P212 idle

[Tpdingo]

I tried to get the P212 Hemi to idle a bit lower to help with some vibrations on my kart and I messed a bit too much and now it is idling very high for a second or two and then dies. What did I do and what is the default adjustment for the P212? I'm thinking maybe too far out and the governor is giving the motor gas?

---------- Post added at 07:51 PM ---------- Previous post was at 07:45 PM ----------

Update: I gave it gas and it seems that I keep turning the screw out and it is still way too high.

 

[mckutzy]

What exactly did you do to lower the idle... And it's going to vibrate.. It's inherently un balanced..

Recheck the throttle cable to the carb/throttle plate.. It might be pulling a bit...

 

[itsid]

just as mckutzy said!

FIRST check the throttle cable and pedal
(the pedal must have it's own return spring, otherwise it's pulling)

and vibrations are always an imbalance.. miniscule amounts (*cough*) are usual and nothing to worry about, but if it's nasty, it's likely the clutch weights being out of alignement.
(remove the clutch entirely and check again to verify)

if that's not the cause you might be too sensitive for said miniscule amount (*giggle*) ORRR worse: you have an internal issue with your engine (like a worn/shot crank bearing a wrongly installed or broken part or just a misaligned/falsely adjusted valve)

'sid

 

[Tpdingo]

Ok I fixed it. I think the screw cammed out on me, but I gave it some force from the throttle arm and it started to turn back again. All is good.

So the rattle was always varied. Sometimes when the motor first started up it would rattle pretty bad but about 10 seconds it would calm down. Most of the time it is a small shimmy, can't really feel it through the seat but you can see a small about of wobble in the steering at a standstill. And sometimes, I would fire it up and it would be whisper quiet.

Right now, I'm firing it up and it gives me the slight shaking but nothing huge. Probably just some inherent flaw with the clutch/motor. Motor is not broken, it has never been opened or serviced, just oil changes.

I think karts just vibrate a little and there is little you can do about it, and as itsid said, I think I'm just a bit too sensitive.

 

[mckutzy]

Check the mounting bolts and other drive-line assemblies that would induce vibrations.

I have noticed when I had run low on fuel and the motor still running but low revs... kinda like a Hit/miss engine... the firing of the cycle would make a hop of the engine as it "recoils". I guess as the fuel bowl is emptying faster than filling.. it does this.. But I keep a full tank as much as I can..

 

[itsid]

exactly..
if it's not "always" but just "occasionally" it's something you can (and likely should) fix.

I'd start as I said with the clutch,
since the first parts that wears out is the clutch
(sometimes the bushing if not lubed daily, sometimes the spring(s) sometimes the shoes)
it's easy to check and even easier to fix.
if that's okay a carb and air filter clean and replace the fuel filter
to make sure good clean fuel at constant rates is available.

And if it still rattles occasionally it's a resonating frequency in the chassis,
tighten all chassis bolts to specs, replace rubber grommets if you have any installed as vibration dampeners
and what's left of the vibration is likely normal

'sid