Maintenance & Technical > KX500 Original

3/4 to full throttle problems

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jolly green thumper:
At 3/4 to full throttle in all gears engine is running poorly. I have cleaned carb, air filter, new 94 octane gas with octane boost (+2) with Klotz oil at 40 : 1 and new plug. Problem has not cleared. Engine is not bogging but sputters. I think it's running leaner at higher revs. Dealer I purchased the bike from told me it needed to be run at higher speeds to blow it out. I have ran it at full throttle in 5th gear but problem has not cleared  Is this still a carb problem or something more involved ? Any main and pilot jet sizing or needle jet adjustment suggestions ? Also have to kick the hell out of it to get it started. Usually 20 kicks to get it going. Right foot is getting a little sore. Any tricks to starting the beast a little quicker . From idle to 3/4 it runs great no problems at all.

Mike

Arigato:
Run it full throttle again and hit the kill switch while wfo.  Pull the spark plug and tell us what it looks like.

gowen:
It's running super rich. Things to take a quick glance at: Powervalve opening?  What is your needle position/Needle #, Mainjet #, Also how many turns is your air screw in?, and make sure your choke isn't on. lol

When doing a sparkplug test, make sure the sparkplug is new. Because if you have been running it rich for sometime it will be black.

Get back with the mainjet # (stamped on the side of the carb). Also, just for kicks, try raising the needle clip (dropping the needle) and see if that is of any help.

hughes:
How is idle to 3/4 throttle?? Carb flooding out one of the vent lines??

doordie:
Put in a large mainjet until it?s "fourstroke" and then lean it down from there. :wink:
(A stock K5 have 165 mainjet, put in a 180 and go down from there).
55-60 pilotjet with stock reedcage.

Clean filter in gastap to,blow it,dont suck :-D.


If problem don?t solves,check inside exhaust port that KIPS moving and don?t "hanging down" or stuck.

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