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kz 550 power loss
- michalw
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- Patton
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Would suspect too tight valve clearances.michalw wrote: I have a kz 550 and after the engine warms up it looses power. It just revs real slow under load but revs fine in neutral. when the bike is cold it runs good. I have rebuilt the carbs with stock jetting and replaced the coils with used ones from a 1981 kz 550. also has dyna s ignition. Any ideas what could cause this? Valves possibly? the bike has 13000 miles.
Minimal clearance allows sealing when cold, but disappears as the engine warms.
If valve clearances found within specs, would remove and examine the spark plugs to diagnose a possible over-rich fuel mixture.
Could result from such things as dirty filters, too high fuel level, etc.
Good Fortune!
1973 Z1
KZ900 LTD
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- ZERO
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Only Kawasakis have a soul 1977 Kawi KZ1000 special 2000 Kawi ZRX1100
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- loudhvx
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Also read the valve train warning before you start checking the valves.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- michalw
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- ZERO
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Only Kawasakis have a soul 1977 Kawi KZ1000 special 2000 Kawi ZRX1100
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- martin_csr
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A simple way to check the coils is to ride the bike at high speed if possible to warm it up, then stop & feel them to see if they are getting hot to the touch - press hard w your fingers - don't get burned by the valve cover. They should be warm, not hot. My bike was running odd at speed - the coils were getting hot, hot, so I replaced them w green Dynas from Z1Enterprises.com.ZERO wrote: An ignition coil that is failing will often fail when it heats up..and then work again once it cools. The igniter would just fail and the Dyna is probably O.K. unless you have a pinched wire.
Something else. A bad battery can cause the bike to run poorly.
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- loudhvx
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1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- michalw
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- michalw
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- bountyhunter
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michalw wrote: so i got the valves adjusted and carbs synced and it still had the same power loss issue so i swapped the coils with ones from my dads goldwing which had the same omh reading and still did it. so then i took off the cover for the dyna s electronic ignition and took it out for a ride and had no more power loss issues, could the dyna s be causing the power loss after it gets warm?
Yes, for sure. That is exactly what flaky electronic devices do. But as pointed out, make sure the cover isn't touching anything.
1979 KZ-750 Twin
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