement part. :-\
--- End quote ---
I agree on trying to drill but I would have thought you could TIG weld to the pin...not tried it myself though so could be wrong
--- End quote ---
Worth a try i guess
70sHonda:
I don't know if he'd work on a Honda, but Pete Lovell of Pete Lovell Developments does smaller jobs using spark erosion. He's a long standing Norton man but it might be worth a try if you get really stuck.
Laverda Dave:
Thanks for all the help and replies everyone. I had this problem before and tried everything mentioned then (and so did Huw who's a newbie on here, he welded a stud on and it broke. I tried the drill but the pin is so hard it didn't touch it. Thanks for the tip about Pete Lovell, I'll give him a try. The only way to get this out will be by spark erosion.
AshimotoK0:
I had two of the short cylinder head studs snap off slightly below the surface on my 750K0 ...I tried various attempts at welding a nut onto it (I even removed all traces of BZP with acid and then bead blasting the nut) but the nut kept breaking off. Then I watched a TV car resto programme where the guy welded a blob onto the top of a broken stud and kept building it up to a quite large unsightly blob ...then, whilst still really hot, he removed the stud with Mole grips...I have since tried this method on cylinder studs and snapped off brake fittings and it worked every time. The only thing I am unsure of as a novice welder is how weld will 'take' to a hardened pin.
royhall:
A hardened pin will be fairly high carbon. Will weld okay but may become brittle and snap off.
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