Maintenance & Technical > KX500 Original
1988 & older VS. 1989 - 2004 : Engine Performance | Output Shaft Nut | Swingarm
manco:
Keep bumping into this Dirt Bike KX500 article when looking into big bores recently. Finally took the time to read it through. The article brings up the engine changes in the early nineties. It also mentions the ignition change that year. I have found other mentions on the net of these changes but not really any specifics. Does anyone have info on the ignition curves & crank specs before and after the change over?
THE LIFE & TIMES OF THE KAWASAKI KX500
"1992, the ignition and crank were changed as an unofficial acknowledgment that the KX was being used more for off-road riding than motocross."
http://dirtbikemagazine.com/industry-news/the-life-times-of-the-kawasaki-kx500
manco:
Totall Bollocks. The yamaha stem nut arrived & fits well. Too bad it turns out to be aluminum though. The nut will work for test riding around the block but will need to be upgraded to steel for regular use. I am gonna try to find a cr80 nut next.
manco:
I just looked into a cr80 nut. There is no nut on the output shaft of any year CR80 that I can see. All of them use a plate with two nuts to attach the sprocket to the output shaft as shown in the below picture. If any one can offer any other info on this nut whether CR80 or otherwise let me know. Thanks.
manco:
Here is some more info on the output nut.
I was concerned that replacing what I beleive is a steel nut with an aluminum nut would not allow the aluminum output nut to be tightened enough as aluminum is softer then steel. I did some digging though and found that my concern is probably unwarranted. The torque specs for the output shaft nut in question are 58 ft-lbs. The torque specs on the aluminum yz250 nut are 105 ft-lbs. So the nut should tighten up properly to 58 ft-lbs without issue. I am no machinist so don't take my word on all this though. I guess I will use the aluminum nut tightened to spec and see how it goes. Below is a pic of torqure specs for the KX500 output shaft & YZ250 stem nut.
Here is some more info on this rare output shaft nut:
The nut was used on 74-79 kx250, 79-80 kdx400, 81 kdx420, 82 kdx450, 83-87 kx500 as well as a few other older kawaski models.
If you look on ebay right now there are three of these used nuts for sale ranging from $10 w/ s/h for a crappy one up to $40 w/ s/h for a nice one.
I have found that recently Triumph has used M24x1.0 nuts on there new America & Speedmaster bikes. It is part number t3350680. It sells for $4 new. I do not know what the nut is made out of. I am guessing it is either steel or aluminum. I am gonna stop by the local Triumph dealer and check one out sometime. Here is the nut on line http://www.2wheelpros.com/oem-parts/triumph-nut-flgd-m24x1-0-t3350680-part.html
Here is the torque specs on the kx output shaft & yamaha stem nuts.
Actionman:
These are great threads! These detective-style threads are always fun to see what can be repurposed when the "proper" part is unavailable.
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