Question about 1996 kawasaki VN 1500 Vulcan Classic

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Can't start cold with choke, have to half throttle it; can't keep it running at idle, even on road; throttle thumb screw unresponsive; pops on decelleration.

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Check visually to see if needle jet is moving up with slide when twisting the throttle. Another way to check is to remove top carb. cap, remove slide, check that the needle jet is attached. Hope this helps.

Posted on Sep 02, 2010

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1 Answer

Why doesn't my 1997 Kawasaki Classic 1500 model start when cold?


Hi Nigel:
Cold starts require a rich fuel/air mixture. That's what the choke is supposed to do. Is there a way that you can check your choke linkage to make sure it's working? It may have a loose clamp or screw, and even though you think you're choking it, you're not. Another thing, some of these bikes don't like throttle with a cold start. My '08 Yamaha is Choke on, No throttle. Start, Idle until warm. Choke off, Go play!!

Apr 27, 2015 | kawasaki Motorcycles

1 Answer

95 suzuki 250 quad king, at full throttle it runs at half power, choke seems inop


First make sure your choke circuit is working. May be an indication that your carb needs to be cleaned. I wouldn't replace it yet= clean it. If the choke circuits and the carb check out fine. An unresponsive motor/ carb usually means bad valves or valve timing. Example: it runs rich, spits fuel out the carb no matter how lean you set it. Even with the idle air closed it runs rich... intake valve is not closing or closing late. In that case it needs valves serviced.

Aug 26, 2014 | Motorcycles

1 Answer

I have a 1986 GMC 1500 with a 5.0 and stock rochester carb. The truck will start but you must keep gassing it as it won't idle. It kicks off every time. Any suggestions on how to fix this cold natured


fast idle speed screw, works off the fast idle cam which the choke adjustment sets, it works together by linkages. This is the raised idle speed setting you need to keep a cold engine running. First you set the idle speed by the idle speed screw with engine at normal operating temperature. Then you set the linkage up so the cam is on a raised step, throttle will be held on that raised step. then you can turn the idle speed screw to get idle at about 1500-1800 rpm. Now when you start engine cold, choke will set the fast idle cam on that raised step- when engine starts and runs it should be running at your fast idle setting. That's how it supposed to work, you just have to get everything adjusted right. I hate carburetors, they never stay adjusted right. Considering their complexity and small mechanical parts, no wonder.

Dec 24, 2013 | 1986 GMC C1500

1 Answer

1996 sportsman 400 wont idle. Had the carb cleaned by a "mechanic" after the bike took off wide open and driver was injured. He said the float stuck and he "fixed" the problem. Now...


I have NEVER heard of a float sticking and causing that issue. Sounds to me like the Electronic Throttle Control (ETC) on the right handlebar isn't or wasn't adjusted. There is a thumb nut on the throttle cable coming out of the ETC switch. Loosen the screw and turn the cable in or out to get 1/16 to 1/8 inch freeplay on the thumb throttle. Too loose and it won't idle, too tight and it will pull the throttle cable tight and rev engine. It could also be a carburetor issue if it runs with choke. Either the idle screw isn't adjusted or the pilot jet is plugged. There is a large thumb screw coming off the carburetor, turning clockwise will turn the idle up. Let me know if you need anything else, Daniel.

Sep 18, 2011 | Polaris ATV

1 Answer

What position should the choke lever be when starting a cold 1986 Shadow motorcycle?


The rubber cover can be tightened or loosened to hold the choke lever in place. I like to set the rubber cover just tight enough to keep the choke out but if I start driving it starts to slip back in by itself. If you pull the plunger all the way out it will raise the idle and should be the best position for the initial start. You may find you have to touch/ twist the throttle just a teeny bit to get the first pop. Then run full choke for the first 10-20 seconds till the fast idle is steady. Then push in the choke till you have a slower more comfortable fast idle. At 45-60 seconds push the choke in just enough to keep it idling. It should be safe to slow drive with the choke out about a quarter of the way. Take the choke off completely when the bike will idle on it's own 1 to 2 blocks down the road. If the bike is still boggy on take off put enough choke back on to get a smooth take off , then while slowly cruising during warm up push the choke all the way back in. Take it easy till the engine is warm.

Mar 02, 2011 | 1986 Honda VT 500 C Shadow

1 Answer

1.9 L starts just fine but will not keep running at idle. Stalls when coming to a stop (automatic). Just changed oil, didn't help. If I hold the idler arm just a tiny bit, runs just fine. Please...


