That`s interesting Jim, and far more detailed than any previous info I have seen on changes in the petcock. I had understood there were only two versions, the RES-ON-PRI from 1985 to `89 I think, and RES-ON-OFF from 1990 onward.
That was the only external change...
If you find the paper with the dates and particulars of the changes you outline here, I would be interested to hear from you that the dates given for the introduction of the 2nd and 3rd generation petcocks are as you remember them. Thanks.
Well, it wasn't a "paper", as such; it was what I wrote down cross-referencing between Kawasaki's web site, Ron Ayers, and another one I can't recall. That, and having 3 different actual petcocks in hand. And it all went down more than a year ago; hell, I have a hard time remembering where I put something the day before yesterday, sometimes.
My `91 has what I call the second version markings, RES-ON-OFF, (or the third generation from 1994 as you describe them), but I can`t comment on the pick-up tube filters or screens as I haven`t looked at them.
As far as I know, my bike was absolutely stock when I bought it 3 years ago, with about 12K miles on it. I suppose it is possible the petcock may have been replaced by a previous owner with a superseding one after 1994, but I don`t believe that to be the case. However I am curious about the apparent discrepancy between the dates in your info and the petcock on my bike, for the change from a Prime function to an OFF position.
Heh; you're not the only one that's confused.
Consider this: the only difference in the 1st and succeeding versions is the body casting, changing between the single oval filter and two tubes; the only difference between the first two and the last is the faceplate, changing from PRI-ON-RES to OFF-ON-RES.
First gen used the first casting, single oval filter, and first faceplate.
Second gen used the second casting, second filter setup, and the first faceplate.
Third gen used second casting, second filter setup, and second faceplate.
Taken all together, it works out that maybe there are only two petcocks, and somebody produced an excess of first gen faceplates, using them up between ~'89 and '93, before going to the second faceplate--or maybe Kaw just changed to the second faceplate to confuse the crap out of everybody. (Personally, I like that second theory, altho it's more likely some low level employee in the plant that stamped the faceplates didn't know what PRI meant, and changed it because he thought OFF made more sense.)
All use the same guts, and all work the same way; OFF still PRImes the float chambers when the engine is off, and PRIme shuts OFF fuel flow when the engine is started and the petcock is left in the PRI/OFF position, killing the engine when the float chambers run out of fuel. ON is still ON once the engine is running, and RES is still REServe.
What it boils down to, other than an interesting mental exercise, is it doesn't really matter. Any year petcock will work with any year tank on any year VN700/750, in any combination.
(BTW, I have all three petcocks; if I can remember next week after all the crap I've got to do over the next 5 days, I'll take a pic of all three and post it)