Engine Not Getting Fuel After VM Rebuild

[Big T]

Those needles don't "flatten" they break. The little piece that breaks off blocks the air flow and the carbs don't work. You need to clear the tiny holes behind those screws.

As for the "flat" screw. You may be able to sharpen them... Otherwise they will need to be replaced.

I believe they block off the fuel flow, not the air

[slaveforthewave]

since the bike ran before i disassembled the carbs is it possible when i pulled the screws out they broke? the bike was jetted with an 4-1 exhaust before i got it. points were shot so i switched to electronic and the bike fired right up no problem and idled fine. now the bike will only run if i'm blowing into the funnel lightly...

i've got no problem pulling the carbs again and trying to locate some missing screw tips, but if it sounds like a tuning problem i'd rather go that route.

thanks for all the responses btw, it's much appreciated.

[Big T]

Check my post above about your screw settings

BTW, did you use some kind of rebuild kit?

[slaveforthewave]

i put the screws exactly where you said and it's still acting the same. pressure in the fuel line makes her run, but idle is extremely high and popping out of the carbs is still there.

i used the Z1 rebuild kit here http://www.z1enterprises.com/detail.aspx?ID=502 just kept and cleaned both jets that were used after PO jetted bike.

[rustybronco]

I know the pilot fuel screws were bottomed out so hard before I got this bike that they were flattened on the tips, but I cannot find replacements anywhere. Could this have to do with my problem?!

Thanks.

At what point did adjust the pilot (fuel mixture) screws to get the bike to run correctly before you started doing the carb rebuild?

okay, so the needles that are flattened are on the bottom side of the carbs on the side closest to the motor. the vm rebuild pdf on the basscliff site calls them the pilot fuel screws. i took everything apart, dipped the carbs, pumped compressed air into every nook and cranny, bought the rebuild kit, and put everything together the way i found it.

kind of a bummer that the thing ran just fine before but the carbs leaked gas like crazy, so i rebuilt them and now nothing but problems!

Considering the excess amount of fuel being supplied to the carbs, you probably didn't need the fuel from the pilot screws to get it to run. AND with damaged pilot screws and the carbs overflowing there's no way it ran correctly. ran yes but not correctly.

remove one of the damaged pilot screws and take a GOOD picture of it- then post it up.

[slaveforthewave]

i never had to adjust anything on the carbs when i got the bike. slides were siezed but after some carb cleaner they moved again and the bike fired right up but the bowls leaked pretty bad so i decided a rebuild was the next step.

i have a picture of a fuel screw and the bottom of the carb. looks like a little gold dowt in the middle of each passage.

http://i51.tinypic.com/vdd5rl.png

http://i55.tinypic.com/2cmxcw0.png

[Adler]

i never had to adjust anything on the carbs when i got the bike. slides were siezed but after some carb cleaner they moved again and the bike fired right up but the bowls leaked pretty bad so i decided a rebuild was the next step.

i have a picture of a fuel screw and the bottom of the carb. looks like a little gold dowt in the middle of each passage.

http://i51.tinypic.com/vdd5rl.png

http://i55.tinypic.com/2cmxcw0.png

That little dot... is bad. Its supposed to be a clear, tiny hole right into the air tunnel.

Here is my old thread from when this happened to me...

http://www.thegsresources.com/_forum/showthread.php?t=165403

[slaveforthewave]

i actually read that 5 minutes before you posted. haha. if it's not one thing it's another i'll tell you what!

here goes nothing. i just sharpened my screws, hopefully i can manage to trick these things into coming out and into having a running bike once more!

thanks all for the help.

[portdave]

i actually read that 5 minutes before you posted. haha. if it's not one thing it's another i'll tell you what!

here goes nothing. i just sharpened my screws, hopefully i can manage to trick these things into coming out and into having a running bike once more!

thanks all for the help.

I am about 45 minutes away from you and may be able to help if you can't get it sorted out. I have some extra carb bodies. That one you had a pic of was broken off pretty bad.

Just keep at it...

[slaveforthewave]

thanks dave, i'll keep that in mind definitely! turns out all four tips were broken off in there. sharpened an old screwdriver and a few minutes of tapping later and they were all home free. put the newly sharpened fuel screws back in their homes carefully and maybe tomorrow i will have an idle again!

[portdave]

thanks dave, i'll keep that in mind definitely! turns out all four tips were broken off in there. sharpened an old screwdriver and a few minutes of tapping later and they were all home free. put the newly sharpened fuel screws back in their homes carefully and maybe tomorrow i will have an idle again!

Just set those screws like mentioned above (lightly seated) and you should be in business. Best of luck.

[Big T]

Your problem might also come from your bowl gaskets blocking a passage

Isn't the one at top right in your picture supposed to have a hole (where the knock out is)?

Edit - there's a tube that runs down there and it's at lower left, so that should be open

[slaveforthewave]

same thing, bike won't start at all. has spark, if i pressurize the funnel the bike will run while there is pressure in there but when i let up the bike dies. weird thing is, when i blow into the funnel gas comes from one port on one carb and none of the others. i circled it in the attached picture. what is that about?!

[Big T]

same thing, bike won't start at all. has spark, if i pressurize the funnel the bike will run while there is pressure in there but when i let up the bike dies. weird thing is, when i blow into the funnel gas comes from one port on one carb and none of the others. i circled it in the attached picture. what is that about?!

Well, I'm sure by now that you've discovered that the passage leads to your main jet. So, you're flooding the carb, like an Amal "tickler"

Once you've pulled out the broken tips and cleared the enrichener "choke" circuit, I think you'll find your idle. The enrichener is that copper tube sticking down into the float bowl

[KEITH KRAUSE]

I believe they block off the fuel flow, not the air

Just so everyone knows, the pilot fuel screws assist the pilot jet. They regulate the mixture of air and fuel passing around them. Their purpose is to fine tune the pilot circuit mixture for each cylinder.