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Ive a 1972 CB750 (located in Australia) which Im restoring after 20 years of storage. I have the motor up to working order and have started on the electrics.
The Blinkers were not working. Replaced some globes, found some loose wires/connectors, and hey presto Ive got working indicators. They do take around 1 second to start working, but then work correctly. I assumed this slow start was due to the low current, as I was working on the bike without the engine running for sometime and assumed the battery (recently replaced) had lost some volts.
So then I start the bike, and what do you know, the indicators do not work at all. Turn the engine off and the blinkers work again.
I can not work out the logic of why the indicators will work whist the engine is not running, and then stop when it is running. The only factor that would change ( I beleive) when the motor is running is that there will be more charge in the battery/circuit.
So I assumed a problem in the winker unit. I got a new unit from my local Honda dealer. Unfortunately, everytime I conect the new winker unit, I blow a fuse. I now suspect I do not have the correct, replacement winker unit. Unfortunately the original winker unit on my bike (which does work when the bike is not running), does not have any indication as to its sepcifications (no volts, watts, amps, manufacturer etc.). It is a nice looking aluminium barrell with three wiring pins sticking out the top.
Therefore two questions:
1) if anyone has theroies on why the indicators work when the motor is not running, then cease to work when the motor is running, Id appreciate your thoughts.
2) If anyone has a similar model bike, I would appreciate it if you could give me the specifications for the winker unit, so I can purchase a replacement.
thankyou in advance.
Tim
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Answer to my own Question.
For no logical reason I replaced two bulbs, which I had not previously replaced because they were in working order, and hey presto, everything is now working fine.
Ive no logical reason as to why this worked, but now onto the next problem, brakes.
My other question remains, what are the specifications for the 3 pinned winker box on a 1972 CB750 (Australia).
Thanks
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Ay least you have answered your own question. Funny how these gremlins creep into the system and are relatively simple to fix. Where in Australia are you as I am in Perth and have a 1981/2 Honda CB750KZ that I brought from South Africa in 1983. In the process of doing a total ground up restoration over the next 12 months. As for your blinker unit sorry to say that I cant help you with that one, as my knowledge of 750 Hondas doesnt go back that far, but a reputable motor cycle electrician would be able to sort out the problem. How many Km has this bike done and what sort of condition is it in ???
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Im in Canberra.
My bike has a tired 60,000 miles on the clock. However somethings are not adding up. The frame number is from 1972 and the engine number is from 1974. This seems to large a gap for it to be the original engine. Furthermore, the engine does not sound or feel tired at all. It has a cam chain rattle but other than that sounds good once warmed up and idles around 1500rpm. One day I will get the head off and I suspect Ill find that it has been re-bored and is no longer a 750cc. Ive had it to 80 in my suburban street and I thought this was pretty good, till I realised it was 80 miles and hour. I did not anticipate a vintage bike being sooo powerful.
Also with a huge hole in the exhaust it sounds like a wonderfully out of tune V8.
The bike has not been dropped at all, however not much of it is original. someone turned it into a copper of some sort with a huge sissy bar and forward pedals etc. But not a classy chopper. The tank has been re-sprayed poorly. It has a few replacement parts from different bikes (including indicators from a suzuki), a sterring damper that looks like it was soldered on by a one armed monkey, etc.
My theory is that it was running well when the starter motor packed it in and it sat idle then till I came along. I can not get the starter motor working still, but it starts first kick.
Im still working on the Carbs and they seem to be the main problem. The airfilters are a dual pod type that ive not seen on any other bike (look like the ones off a 1970's Torana) that do not fit properly. Ive had the carbs off once and fixed some minor problems (the trail of petrol it left behind on the road where ever it went). Im going to put a kit through the carbs, and even bought a kit off ebay however, I made an error and now have a carb kit for a 1982 CB 750.
The brakes will be the next project.
My aim is to get the bike registered for the first time in 20years. Im not sure what Ill do with it then. Really only took this on for the challenge. This is not the right bike for a concourse finnish. Im tempted to chop/bob it, though Ive not seen a frame design that really excites me. Id like soemthing with a fairly stock rake, a bit lower, a bit longer, and a hardtail. the Bobber frames on Cycle Xchange are pretty close, Id just like a little less rake.
Now that I have the old blinker unit working, I think Ill shine up the aluminium and make it some sort of feature.
Cheers
Tim
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