Question about 2003 Suzuki DR-Z 400

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Carby settings. The screw jet at the back of the carby on the bottem of bole,how many turns it be from fully seated many thanks steve.

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The screw setting depends on the engine and carb condition,but you can usually start off with the screw turned out about 1 1/2 (one and one half) turns out and adjust it to obtain the best running setting from there.

Posted on Mar 21, 2011

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Cranks only runs with full choke at idle


Sounds like main jet is blocked or the float seat is jammed or stuck this can happen for two main reasons
1)leaving fuel for extended periods eg winter break 2) water in fuel
Exploded diagram of carbie will help. Normally you would remove fuel bowl from bottom of carbie this is either clipped or screw in center of bowl . the gasket can hold bowl in position a gentle tap gets it off. the jet is normally screwed in to the same piece of casting as the screw for the bowl and is removed by a slot head screwdriver Note when sticking screwdriver up hole make sure it is small enough so it does not damage thread inside casting remove jet and clean with a fine wire or a jet cleaner.( they can be bought from a camping supply store ) then screw back in.
The float is held in by a loose pin, when the bowl is off the pin can be removed, the float will fall off and so will the seat so be careful. the seat is small and is loosely attached to the float but will not stay connected to it.clean the seat and reassemble. Best to be done by removing carbie and placing on clean bench.Only some times can it be done in position. PS this is the same for most small engine. If you turn fuel off and run engine dry as apposed to turning off the ignition for long breaks this problem will tend not to happen

Oct 25, 2013 | Craftsman YT 3000 42" Kohler 22 hp Gas...

1 Answer

Honda mower HRU173PU carby screws adjustment


Hi Paul
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud

Oct 27, 2012 | Honda Garden

1 Answer

Idle adj screw vibrates out and the idle speed is high.


Hi Charles Gregory.

When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their original position before you started.
Make sure your spring that goes on the idle screw is in place.
You can also use some "locktite" thread locking compound on the threads of the needle if the spring is missing.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Please take time to rate me
Bud

Oct 01, 2012 | Garden

1 Answer

Only runs with full choke, I bought the bike last week and the float needle was stuck and I think it had bad gas. so I changed the gas, cleaned the carb, reset the float needle. I also set the main slide...


Hi mate reverse the needle clip position back to factory setting this issue is pilot circuit for sure - If you have cleaned carbi you need to replace or clean the pilot jet and compress air clean the hole where the pilot jet came out of to clear the circuit. Running only with choke on is classic symptom of block pilot circuit...
Also check you fuel air mix screw this may have been altered trying to correct this issue it should be 1.5 - 2.5 turns out from fully closed..
all the change of needle position clip is doing is allowing your bike to run off the main jet (not good)
and reason for running with choke on is it is changes air fuel mix with choke on compensating for lack of fuel from the pilot jet blockage
regards Jamie

Aug 07, 2011 | 2004 Honda CRF 150 F

1 Answer

IT START FOR FEW SECOND MAY BE THE PETROL NOT REACH TO CARBY HAT THE PROBLEM


Check your fuel filter in the fuel tank,if you have one.
If the mower/weedeater is over a year old, then I recommend that you buy
and install a new carburetor repair kit,because the diaphragm will get hard
and that will cause it to be hard to crank.
Sounds like you will need to clean the carburetor or replace your carburetor
internal rubber parts like the diaphgram and O rings.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small
rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid
and letting it run a few times like that and it will flush the gunk out of
the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to
reassemble the carburetor or follow the instructions you get with the
carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need
to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes
to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first
and then turn them back out to their orginal position before you started.
Please rate me

Dec 21, 2010 | Yard Machines 158cc Push Lawn Mower #11a...

1 Answer

My suzuki rm 250 starts and runs for a few seconds then stops . I have taken carb of and cleaned it out and seems to be fine. there is also a really good spark from plug.


First up, check all electrical connections are good, especially magneto wires exiting crankcase and CDI and coil. Check the continuity of the different phase wires with a circuit tester to be sure.
Disconnect the manifold from airbox to rear of carby, at least enough to put a flat piece of cardboard against back of carby throat inlet. Start, and if bike stays running, you have an obstructed air filter or airbox inlet.
If it still stops, then place the cardboard firmly across carby inlet and turn over engine with throttle open. There should be fuel visible on the card. If no fuel on the card, you have fuel delivery issues and likely cause is an obstruction in jets or float needle/seat. Check condition of fuel filter and fuel flow from tap also.
If you have fuel visible on the card you may have badly set air mixture screw (generally 1.5 turns out) the wrong sized jets fitted or a leak in the inlet manifold. