Question about 1984 Honda CB 700 SC Nighthawk

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The bike will not run good unless the choke is on. cleaned the carbs and everything look good.

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It's running lean.Soak your jets in Sea Foam for a couple hours and check your intake boots for cracks/leaks.

Posted on Oct 14, 2010

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1 Answer

Engine stalls out when shutting off the choke


Hey Bill, ...........My crystal ball is working fine..
Sounds like you need a professional carb cleaning and setting.. when a bike won't run unless the choke is on, its either the carbs need cleaning, or you have developed an air leak.. if the bike has been sitting for a length of time..its the carbs...once you get the carbs cleaned and set...you should be fine.. if it does nor correct the issue..please reply to me on here... thanks.. please rate as helpful...

Jul 14, 2017 | Motorcycles

1 Answer

Not getting any power unless choke is on


Only running good with the choke on is an indicator that the bike is normally running too lean. The fact that it runs good with the choke on at least tells me it is getting fuel to the carb(s). Therefore it seems probable that there is clogging in the carburetor jets or there is a big air leak between the engine and carb(s).

Sep 06, 2013 | 2003 Yamaha V Star 1100 Custom

1 Answer

Carb on big bear 350 quad was plugged from sitting ,took apart and cleaned ,bike won,t idle unless choke is out a bit ,but if you push choke in and keep reved up will run ,also backfires when letting off...


it is a garantee that the main jet is stoped up with that grayish dried gas minerals..this not in the main jet valve you can remove,but actually in the bore on the carb body... you can try to use torch tip cleaner to open the hole ...hope you the best ....it is a very hard substance...someone tried starting the bike after being set up for a while without removing carb and cleaning first.....sincerely;R.B.V.

May 18, 2013 | Motorcycles

2 Answers

After my bike warms up good it gets real sluggish. It takes about 15 minutes for this to occur. When it happens I have to rev the bike real high or it will die out like its not getting or getting to much...


You didn't say what year or model your bike was but if it runs better when it's cold than it does when it's hot, this is an indication that it's running rich. Does the bike start up and idle without the use of the choke or very little use of the choke? If so, another indication that it's rich. Take the air filter cover and element off, leave the backing plate on, and take the bike for a ride. If it runs better, yet another indicator that it's running too rich. What type of carb is on the bike? This is unusual as most bikes,unless they've been rejetted, are jetted lean and have a nasty habit of spitting back from the carb.

Steve

Aug 08, 2011 | Harley Davidson XL 1200 L Sporster Low...

1 Answer

Carborator only lets it run when choke is on


The slow circuit of your carburetors is dirty or plugged. Take the carbs apart and squirt carb cleaner through the slow jets and the carb bodies. Count the turns in on your air screws, pull them and squirt cleaner through those passage ways too. Be sure to carefully remove, clean and inspect the carb tops too.When everything is clean and in good shape the bike should run great.

Aug 17, 2010 | 1981 Yamaha XS 400 Special

1 Answer

Just bought a 99 wide glide, rode it home last night and it was sputtering pretty bad after about 150 miles and it would die at low rpms and make a sucking or hissing noise. Only has 13,000 miles on it. It...


It sounds like a carburetor problem it won't run without the choke on. The bike has probably been sitting up for a good while. I'd be willing to bet that the jets in the carb are stopped up. When gasoline evaporates in the carb, it leaves behind a gummy mess that will stop up the jets. This is probably what is wrong with your bike. The carb needs to be completely disassembled and cleaned. Unless you're experienced in doing such a job, it's one that is best left to the pros.

Good Luck
Steve

Jul 16, 2010 | 2000 Harley Davidson FXDWG Dyna Wide Glide

1 Answer

Won't idle without choke, turn throttle boggs out


have u checked the float hight on the carburator? also make sure ur choke curcuit i clean and free of dirt

Apr 13, 2010 | 2005 kawasaki KLX 125

1 Answer

Bike wont idle unless the choke is on.


Try cleaning pilot jets on carb or carbs. Also check for vaccume leaks like hose off of carb or bad carb boots.Spray carb cleaner around boots with bike running but be careful not to get it near exhaust or spark plug.

Dec 26, 2009 | 2000 Suzuki GSX-R 600

1 Answer

I had a high performance pipe on my bike, it got damaged, put stock pipe back on and it ran fine for a couple of months, it started to backfire at idle and with throttle off but still had plenty of power. ...


I would take a close look at the valves, if you are sure the carb is entirely clean. (Accelerator pump and everything)
A closed up exhaust can harm an exhaust valve.
Start with a compression test.
Good spark?
Is the plug wet?

Nov 24, 2009 | Yamaha YZ 250 F Motorcycles

2 Answers

Bike sat for awhile, runs but doesnt idle very good. cuts out


I would remove and clean the sparkplugs - sounds like one may be fouled.

Aug 18, 2009 | 1994 Yamaha FZR 600

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