Surging idle . Video sample.

[NV Rider]

Surging idle on a 1981 KDX 250. Any ideas where to start? Leaky intake boot?



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[KDXGarage]

kind of sounds like it is out of fuel (i'll skip the Slingblade reference for now)

maybe air getting in

you are missing a vent hose

the caked up caulk on the boot does not look like a good sign for air integrity!

[linny]

To me it sounds like you have a clogged idle circuit passage

I would say you should bust that carb apart and clean the piss out of it with carb cleaner

+1 though for vacuum leak in the intake boot as well

I'd replace the gaskets anyways for poops and laugh

[NV Rider]

Thanks for the input!
I`ve cleaned the carb thoroughly so I`m pretty sure that`s not the issue. I`m leaning towards an air leak, through the intake boot more than likely. The boot is as far as I can tell the original from ``81 and is full of cracks. I`ve tried to fill the cracks as much as I can, but it seems I might have to bite the bullet and get a replacement part.

[KDXGarage]

Wrap it over and over with electrical tape and see if it changes. Beyond that, starter fluid spray will make er rev up!!

[NV Rider]

I`ll try the tape ;-)
Thanks!

[KDXGarage]

If you spray starter fluid on suspected areas, and if it has a leak, it will suck in the highly flammable fumes and she will run STRONG for just a second. Rev sound will change.

[NV Rider]

If you spray starter fluid on suspected areas, and if it has a leak, it will suck in the highly flammable fumes and she will run STRONG for just a second. Rev sound will change.

I took Katie (Yup, I named my bike Katie X) out for a ride today for the purpose of making some adjustments to the air screw. lo and behold , it made a significant difference! She runs much better. Not perfectly, but well enough for me to really enjoy riding!


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[KDXGarage]

Cool that you got it out for a ride.

[NV Rider]

Here`s the proof;-)