Question about 2001 Honda Cb 400 Super Four

1 Answer

Wont start After sucking on the vacuum tube, fuel spurts out of carb intake hose, tanks free from debree and carbs pour fuel from sediment bowl, good charge battery, ****** still wont start, was running fine three days ago, hasn,t moved an inch, the down tube from the petcock in which I believe is the vacuum tube goes down into the engine casing, to where???? and where is the vacuum created ?, tried putting an inline filter in to see if fuels getting through to the carbs, and yes its pointing the right way round and yep the fuel was straight there, started straight away and ran sweet as a nut, but now there's now't and I havn"t got a clue, please help x

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Novelist:

    An expert who has written 50 answers of more than 400 characters.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 126 Answers

3 things are needed for combustion (compression, fuel/air mixture & spark). if fuel is making it to the carb and out the drain tube, then it might not be a fuel issue. i'd turn to spark and see if that fixes it. it has for me on dirt bikes and ATVs. one minute it was running, shut it down for a break and when trying to restart, nothing. changed out the spark plugs and viola'....she's alive again. never had luck with NGK plugs.

worth looking at the air filter too. make sure you can still see light through it when holding it up to a light. and you should feel/hear a suction while trying to start it which means the passage to the carbs are clear.

try this. petcock on try and start it. try for a few seconds (<10 sec) to give a start. stop cranking and immediately pull out the plugs. are they wet? if they are, then fuel is making it to the cylinder.

take a look at the plug. is it black (like its running too rich?) or is it very white like a new plug (lean condition)? should look like light brown toast if its running right. throw in a few new plugs and give it a try no matter how they look to see if this works.

Posted on Jan 15, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

After engine is started fuel flows out of carb vent tube


Hi, Lou and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
Carburetor is leaking gas out of overflow tube need help
http://www.instructables.com/answers/What-is-wrong-with-my-carburetor
gas pouring out of bowl vent hole and overflow tube on super Harley...
RM125 Carb keeps running fuel out overflow
Concours Owners GroupTM Sport touring at its finest SM

Dec 12, 2016 | Motorcycles

1 Answer

Why is fuel in vent tubes on my carbs


Hi, Rick and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have nice a day.
http://www.thegsresources.com/_forum/showthread.php?94636-Leaking-Gas-from-Carb-Vent-Hose
My bike started pouring gasoline out of the carbs just now
Motorcycle Carburetor Cleaning and Rebuild part 1

Feb 26, 2016 | Motorcycles

1 Answer

I put a new carb on my riding mower.it is hard to start.when it runs fuel pours out the top.also engine wont run with air cleaner installed on it.


The carb needle is not sealing properly on its seat, as this is a new carb it may be due to dirty fuel,clamp the fuel hose, remove the float bowl and clean out, check for any dirt particules, with the bowl off partly un clamp the fuel hose, fuel should flow freely and help to clear any dirt from the needle seat, re clamp the hose and refit the float bowl, if there was dirty fuel in the bowl you need to drain the tank and re fill with fresh clean fuel, if it still leaks you may need to replace the needle, or return the new carb to where you purchased it from.

Apr 01, 2013 | Garden

2 Answers

The tecumseh engine on my snowblower runs for 5 minutes max. then shuts down.how can i fix this?


Hi and welcome to FixYa, I am Kelly. I have been working on small engines for over 40 years and this sounds like possibly a fuel starvation problem. Since you did not include an engine model or engine number & size, ths response is quite generic. Remove the float bowl and clean the bowl nut holes. Also with the bowl removed the fuel flow should fill a spary paint can lid 2/3 rds full in about 8 seconds. If you do not have this king of fuel flow then the problems can be:
1. A clogged fuel filter (If installed)
2. A glass fuel bowl on the bottom of the fuel tank or in line with the main fuel supply that is full of sediment.
3. An obstruction in the fuel tank outlet port (rust / debris, grass et al)

While the feul bowl is off remove the main fuel supply hose from the carb and check fuel flow. After you are sure you have a good fuel supply re-install the main fuel hose to the carb AFTER shooting carb cleaner into the fuel manifold connection. Also use carb cleaner and spray into the threaded area where the bowl nut screws into the bast of the carb. This is where the main fuel jet is located. You can use a small nail or tooth pick to clear any obstructions in the jet orifice above the threads of the bowl nut. Also spray carb cleaner into the brass tube in the bottom of throat of the carb (goes to jet orifice)

If you are having ignition failure that is heat or vibration related you will have to find out where the ignition kill wire is chaffing on the engine. If can be anywhere from the throttle control to under the flywheel. You just have to follow the wire from the kill switch point all the way to the ignition coil searching for a bare spot. An tidy electrical tape repair of a chaffed wire is ok. On some snow blowers I have had to cut the wire.. install a piece of shrink tubing, solder the 2 wires together and then skrink the tubing over the repair due to water intrusion from snow.

Sometimes... it is possible for a spark plug to fail as it gets hot. A new plug sould solve this problem. Also check where the spark plug wire passes through the air shroud for any signs of insulation break down.

If you need more help or have any comments just repsond here and I will gladly help you.

Thanks for choosing FixYa,
Kelly

Oct 29, 2010 | Vacuums

1 Answer

How do i get it out to put new one in


find the offending carb or carbs by pulling float bowl over flow hoses to the side and starting motor, 1 or move hose will be pouring fuel, follow hose to offending carb, unmount all 4 carbs from motor,(unmount tank,1 bolt 2 hoses,2 wires) then (unscew hose clamps from front and back of carbs) next(reomove scew from very top font of air box,near metal cross bar behind fuel tank) then wiggle carbs to separate from rubber intakes,unhook trhottle cables pull carbs out one side(either side of bike) once off turn upside down,take 4 bowl screws out ,remove cover,take out small pin holding floats ,needle will come with it,use the right wrench and uscrew brass seat needle came out of(make sure any rubber o ring come with) reinstall seat &any orings take old needle off float install new one,put needle in hole of seat,pin float put cover back on bottom of carb,re assemble bike.I hope you've maked where everything goes,a little oilon rubber helps with reassembly .













