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Strange Spark Issue /
- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- TomW
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- Keep the blue side up.
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'78 KZ1000B2 LTD stock + Vetter Fairing & luggage
'91 ZG1200B5 Voyager XII, stock
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- TomW
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- Keep the blue side up.
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Worn or broken rings or bad valve stem seals and/or too much valve stem clearance. Does the exhaust smoke as the engine is decelerating? If so the high vacuum is sucking oil past the intake valve seals. Does it smoke pretty much all the time when running? If so then probably the rings or the exhaust valve seals are at fault. A leak down test will tell a lot about the internal condition of the engine. If the bike sat unused for a long time the rings may have rusted and stuck to the cylinder walls when re-started the rings can break causing problems like low compression and oil burning/consumption. Are the spark plugs the correct heat range? Too cold plugs will allow deposits to form on them. Could also be a leaky head gasket. There is an oil passage close the the outside cylinders along a head/cylinder bolt. Do the leak down test first, if that doesn't tell you something pull the head and look inside.BIGKEVIN wrote: The plug is oily and smells like gas when it is pulled. I have not chedk the other 3 plugs yet. What would cause the plug to be oil fouled ?
'78 KZ1000B2 LTD stock + Vetter Fairing & luggage
'91 ZG1200B5 Voyager XII, stock
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- Patton
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Plug might be getting fuel-fouled.
Might result from too rich pilot air screw adjustment.
Might result from too high fuel level.
Would perform clear-tube test.
Good Fortune!
1973 Z1
KZ900 LTD
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- Patton
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Weak spark;
Poor compression;
Valve clearances not within specs.
Would measure voltage being received at the coil, and compare against voltage measured between the battery posts. Should be the same.
Would remove the plug, hold it against engine, spin over the engine and look for fat blue sparks.
Good Fortune!
1973 Z1
KZ900 LTD
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- Patton
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Still running points ignition?
Original coils?
Good Fortune!
1973 Z1
KZ900 LTD
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- bountyhunter
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Edit to add:
all good suggestions above that did not appear when I first answered since the server here froze up again and did not display the thread replies.
Gas or oil fouling, a bad coil will also foul plugs.
1979 KZ-750 Twin
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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- MFolks
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1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)
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- BIGKEVIN
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1976 KZ900
2006 ZX6R
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