Question about 1998 Honda CBR 900 RR Fireblade

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Gas is pumpin through the petcock through the line but won't start can pour gas in carbs and fires right up can anyone help?????

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If you have fuel going to the carb, it would suggest that the fuel is not passing through it into the cylinder for the spark plug to ignite. Would suggest stripping and cleaning the carbs. Also check the rubber boots if they are CV carbs and check that the vaccum pipes are fitted correctly.

Posted on Feb 22, 2010


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What should I check next? Not getting any error codes, replaced the CKP, MAP, IAC, TP, & ET Sensors. Not sure what I should try next, any suggestions would be appreciated.

Hi Bruce, might have gotten some bad gas. Drain the tank, clean the fuel filter, check the bottom of tank for rust, dirt, water ect. Then ckeck fuel pump pressure, refill tank with a gallon of fresh gas from a different source and take it for a ride. good luck

Btw, I’m available to help over the phone in case u need at

Mar 28, 2015 | 2006 Harley Davidson FLHRS Road King...

1 Answer

04 Harley xL883C Won't start after replacing petcock

Your comment about it running only as long as you're spraying carb cleaner into it tells me that the gas isn't getting to the carb.

Pull the fuel line off at the carb, turn on the petcock, and see if gas flows (use a cup to catch the gas).

If no gas flow, you'll know the problem is somewhere between the ga tank and the carb.

Plugged inline fuel filter?
Plugged fuel line?
Bad petcock?

Mar 13, 2014 | 2004 Harley Davidson XL 883C Sportster...

1 Answer

Hooking up the gas tank the gas line to petcox the vac line to petcox what is the other line what do it go to this is on a 1982 gs650 suziki

The other line goes to the fuel gauge overflow right next to the petcock vacuum line on the tank. Big nipple on petcock goes to fuel line leading between carb 2 and 3. Small nipple on petcock goes to the brass nipple on the front of carb number 2. The other hose hooks up to the nipple coming from the fuel sending unit and routes down below the battery and ends. It's there in case the fuel sending unit leaks the hose will route the gasoline away from a hot engine instead of pouring out right on top of it. The nipple to the fuel sending unit should be positioned pointing directly at the petcock on the bottom of the tank. In case you don't know what I mean by sending unit it's the big round circle on the left side of the bottom of the tank with 2 wires coming from it.

Jan 29, 2014 | 1982 Suzuki GS 650 GT

1 Answer

Hard to start, no fuel to carb

If you take the fuel line off at the carb and crank the engine, does the pump push fuel out of the line ?

Apr 11, 2013 | 1984 Ford F 150

1 Answer

I have a 1998 suzuki marauder and it will turn over and fire with starter fluid, but it won't even try without it. There's gas in the lines going to the carbs but I can't figure out why it...

has the bike sat for any length of time? If so, the carbs need cleaned. Regardless of what you put in the tank, they'll need to be removed and cleaned. Since the bike is 14 years old, I'd guess they're due.

Also, check the petcock and tank for rust.


Oct 18, 2012 | Motorcycles

1 Answer

I have a 1986 suzuki 650 savage the carb seems to have a problem. It started flooding gas coming out the over flow. I took it off and took the float cover off and replaced the needle needle set and float....

Yea these carbs can be a real pain sometimes to get right. First thing you need to do is varify the float seat is working and totally stopping all fuel flow.... and all the jets, main, pilot and choke circuit are absolutely clean. Bench test the float needle valve by connecting a hose to the carb fuel line nipple and letting gas gravity feed as it would in a run position. if it tests ok, remount it on the bike...
i'm guessing you have a vacuum petcock on this year model? If you do, it needs to be inspected.
In the "on" position you should have no gas flow coming through the petcock, In the "prime" position it free flows. If there is a hole in the diaphram the engine will **** gas and not air (vacuum) through the hose and it will flood. If you don't have a vacuum line on your petcock then it is a different kind. Be sure to check your crankcase, it could be way past full with gas that has entered, dont start your engine like that...drain it all out. make sure the air filter is dry. You will have to replace the spark plugs...a gas soaked plug won't fire.
Good luck, i hope this helps.

Jul 16, 2011 | 1986 Suzuki LS 650 Savage

1 Answer

I've adjusted the float and checked the needle seat [found gas in my oil ] but will not start-checked for spark thinking that it has jumped timing how do I check timing? also what about vaccume on...

