Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
raredesign:
RE: KX500 2002
I was getting close to good jetting but, I just repacked my stock exhaust and now it is WAY off.
I am in Rochester NY, elevation: 558 ft.
It kind of scared me, cause I noticed that it is making a bunch of noise. I don't mean the typical surge/backfire, but i mean something more from the head. It mainly happens when it too high of a gear and sounds like a backfire, but then again, when coming off a high rev, the surge/backfire is IMMENSE! I had the air at 2 turns out, so I put it to 1.5 and that really helped. I guess the new packing caused for major airflow.
I have been running the Spectro 32:1 mix at a 50:1 ratio. what do you guys think of that? There has been some comment that as long as you get good protection, you want to run a thinner ratio, because oil burns hotter than gas. If I use more oil, will that make it run hotter and give more surge or will it settle my jetting?
I just hear all these vids on youtube, and the kx500 sounds great. Then I start mine, and if I am not on the gas full throttle, it sounds like boiling water...completely unstable. Once I jump on the gas, the thing is a smooth rocket searching for peak.
Thanks guys. I don't know how busy you guys are, but if you could leave a response, call or email that is cool. If you are willing, I will PM my info. Thanks
KXcam22:
Rare,
It sound like you are getting close. Post some specific questions and I will answer. As for the oil thing, having more oil in your mix reduces the amount of fuel per unit of air, and so leans out your jetting slightly. Generally it is not enough that you will feel riding but only see with plug color. Cam.
Hillclimb#42:
I run 44:1 Super Tecniplate. I suggest any 2-stroke oil that is synthetic. Castor oils smell good, but foul too many plugs. I think the rule is the more revs you run them the less oil you need. 32:1 is good for new riders or tight trails, but i think between 40 and 50:1 is typical for a seasoned k5 rider. I absolutely stick with my mixture and adjust my carb for temps and conditions.
My k5 runs wierd on the low end, when it is running rich. It has alot of popping in the exhaust, especially in the bottom of 1st and 2nd. I leaned it out a half turn and it seemed to come off the bottom better. If your are turned out to far on the adjustment try dropping the clip adjustment. Also at idle, my k5 has an obvious different sound than what's coming from the exhaust. Its sorta like the rumble of a steamroller, before you see it. I think that is just the coffee can sized piston doing its thing in there.
Sometimes, when you swap pipes out, they recommend jets or silencers to go with it.
raredesign:
Ok, here are some questions:
INFO:
I am in Rochester NY, elevation: 558 ft.
I mix at 50:1 with jetting set at 175 main/ 62 pilot
I believe the stock was 168/58.
I have not messed with the needle clip position.
The reason I jet it this way was because I ice ride, but as it started to get warmer, i noticed it ran better than before. I was still getting some surging though.
After changing the baffle packing, I got MUCH MORE surging, and had to cut the air screw 1/2 turn just to make it more manageable.
QUESTION: What do I do? LOL...no seriously, what should be main and pilot be for this elevation and mix? Should I jump to a serious 200 main or something? or just adjust the needle clip?
Thanks
raredesign:
Ok, so i raced the clip (lower clip position) 5 rings: it was in the middle, moved to 2nd from bottom.
And....what was that supposed to do? lol
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