Question about 1985 Yamaha FZ 750 FN (Europe)

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Not runing

I recently purchased a yamaha FZ 750 FN that needs work. It seems like the problem is only one of the two cylinders is firing. I checked the plugs (both are new) and the running side fires plenty hot and the bad side seems to make little to no spark. Replacing the rectifier was suggested to me, does that sound like a good place to start? Also what about a coil. It is a single coil with 2 plug wires so it seems like if it were the coil, it wouldn't fire at all. Thanks for the help.

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  • Anonymous Mar 18, 2014

    changed coils and both work new cdi box new stater and pick coil and rectifier.and still no fire on front cylinder.tested relay found one not working on ignition side all fuse;s are good help


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Switch plug wires and see if the dead cylinder starts firing --if it does you need new wires

Posted on Nov 10, 2008

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SOURCE: What tipe MOTOR oil use yamaha 750 FZ, 1987 YEAR

a good 10w40 oil..if you dont know what type was used before then i would flush the engine then put the new oil in

Posted on Jun 19, 2009

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No spark dont know how to check stator on 1985 fz 750 yamaha or were it is

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Got a 750 fz only fiering on 1 cylinder ,right front sitting on bike, not getting spark to 2/3, changed coil, still not working

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Apr 22, 2010 | 1986 Yamaha FZ 750 TV (Europe)

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Hi,i`ve got a yamaha fz750 1988..and it won`t seem to run on all four cylinders..i took the air box off and while it was running put my hand over each carb one at once and found that on carb 4 it stopped...

Hi JIm,
If it stopped @ 4 tht means thts the only cylinder firing .
Remove the spark plugs,earth @ on the cylinder head, crank start and check for sparks...if its sparking tht means the coils etc. are ok.
As the spark plugs are out exam them to their conditions visit this site for more details :-

From here you would know if its carburator or probably it may need a complete tune up....carburator cleaning, float level..adjustment, valve clearance.. new plugs (gap to specs.), check air filter, replace or fit 'inline' fuel filter thn balancing of the carbs.
Hope this helps!

Oct 29, 2009 | 1987 Yamaha FZ 750 MG (Europe-US)

1 Answer

No spark ??? checked the coil and replaced it how do i check the cdi box and the pickup on a 2001 yamaha warrior

check the wires that come into and out of the cdi box
if no voltage there check stator for voltage

Jul 07, 2009 | 1985 Yamaha FZ 750 FN (Europe)

1 Answer

Find fz750 manual

Here is the site you can get user manual

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What tipe MOTOR oil use yamaha 750 FZ, 1987 YEAR

a good 10w40 oil..if you dont know what type was used before then i would flush the engine then put the new oil in

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2 Answers


Sounds like fuel is still entering one cylinder after releasing the throttle. Time to have your carbs cleaned as well as synchronized. Good Luck!!!

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