The timing on your bike is set automatically by the computer and cannot "jump", not even on the older models. There is a crankshaft position sensor on the left front of the engine case that senses the position of the crank. Since your bike is equipped with a carburetor, it has a fuel petcock. This petcock is operated by manifold vacuum. The vacuum line connects to the backside of the carb. Make sure it is connected at the carb and to the backside of the petcock. To check the petcock, you must have a hand operated vacuum pump. Disconnect the fuel line, connect the vacuum pump to the vacuum nipple on the backside of the petcock and apply vacuum. Fuel should run out of the fuel line. If not, you need to replace the diaphragm in the petcock. Personally, I'd replace the petcock with a high quality manual petcock like a Pingel. You'll have to turn your fuel on and off manually, old school but it won't give you any more trouble.

You can take an oil squirt can and put some fuel in it. Remove the air filter and squirt a couple of shots of fuel in the mouth of the carb. Try to start the engine. If it starts or fires a couple of times, then you know the spark is fine. If you get the engine to run long enough, it will allow the carb to fill with fuel and it may run on it's own then.

May 09, 2011 | 2006 Harley Davidson FXDLI Dyna Low Rider

1 Answer

It cranks good...idles good...will not take gas...i cleaned the carbs...and put new plugs acts like the right cylinder is not firing's exhaust is almost cold ...the right cylinder...

cylinder head is getting red hot because it's running lean. Check to see if there is an aftermarket fuel filter in the fuel line somewhere, also the float hight in the carbs are set right. Also drain the fuel tank and apply fresh fuel. Check to see if the tank is rusted, also if it has a device at the bottom of the gas tank that turns on and shuts off the fuel (petcock) it's possible it has a fuel flilter in there as well.

*Note if you take the petcock off you will more than likely have to replace agasket for it. Given the age of the bike it will be hard to find a gasket.

Jan 03, 2011 | 1977 Honda Cb 400 F

1 Answer

My 2005 yamaha TTR 125 will not let gas flow into the carb bowl, you can pour gas into it and it starts right up, thanks!

Your float in the bottom of the carb is likely stuck in the up position. The float attaches to a valve that shuts off fuel flow when level is just right. Can you see the little screw at the bottom of the bowl? Do you see the little overflow hose below that? Get a plastic soda bottle, put the outlet of the tiny hose into it. unscrew that little screw a few turns. Do you see fuel coming out? No? then take the back end of a screw driver and tap the bowl of your carb sharply 5 or 6 times. (Make sure the fuel pet **** under the tank is turned on. If you do not see fuel going into your bottle in a minute, shut off fuel at the tank. Screw the bowl drain back in. Remove the larger incoming fuel line that goes from tank to carb and put it into the bottle. Now you will open the petcock a little bit slowly. If you never see fuel come out of the tank, thru that hose, then your screens on the petcock may be clogged. Shut off fuel , Remove the cap on your fuel tank. blow into the line while slowly opening the petcock valve. Hear air bubbling in the tank yet? If you do, shut off valve, remove air pressure from line, point it back into the bottle and reopen the valve. If none of this works, then you need a new petcock valve.

Nov 29, 2010 | 2004 Yamaha TT-R 125 L

1 Answer

93 Suzuki Katana GSX 600 fuel issues?

You need to check and see if you are getting fuel from the tank into your carbs, if you pull the line that feeds the petcock valve off the top gas should come out. If it doesnt there is a clog in your tank. Now pull the line off the bottom of the petcock valve (this feeds your carbs) and make sure you have fuel at all setting of the petcock valve except for off. If you dont then you probably have a bad petcock valve. If you are getting fuel from the petcock vavle into you carbs then there is a problem with your carbs.

If you take the fuel bowl drain screw out of the carb (located on the bottom). Gas should run out of the associated carb, if it doesn't, then you have something stuck in the carb and one carb not working correctly can make the bike not run. If you find this to be the problem get a can of carb cleaner, take the fuel bowl drain screw out and let the gas run out, stick the red spray wand from the can of cleaner into the hole and flush your carbs out really good.

Then give it a try. Make sure that the connection between your carbs and head is tight while you are there. If that does not fix your problem you may ahve to pull the carbs and take a closer look.

Apr 08, 2010 | 1993 Suzuki GSX 600 F (Katana)

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