The parts bike was a 1982 with cycom panel just like mine. I used the case
cover off of the newer engine as I wanted to keep it together as much as
possible. They wouldn't have made changes to the case cover within the same
year would they? Both cases have the exact same number stamped into them,
IN2345...And from the engine numbers, it appears that they were each made
about 1000 bikes apart.
Which relays will cut off the spark? And will they ONLY cut off the spark or
won't they also cut off power to the ignition. The bike will turn over .
When testing the coils, what I don't know is what readings I'm supposed to
get. My manual says to set it at 1K of resistance. Both of my meters only go
down to 2K.
James J Schneider wrote:
> "I put the newer
> motor on the old bike frame. ... All I had to do was put the
> rotor/stator from my old engine on it ."
>
> Barry,
>
> The coils don't care which side they are on, but the plug wire lengths are
> probably different, dictating their position, and you must make sure to get
> the low voltage wires hooked up to the correct coils, on the correct
> terminals. The coils from the different years should be interchangable.
> Yes, the safety relays will cut off your spark. And testing coils is
> pretty easy - test resistance between the two low voltage terminals, and
> also between one of them and the plug cap.
>
> Coils get power through one of the low voltage terminals, the one hooked up
> to the + side of the coil. They have a constant 12V when the engine is
> running. They are switched on the negative side; the ground connection is
> made and broken at the proper times by the TCI, which acts under guidance
> from the reluctor and pickup. The reluctor is a magnetic thing on the
> rotor; the pickup is mounted to the LH case cover and detects the reluctor
> going by, sending a signal to the TCI when it does. This is how the TCI
> knows where the crank is, angle-wise, so that it can properly time the
> spark. Which brings me to what I think your problem is. What year is the
> parts engine. what year is your bike, and what case cover and pickup did
> you use? You said you used the rotor and stator from the old engine. Did
> you also use the case cover and pickup from the old engine? If so, you did
> the right thing and your problem is elsewhere, but if not this could very
> well be your problem as Yamaha changed the pickup and reluctor design, more
> than once I think.
>
> Jeremy
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