at a loss on air cooled 250r

[broncocarnage]

I have a 82 250r that runs away everytime it is started. I can't seem to Finda vacuum leak I have replaced the intake boot and intake gaskets but still doing it.when it taksoff I can pull the spark plug boot and it will keep running.the only way to kill it is plug off the intake or it run out of fuel.please help!!

[Xpress]

Is the slide inside the carb installed wrong? Make sure it can close all the way an open all the way when you put it in.

[hillbilly 200x]

Ok I dont want to sound like an idiot, but what kindy of gas do you have in it? I have seen lawn boy lawn mowers (2-strokes) do this and it turned out that some one had put diesel into there fule, it had all the same simpson as you are saying your 250r has???

[2fiftyR]

X2 on what express said.My 81 did the same thing when I started it for the first time.Look down the bore that the slide goes in, there should be a little tang opposite the idle adjust screw and make sure that it goes into the slot on the slider that runs the entire length of the slider.

[broncocarnage]

slide is in right im running premium grade gas with honda 2 stroke oil

[cr480r]

i've seen misadjusted throttle cables do this after a rebuild. Or sometimes the cable housing can slip out and get caught on the carb cap. Throttle should always have some free play. You should do a leak down test to check for airleaks. Are you using the correct spark plug?

[broncocarnage]

when this first started i rode it one weekend and it sat through the week in my garage and the next weekend i started it up and it took off. i have since tried all i can think of i have rebuilt the carb, replaced the reeds, reed cage gaskets, replaced the sprk plug, i just ordered new top end gasket kit to replace the jug and head gasket... i dont know what else to do.

[HONDA_ATC_FREAK]

Do a leak down test I was having a similar problem on my 83 250r I though it was a leak turned out my dad had turned the idle adjustment screw all the way in for the highest idle possible it sounded like it was gonna blow.
Heres a link to build your own leak down tester for about 20.00
http://www.3wheelerworld.com/showthread.php?96856-Make-a-leak-down-tester-for-about-20

[broncocarnage]

ok off to lowes i go.....