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Throttle hesitation
- jwe2
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To make a long story short I have been fighting mechanical and electrical problems for quite some time and until now the bike wouldn't even fire. I've replaced coils, plug wires, redid the timing, new manual cam-chain adjuster...the list goes on.
While the bike fired up nicely and idled, it had a serious hesitation when I gave it a small amount of throttle. It hesitated to the point where it would have shut off had I not let off the throttle. I was however able to rev the engine high, it just seemed that under 4k or so rpm it wanted to hesitate/bog down and die.
I did not replace the pickup coils yet, not sure if they are bad and possibly sending a weak spark? Also I need to pull the spark plugs tomorrow after I run it for a little while to see what they look like, maybe I just need new plugs? I'm not sure what the issue could be right now.
If anyone has any thoughts, I'd appreciate the input, Thanks
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- bountyhunter
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Timing advancer
Fuel bowl levels (clear tube)
vacuum leaks
Clean fuel tank/petcock
1979 KZ-750 Twin
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- MFolks
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Ohm Checking Pickup(Pulsing) Coils
The pickup coils on the Kawasaki’s with the factory supplied electronic ignition can sometimes fail or become intermittent due to heat and vibration.
1.Trace back from where the pick up coils are mounted,(under a right side CD sized cover) locate and disconnect a small 4 pin connector. Using a multi-meter set on OHMS and range of 2K, check between the BLUE and BLACK wires(#1 and #4 sparkplug wires) for between 360- 540 OHMS.
2.For #2 and #3 sparkplugs the wire colors will be YELLOW and RED, again 360-540 OHMS.
3.If the pickup coils are suspect of failing due to heat, they can be stressed using a hair dryer without the need of the engine running.
4.A replacement set of pickup coils might be obtained from a dealer who serviced the police Kawasaki’s.
5. If replacement pickup coils are not available, your next choice would be to order a Dyna “S†electronic ignition system from www.z1enterprises.com It replaces the IC igniter with a smaller module located where the mechanical ignition advancer was mounted.
6. Checking with Kawasaki.com website has determined that the Pick up(pulsing) coils are available . The pulsing coil # is 59026-1133 and replaces the older # 1002, 1012 which were used from the MKII motors until the 2005 P24.
7.Check the small 4 pin connector that the pickup coils connect to for corrosion/loose pins too.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- jwe2
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- MFolks
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Another method is to use an UNLIT propane torch(less messy this way). Either method if you have a vacuum leak will cause the rpm's to go up. Then the fun begins in ordering new parts.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- KZ250LTD
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- JR
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I think those TK carbs on the 550 have a similar type of float bowl to those on my CV34s where opening the drain screw allows the fuel to run out the overflow nipple.
In which case the procedure would be exactly as you described.
1980 kz750E1, Delkevic exhaust
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- Polar_Bus
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Hello all, after slowwwwwwly rebuilding my 81' kz550 over the summer I finally was at a point to try starting it today. Hooked up my little soda bottle full of gas to the fuel line and she fired right up!
To make a long story short I have been fighting mechanical and electrical problems for quite some time and until now the bike wouldn't even fire. I've replaced coils, plug wires, redid the timing, new manual cam-chain adjuster...the list goes on.
While the bike fired up nicely and idled, it had a serious hesitation when I gave it a small amount of throttle. It hesitated to the point where it would have shut off had I not let off the throttle. I was however able to rev the engine high, it just seemed that under 4k or so rpm it wanted to hesitate/bog down and die.
I did not replace the pickup coils yet, not sure if they are bad and possibly sending a weak spark? Also I need to pull the spark plugs tomorrow after I run it for a little while to see what they look like, maybe I just need new plugs? I'm not sure what the issue could be right now.
If anyone has any thoughts, I'd appreciate the input, Thanks
Do you have the stock airbox or aftermarket pod filters ?
Bikes:
'84 GPz1100
'06 HD Fatboy
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- jwe2
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I'm about to go start the bike and start looking for leaks, check the resistance of the pickups, etc...I'll let you know what I come up with. I'll try and take some pics of the bottom of my carbs if that helps. Thanks for all the help!
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- jwe2
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Checked the resistance of the pickups. At first I got nothing, zero readings and then infinite. Then for some reason I got the normal reading of 450ish on both pickups, and with my last test I got infinite on both again. I'm going to try out another multimeter just in case, but I think I might order a dyna-s ignition and be done with it. The #2 and #3 exhaust pipes felt less hot than #1 and #4. They definitely were not cold and would have still possibly burnt me, but there was a noticeable difference. Could the pickups be intermittent and causing this problem? That would possibly explain my funny readings.
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- Polar_Bus
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Bikes:
'84 GPz1100
'06 HD Fatboy
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- Capt America
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What you're describing doesn't sound electrical to me. It sounds like fuel starvation, and possible air intake leaks. Could just be my fortune, but I've never seen a pickup die in over 30+ years. I suppose they do sometimes.
Here's my short list:
(1) You checked resistance with pickups disconnected from transistor box, correct??
(2) Did you check pickup for voltages with them plugged in and key on? Your book should have what voltage it should have on either side.
(3) Do you have all the air mixture screws at the factory starting position? Tweaking from there is a much simpler job.
(4) Do you have all the inlet nipples plugged off? Air filter in and cap on box, intake boots are properly aligned?
You said you were using a soda bottle for fuel delivery, it's vented I assume. I'm also assuming since it's an 81 you probably have a vacuum assisted petcock on the actual tank, so that could possibly have you with at least 1 nipple not blocked off.
Capt A merica
1983 K1 750 twin
Ontario, Canada.
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