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Missfiring cylinder, Is it my carbs??
- jimstan
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1. Cylinder good.
2. You have Good Spark.
3. Carb,s are clean.
??
Pilot circut ?
Did you check to make sure that you replaced the "O" ring and washer behind the pilot screw ?
The "O" ring and washer are only as big as this ( O )
Take a look at this, might help ?
www.thegsresources.com/files/GS%20Carb%20Cleaning%20Series.pdf
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- 88alltrac
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First, original airbox with new clean filter.
Flow out of petcock is good.
Fuel filter is new.
Have tried running it with the gas cap open.
I have sprayed starting fluid into the intake of #4 carb before and then it does fire for a short burst.
So it must be something in my carbs then.
I just got 4 new float valves in the mail that i will put in but i am not sure that is any of the problem anymore.
As a side note I did a compression test with the engine cold and it was 140. then i did one hot and with the engine running and it was only 80 psi. is this normal for it to drop when it is running instead of just cranking with the plugs out?
81 KZ1000 K1
Lincoln NE
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- 88alltrac
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81 KZ1000 K1
Lincoln NE
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- 76 LTD
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- gane
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[img][/img] 1977 KZ1000A1
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- 88alltrac
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81 KZ1000 K1
Lincoln NE
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- 88alltrac
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dont have these tubes. i have a set of bs34's. original to this bike.The float bowl vents are the little brass tubes between 1nd2-3and4 carbs if these are plugged it wont run right they need to be vented.i ran the lines from mine down between the pod filters and just let them hang.assuming it misses at idle try turning the mixture screw on #4 carb all the way in then back it out and see if the cylinder picks up for a few seconds if it does you have a fuel problem.possibly a partially plugged low speed circuit.
i am not really sure where they vent too but i have no brass tubes on the outside of the carbs.
81 KZ1000 K1
Lincoln NE
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- 88alltrac
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one little problem still. it pops a little out of the pipes. i am not quite sure what is causing this. my carbs might need synching which i will do again soon. there is still a little hint of a vibration higher up in the rpm range but much better than it was before.
so i got it running much better but it isnt quite perfect yet.
and i didnt try loosening the float bowl on #4 and running it like that.
81 KZ1000 K1
Lincoln NE
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- 88alltrac
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topped off the gas when i got back and parked it. came back 4 hours later and there is a puddle of gas that has dripped out of my airbox. start it up runs like crap. obviously fuel fouled spark plugs. now i know my petcock isnt working but shouldnt the float valves hold it. they are brand new.
81 KZ1000 K1
Lincoln NE
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- Patton
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ok so i took the bike on a quick 150 mile ride today and it performed beautifully. it ran great.
topped off the gas when i got back and parked it. came back 4 hours later and there is a puddle of gas that has dripped out of my airbox. start it up runs like crap. obviously fuel fouled spark plugs. now i know my petcock isnt working but shouldnt the float valves hold it. they are brand new.
At least one float valve is leaking for whatever reason. Could be grit or crud. Maybe a float issue.
Would hasten to assure that fuel has not invaded the crankcase and contaminated the oil. Sniff-test and physical examination of oil condition.
As this problem may also occur while riding, a properly functioning petcock is not the ultimate solution.
Good Luck!
1973 Z1
KZ900 LTD
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- 88alltrac
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the float valves and seats are brand new and i have a fuel filter on it.
perhaps the floats are binding up somehow.
81 KZ1000 K1
Lincoln NE
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- 88alltrac
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81 KZ1000 K1
Lincoln NE
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