| Author |
Message |
    
Shotgun
| | Posted on Sunday, July 17, 2011 - 03:51 pm: | 
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97 ST3, bike little used last 3 years by previous owner. Cleaned carb, new gaskets, new accelerator pump diaphram, removed and cleaned all jets. Did not remove or adjust float, as can't remember how to remove the float pivot pin. I seem to recall breaking the part that holds the pin once upon a time and having to get a replacement carb. Also, the sealed idle air jet has been unsealed, jet cleaned and several settings tried without change in above. Any help appreciated. |
Ocbueller
| | Posted on Sunday, July 17, 2011 - 07:04 pm: |
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Did you replace the intake manifold gaskets?
SteveH |
Bluzm2
| | Posted on Monday, July 18, 2011 - 08:59 am: |
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If it run on choke but not with it pushed in, your low speed circuit is clogged.
Did you clean both jets? The low speed has tiny holes, if you didn't get them totally clean, that's your problem. The low speed jet is down in the hole a ways.
How much gunk was there in the float bowl? |
Shotgun
| | Posted on Monday, July 18, 2011 - 10:26 am: |
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I did pull out the slow speed jet and it was clogged, cleaned it with carb cleaner. The high speed jet and it's perferated tube seemed clear, but I will check the perferations again. I agree, it must be the slow speed circuit. The float bowl was pretty clean, a few tiny particles. The gas line from the carb had about a half teaspoon of "spooge" in it. Sorta like mustard. Replaced the line. I flushed the tank of all old gas before starting it. |
Shotgun
| | Posted on Monday, July 18, 2011 - 07:02 pm: |
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Ok, carb off 3 more times. Replaced intake manifold seals, blew everything out again with carb cleaner, good flow from accelerator pump diaphram, re-set the float to stock specs (was not off much), now bike will not even start on choke. Ok, more things to try:
1. Is the plastic fuel intake elbow entering the carb removable? If so, maybe I could carb cleaner from there to the float valve.
2. Even though I drained and flushed the tank, I did not remove the petcock and clean the filter screen. But the gas drained out of the tank ok.
3. Plugs foul slightly everytime I try starting it with the choke on. But they are still firing ok.
I can't help feeling that it all comes down to the spooge that was in the fuel line when I first drained the tank. And if some had entered the carb, seems to me it would first clog the float valve.
4. Still have not removed or changed out the float needle as I haven't been able to budge the float pivot pin. Anybody got a trick for that? |
Sportyeric
| | Posted on Tuesday, July 19, 2011 - 03:08 am: |
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Could the diaphragm be torn or improperly installed. You are looking for either blockage of the fuel on the idle circuit or excess air that requires enrichening to make up for it.
Are you sure that there is continuous fuel flow to the carb bowl? Hypothetical: slow drip of fuel fills bowl. Bike starts. Push in choke. Bike stalls. But not because you pushed in the choke. Just because the time was right to run out of gas. (Just thinking outside the box.) |
Shotgun
| | Posted on Tuesday, July 19, 2011 - 11:00 am: |
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Also pulled the in-tank fuel filter/strainer, it was clean. Flushed tank again and refilled thru Mr. Coffee filter. A few tiny granules, but nothing the strainer would not have stopped. So any blockage is now in the carb, not in the tank. |
Blake
| | Posted on Tuesday, July 19, 2011 - 12:54 pm: |
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Ensure that float bowl breather port is open, unobstructed. |
Sparky
| | Posted on Tuesday, July 19, 2011 - 01:25 pm: |
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The only way I've been able to remove the float pin without fear of breaking something is to remove the carb and support the casting on both sides of the pin and gently tap the pin with something smaller in dia than the pin. I'll say that again: GENTLY tap it. You might have to try tapping it in the other direction if it doesn't want to move readily.
Also it might help to apply some penetrating oil/solvent to the area around the pin, let it soak for a few mins then start tapping. |
Shotgun
| | Posted on Tuesday, July 19, 2011 - 04:44 pm: |
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Bowl breather is open. I got the pin out. The float valve was in good shape, the port wide open. Put a crack in the float where the pin goes thru it. Hafta see if the local (40 miles away) HD will have a CV float. Last time I was in, I asked for a pair of spark plugs, and they said they were no longer doing anything for Buells. I said "It's a Sportster part". But he blew me off, wouldn't even look it up. |
Shotgun
| | Posted on Tuesday, July 19, 2011 - 07:04 pm: |
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Ok, ordered new carb piston with diaphram, float, jets, idle needle. Should have just ordered a new carb. Oh well. Hope they do the trick and I get them in time for SPLASH this weekend. Thanks for all your advice. |
Shotgun
| | Posted on Tuesday, July 19, 2011 - 07:06 pm: |
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PS It was a 48 slow jet installed, maybe the needle valve couldn't close enough to compensate? But then why did it run ok before? A mystery still. |
Two_seasons
| | Posted on Thursday, July 21, 2011 - 06:45 am: |
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Shotgun:
If new parts don't do the trick, call Al at American Sport Bikes . com Al can set you straight. |
Shotgun
| | Posted on Friday, July 22, 2011 - 06:54 pm: |
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Defeated, deflated, demoralized and depressed. Clean tanked and filter with fresh gas and checked tank vent. New fuel line. Fuel inlet chear. New float valve and float, float adjusted to specs. New slow jet (tried both a 48 and a 45). Cleaned high speed jet. Cleaned all open orifices. New idle mixture screw with fresh O-ring, washer and spring. Tried 6 settings from 1 turn to 3.5. New intake manifold seals. Piston diaphram in good shape. New accelerator pump diaphram.
Now it is reluctant to even start on choke. New plugs. Good spark. Gas getting to plugs. Carb off 12 times. Thanks for the help but I will miss SPLASH this weekend. For what I paid in express shipping this week for parts, I could have bought a new carb. Were my other 5 Buells less bother, or am I getting too old to fart around with them? Take care. |
Christaylor
| | Posted on Friday, July 22, 2011 - 07:41 pm: |
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Sorry to hear that Shotgun, gonna miss you. Did you try with the gas cap off? Plugged vent line? And this was a California bike originally, are all the canister lines blocked off?
Don't give up, you need a bike to get out on.
Good Luck,
Chris |
Christaylor
| | Posted on Saturday, July 30, 2011 - 12:45 am: |
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Shotgun; update? How's the project going? |
Shotgun
| | Posted on Monday, August 01, 2011 - 11:45 am: |
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Installed a Mikuni HR42 from Am Sports Bike. Unfortunately, the bike has the same problem. If I hadn't replaced the manifold seals, that would have been my target. Turning it over to Doyle's HD in Eugene. If it is something simple, I will kick myself but I'll be happy. Old CV 40 available as parts donor, everything on it is new but the body. |
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CV 40 starts on choke, will not run without it