high idle & s little black smoke

[jasonleahey]

please help me .... last year i completed a jet upgrade .... ran great no problems ... this year i fired it up and is running like hammered dog SH!t... idles around 4000 for a few mins then comes down to 1500 then stalls also puffs very light black smoke at high rpms 6000 ish ......why the sudden change what happened and what can i do to fix it?

[KAT TOY]

sounds like jet cleaning time. maybe seafoam to start with fresh gas.

[jasonleahey]

ok update ... still running poorly only idles at 3000 and above but will start and no more black smoke

nut idle screw seems to do nothing not sure whats up

[arsenic]

Clean the pilot jets, check for vacuum leaks. Make sure the drain hose on the air box has a cap on it.

[kevin2502000]

Fresh fuel is a easy place to start.

[hardlydangerous]

I agree fresh fuel also make sure the vacuum slides are not sticking causing the rich mixture.
I would look into cleaning the carbs.

[jasonleahey]

cleaned the carbs today and nothing ... could the floats have anything to do with it .. of clip adjust of the factory pro needles?

[kevin2502000]

If the floats are set too low it was cause it to run rich, but if you have that jet kit you might have a different level other than OEM setting.

[jasonleahey]

At my whits end ... gettin ready to dump in the woods

checked that today ... opened the carbs for a 5th time took it completely apart and had it cleaned ( like sonic clean type thing ) so its sparkling ... then got a digital micrometer and checked the carb height its 14.5mm - 15mm ( factory pro recommends 14mm) but cant see how .5mm is gonna f it up like this (would bringing the level up closer to stock 13mm help this? )...the clips are set a 2 from the top and nothing

SIDE SYMPTOMS========================
starts but revs to 3000 or above

if i put it on prime to fill the bowls after carb clean it floods the engine (this will be the 2nd time i drain the oil) but i hope i fixed that with the cleaning and float check etc?

[scottynoface]

Your carb boots are not sealing.

[jasonleahey]

just to make sure i know whats goin on the carb boots are the big rubber things that hold the needle that you can access through the top? if so today i cranked the hell out of em ... dont know if that will fix it ? please advise

[kevin2502000]

Either your floats are sticking preventing them from shutting off fuel, your floats are way to low, or the needle seats aren't sealing.

[scottynoface]

The carb boots are the big rubber seals that seal the carbs to the airbox. Still betting that's your problem...or a too tight throttle cable...

[jasonleahey]

ok will check the boots tonight ..... floats seem to be working fine ( may be low? their at 14.5mm - 15mm factory pro recommends 14mm) and as far as the needles how do i check that their sealing?

[Kreylyn]

ok will check the boots tonight ..... floats seem to be working fine ( may be low? their at 14.5mm - 15mm factory pro recommends 14mm) and as far as the needles how do i check that their sealing?

Simple check on floats.

Fill the bowls and fuel line.

Clean the ends of the fuel line.

Blow on the fuel lines trying to push the fuel through.

If you can blow air through, the needles are not seated and there is an issue. Listen for bubbles, or look for gas flowing out.

Krey