SOHC.co.uk Forums > CB350/400
Rotor removal tool
Sprocket:
--- Quote from: Nurse Julie on May 10, 2019, 09:30:44 AM ---
--- Quote from: heliwilly on May 10, 2019, 09:15:55 AM ---That's the problem. If you look on the internet it gives various sizes, 16mm 18mm and 20 mm. Short of buying them all, how can I find the correct one for my brothers 1977 CB400,
Does anyone have the correct answer? Thanks Bill.
--- End quote ---
18mm x 1.5 pitch
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This is correct - big bolt - wind in - pops off.
taysidedragon:
--- Quote from: matthewmosse on May 10, 2019, 09:31:12 AM ---Might be an idea to buy a cheap vernier caliper and set of thread gauges. I find mine invaluable, so much so I now have more than 1 set of each. Often a set of thread gauges is included in a tap and die set. Really useful on matric machinery and pretty well essential if you get anything British and old or Ammerican. The joys of a 196s British vehicle, whitworth, unf, unc, bsp, etc etc.get on those and it's a real headache.
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Agreed. These Hondas have a mix of standard and fine thread pitches so a set of thread gauges is essential. They only cost about £7 from Machinemart.
ka-ja:
For the purists, there is a difference between metric and imperial threads, the thread angle is 60degrees for metric, imperial 57degrees
heliwilly:
I got an 18mm x 1.5 for the CB400 and a 16 x 1.5 VW transporter wheel bolt ( Via Trigger) for the CB550. Bill W.
Orcade-Ian:
Sorry to pedantic but as ka-ja says they are different but the Imperial bit is even more confusing BSF (fine) and BSW (Whitworth) are actually 55 degree included angle not 57. But BA Threads often found on brass elec fittings are 47 1/2 degrees and have a metric based pitch system. UNF and UNC are 60 degree thread angle and their spanners are related to the distance across the flats rather than bolt diameter. No bloody wonder people use bolts in the wrong places and spanners which ‘nearly’ fit.
Ian
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