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

Fuel wont get to carb on yamaha diversion


Hi, Anonymous always check fuel flow first to isolate the problem area otherwise the usual suspects are:
1. Fuel tank empty.
2. Fuel cap or fuel tank not venting properly.
3. Fuel filter clogged with rust or dirt.
4. Fuel valve/petcock not in the on or reserve position.
5. Vacuum line to fuel valve cracked, broken, pinched, or missing*
6. Fuel valve/petcock clogged or diaphragm cracked, cut or torn*
7. Fuel line from the fuel valve to the carburetor or fuel pump clogged, cracked, pinched, bent, broken, or missing.
8. Fuel pump not working*
9. Fuel line touching cylinder or head causing fuel to boil and vapor lock, repair by rerouting and wrapping line with convoluted tubing.
10. Carburetor inlet clogged.
11. Carburetor float or needle and seat stuck.
12. Carburetor not venting properly overflow line or bowl fitting clogged, pinched, or bent.
* If equipped or applicable.
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.
92 XJ600 Not Starting
Yamaha Diversion not starting again
Yamaha 2009 Diversion XJ6S Service Manual
OEM parts for Yamaha
Yamaha Diversion XJ600N Owner Manual

Feb 03, 2014 | 1995 Yamaha XJ 600 Diversion S-N

1 Answer

Wont firi over been sitting for a while


The following applies to pretty much any carbureted engine.
You need three things for an internal combustion engine: Fuel, Spark, and Air.
The first place I'd start is with the spark plug.
Remove the plug. With the plug wire attached to the plug, ground the electrode (threaded part) against the metal frame and crank the engine again. Check to see if there's a spark between the electrodes. If there is, then you've established spark - for that cylinder and only that cylinder. If you have spark in all cylinders, next thing I'd check is fuel.
I would start at the fuel inlet of the carb. Pull off the fuel line and make sure fuel can get there from the tank. If not, you have a plugged filter or debris in the tank that's preventing the fuel from reaching the carb. Clear the obstruction and try starting.
Still won't start? There is the possibility that gas in the carb has dried out. That can plug ports, keep the float from working, etc. Best fix is a carb cleanout.
On some bikes, you can check to see if the float is working. There is sometimes a drain valve in the sediment bowl (on the bottom of the carb). Open the drain and see if gas comes out. If it doesn't then there is no gas in the carb. If no gas comes out, then it's likely that your float is stuck.
If you don't have a drain valve, on some carbs, there is a "nut" on the bottom of the sediment bolt. It's actually a bolt that holds the sediment bowl to the carb. Loosen the bolt until your bowl is free to move. If no gas comes out between the bowl and the carb, your float is stuck. If it does come out, then it could be the needle that meters gas to your engine. Work the throttle a few times and then try again. With the gas in the bowl, working the throttle moves the needle in and out and can clear out enough "varnish" to let gas get into the cylinder.
Again, try starting it. Still no joy, pull the plug and see if it's wet. If it's wet, then it has been getting gas - too much, in fact, but that's because it hasn't been firing. You're back to two issues:
Either the needle isn't closing and too much gas is getting into the cylinder or you don't have spark. If it's the first, then you need to pull the carb for that cylinder, clean it out and re-install. If it's the second, you have an intermittent wiring problem which is going to be a lot of fun to find.

Dec 27, 2013 | 2008 kawasaki Vulcan 900 Classic

1 Answer

The motorcyle will run for a about 30 seconds and then starts cutting out by cylinders (4) and seems to be finally struggling on one cyclinder. I let it sit for a time and it will do it all over again but...


if you have disphram style carbs..(one carb for each cylinder) it may be a problem with the diaphrams at the top of the carbs. I t more likely sounds like sediment or rust in either the fuel screen in the tank or the caburetor bowls. The first thing I would try is remove the drain plugs at the bottom of all carb bowls and make sure that they all have good flow from them, do this one at a time and catch the fuel in a container so you can see if there is indeed foreign material in the fuel, if you get sediment, or rust, let the bowl run until you get good flow. if you cannot get flow from the carbs at all then remove the petcock from the tank and inspect the screen to see if it is clogged. if so, clean screen and flush the tank and carbs with clean fuel. hope this helps...

May 04, 2011 | Honda VF 750 C Magna Motorcycles

1 Answer

When i start the bike cold or hot i have black smoke from the exhaust pipes..choke on or off and cant get bike to idle..i turn off the petcock and after a few seconds the idle starts to come back to...


Black smoke indicates that your mixture is way too rich. Now, you didn't say what carb you're running, stock or aftermarket. But, what it sounds like to me is the needle and seat in the carb is leaking fuel and overfilling the float bowl. When you're running down the road, you'll using enough fuel so that the float bowl does not overfill. When idling, you don't use as much fuel, the bowl overfills, and fuel flows into the carb creating a very rich mixture. Is you overflow hose that connects to the bottom of the float bowl connected, clear and open? If so, turn the petcock on without the engine running. If the overflow is clear and the needle valve is leaking, you should see fuel start to flow out of the overflow hose. This is very important that it do this. If the overflow hose is blocked and you forget to turn your petcock off, you could wind up with a couple of gallons of fuel in your engine. It will leak out of the float bowl, into the carb past the intake valves, past the rings and into the engine. I've also seen it get into the primary drive case as well. I'd put a new needle in the carb and check the float setting according to the book. it's sets with the carb on an angle if the carb is the original Keihin CV.

Good Luck
Steve

Jan 29, 2011 | 2003 Harley Davidson FLSTFI Fat Boy

2 Answers

Honda CB250 will not start. It will turn over and there is fire on the plugs and when I look at the plugs after trying, they are "wet" with fuel. What am I missing?


Valve clearance or camshaft timing. If you have no clearance on the intake valves at top dead center, then you will have no compression = no start.

Nov 29, 2010 | 1994 Honda CB 250 Nighthawk

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

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

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

224 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4497 Answers

yadayada
yadayada

Level 3 Expert

63661 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...