)

Jul 17, 2010 | 1981 Suzuki GS 750 L

1 Answer

3.5 hp b/s edger motor replaced gas tank gasket, and carb diaphragm. will start and run if I pour gas in carb.. wont **** from tank


if this is a vertical crankshaft 3.5 then you may have the gasket and diaphragm inverted, the diaphragm must be against the tank, and the gasket against the carb for the fuel pump to work, also check the pickup tube screen for being plugged, water in the tank bowl or a film or varnish or oxidation on the main jet sock.

If this is a horizontal shaft, like a go-kart, all the stuff about plugged pickups and main nozzles applies, only big difference is if there was a lot of corrosion in the bowl under the carb, the main jet could be permanently plugged, also there should be a removable jet on the control lever side of the carb that will probably need cleaning as well, also when removing the carb from the tank make note of any fuel in the bowl, if there isn't any, make sure the pickup tube isn't plugged or split, the diaphragm spring is installed, and the bowl doesn't have a hole rotted through it.

May 30, 2010 | Garden

1 Answer

Gas Lawnmower start and then shuts off....


Ok here are 2 possible solutions.
1. If you have a mower with a sediment bowl under the carb and flat paper air filter, try this. Drain gas from gas tank. Remove the screw that holds the air filter cover. Replace air filter is dirty. Remove the two or three screws that are holding the flat plastic back of air filter cover. Remove the little gasket that is between the flat plastic back and sediment bowl. Make sure you remove all of old gasket. Clean the area around the sediment bowl so it is free of dirt and grim. Use a 1/2 socket (usually) and remove the bolt on underside of the bulb. The remaining gas in the bowl and a little left in the tank will leak out. I let it all run out so if any water is in tank it emptys on its own. Remove the bowl and clean it out with clean rag or paper towel. Use some carb and choke cleaner to spray the carb. Reattach the bowl, and tighten the bolt making sure the ruber gasket between the bowl and carb is not twisted or you will have leaks. Install a new gasket between carb and air filter back replace 2 or 3 screws and air filter and cover. Refill with gas, prime it and then try and start it.

2. If your carb is located ontop of the fuel tank, remove the cross tip screws that hold carb to tank and get a new diaphram (fuel pump in a sense). Replace diaphram and reassemble in reverse. You will have to also remove the bolt that holds tank to motor and the little metal rod that goes from the govonor to the choke.

From what you stated I would think it is number 1.

Good luck. Let me know if this helps.

roundo4

Aug 14, 2009 | Craftsman Garden

1 Answer

84 gsx750se starting problem!


Hi and welcome to FixYa,

PRI setting allows fuel to flow from the tank to the carbs whether engine is running or not while ON requires that there is vacuum (engine running) for the fuel cut-off valve to allow fuel to flow (safety feature).

To determine if fuel is reaching the carbs, loosen the drain screw at the bottom of the carb's bowl. Fuel should leak out of the drain hose. For safety reasons, ensure no open flame and the fuel is collected in a suitable container. Another that could be tried is to turn off fuel from tank, temporarily remove the drain hoses from each of the carbs and spray the inside of the bowl through the drain hose nipple using carb cleaner. It would be easier to use the narrow tubelike nozzle that comes with the carb cleaner.

Good luck and thank you for using FixYa.

May 30, 2009 | 1990 Suzuki GSX-R 750 L

3 Answers

2000 Buell Blast will not turn over


You have fuel in the tank, but is the float bowl full? Loosen the bowl drain, see if ya got gas. All the new bikes have vacuum operated fuel petcocks, and it takes forever in the spring to crank em long enough to fill the bowl. Take the line off the petcock, fill it with a small funnel with fuel, then put it back on, and fire it up.

Apr 10, 2009 | 2000 Buell Blast

1 Answer

Briggs & Stratton engine on Murray lawn mower running rough. Changed spark plug, cleaned filter, drained fuel tank and line. Still running rough. What to do next?


I always replace the air filter if its a paper element, and even if its a foam element I replace it rather than clean it. That said, engine stumbling is rarely and air flow problem - but it could be, so having a new filter assures no air restrictions.

I would drop the carbuerator bowl. On the bottom of the carb, near where the fuel line comes into the engine, should be a nut. Removing this nut allows the bowl to drop off the carb. Some engines the bowl screws off, you will have to look at the bowl. Often the bowl has sediment or sludge buildup inside. Cleaning the bottom of the bowl can prevent that sludge/sediment from plugging the intake tube. Even on newer mower models this is a common problem, the gas line tubing interior breaks down and the inside of the tubing can start degrading - ending up in the bowl as sludge.

After cleaning the bowl, I would add one ounce of fuel line cleaner to a full tank of fuel and run the entire tank of fuel. This will clean any deposits or "varnish" from the interior carb parts. Doing this and the first step will assure your carb is clean and functioning.

If that doesn't help, then I would look at the spacing between the magneto and coil assembly. If you want to do that I'd like you to write down all the model numbers and serial numbers on the engine nameplate, that way I can give you specific directions.

Hope this helps,
Gregg

Mar 29, 2009 | Garden

Not finding what you are looking for?
2001 Honda Cb 400 Super Four Logo

226 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4514 Answers

yadayada
yadayada

Level 3 Expert

70387 Answers

Gino Cussen
Gino Cussen

Level 2 Expert

216 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...