Maintenance & Technical > KX100 / KX85 / KX80 / KX65 / KX60

kx80 sputtering topend

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Johnniespeed:
Just another note, a two stroke will not rev up fully until the pipe is hot. I was hoping your problem was super simple like not allowing enough warm up time. It has been cold here in Michigan and the warm up time has increased for me, if I was new to two stokes, I might think something was wrong.

jabbahoo:

--- Quote from: John on November 05, 2006, 06:35:24 AM ---Hi,

Is this the first time the bike is causing you trouble? How long have you had it? Is the bike new? Has it worked fine before?

It would help to understand the problem if you could give a bit of history...

//John
Yes this is the first time the bike caused me trouble. I got it about 2 months ago and its a 87 kx80. It worked fine all exept the gas was leaking out the overflow tube, which I found out it was the needle and seat. I did adjust the flows and at that time the temps changed alot so I did'nt know if it was caused from the floats. I did put the floats back to where they were in the begining and per spec. but still same result. I understand how the jetting system works as far as what a pilot, needle and main do. but someone on another site said try and dropping the needle a couple clips to see. I'm just new to the 2 strokes and jetting. I ride a YFZ450 and do all the jetting myself. But this bike has me pounding my head on a wall. :?



--- End quote ---

jabbahoo:
Ok, I raised the needle a couple clips from the bottom and it helped out alot. So cooler temps leans out 2 strokes? It did'nt have the zip that it had in the higher temps but it cured the sputter.

KXcam22:
Jabba,
  The colder air is more dense, hence you get more actual oxygen taken into the engine with each stroke for the same amount of fuel. That makes it leaner. Altitude make it go the other way.  At higher elevations the air is thinner, making the bike richer. Hope this helps. Cam.

jabbahoo:
ok I must have been mistaken, The problem is still there. I went up and down on the last clip and no differance. I went to the cycle shop and picked up a 210m (it had a 200m) same thing still.  :?
Then I fouled the plug. Could it be to rich? 2 clip from bottom on needle and 200m? its all stock? I'm around 800 ft elevation bike is all stock. Does the 87 kx80's have a powervalve or do they have that kips? How can I check?

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