Maintenance & Technical > KX500 Original

92 kx500 problem

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shixanget:
Hello all. Just picked up a nice 92 kx500 a week ago. So far was running great and man is this thing a beast. Was riding yesterday and was running the same as usual got done and parked it. Next day tried to start and well it's not wanting to start. Got it to start two times and the has great compression as well. Air filter is clean. first time I took it off choke and it died. Second time left it on choke tried giving it some throttle and it's like I never twisted the throttle. No response until I fully opend it and it bogged down. Throttle is hooked up correctly and opening the carb still. One issue I just found is there is about a 1" crack on the expansion chamber. Could that cause this?? Thanks!

Foxx4Beaver:
Welcome to the site shixanget...

Start by pulling the carb off, and give it a GOOD cleaning, pull all the jets out and blow compressed air through all of them, and write down all the current jet sizes for reference.
While you have the carb off, pull the reeds out too and check for broken petals, and/or gaps around the edges...the reeds should be sitting flat all around the reed block. If there are gaps, you can try to flip the petals over...but if that doesn't get them to sit flat, you may need to get a new set of petals.
Toss in a new spark plug if you have one...gapped at .024, and verify it for spark....put it all back together, throw some fresh fuel in it...and see if it'll fire up and run like it should.
It would be a good idea to get that crack in the pipe welded soon, or it could get bigger....or buy a new or used pipe....but if it's just a hair line crack, that shouldn't cause it not to start.

Let us know how you make out....if it's not better, a compression test, and a leak down test may be in order...but it sounds fuel related.

sandblaster:

--- Quote from: Foxx4Beaver on January 20, 2016, 09:47:06 PM ---Let us know how you make out....if it's not better, a compression test, and a leak down test may be in order...but it sounds fuel related.

--- End quote ---

+1

And welcome to the site  8-)

reklessj:
My T4 did the exact same thing pulled the carb and the needle had broke and was just sitting in passage as the slide operated normally. Just a thought.

shixanget:
Got around to pulling everything off today. Carb looks excellent. Clean as far as I can tell. (New to the 2stroke game) but I believe a carb is a carb right? How many jets are there? From what I can tell I saw one flat head jet in the carb and one flat head on the side. Which I was assuming is the air/fuel didn't mess with it. Reeds looked good. Both laid flat to the surface. Compression test around 155. And might I mention it's been around 20 degrees here for the last few weeks. Good ol Kansas. Tried to start but eventually gave up after 4-5 kicks. I'm not sure how temperamental 2 strokes are in the cold so. Now I'm stumped.

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