Maintenance & Technical > KX500 Original
Help With Revving High
blueoval:
Thank you all so much for the help. Really appreciate all the input and advice!
Friar-Tuck:
Now that you've verified the Kips is in fact moving smoothly.
Is there an excessive amount of play in the main Exhaust Valve ?
(flapper pg.147 picture 92;) don't take it out unless you want to clean it.
The mounting pins get worn and carbon bound.
With the operating rod at rest wiggle the ex. Valve. (flapper) up, there should not be much play there.
Have a peek at what the drums (Pg. 145 #'s 19 & 24 ) look like, up in the exhaust on the left and right hand side of the exhaust itself.
Move the rod again and look at the drums rotate, as the rod moves out away from the cyl. the drums rotate and each open a port , while the main exhaust (flapper) drops open.
When the rod is all the way out, each drum exposes a port,and the Flapper should drop down to the floor of the exhaust flange.
The kips bolt mod now comes into play.
with the exhaust rod at rest, do the flats completely close off their respective port or do they "overrotate" and expose the edge of the port they are supposed to be cutting off.
Now go around to the hex head bolt at the opposite end of the exhaust rod on the outside of the cylinder on the "Flywheel side" of the engine.
Break loose the Kips bolt (pg.146 fig. 83) as you remove the bolt, go back and look up in the exhaust at the drums. They will be rotating as you pull the bolt out.
The bolt mod will close off the port and you can pick up some bottom and mid.
When you see it takes longer to explain this than to replace the bolt you will be sure to chuckle... It's late I'm tired and if I mucked this up I'll either fix it later or just wipe it out...
Tuck\o/
cbxracer30:
Before you get too crazy and tear a bunch of stuff apart check the screen on your fuel shutoff , if it is dirty when your bike wot its draining the carb and the flow may not be keeping up, then once you back off the throttle it revs til the bowl fills back up. Just a thought of maybe a simple fix. CBX
blueoval:
Thanks CBX. I didn't think of that. The fuel shut off is new with only 2 rides on it, but I will take a look at that later today. Guess it wouldn't matter if it was new if there is "crap" in the tank. I just love this site. Such a large pool of knowledge and experience to draw from. thx
blueoval:
NO high revving at all today after WOT. Still had 2 or 3 surges when off the throttle, but the high revving was never present.
Went to a 62 on the pilot. Loaded up a little in the tight riding, but cleaned out pretty easily, not as crisp down low, but elevation was up to 6,000 ft. Still lost some low end from previous settings at all elevations.
Went to 170 on the main. At about 1000 ft and 45 degrees it went like a raped ape up top.
Same 3rd clip on the needle. Float level as above. 32:1.
So, excellent top end, lost some low and mid.
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