Question about Honda CB 750 Nighthawk Motorcycles

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New battery installed. unfortunely I let it sit over the winter (covered)and didn't drain gas. Bike will not start, all lights come on and it seems that there is no gas getting to the carburetor. Is there any suggestions?? Thanks, Bob

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Pull your carbs and clean then, most important, pull your jets and run a wire from a wire brush them. Ethanol from the gas most likely has clogged them.

Posted on Mar 20, 2011

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Siren works, but no power to instrument after recharging battery. Nothing changed on the bike, was just sitting all winter.


There should be a small fuse box near the battery with probably three fuses inside. Have you checked those?

Mar 15, 2014 | Harley Davidson Motorcycles

1 Answer

Bike running rough at lower revs


If the bike sat without being used over the winter It could be bad gas. if gas sits without being used for an extended period of time it destabilizes and gums up carborators and fuel injectors, you need to add a fuel stabilizer to gas when storing for winter. To fix the problem the gas has to be drained from tank, then refil with fresh gas and appropriate amount of carborator/fuel injector cleaner/treatment. Then start the bike and let it run it should clean itself out and start running smooth. If bike did not sit unused for winter its possible they installed the wrong plugs sometimes they talk you into spending more money on platinum or split fire/gimmick plugs (always use the exact same plug that came in the bike when it was new!!!!!)

Mar 17, 2012 | Triumph Rocket III Touring Motorcycles

1 Answer

Me bike starts and then stalls


Sounds like a fuel problem. Plugged filter possibly, or bad gas that has been sitting all winter. Try to drain the tank and put new gas in.

Feb 28, 2011 | 2003 Harley Davidson FLSTFI Fat Boy

1 Answer

So i just tried to start my bike yesterday after its been sitting for awhile and it just barely started and then died, but after that i tried starting it again and i have no power to anything on my bike...


motorcycle batteries do not last very long -- and they store even worse. I would try and jump start the bike with the battery installed and see if you can get it to turn over. if it will not start ( crank ),, check the main fuse and make sure it did not blow. as for the ' barely started and died ' -- I would check to make sure that there is no water from condensation in the gas tank which is now in your carbs, drain the carbs and add some gas additive ( water eater ) to the tank and see if that helps.
also if the bike has been sitting for a long time there is a chance that the gas is now bad and will not fire right, ( when in doubt I always drain everything and start fresh ).

c...

Dec 31, 2010 | 1997 Suzuki GSX-R 600

1 Answer

2003 Fatboy while winterizing drained the oil very little came out however there was oil in filter..New filter,filled with oil started sounds like usual then the oil shot out of the cap where you insert...


On the softail model Harley Davidson's the oil tank is external and sits up higher than the engine crank case and oil pump. when these bikes sit for an amount of time the oil gravitates from the tank to the crank case. starting may seem sightly harder and seem like the battery is going dead. the bike should be started in knowing that you had oil in it to start with and no giant leak puddle underneath of it. warm up the engine and then drain the oil out of the tank. the reason why your filler cap popped off is because you had probably 2 1/2 to 3 quarts to much engine oil in the bike. so drain the oil from the tank at the drain pug at the bottom of the hose on the high (right side ) of the bike where the swing arm meets the frame (it is a 5/8 socket) put the drain plug back in run the bike for about 5 minutes inspecting with a flashlight continuously that oil is circulating back into the tank. then dran it again and replace with new oil.

Dec 10, 2010 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

What kind of maintenance should i do to my 1989 cbr 600 f to keep it in tip top running condition


  • Change gearbox oil every 3000 miles. Change oil filter every 6000 miles. Use 10w40 motor oil. NEVER use synthetic lubricants as they can mess up the clutch.
  • Oil the chain every two weeks. Lube the control cables every oil filter change.
  • Keep the gas tank full in the cold months. This lessens internal tank rusting due to condensation in the tank. Drain the carbs when the bike will sit over the winter unless you plan on starting the bike every two weeks and letting it run for 15 minutes each time.
  • Be sure the gas valve is turned off when the bike is not in use.
  • Get a 2 amp trickle charger and charge the battery once a week for 4 hours in the winter. Be sure to keep enough water in the battery to cover the top of the plates in each cell. Know that batteries only last two years or so.
  • Check the chain tension once a month during the summer riding season.
  • Please rate my answer. Thanks.

Sep 11, 2010 | 1989 Honda CBR 600 F Hurricane

2 Answers

Will not idle


Your carbs are dirty and need to be cleaned. A tank of bad gas or old gas can gel up the jets. You buy gas, drive home, and when you get there the bike stops idling. Light gelling can be fixed by draining the carbs (screw on bottom of bowl), pulling the fuel line off the tank, and squirting some motorcycle carburetor cleaner down the fuel line. Plug the fuel line back in turn on the gas and start up the bike. If that doesn't work, using the same procedure buy some Chevron Techron fuels system cleaner, pour directly into the carbs and let sit over night (also drain tank and heavily treat one gallon of gas and put in tank) Fire up bike and let run ,idle, slow drive for 5 to ten minutes. This will usually get cycle idling without disassembling carbs. If it still wont idle you will have to take off the carbs, disassemble and clean blowing through the jets and jet passageways.

May 08, 2010 | 2005 Honda VT 600 C Shadow

2 Answers

Yamaha V-Star 1100 Custom stalls when downshifting


sounds more like a fuel problem to me. is it cold there did you use stabilizer in the gas? try some berrymans B12 in the gas it cleans everything up internally. it worked for me

Mar 18, 2009 | 2001 Yamaha V Star 1100 Classic

2 Answers

Won't start after winter


Big explosion was probably from a large amount of gas that ran into the exhaust system and then ignited when you started the bike again. There probably is gunk from sitting in the carb. If you can't find them, then you probably should not disassemble them by yourself. It should not cost to much for a dealer to clean it for you.

Mar 02, 2009 | 2002 Honda VT 125 Shadow

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Hi, I bought the Stunner CBF bike 4 years ago. It Hi, I bought the Stunner CBF bike 4 years ago. It was fine up to 40,000 kms. And after 40,000 kms its starts to smoking. So i replaced the ring and piston with original parts but it didn't work well and still smoking and again the technician open the bike and they said that it is the piston problem and they said that it should be replaced but not with the original parts and they replaced the ring and piston with 50mm size of Mahal brand. I have replaced all the parts like ring, piston, valve and other supporting parts but still my bike smoking when i accelerate above 60km/h. When i ride bikes in hilly areas with my friends behind then pick up is very less and its bikes smokes blue. My silencer gets wet and when the bike cool down then the silencer gets dry. When i check the engine oil it is fine up to mark of the leveler. So i am confuse what is the problem. For 8 to 10 times i used Sarvo, Enoc and Zic engine oil. Now i am using Honda engine oil in a gray bottle pack. The technician said that the parts of honda is not good enough as before. These are all made in china so that the problem occurs. So that they replace the Mahal brand ring and piston. Now my bikes traveled nearly 50,000 kms (49,800 kms). And one thing i didn't give my bike to the showroom for the replacement of ring and piston. I gave it to the reputed technician in town. I think this time i will get proper answer for my problem. Thanks

Oct 22, 2013 | 2011 Honda CBF Stunner

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