Maintenance & Technical > KX500 Original
suddenly too rich
matzilla:
yesterday after work i pulled the carb and cleaned it again. blew out the different circuits and all the vent lines. went back to original jetting and worked my way back through the pilot jets back down to a 55. it seems inconsistent. it will respond well for a couple trips up the street, then it sounds like it loads up the pilot circuit again. then i put my uni filter on and it did the same thing. i think i may have to pull my exhaust and look at things. i can see up the silencer, no packing obstructing. if i can't find anything wrong in the exhaust side i might have to pay my friend to fix it. i am getting frustrated.
Hillclimb#42:
Did you wind up looking at your reeds? When mine sucked a petal, it lost power. It idled, but fell on its face with a handful of throttle. But that was pretty consistent. No chance you are running old fuel? sounds like you ride too much for old fuel, but just rambling on about possibly overlooked issues. Did you try a new plug? I have had new ones that didn't work right.
cbxracer30:
What about a bad crank seal on the clutch side . It's now rich , it's oil foul . Everytime our 5's go extremely rich it's the crank seal clutch side - extremely lean suddenly crank seal flywheel side. CBX
matzilla:
oh i hope that isn't it. what a pain. just put it together in november. oem seals.
Friar-Tuck:
Matt,
Like CBX mentioned, without any other changes to the bike the crank seal would be a likely suspect. The ones I had go bad did so in pretty short order. Like one ride the bike was running like a scalded Dawg and the next time I took the bike out I fouled a plug trying to start her up. No rhyme or reason, just Ka-Poot.
You also had a question on the Vent lines in the air box.
The pulses in the airbox of a single or twin can be a pretty big boom to something as sensitive as carburation.
Every time the piston moves up and down their are some pretty big gulps of air rushing in to the engine and then getting stopped in it's tracks as the ports and reeds open and close. Those pulse waves also can affect the fuel in your carb.
Just like manipulating a liquid in a glass with a straw the same thing is going on in the carb bowl if the vent lines are terminated in your air box. I had run mine in the airbox also and didn't notice any changes except less dust in the vent lines.
Some more experienced riders Claimed it messed with their jetting. I now run my vent lines up along the backbone of the frame and the fuel tank. no problems...yet...
Tuck\o/
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version