Question about Honda CB 750 Motorcycles

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Number 1 cylinder not firing. it has spark to the plug and when i remove the plug it is wet.i have switched the plug but still not running on that cylinder. i checked the carb and it is getting fuel and the float is not sticking. any solutions?

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Valve burnt out.Check comprsestion on that cylinder first.

Posted on Jul 20, 2009

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Why isnt number 4 cylinder firing i replaced the coil pack

the spark plug might be wet from before you replaced the coil no spark only fuel
remove and clean the plug
if its not the plug it might be the injector not supplying fuel
or no compression in that cylinder

Oct 18, 2016 | Cars & Trucks

2 Answers

Number 1 cylinder not firing. why not?

Space bar broken?

Can only be a few things.

incorrectly gapped spark plug.
faulty or worn out plug.
broken or damaged ignition lead
worn out distributer cap
bad coil pack

Listed in likely order which is also lowest to highest cost.

First though, try this. In pitch darkness, run the vehicle, Look around the ignition and see if you see arcing sparks to the number 1 cylinder. Have seen that before with a faulty lead and with a faulty spark plug cap.

Dec 10, 2015 | Vehicle Parts & Accessories

1 Answer

I'm getting codes, p0301 and p0316. I replaced the spark plugs and cylinder 1 spark plug was wet when i removed it. What could it be?

Code 301 is a cylinder miss on cylinder one, and 316 is a miss detected during startup which is probably caused by code 301.
If the plug is firing, you could have an injector problem on that cylinder.

Apr 22, 2013 | 2002 Mercury Sable

1 Answer

I have a 94 gsxr 750. It has been running bad so my buddy had me spry water on the heade and cylinder # 4 is not fireing? any idea wht that means?

Check for spark on no4 plug...also check wether the plug is wet or dry when you remove it.
Dry and sparking means carb jets are blocked...
Wet and no spark means ht lead/plug cap or plug problem...change plug/unscrew cap from lead/cut a 1/4 inch off the lead and re-attatch.

May 24, 2012 | Suzuki Motorcycles

1 Answer

Number 1 cylinder has spark but not firing, I have gone through the carbs, and new plugs, I switched 1 and 2 plug wires and it did not help

Hummm, well to fire you need spark (at the correct time), compression, and fuel.
It sounds like you have spark, so do you have COMPRESSION? It needs to be similar to the other cylinders +/- 15% or so.

IF you have spark, and compression, try an external fuel source diagnostically, in the #1 cylinder. Spray some carb cleaner into that carb when unit is running.

Did you balance the carbs? Carb surgery often gets balance all out of spec.

Jun 24, 2011 | 1983 Suzuki GSX 1100 E

3 Answers

#1 plug is miss-firing.I have replaced plug and wire,but keeps miss-firing only on#1 plug.have been told that coolant is possibly getting in #1cylinder.also I have been told #1 coil could be bad.witch is...

Could only be a few things. The coil #1, Fuel injector #1, Stuck intake or exhaust valve, or blown head gasket allowing coolant into cylinder #1. Use a spark tester to check the spark coming out of cylindr #1 if checks good then ohm test the injector when it is warm. Check other injectors to compare. Do a compression test on cylinder #1 and test other cylinders to compare. If cylinder is low compression suspect valves and or head gasket. If compression is low then het a leak down tester to test if a valve is broke or sticking. On your sable i would suspect injector or coil most likely.

Oct 10, 2010 | 2000 Buick LeSabre

1 Answer

Not running on #3 cyl' on my 1982 gs550

Not likely valve timing if it will run, cams are one piece so if one is right all are right. Have you checked compression with a gauge, or just by feel? Try swapping the sparkplug wire with the #1 cylinder and see if the dead cylinder moves with the wire. Also try moving the spark plug to another cylinder and see if the dead cylinder moves with it. If the compression is indeed good, the problem will be with the spark plug/ wire, or in the carb, these are the only things that can kill a single cylinder. The coils run a pair of cylinders so a bad coil would put out 2 cylinders at the same time. Start with the spark plug, I have seen a perfectly good looking plug, that would fire whun held to the head, but would not fire in the cylinder.

Jun 04, 2010 | 1982 Suzuki Gs 550 L

1 Answer

My #1 and #2 cylinders are not firing. I have

Are the plugs sparking. Short them out to the engine while cranking engine to see spark at electrode. If they are not are you getting power to the coils. If they are sparking do they get wet when they are in place in the engine and it is run. Run it for a minute and remove plugs to check. If they are dry you may have a carb problem. If they are wet check the compression on the engine cylinders you may have blown the head gasket between no 1 and no 2 cylinders.

Feb 05, 2010 | 1991 Suzuki GSF 400 Bandit

2 Answers

Starts ok but only running on two cilinders

What have you done if anything to check out this problem?
Several causes could be: 1. Not getting fuel do to clogged jet in the carbs for those cylinders. 2. Fould plugs in those cylinders. 3. Not getting spark to those cylinders/bad coil 4. no compression in cylinders that don't fire.
So run the bike and determine which cylinders are not firing for sure. use a squirtgun and hit the header with some water. running cylinders with smoke the water. non running will not. Then remove and replace the plugs.(look at old ones, all oily=bad) See if they are wet and shiny but not black...Not shiny=no fuel. Tear carbs apart and clean. Check to see if you have spark leave spark plugs unintsalled from motor but installed in spark plug boot. see if they spark when you start it. Do a compression check. wet and dry. could be rings or valves.
If the bike was sitting for a while then probably clogged jets...This is where stabil comes in handy or else drain the bike at the end of the season.

Nov 28, 2009 | 1983 Suzuki Gs 550 L

1 Answer

Dead front cylinder

3 things to check 1 / check for fuel at cylinder is spark plug wet with fuel if so go to 2 . if not check carbs butterfly / jets etc ?.
2/ compression .. remove spark plug and fit compression tester should attain between 120 t0 150 psi or be in green for none numbered meters .. if not suspect valve seatings or cylinder head gasket ?. or compresion rings . if ok
2 check for spark at plug place plug in cap and place on side of engine turn over and look for good spark ( some plugs spark when out of cylinder but break down under preassure I am sumising you tried a new plug first ) if no spark check ignition /distributor cap and rotor arm clean and refit or replace . if all fails then can only suggest that you take to garage and have a tune test performed .. hope this helps.. Regards vortash

May 11, 2009 | Harley Davidson FLHX Street Glide...

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