another carb/fuel question

[Pilgrimg]

Hello all!
I have 99 valk stardard that I bought new and sorry
to say it does way more sitting then anything as indicated by
the  9000 mile on the clock.
I was hoping to rectify that this summe and when i tried to get it
started it cranked through the brand new battery trying to hit. After a
recharge I got it started barely. It hated life at this point and would barely idle
Let alone any throttle. So reading much on these boards  it pointed to the slow
jets. So following the jet replacement page here, my nephew and i took off the
tank and cracked open the bowls and put new stock slow jets in.
the slows on one side were blocked and partialy blocked on the other.
Now it starts and idles very well. But when i throttle up past the slow jets it boggs down like its running out of fuel.when we took off the carb bowls they the were mostly clean except a yellow film on the bottom. The floats were clean
and moved freely from under the carbs. Besides checking the fuel tank vent
line, would there be anything in the petcock that would cause this? Do the
screens get clogged? Could a pin hole cause this issue. Or should i look else
where. We were very single minded when we took the bowls off and forgot to
even look at the main jets. Can the main jet get clogged that badly also?
We will replace the plugs first and idle it with seafoam and see if that helps.
Any other ideas to start with?
thanks in advance  !! ,
Pilgrim

[Michvalk]

You can get the seafoam into the carbs a lot faster by opening the drains on the carbs. After the new fuel is in the carbs, then start it and let it run for a few min. Let it set for a few hours, and then let it run for a while (until warmed up good). The seafoam should disolve the varnish on the screen in the tank and elswhere in the system. Don't be afraid to use a whole can to a tankful. You will need to be patient trying to clean carbs this way, as it takes a while for the crap to disappear. The only sure way is to dissemble and clean MANUALLY. But, this method worked for me, and it might for you as well. Be sure and drain the old gas out and put new in

[Patrick]

So it sounds as if you just replaced the low jets without any further cleaning.. I think probably have more varnish within the circuits especially the low circuit.. Where are the pilots set ?? I'd suggest opening them 1/2 turn and running heavy doses of Sea-foam thru a couple tanks and see what happens.. If it straightens up then re-set the pilots to 2.25 turns.. If not,, roll up your sleeves again..

[Pilgrimg]

Thanks for the posts. Will check the vent first
and then dose with the seafoam. Btw, has anyone ever had the
actual metal vent nipple under the tank clog up? If so how did u clear
it? Blow some air pressue through there? I was asking cause
im not sure how the vent is actualy routed into the tank and i want
to determine for sure that its not a venting issue.

Thanks again,
Pilgrim 

[old2soon]

You want to speed up the cleaning process try some B-12 Chem Tool. Like most cleaners and additives make SURE you don't get it on the painted surfaces. Nudder wurdz-Be CAREFUL.  RIDE SAFE.

[mmurffy03]

if you have any extra fuel and vacuum line in your garage remove the vac and gas lines on the petcock and replace them with spares suck on the vac line to open the petcock and see how much and how fast the gas runs out of the fuel line into a can or some kind of bottle before you tear the tank off and waste a bunch of time guessing what parts might be bad or clogged

[Ricky-D]

To answer your question,

Yes, the main jets can get clogged up just as badly as the slow (idle) jets.

That's probably the reason you are still having the problems with throttle-up.

***

[salty1]

+1 on what Ricky-D says. Everything in the bowl should be taken apart and cleaned. The pilot passages should be cleaned and the pilots should be 1.75 turns out with 35 slow speed jets. You should also sync the carbs.

[Pilgrimg]

Thanks all for the replies. After we got it buttoned back up,
I started having this sinking feeling we "shoulda done somethin else too."
Well at least it was fun figuring out how it all goes together. Was a good
experience for both my nephew and I. After we exclude the tank valve and
vent, and try the seafoam, I guess its back to the carb bowl.

Thanks again,
Pilgrim