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Gord
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Joined: 21 May 2012
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Location: Teesside
PostPosted: Tue Jun 11, 2019 6:27 pm    Post subject: YZF 750 not firing on No3 cylinder Reply with quote

My YZF started running on 3 cylinders last week, I replaced the spark plugs, took it for a run then checked the plugs. No3 plug was still as new and clearly had not ignited any fuel, I found a set of spare coils and checked all coils, leads and caps with a multimeter to make sure they weren’t faulty and that a spark was present, to cut a long story short no matter what combination of coils or plug leads I tried No 3 cylinder is not firing.
I also checked fuel was getting into the carb bowls, took the carbs off to check the rubber mounts for splits, checked the diaphragm for splits and sprayed the jets with some carb cleaner (not a full strip down).
Could this have anything to do with valve shims and would a compression test show up any issues, any help is appreciated.
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Teego
More Rabbit Than Sainsbury's
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Joined: 14 Mar 2006
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Location: On the road again.
PostPosted: Tue Jun 11, 2019 8:00 pm    Post subject: Reply with quote

Won't be valve clearances. If you have a reliable spark at the plug it's a fuel issue.
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Fatdog
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Joined: 12 Jun 2013
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Location: East Yorkshire
PostPosted: Wed Jun 12, 2019 12:08 pm    Post subject: Reply with quote

I would agree with Teego, it's a fuel issue.
Could be a faulty float needle valve.
I've had one go before.
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