kz1000J, Popping at Idle and While Riding
- missionkz
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IMHO, those kind of suggestions from a shop are mostly to shine you on and blow you off.Vintage3 wrote: Thanks. Put in new gas. Bike is definitely running better after a few kilometers with less back firing - but it is still popping out of the exhaust. There is also a little hesitation off the start. I was told by my shop to run a tank or two on the new gas and it should resolve itself. Is this the case primarily because there could still be gunk in the jets - assuming there was with the old gas? If there was no gunk, I gather the new gas would deliver good performance right away.
Also is it bad for the bike to ride it in this popping condition?
Assuming you don't have a flakey electrical ignition thing going on....
I've never heard of any modern mixed fuels that go so bad in 30 days or more, that you have these kind of problems. You could try dumping a can of carb cleaner into the fuel tank and see if it helps.... Why? Because it's much more likely that there was some previous crap in your tank and or fuel line(s) that is now in your carbs.
If said junk is insoluble with carb cleaners, you get to pull them apart and physically inspect and remove junk.
And why do so many guys instantly start talking about checking your valve clearances? Unless you ran the bike out of oil the last time it was operated, they just DO NOT change that radically in such short times.... that's simply crazy.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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- SWest
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- 10 22 2014
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IMO
Steve
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- missionkz
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I am not saying 100% it is the carbs. It could be a advance mechanism problem... etc.
IMHO, gas does not go bad enough in that short amount of time to create these issues.
Dirt, rust, debris falling out of the tank, shut off valve and fuel lines can do all kinds of weird things to these carbs.
What plastic parts in the carbs are you talking about?
I don't know what the floats are made of but I've soaked them in raw carb cleaner for years with no issues.
Most plastic parts are some kind of nylon anyhow, aren't they?
I've rebuilt dozens and dozens of carbs in my lifetime and have NEVER had any carb cleaner ruin any parts.
The only down side is that carb cleaner is not good enough alone... you need to replace some brass parts, polish or replace needle and seats, use compressed air and very very thin piano wire of various diameters to push crap through orifices... etc.
Also I have never had Stabil fuel additives do anything but exactly what it is sold to do.
Just dump it all out for the next riding season.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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- Vintage3
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- Patton
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Vintage3 wrote: ...popping out of the exhaust. There is also a little hesitation off the start....
Would first suspect carb pilot circuits are not as-new clean.
Good Fortune!
1973 Z1
KZ900 LTD
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- Vintage3
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- missionkz
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Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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- SWest
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Steve
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- Vintage3
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- SWest
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Steve
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- missionkz
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Keep the tank full to the top!
Yes. For some reason I was under the impression that this gas was only a couple three weeks old, not a year or so and full of Stabil.
Better dump it all out and start over...
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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