Maintenance & Technical > KX500 Original
Need some advice on a running issue with my 1991 KX500 please..
Lon:
Ok,long story short..
I just got the bike about 3 weeks ago and the big guy was a mess,17 year old kid had it for a month and about run it into the ground..
Guy told me the bike needed the rear shock rebuilt and rear caliper rebuilt,well he was soo full of it..Picked the bike up around 9pm so was dark out,bike needed ALOT more than I was told when I looked it over the next day..
Missing spacers in the rear wheel,rear shock bracket wasn't even hooked up/bolted to the frame where it gos between the frame/engine case..He needed alot of love and getting it..First pic is when I first picked it up and 2nd pic is the first day I took it out,you can see a HUGE difference after I replaced and fixed the shock..
Anyways,you can see it was in pretty ruff shape when I got it..Knowing I needed to add all the missing parts,I bought a 1993 KX500 basket case that I planned to build so I had 2 KX500's and glad I bought it because it turned into my parts bike :-( ..Guy told me it has a brand new top end and the bike does,heres how I found out..Took it for a test ride down the street after replacing parts and once warmed up,I cracked it open full throttle in 3rd gear and felt like something was choking the engine..Parked it and looked everything over real good,arm that opens/closes the power valve was missing so I grabed one off the parts bike..Before putting it on,I tried pulling the rod to open the power valve...It was stuck and wouldn't even open 1/4 ways..Blocked off the piston so I didn't spray it and hit each side of the power valves with PB-Blaster thinking its gummed up with carbon..After working it in/out for 20ish mins,its fully opening..Put the arm on and hit the trails thinking everything its all good..Well has the same issue but seems a little better,I think..So im guessing the power valve is the reason im having wide open throttle issues correct?The bike was a mess when I got it so im guessing he had the power valve apart when the top end was done,could it be installed wrong?Never had a issue like this and never had to mess with a power valve..Just feels like it choking/fueling up if I try a wide open throttle run..
Thanks in adv guys :-) ..
Lon:
BTW,
Is it true that I can pull the cover off along with the black boot then start the bike..Throttle it a few times in neutral and see if the arm/power valve rod is moving??If so,how far should the rod come out?Im guessing it comes out all the way so the power valves fully open?
Foxx4Beaver:
--- Quote from: Lon on October 06, 2015, 01:33:34 PM ---BTW,
Is it true that I can pull the cover off along with the black boot then start the bike..Throttle it a few times in neutral and see if the arm/power valve rod is moving??
--- End quote ---
yes you can...
I know you probably don't want to hear it, but you're probably gonna have to pull the jug and inspect the KIPS...for wear, broken parts, heavy carbon build-up, or hopefully just mis-aligned valves.
Lon:
--- Quote from: Foxx4Beaver on October 06, 2015, 01:38:27 PM ---
--- Quote from: Lon on October 06, 2015, 01:33:34 PM ---BTW,
Is it true that I can pull the cover off along with the black boot then start the bike..Throttle it a few times in neutral and see if the arm/power valve rod is moving??
--- End quote ---
yes you can...
I know you probably don't want to hear it, but you're probably gonna have to pull the jug and inspect the KIPS...for wear, broken parts, heavy carbon build-up, or hopefully just mis-aligned valves.
--- End quote ---
Honestly,im glad to hear that lol..I kinda thought it was the power valve so already started thinking about buying a top end gasket set but wanted to ask and be sure first.. :-) ..I do have one other question..Is it ok to still ride it until my gaskets show up?Thanks man :-) ....
sandblaster:
That is tough to answer...
Could make things worse by riding it but probably not much.
Get a Cometic top end gasket kit or OEM.
If your valves were stuck chances are the top end has a lot of hours on it.
Inspect it carefully before you reassemble.
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