With carbureted cars, the idle speed was set by adjusting a small screw that held the throttle open just a little. That screw rested on a sort of a disc with graduated steps on it, the fast idle cam. When the choke was partially or fully closed, that disc was turned a bit to present a higher step for that throttle-adjusting screw to rest on, providing a higher idle speed during warm-up.

With fuel injection, there is no choke, and the throttle blade almost completely closes at all temperatures and states of warm-up. When the richer mixture is needed that a choke used to provide, the Electronic Control Unit (or Electronic Control Module) simply flows more fuel through the injectors.

There also is a short (incha and a half, maybe?) air passage that opens onto either side of the throttle blade, a bypass passage. There is an electrically controlled valve in this passage.

When the engine is cold, the ECU opens that valve a little more to produce a faster idle, as the "fast idle cam" used to. When the air conditioner is turned on, presenting a load to the engine, that valve is electronically opened just a little to keep the idle speed the same even with the higher load. If the car has an automatic, when it is put into gear, that valve is opened a little to keep the engine running with the additional load the torque converter applies to the engine.

All of these idle-speed adjustments make use of a tachometer function in the ECU.

Now. These bypass air passages can become blocked, and the electrically operated valve (it is adjusted through a motor turning) can get enough accumulated crud on it to prevent its operation.

I would recommend first locating that bypass passage and its valve, disassemble that and clean everything carefully. Reassemble and see if all is well.

If not, I would think the ECU or its wiring is where the problem lies. Naturally, look for the connector that might have fallen off the bypass control valve, and so on.

The fact that the engine runs would seem to argue that the tachometer function and the accompanying circuitry are working correctly.

Aug 09, 2010 | 1999 Saturn SL

1 Answer

Will start with some amonut of choke on, but will ...


Carby carby carby!
Give the carby a flush with some Carby Cleaner. (retail 400g aerosol can)
Check condition and clamping of inlet manifold for cracks, warping or air leaks.
Reset Slide Needle one notch down.
Turn air mixture screw fully in and back out one and one half turns and try idling now.
When you get engine idling turn the air mixture screw in or out to the highest revs without use of throttle. Reset idle to optimum speed with throttle stop or idle screw.
Cheers.

May 19, 2010 | 2001 Yamaha SR 125

1 Answer

Bike wont kick start or idle , it will coast


first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle.
When warm, no choke, and a little throttle when kicking.

May 12, 2010 | 2003 kawasaki KX 125

1 Answer

What kind of carb does the 76 c10 4x4 come with need to adjust


mcdevito75 here, The fast idle is needed when the engine is cold to make the air and fuel mixture rich to keep the engine running while cold, the carb. choke doew this with a bi-metalic spring in that balck round box on the side of the carb, a screw also hepls keep the choke closed until warm up, this screw can be adjusted tpo control how tight it holds the choke cloesed, here"s how to adjust this screw to slow fast idle speed, Locate on the carb, where the gas pedal connects, have a friend operate the gas pedal with the engine off, once you locate the linkage, you"ll also see 2 screws with springs around them, 1 is for fast idle the other for regular idle, you want the fast idle screw, notice this screw will lay against and Half moon shaped tab, while the other screw lays against a shaft, you need the screw that lays against the half moon shaped tab. Start the engine and step on the gas pedal slightly and relaease, at the screw that lays against this half moon, simply turn it counter clockwise or toward you just 1 2 or 3 turns very slowly, you'll hear the fast idle come down but you don"t want the fast idle to low, listen to the engine very carefully, slow it down just a bit, it should still race though but not out of control. Of course for a full carb, adjustment the shop should handle that., but this info will help.

Mar 29, 2010 | 1978 Chevrolet C1500

1 Answer

2004 Ford F250,6.0 Deisel .When starting cold,won't turn above1500 RPM,without choking out black smoke,hacks and coughs till back to idle then idles fine ,not drivable till idles for half an hour,will not...


Ford 2004 6.0, Driving down road seams like when it starts warming up it starts Missing or accelerating,jerking,as long as you keep the acceleration it seems to work as soon as you level it out it starts missing,even dies at stoping sometimes...Changed fuel filter, put fuel additive in tank still missing,HELP

Jan 02, 2010 | 2004 Ford F250

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