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VM24 SS Carb Settings (Straight Pipes & Pods)
- Patton
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Good Fortune!
1973 Z1
KZ900 LTD
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- Sircraigery
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How do I test it though? I figure, as soon as it's coming out of the overflow, that must mean it's too high. I'm not sure how to test them with clear hose. Just bend to tube up vertical to the carb and see how high the fuel goes?
On second thought, with this method I can figure out exactly where the fluid level should be. The fuel level should be between the jets and the overflow, and that's about it right? Just make sure the pilot and main gets are submerged, and you should be good to go?
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- Patton
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1973 Z1
KZ900 LTD
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- Sircraigery
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I put the one bowl, that I could actually get the drain screw out of, on the outside.When I get a chance I'll try your method to verify the fluid level.
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- Sircraigery
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It starts easy, but only with choke (while it's cold). I can cut the choke within about 2 minutes of idling, without having the bike stall. It idles good. Throttle response is good and fast.
Once it's warm, on acceleration, initially it bogs a bit, then picks up fine once rpm rises a bit. On deceleration, it sputters and pops. I can get to 135 km/h or 84 mph on the highway but I think this is a tad slow for it.
Anyone have any suggestions?
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- Patton
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....
Sircraigery wrote:can get to 135 km/h or 84 mph on the highway but I think this is a tad slow for it....
In the video, bike sounds like it's running on just 3 cylinders (sometimes maybe just 2).
Would spray water mist on headers while engine's running to determine which cylinder(s) is/are missing. Use a common household hand-held plastic water-spray bottle. Must be plastic, as glass won't work, and neither will the commercial versions as mostly seen at intersections.
If cylinder is combusting, mist will sizzle and instantly vaporize when hitting the header pipe. Otherwise, water will just run down the pipe.
Bike should do 84mph in 3rd gear, even as a hardtail. Is it being shifted into 5th?
Imo, need to start with ---
--- Valve clearances to spec, plus compression test.
--- Then check ignition timing dynamically (engine running) with timing light, including verification of proper advancer function.
--- Using four brand new spark plugs of correct spec, attached to plug wires with bases held against engine head, spin engine over and visually examine spark quality. Look for healthy blue spark.
--- Figure out how to remove drain plugs, and perform a proper clear tube test, which shows actual real world fuel level inside float bowls, and don't rely on the float height, which is notoriously inaccurate. Repeat over and over, "It's fuel level, not float height."
--- After all the above (done correctly), finally address carb settings and internals. Imo, the pilot circuits remain imperfect for whatever reasons. And jet needle clips may also be in wrong slots. Would use middle-slot clip position for initial testing.
Perhaps the pilot circuit is responsible for so quickly fouling the spark plug, that the mid-range jet needle setting never stands a chance.
Good Fortune!
Wear protective goggles while using spray carb cleaner.
[Click on image to enhance view.]
1973 Z1
KZ900 LTD
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- tinlizzie37
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Bob KZ 650 E1, En 450
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- Sircraigery
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Not sure if that changes anything. I can't seem to find any good info for troubleshooting carbs online, with the symptoms I have. Thanks again to everyone.
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