Maintenance & Technical > KX500 Original
bike just doesnt seem right.
kelcrist:
well i have found the problem.................. i have an FMF spark arrestor installed. i was doing some swapping around while servicing the suspension and found a loud rattle when i was moving the sub frame around. turns out the pipe down the middle was broken off so the tail of the silencer was filling with exhaust and not moving out. thats where the oil and goop was coming from. i put on the stock silencer and its much better. sounds crisp again and missing like before. i havent had the silencer off in quite some time so no idea how long i was trying to tune around this issue. so anyway just goes to show ya...............start with the simple stuff.
kaw rider:
--- Quote from: Polar-Bus on April 29, 2011, 04:00:42 AM ---
--- Quote from: Motorrad on April 20, 2011, 05:42:06 AM ---
--- Quote from: kelcrist on April 19, 2011, 04:04:13 PM ---it is not out of the question!!! if it were a honda id just change them and not give it a thought....
--- End quote ---
Ive always wanted to find another set of cases, to "work on" ...
as Id like to be able to change the seals from the outside...
I think its doable... with alot of work
--- End quote ---
I did the lower end in my '97 KX250, and if I remember correctly there is a series of casting lips around the OD of the crankcase seal bores that only allow the seals to be installed from the inside of the case. You could bore those nubs off and be able to install seals from the outside, but then my only concern thereafter would be the imfamous KX500 kickstarting "backfire" blowing the seals clean out of the bore(s) ! :-o
--- End quote ---
A set of locking plates would fix that problem.
Goat:
--- Quote from: kelcrist on April 29, 2011, 02:33:18 PM ---well i have found the problem.................. i have an FMF spark arrestor installed. i was doing some swapping around while servicing the suspension and found a loud rattle when i was moving the sub frame around. turns out the pipe down the middle was broken off so the tail of the silencer was filling with exhaust and not moving out. thats where the oil and goop was coming from. i put on the stock silencer and its much better. sounds crisp again and missing like before. i havent had the silencer off in quite some time so no idea how long i was trying to tune around this issue. so anyway just goes to show ya...............start with the simple stuff.
--- End quote ---
Glad you found the culprit. So the pipe inside the silencer was broke and causing a blockage?
Polar-Bus:
--- Quote from: kelcrist on April 29, 2011, 02:33:18 PM ---well i have found the problem.................. i have an FMF spark arrestor installed. i was doing some swapping around while servicing the suspension and found a loud rattle when i was moving the sub frame around. turns out the pipe down the middle was broken off so the tail of the silencer was filling with exhaust and not moving out. thats where the oil and goop was coming from. i put on the stock silencer and its much better. sounds crisp again and missing like before. i havent had the silencer off in quite some time so no idea how long i was trying to tune around this issue. so anyway just goes to show ya...............start with the simple stuff.
--- End quote ---
Awesome ! Ususally most people that come here asking why their bike runs like crap stems from a junk top end. Glad to read that you have a simpler to fix issue. Reminds me back in the 80's when I was racing MX , i left a paper towel in the carb to keep dirt out, and in a frenzy slapped the air filter back in without removing the towel ! The bike ran like $hit ! I was dead last in that moto took me an hour to figure out what a dumba$$ mistake I made ! :?
kelcrist:
well the broken tube inside the muffler wasnt necessarily causing a blockage.............it just wasnt allowing the exhaust to flow directly out of the silencer. all the packing was blown out so the rear compartment was filling up before pushing the rest of the exhaust out.
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