Question about 1994 Honda CB 750 Nighthawk

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I let the bike sit with gas in tank. Now, carbs

I let the bike sit with gas in tank. Now, carbs are clogged. What's the best way to clean them out?

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You got to take them off the bike and dismantle them completely to clean them real well.

Posted on Oct 05, 2009

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1 Answer

Hit the gas and the engine almost dies. Idles and starts fine. Changed the spark plug - no change.


What kind of bike? It sounds like clogged carbs, if pilot jets are plugged from lack of service or sitting for a while then your bike could still start but will fall on its face when opening throttle due to lack of fuel, solution=clean your carbs thoroughly and flush your tank.

Jun 10, 2011 | Yamaha B50 Cross Junior Motorcycles

1 Answer

Will fire if I put gas in cyclinders but doesn't when I try normal proceadure. I'm thinking I have carb problem since the bike has been sitting idle for about 9 months. I drained gas and put in new and...


Generally if a bike has been sitting for quite a while it's good practise to remove the carbs and clean them thoroughly, and blast all passages out with compressed air. This is particularly important if the bike was left with fuel sitting in the carbs. It will evaporate out but most fuels have dyes in them and these dye particles can clog up emulsion holes within the carbs. Carb cleaner works best when the carbs are in pieces on the bench. It doesn't do much when they are on the bike as it's very limited as to the places it reaches.

Feb 22, 2011 | Honda CMX 250 Rebel Motorcycles

1 Answer

A week ago i took my bike to get fixed at a shop it had been sitting for about 2 years the guy said it was a dirty carb and a dirty gas tank he cleaned both and the bike ran fine i rode it for 2 min. or so...


Try replacing spark plug,and check for spark if you do good,check to see if you have fuel to carb,at bottom of carb there is a float bowl screw loosen the screw and let fuel drain,tighten screw,choke and try again,sometimes when bike sits that long it may need one or two cleans,the bad gas that was in it still has varnash build up and can still clog up the jets.hope this helps.

Feb 17, 2011 | Suzuki RM 125 Motorcycles

1 Answer

Bike sits a lot,Hard to start, will only continue to run with choke on. Bike backfires alot.


You need to clean your carburetors. The ethanol that is in gasoline turns to an orange colored film
and it clogs the jets. The prevention for this seems to be seafoam added to your gasoline after your carbs are clean.
It does work. If your bike sits a lot, i would also suggest that you start it up weekly and let it warm up. Sitting is the worse thing for gasoline.
Judging from your description and other problems, the backfire is probably bad gas not burning and igniting in the cylinder when overloaded with gas.
A good carb cleaning, consists of taking the carbs off the bike, taking out all the jets and soaking everything in a good carb solution.
I would start with the carb cleaning, drain the old gas out of the tank, start with fresh 93 octane and add the recommended dose of seafoam listed on the back of the botlle to your gasoline.
Put a set of new spark plugs in it, and fire it up.
Your back fire should be gone as well.

Nov 29, 2010 | 2004 Yamaha V Star 1100 Classic

1 Answer

I think my carb is gummed up or the jets are plugged. whats the best way to clean this without removing the entire carb or is there no easy way


The only way to properly clean is to remove and disassemble. However if you are just a victim of bad gas, a shot of carb cleaner down the fuel line will remove fuel that has gelled in the jet. Know if the clog is more serious, drain the carb bowl, and fuel tank. Pour some Chevron "TECRON" directly into the carb, mix a Shock Treatment ( about a third of cup in one gallon of gas)and put in tank. Start the bike just enough to **** into jets, and let sit overnight.Drain the carb bowls and restart the bike. let it idle or drive it slowly for five minutes. this will usually take care of minor clogs.When bike is idling or running better drive to gas station and fill the tank. Drive the shock treatment through the bike(100 plus miles), this should clean up the entire engine. If the techron does not clean the carbs in 5 to 10 minutes of running time, you will have to take them apart to clean them properly. Use Chevron "Techron" not Chevron "Fuel sytem cleaner with Techron". Techron is more concentrated.

Jul 15, 2010 | 2001 Honda VT 750 CD Shadow A.C.E. Deluxe

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

Only stays running on choke, sounds a bit rough, new plugs


Gas these days ****, and standing gas sucks even more. Drain your carbs and flush out your fuel tank. good luck

Jul 06, 2009 | 2002 Honda VT 750 DC Shadow Spirit

3 Answers

Clog carb


better to strip the carbs and make sure the pilot jets are clear, i dont like using 'cleaners' in the tank.

Jun 16, 2009 | 2003 Yamaha YZF 600 R thunder cat

2 Answers

Will only run with full choke and absolutely no throttle.


Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.

Use a couple of cans of Sea Foam.. best stuff in the world.

Mar 20, 2009 | Honda XR 200 Motorcycles

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