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Posted by Puddin' Man on August 28, 2008, 1:23 pm
'87 CBR600, 20k mi. Had to replace the pulse generator in the 90's. No
electrical problems in many years since.
Failed to start yesterday. Starter motor functions fine. No combustion
(pop, splutter, etc) whatsoever. Fails spark test.
All fuses are OK. Got too hot in the garage to proceed.
The spark units on these things go bad? Anybody know how to test?
Other possibilities?
Thx,
Puddin'
"I Ain't Blind, I Just Don't Wanna See"
- the title of a tune by Little Joe Blue, maybe 1966
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Posted by . on August 28, 2008, 3:51 pm
> All fuses are OK.
How about the 30-amp fuse hidden on top of the starter solenoid?
>
> The spark units on these things go bad? Anybody know how to test?
Check for 12 volts at the ignition coil, and 12 volts to the ignition
control unit and a good chassis ground.
If you are getting 12 volts from the ignition coils to the controller,
you should get ONE spark on the 1 and 4 or 2 and 3 spark plugs every
time you turn the ignition switch on and off.
Transistor ignition units basically replaced the older ignition points
with a transistor, and every time the transistor gets a pulse from the
pulser coil, it switches off momentarily.
You can test the coils themselves by applying 12 volts to the plus
side and using a wire from the minus side to chassis ground to
simulate a set of ignition points
It's possible to simulate the pulse by applying 1.5 volts from a
flashlight battery to the pulser inputs on the control unit, but if
you get the polarity wrong, you can blow out a transistor. :-(
Your local Honda $tealer$hip probably has an ignition unit tester.
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Posted by Rob Kleinschmidt on August 28, 2008, 6:00 pm
> '87 CBR600, 20k mi. Had to replace the pulse generator in the 90's. No
> electrical problems in many years since.
>
> Failed to start yesterday. Starter motor functions fine. No combustion
> (pop, splutter, etc) whatsoever. Fails spark test.
>
> All fuses are OK. Got too hot in the garage to proceed.
>
> The spark units on these things go bad? Anybody know how to test?
>
> Other possibilities?
With an electronic tach, this is pretty easy.
If it's a problem in the trigger circuit, my tach stays flat while
cranking but shows a blip when I turn the key off and the trigger
circuit is grounded.
If it's a problem in the coil rather than the trigger, the electronic
tach will
show some small RPMs while it cranks, indicating that it's triggering.
If you don't have an onboard tach, an engine analyzer also shows
RPMs when hooked to ignition coil negative. RPMs indicate
that the trigger unit is making and breaking a ground.
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Posted by Puddin' Man on August 29, 2008, 12:49 pm
On Thu, 28 Aug 2008 15:00:09 -0700 (PDT), Rob Kleinschmidt
wrote:
>With an electronic tach, this is pretty easy.
>
>If it's a problem in the trigger circuit, my tach stays flat while
>cranking but shows a blip when I turn the key off and the trigger
>circuit is grounded.
>
>If it's a problem in the coil rather than the trigger, the electronic
>tach will
>show some small RPMs while it cranks, indicating that it's triggering.
>
>If you don't have an onboard tach, an engine analyzer also shows
>RPMs when hooked to ignition coil negative. RPMs indicate
>that the trigger unit is making and breaking a ground.
What I got is the original tach for '87 CBR600. I don't see
a cable, so I assume it is electronic. The needle does
nothing whatsoever when I test per above.
Is the result above from a '87 CBR600? Some later year?
Note: I am at best a novice mechanic. I've got a $10 analog and
a $10 ($30 not-on-sale) dig. multimeter. Understand the bare-
bones-basics of resistance, but don't know how to interpret
some of the ohmmage readings I get on these flogging things.
Further tests:
Spark test fails on #1 (on coil 1) and #2 (on coil 2) cyl. plugs.
Battery was somewhat run down from testing, but measured 12v at source
and 10.6v to spark unit 6-pin connector. Battery is now on
trickler.
There are 2 tests for the 4-pin connector at the spark unit (pulse
generator circuit):
Ohms (each leg) - One leg consistent at ~ 1 ohm. Other leg erratic:
all over the dial. Both should be ~ 500 ohms.
Ground fault (each leg) - Tested OK, no fault.
I think I smell another damnable pulse-generator failure, but I'm
not sure.
Would love a definitive test. Fear I'm out of my element.
Thx,
Puddin'
"I Ain't Blind, I Just Don't Wanna See"
- the title of a tune by Little Joe Blue, maybe 1966
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