Maintenance & Technical > KX500 Original
Parade Lap K5
GDubb:
Mine runs good after a short warm-up in neutral without letting it idle much... then I ride it easy until I can tell that the engine is up to temp (first 15 min or so)so I dont cause it to cold-sieze... Otherwise it runs fine fairly cold, I just dont want to damage it. Also, I ALWAYS drain the bowl after EVERY ride and I always rev it out right before I shut it off with the thought that it will help clean the plug. I would think that you guys assume that you must ride it in gear to get it to run right when actually you are just causing it to warm up faster because it's under load. It should warm up fine in neutral... just takes more patience. :wink:
-G
Hillclimb#42:
Eww, don't know if i like that or not,Gdubb. I used to have a cold-foul issue with my 250. The quick fix was to run it out of gas after riding. ( actual cure was float adjustment)I knew it was out when it started to idle faster. Revving it up while gas is off is forcing a lean, hot condition. That may actually cause wear to rings and cylinder walls.
It seems that heat alone will not help the performance of the cold natured beast. It acts like once you get to that rpm, it is clean till that point. It will not completely rev until you ride it to that point.
Is it possible the extra load heats up parts to operating temps that otherwise won't get hot enough unless in gear? I think its a rich condition caused by evaporating fuel, with plenty of extra to be released by the float on every bump, or loading/ unloading. My fuel line is clear and dry at every start-up. Where did the gas go from float bowl and fuel line? Maybe the extra cc's in the k5 makes the condition more noticable than smaller bikes!?
BDI:
My bike does the same thing, always has. I never gave it much thought Its just what it does. I do know that if you are trying to set the pilot screw on a four stroke the motor has to be warmed up by riding it. If you warm it up by idle alone and set the fuel screw it will be wrong after you go ride it for a couple of miles.this happens no matter how long you let it sit and idle. Perhaps an engines bottom end never truly comes up to operating temp until you put it under load. On a two stroke this may have an impact on the way the motor runs do to the fact that the fuel goes through the bottom first. Maybe the fuel likes to gather and hang out in the cold bottom end of a two stroke and cause a loaded up rich condition. I bet the fuel even helps to keep the bottom end cold until it gets ridden and blown out.
TheGDog:
Any 2-stroke I've ever ridden never gets warmed-up properly until you go for a short easy-throttled warm-up ride that gets into at least 3rd gear.
And if you try to fight it... try to rush it getting warmed-up any faster... I've always noticed the engine just kinda like refuses to let you wring it out into the high revs until it is ready. Also, if you try too hard to warm it up you will cause damage. It's just a question of how much.
GDubb:
--- Quote from: Hillclimb#42 on June 30, 2008, 12:02:52 AM ---Eww, don't know if i like that or not,Gdubb. I used to have a cold-foul issue with my 250. The quick fix was to run it out of gas after riding. ( actual cure was float adjustment)I knew it was out when it started to idle faster. Revving it up while gas is off is forcing a lean, hot condition. That may actually cause wear to rings and cylinder walls.
--- End quote ---
Not what I meant... I rev the bike out so it sounds crisp and clear, then as the rpms come down I hit the kill switch. THEN I drain the bowl by turning off the gas and laying the bike over repeatedly until no more fuel comes out of the overflow. I NEVER run the bike out of fuel.
-G
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