that is affordable, has a large modern supply line and is easy to tune and care for.
After going through multiple different Mikuni/Keihin/Oko etc. options, decided on the Keihin PWK28.
For the unfamiliar, it is the modern version of the carb that came on the Kawasaki KR1.
Supply: One of the strong points of the carb. is that it is the current,
and has been for over a decade, carb. for the Kawasaki KX85/KX100 and Yamaha YZ85.
Modern supply, modern parts, easy accessibility and will be stocked till we're all fertilizer.
When calling to order 4 and asking if they had enough.....they laughed at that.
Cost: Because factory Kawi has boatloads of them, they can be had for an extremely affordable price.
You may notice some real Keihins (not OKOs) are listed on sites for $200-$300 each, like for the YZ85 etc.
But it was noticed that Kawasaki was selling the KX85 PWK28's for ~$86.
http://www.kawasakipartsnation.com/
I thought these were the cheap OKO knockoffs that many have had issues with, that are commonly about $80.
So I ordered 4 to see what was up and they just came in.
The $86 Kawasaki ones are real, made in Japan, factory Keihin PWK28's with the green factory
inspected markings, the nice castings, nice polished slides, good jetting
and even come with fresh Keihin vent tubes and clips....very nice.
Tuning data: Jetting specs and tuning results will be posted as the bike is set up.
Baseline will be what the KX85 comes stock with ie. 45/#3 NAPE/140 which should be close. (Keihin jetting is different than Mikuni's)
Based on what people run on the KR1(125)/KX100, it will prob be around 42/#2 NAPF/135 but we'll see.
A carb is going off to Bill Wilson so that he has accurate cable lengths for his throttle conversion for people in the future.
The carbs can either be run with pods, as they are not as sensitive to signal as the stockers,
or with FZR400 rubber airbox connectors on the ears-bells with pods or the stock airbox.
The intake boot side is the stock 35mm size on the PWK28.
Sudco has Keihin plunger cable kits if people want to retain the stock remote choke setup.
To get stock like throttle pull, they'll have FAST racing light springs in the slides. We'll see if they have to be cut.
I'm going to try to get the bike dialed with both the NAPE (KX85) and NAPF (leaner KX100) needles.
This way, high altitude/warmer peeps can order KX100 PWK's and low altitude/cooler peeps can get KX85 PWK's.
$86 either way and the jetting won't even need to be changed.
As the bike gets put together and dialed in a couple weeks, I'll post the tuning data.
