Tecate won't idle

[6spdls1z28]

Stock carb on my 86 only idles when cold with the choke. Has new intake boot, been cleaned. Runs good otherwise. Also sprayed the outside to see if it would die from an air leak nothing happens.

[fieldy]

So does it die or rev when it won't idle? It dies instead of idling I presume.

[6spdls1z28]

It doesn't die instantly with the choke off tries to idle but really low then dies. I turn the idle up it still does it but takes forever to idle down. And when I spray outside I hold the gas at a steady low idle and it doesn't change.

[fieldy]

I will quickly say that maybe you got dirt in the carburetor. A pilot jet is the idle circuit. You know this... Clean air and fuel supply. I have an rm that is acting that way and I kicked it and sucked a mouse nest in. I know I have to clean the carb, even the tiny holes you can hardly see looking in the venturi.
You have anymore details on the top end of the machine? Guys here are gonna wanna know.

[6spdls1z28]

All stock uni filter and dg pipe. Guess I can take it apart again. I do need to jet it . Bogs slightly on top end probably from the pipe.

[barnett468]

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try spraying flammable brake cleaner gently around with the long nozzle that comes with it.

try adjusting the fuel mix screw 1/3rd at a time.

take a compression test.

your elevation is pretty high so this could be contributing to the problem . . you loose around 4.5 to 5 lbs of compression for every 1000 foot increase in compression so if the stock compression on the tecate was 170 at sea level, you would have around 130 to 135 at 5000 feet which is around a 20% decrease which is huge . . if you have compression loss from worn rings, it will only add to the problem.

if you never ride it much below 5000 feet, i would consider having the cylinder head machined to try and increase the compression.

unike the honda atc250r, the tecates were designed as a high performance bike, and in general, high performance vehicles just don't like to idle .

[barnett468]

All stock uni filter and dg pipe. Guess I can take it apart again. I do need to jet it . Bogs slightly on top end probably from the pipe.

ok, the plot thickens.

take a photo of the spark plug and post it here.

try a 1 size smaller pilot jet.

you will likely need to change the main jet also.

.

[fieldy]

Really direct compressed air and maybe carefully run wire tool through all passages in the carburetor. Any history of when this began and the performance notes (like you posted above)will help with the diagnosis. Run an inline fuel filter too!

[barnett468]

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if the plug has a dry, black, coating, it is pig rich on the main jet at the very least and would warrant going down 2 sizes and testing that.

the compression greatly affects jetting, so if you change the compression by very much [more than around 10 psi], you will need to change the jetting if it was properly jetted before the compression increase.

[6spdls1z28]

The top end has been done back to stock has lots of compression. Also there is no fuel mix screw on the outside of this carb. Only idle.

[6spdls1z28]

I'm going to take it apart and pull plug will post pics.

[barnett468]

The top end has been done back to stock has lots of compression. Also there is no fuel mix screw on the outside of this carb. Only idle.

it does not have a lot of compression, or lets say nearly as much compression as it should have if the head is stock if you are at 5000 feet, it's simply impossible . . only a high quality gauge will tell you exactly what it is . . if the compression is low, that particular bike will NOT want to idle very well at 5000 feet . . i know this for a fact because i am the person that did ALL the development testing on it for Kawasaki motors.

.

[6spdls1z28]

Sometimes when i kick it on compression it won't go down so I'd say its got good compression.

[6spdls1z28]

Educate me on which jet is which one says 260 and the small one with the holes on the sides says 585

[6spdls1z28]

Never mind big is main small is pilot. I understand what you are saying about the elevation though. Im not to concerned about the idle just the top end bog. I misplaced my spark plug wrench this thing is a pain to pull out with a regular wrench with the pipe in the way on one side and the radiator hose on the other.