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1967 CB450K0 Black Bomber Rebuild - By Royhall
AshimotoK0:
Here you go lads from that download but only screenshots ...sorry ! ... Much clearer in the full Adobe pdf doc. Tons of other useful stuff on the 450 in that download too.
The 'rubber cap' they refer to is only on the very early versions of the regulator box (I have that type on my really early CB250K0's with the hydraulic cam chain tensioner). I think it insulates the stud of the thyristor that's used as a voltage clamp..probaby replaced by a non-stud type (plastic body) in later versions of the regulator. A thyristor is often referred to as an 'SCR' .. Silicon Controlled Rectifier ... it's what was also used in early Kawasaki etc. CDI's to discharge the HV capacitor into the ignition coil primaries.
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AshimotoK0:
One thing I am not sure about is if you permanently connect the nightime coil, whether the regulator can handle the excess power generated when riding without the main headlamp switched on. One of these days I going to de-pot one of those regulators and see how it ticks....although it woud be fairly easy to just design a new one with a much higher current duty thyristor. Thyristors were the new kid on the block in the 60's and hence were probably very expensive back then.
This one is rated at 32A and relatively inexpensive (probably cheaper on eBay but you coud gurantee the quality on this one).
https://uk.farnell.com/stmicroelectronics/btw69-800rg/thyristor-50a-800v-top3/dp/1057302
Bryanj:
I got an account with Farnell if you decide you need one(or two)
AshimotoK0:
--- Quote from: Bryanj on July 10, 2020, 03:39:40 PM ---I got an account with Farnell if you decide you need one(or two)
--- End quote ---
Thanks Bryan but I have had trade account for about 25 years with Farnell RS and Rapid and ordered parts this week from Farnell for a work job. TBH I probably already have a few beefy thyristors to try ... just don't want to reinvent the wheel though. There is already stuff out there but not researched yet. Like this DIY one. https://mastercircuits.blogspot.com/2010/11/single-phase-voltage-regulator.html
nigelrharris:
If I could put my twopence worth in. I have had a Bomber since 1971. The same one to be fair we have been through a lot including poor charging. I have now a charging system that is good enough to require a voltage regulator. I was getting up to 16 VDC which was too much for the AGM battery, its now at a constant 14v.
The basic system is a magnet that spins in a coil. The magnet had the starter clutch on it which could well have been a source of your issue.
The original coil may have had insulation leakages. It has three pairs of coils two are for Night time running and come in when you turn on the headlamp and one for day. I never ride without light these days.
I had the coils professionally rewound at a place in Sussex. Not the originals but the work better. I purchased the last NOS rotor from Silvers. Yes it was painful but worth it. I believe that you can get these magnetised too.
I have a new diode rectifier with significantly less internal resistance from RS it works a treat and is fitted to a heat sink along with the voltage regulator.
The biggest problem I had was the starter clutch had come lose in the past. It sounded like a run big end to be honest it was that bad. This had vibrates and partially demagnetised the rotor. Hence the change of Rotor. Cheap silicon rectifiers work well. I have a 20A fitted to an aluminium heat sink in the rectifier well this also takes the VR.
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