Pickup Coil readings

[JDuc]

So I was having problems with my bike surging when I would hold it at a steady RPM range, and when I would get on it, I'd hit a brick wall, the tach would go to 0 and the bike would pretty much die. Because I would be going at a decent rate of speed, it seemed like it would kick start its self again.

I was racking my brain, trying to figure out what this could be. My husband and I would stay up late at night, laying in bed, throwing out possibilities to each other. Every time it came back to be something electrical due to the tack dropping to 0 and the bike pretty much dying.

So I decided that today, while at work, I would read my DesmoTimes manual some.

I got to the part about the electronics and the Pickup Coil.

Signs of a bad pickup are hiccuping at sustained rpm, or the bike dieing at high rpm.

BINGO!

So I came home and immediately pulled out the coil and unplugged it from the harness...splash....a BUNCH of water comes pouring out of the connections. Makes sense. I had to ride home in a HORRIBLE down pour on Friday and the bike has never run right sense.

Anywho, the Desmo Times manual states that this sensor should read 680 ohms +/-15% at 68 deg. F.

It reads somewhere around 930.

So, since the S4R has the same sensor, I figured I would pull it out and test it. 980.

wtf?

It's about 80 deg F out, but that shouldn't make THAT much of a difference?

Anywho, we dried out the connector, plugged it back in, and the bike rode fine for a few miles. The true test will be tomorrow on my way to work.

So why would there e such a discrepency here? 680 -> 930 is more than 15%....

Also, I have found quite a few discrepencies in this manual.

For instance, it states:

There are two different models of pickup coils used, one up through 2002 and the other on post-2002 desmodues. On the later design only one bolt secures the coil in place

My SS is a 2002 (manufactured 02/2002), and it has the single bolt design....and IIRC, my 01 Sport was the same way....but that was over a year ago that I had that one....strange.

[sperho]

Go to www.desmotimes.com and head to the message board and ask the man himself what's up (especially about the discrepancy). LT is a very helpful person...

EDIT: the link to his message board is http://ssnyder.proboards7.com/

[dharhay]

There have been other issues with the crank sensor. Some of the cable,s sheathing has been compromised and cause electrical noise. I mean portions missing or a cut in the sheath that exposes the wires. The sheath is under the black outer cover and isolates the cables from electrical noise. Also, a local shop stated that in a technicians class they suggested to reduce the air gap to .1-.2 mm.

Dave Harhay

[JDuc]

Originally Posted by sperho

Go to www.desmotimes.com and head to the message board and ask the man himself what's up (especially about the discrepancy). LT is a very helpful person...

EDIT: the link to his message board is http://ssnyder.proboards7.com/

thanks for the link!

I've also noticed that there is a discrepency when he talkes about which ECUs are in which bikes.

1.5 up to 2002, and 5.9 from 2002+

That's a little confusing....so since I'm a 2002, do I have a 1.5 or a 5.9?



I'll go to his board and post up!