Author Topic: K7 750 Flasher behaviour  (Read 512 times)

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Offline Erny

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K7 750 Flasher behaviour
« on: August 18, 2018, 03:13:29 PM »
Just realised, that when I launch turn signal, it takes full pause period till first flash... I have flasher from 4into1 (https://4into1.com/reproduction-honda-rectangular-12v-turn-signal-flasher-relay-2-prong/)

Is this behaviour normal on bike with stock flasher?

Normally I would expect that it flash immidiately after swich is engaged to L/R, then pause. At leaste due te safety reason.
CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: K7 750 Flasher behaviour
« Reply #1 on: August 18, 2018, 03:22:26 PM »
One thing to consider is the state of the battery. I use my turn signal beeper as an indicator as to the state of the battery charge. These bikes are notorious for #$%*ty electrical chaging systems and if your system is draining when not on the road at higher rpms it may be trying to tell you something.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Erny

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Re: K7 750 Flasher behaviour
« Reply #2 on: August 18, 2018, 03:46:38 PM »
Battery is new (Yuasa) and charging system is in perfect condition, there is no problem.

Not sure I was clear in description, it flashes OK, but when I move swith to left or right, fist it pasuses and just then there is first flash (so it does Pause-Flash-Pause-Flash...). Means there is delay from the moment I want to flash till it really flash.
Normally it should be first immidiate flash Flash-Pause-Flash-Pause... like on any today's cars and motorbikes, it is much safer
CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline rotortiller

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Re: K7 750 Flasher behaviour
« Reply #3 on: August 18, 2018, 03:51:26 PM »
Old school flashers use a bi-metallic element to make/break the circuit. The electrical current that heats the element to the point of breaking the circuit runs through the signal bulbs.  It is possible to have a reverse coefficient flasher that heats the flasher element to activate or make the contacts to light the bulb but personally have never had one. It may simply have a more advanced  transistor like electronic switching than needs to be charged initially before making the connection. Different bulb wattage can change flash rates on old school flashers justas  line voltage variance may. It's enough that it works LOL.

Offline Bodi

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Re: K7 750 Flasher behaviour
« Reply #4 on: August 18, 2018, 04:02:41 PM »
It's probably a two terminal electronic flasher. That's just how they work. Three terminal electronic ones generally start ON like you want, or get an OEM mechanical one, or even a mechanical car type. These won't fit in the holder but is that a big deal?

Offline Erny

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Re: K7 750 Flasher behaviour
« Reply #5 on: August 18, 2018, 04:06:01 PM »
Thanks for explanation - this makes sense, I'll try 3-pin one, I should have some in garage.
I don't care about holder, as I don't have that piece of rubber there anyway.. (Lost by PO)
CB750K K7 USA model (1977)
CB550K1 USA model (1975)