Rebuilding the carbs on my '82 GPz550 and have found 3 of the 4 diaphragms have taken a hard edged, set in the rubber that prevents the slide from moving easily back to idle position. What are you guys doing to replace? They're sure hard to find.
Thanks. Yep, TK26 CV carbs. Hate the way Kawasaki affixes the diaphragm to the needle, but it looks like it may be quite possible to change just the rubber with some modification...if the correct rubber could be found. Thanks for the link to JBM, I'll ping them. I'd prefer to just find a few in good nick, though
Just to update, JBM didn't have a pattern for the diaphragm and, because of it not being round and not trusting my measurements to allow the right fit, I looked to NRP in the UK. Once they arrive and I do the work to fit to the existing slides, I'll share results.
Wanted to update on the NRP diaphragm rubber. NRP was great to work with and the quality of the rubber and the fit was top notch. They aren't cheap at roughly $35 each, but what are the alternatives? You can't even buy new assemblies at the Kawasaki price of $170(!!) these days. Very easy to fit, too. Just pull the old ones out from between the plastic rings, apply some light lube to the new ones, slip into place. Working perfectly, now.
Also, I decided to run some pod filters for the time being (anticipate jetting changes down the road, because our weather really fluctuates seasonally) and shelve the stock airbox and associated plumbing. In case anyone is interested, the correct K&N part number for a 4 filter kit is RC-1824.