todays idle & pressure

[zimmy]

warmed her up today....
now my idle is 750 and pressure of
48(idle) to 72....pretty cool
sounding...chug chug...but has a
little stutter and smells a little gassy...
timing or more carb ajustment?
yesterday my idle was 1200...what tha?
i also have a FULL tank of gas buti dont
have a cap but plastic sealed with a tight
rubber band...could this make alot of diference?

 

[jcatnite]

If you tank is vented through the charcoal filter it won't matter. If it isn't, you will eventually draw a vacuum on the tank and change the fuel delivery characteristics. As far as the gassy smell, probably running a bit rich. Make sure the ignition is up to snuff and then start adjusting on the carbs.
JC

 

[zimmy]

its not vented as there is no connection for the filter in my car that goes to the tank....dont ask me where it went, ive looked.......should i get a vented cap when i purchase one? how about a pinhole in my plastic till then?

 

[jcatnite]

You'll need someway to let air in the tank. A vented gas cap is a permanent fix. If you are just tinkering in the driveway, I would go ahead and pull the plastic off while letting the engine run and then put it back when you are finished. Travelling down the road is a different story. I think I would try and get the proper cap before I took it down any trips. Oh and btw, the engine will have to run a while before you start to draw a vacuum on the tank. You would be able to see the plastic getting "sucked in" before you would really be affecting the fuel pressure.
JC

 

[DrEntropy]

<soap box>
And as for the carb adjustment: the "raise the piston" method works well enough, but I really-really like the "ColorTune" tool Gunnison distributes. I know they're pricey but IMO worth it. I've two of 'em, that just makes the two-carb tweak a bit less aggrivatin'.

</soap box>

 

[jcatnite]

I like the colortune product too doc. Takes a lot of the guess work out of it.
JC

 

[DrEntropy]

I kinda like the idea of WATCHIN' the explosion, too... like lookin' into the firebox of an old steam locomotive! /ubbthreads/images/graemlins/grin.gif