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Old 07-05-2011, 06:01 PM
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Fh 680v sparks but no combustion on one cylinder???

Hi I have a Fh 680v sparks but no combustion on one cylinder???
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Old 07-05-2011, 07:02 PM
pugs pugs is online now
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Do a compression and leakdown test.
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Old 07-10-2011, 12:39 PM
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Bent pushrod, Valve guide moved, valve stuck open, bad intake gasket. Could be one of the above. As stated, need to do leakdown and compression test to point you in right direction. Have also seen good coil, but plug won't fire under compression
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Old 07-29-2011, 08:58 AM
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60 psi I am going to replace both coils or should I just replace the one.
I Need the cheapest place to buy the coils.
Napa doesn't have it in stock.
And will charge me freight.
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Old 07-29-2011, 09:08 AM
pugs pugs is online now
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Why are you buying coils if the ones you have are working? 60PSI is low. Do you have 60 on both cylinders or just one?
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Old 07-29-2011, 11:03 AM
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Quote:
Originally Posted by pugs View Post
Why are you buying coils if the ones you have are working? 60PSI is low. Do you have 60 on both cylinders or just one?
DITTO...........
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Old 07-29-2011, 05:54 PM
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Kawasaki says 57 psi min.
70 on one and 60 on the other.
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Last edited by weapons of grass destruction; 07-29-2011 at 05:59 PM.
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Old 07-29-2011, 07:01 PM
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Quote:
Originally Posted by weapons of grass destruction View Post
Kawasaki says 57 psi min.
70 on one and 60 on the other.
Feel free to replace both coils. When that does nothing for you maybe then you will do a leakdown test and find the actual problem.

60 and 70 is not good for that engine. I have never seen one that low unless something was wrong with it.
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Old 07-30-2011, 01:32 AM
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Those psi figures don't sound right, as a rule I like to say at least 100 but I think you're not getting
a good seal on the cylinder with the testing device because with 60 and 70 psi's that engine wouldn't
run on just one cylinder, it likely wouldn't run at all so I would re-do the test and make sure you get
a good seal with the testing device that records the internal engine pressure.
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Old 07-30-2011, 06:40 AM
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Will do thanks guys.
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