Maintenance & Technical > KX500 Original
Need some advice on a running issue with my 1991 KX500 please..
Foxx4Beaver:
yeah, replace the reeds a.s.a.p. if they were that bad....no sense playing with jetting if they are that gapped and worn.
how did you check that spark plug?...to do it correctly, you want to run it on a straight-away wide open for a couple seconds, providing you have a place that allows you to go that fast. Then pull in the clutch and hit the kill switch immediately whilst you're still coasting...then pull the plug and check it's color. This will tell you what you need to do...whether to go richer or leaner.
I would keep the riding to a minimum until the issue gets figured out....or it could turn very expensive very quickly.
Foxx4Beaver:
--- Quote from: Lon on October 08, 2015, 08:37:45 AM ---mixing it 32:1 ..
--- End quote ---
that's not bad...
a few of us are running 40:1
I've never used Klotz...just Bel-Ray and Motul
Lon:
Well Foxx,you were on the money bro..My dang crank seal is done :-( ..I didn't wanna believe it because the bike was running like a top but I could feel top end power was a dog..Thinking it was the reeds when I saw how bad they were so flipped them and waited until we went riding..Well we went yesterday and the first 45mins to a hour were good..Low end was ALOT better but top end was the same,got worse as the crank case oil/ATF was fouling the crap out of the plug to the point where it was breaking up pretty good..Just putted it around with my son but kept a eye on the oil level which did drop some..I always run the oil level a little below the top of the site hole..Kept a eye on it and by the end of the day,it dropped down to the middle of the site hole..
This wasn't a big deal until I found out I gotta split the d**n cases JUST to change the d**n seal which is pretty stupid..Turns a 1 1/2 to 2 hr job into a few day job over a stupid seal but its all good..Bike is new to me so now I get to go through and check everything while its apart ...
I already have YamaBond for the cases when I put them back together so ordering the Tusk oil seal kit so I can replace them all..
What a pain in the ass over one seal :-P ..
Foxx4Beaver:
--- Quote from: Lon on October 12, 2015, 08:00:43 AM ---Well Foxx,you were on the money bro..My dang crank seal is done
--- End quote ---
I know.
your jetting and plug color gave it away.
someone was trying to jet it as lean as they could to bypass the bad crank seal...whether the previous owner knew he had a bad seal or not, I don't know...probably not.
Either way...at this point, replace as many bearings and seals that your wallet/wife will allow you to spend, since you have to split the motor open anyways....definitely replace BOTH crank bearings and seals regardless!!...go over the tranny really good too.
Be sure you have a service manual for easy reference ...you can find them cheap all day long on e-bay...don't be afraid to ask questions...a lot of info is already in this site, you just have to use the "search" option.
Lon:
--- Quote from: Foxx4Beaver on October 12, 2015, 08:23:18 AM ---
--- Quote from: Lon on October 12, 2015, 08:00:43 AM ---Well Foxx,you were on the money bro..My dang crank seal is done
--- End quote ---
I know.
your jetting and plug color gave it away.
someone was trying to jet it as lean as they could to bypass the bad crank seal...whether the previous owner knew he had a bad seal or not, I don't know...probably not.
Either way...at this point, replace as many bearings and seals that your wallet/wife will allow you to spend, since you have to split the motor open anyways....definitely replace BOTH crank bearings and seals regardless!!...go over the tranny really good too.
Be sure you have a service manual for easy reference ...you can find them cheap all day long on e-bay...don't be afraid to ask questions...a lot of info is already in this site, you just have to use the "search" option.
--- End quote ---
To be honest man,the guy I got it from knew d**n good and well he f**ked me big time....Before we traded,he told me the bike only needed the rear shock rebuilt and rear caliper rebuilt..Also he wouldn't meet me during the day so I can see the bike really good,claimed he worked alot of hrs and all kinds or other BS storys..But being me and wanting my dream bike (sounds stupid but it is lol) for a good 20 years,I fell for his BS..But it is what it is and im doing what I can to get everything done right which I have so far..Main reason I bought a 1993 KX500 basket case,so I can fix this one..
When I split the cases,i'll check everything over for sure..Just really sucks people can't be upfront and honest anymore...Thanks man...
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