Maintenance & Technical > KX500 Original
Bike acting funny???
MinitubbedvegA:
Well I went out today to ride with some buddies, and as soon as I took the bike out it was acting funny. Only thing I did different today was that instead of letting the bike idle for a few mins on the stand, I got on it after 20 seconds or so, and putted around the offloading area, because I didn't have my stand. As soon as I came back around I noticed the bike was idling funny. It was real high, and when I would wack it open in 4th it would back fire through the exhaust once every so often. Maybe 8 back fires in 3 hours of riding. I messed with the carb, and it fixed the idle, but still had issues on top. I had just changed the oil, and cleaned the filter on it Saturday. After the oil change I only rode it down the street and back before putting it up, but it was running fine. I can't see it going from running fine to having problems over night, unless it is something small in the carb??
But it also idles a lil "weaker" now, before if you had your hand behind the silencer it would blow it back at idle, but not now. My reed spacers should be here tomorrow, so I will tear down the carb aswell, and see what I can find.
Thinking that it might be time for a topend here soon, I've had the bike for a month, and ride atleast 12 hours a week, and I ride hard, wondering how long you all get out of a topend??
I run 93 octane with Super M at 40:1, Notoil filter FMF Gnarly. Bike has never had any issue's.
Any Idears?
sniper1:
Check to see if some springs have broken on the pipe and check for oil coming out where the pipe pushes into the jug I seen a guy have similar problems with a leaky pipe due to springs coming off and no HTV sealant it's worth a look.
Another thing it may be is you might have sucked a reed or chipped one that will make it run like that too I had a rad valve and it was famous for sucking reeds at the dunes wide open no reed stops and it would break them off from time to time hope this helps.
Motorrad:
I had just changed the oil, and cleaned the filter on it Saturday
Polar-Bus:
--- Quote from: MinitubbedvegA on June 26, 2011, 02:39:27 PM ---Well I went out today to ride with some buddies, and as soon as I took the bike out it was acting funny. Only thing I did different today was that instead of letting the bike idle for a few mins on the stand, I got on it after 20 seconds or so, and putted around the offloading area, because I didn't have my stand. As soon as I came back around I noticed the bike was idling funny. It was real high, and when I would wack it open in 4th it would back fire through the exhaust once every so often. Maybe 8 back fires in 3 hours of riding. I messed with the carb, and it fixed the idle, but still had issues on top. I had just changed the oil, and cleaned the filter on it Saturday. After the oil change I only rode it down the street and back before putting it up, but it was running fine. I can't see it going from running fine to having problems over night, unless it is something small in the carb??
But it also idles a lil "weaker" now, before if you had your hand behind the silencer it would blow it back at idle, but not now. My reed spacers should be here tomorrow, so I will tear down the carb aswell, and see what I can find.
Thinking that it might be time for a topend here soon, I've had the bike for a month, and ride atleast 12 hours a week, and I ride hard, wondering how long you all get out of a topend??
I run 93 octane with Super M at 40:1, Notoil filter FMF Gnarly. Bike has never had any issue's.
Any Idears?
--- End quote ---
I'm thinking two things... are you running Ethanol fuel ? Is there old gas in the tank ? Ethanol causes MAJOR issues when left in your tank for months. Might be a spooge clogged carb. Second, is a worn out top end. Is your bike hard to start hot or cold ? Foul plugs easily ? These are all tell tale signs you have weak compression. I always recommend a simple compression test first.
MinitubbedvegA:
--- Quote from: sniper1 on June 26, 2011, 03:40:24 PM --- Check to see if some springs have broken on the pipe and check for oil coming out where the pipe pushes into the jug I seen a guy have similar problems with a leaky pipe due to springs coming off and no HTV sealant it's worth a look.
Another thing it may be is you might have sucked a reed or chipped one that will make it run like that too I had a rad valve and it was famous for sucking reeds at the dunes wide open no reed stops and it would break them off from time to time hope this helps.
--- End quote ---
The springs look good, I need to check how good the pipe is sealed to the head. The rreds are the first thing I thought of when it happened. Because it seems to run on a lil longer when the throttle is closed. I am going to pull the carb off and clean it, and check all that. Tracking numbers show my reed spacer should be here today!!! :mrgreen:
--- Quote from: Polar-Bus on June 26, 2011, 09:20:01 PM ---
I'm thinking two things... are you running Ethanol fuel ? Is there old gas in the tank ? Ethanol causes MAJOR issues when left in your tank for months. Might be a spooge clogged carb. Second, is a worn out top end. Is your bike hard to start hot or cold ? Foul plugs easily ? These are all tell tale signs you have weak compression. I always recommend a simple compression test first.
--- End quote ---
I am running crappy 10% ethanol fuel from the pump, but I have been for the last month as well with no issues, Definetly not any old fuel in it though.
The topend seems tight still, I am still running the same plug that was in the bike when I bought it, and the bike fires right up every time.
For what its worth I did notice the bike wasn't smoking while it was warming up as it usually does while idleing.I had filled the tank up on Sat., because we were supposed to ride, but didnt. I am sure that the 15 mile truck ride would've mixed the fuel back up enough though, right?
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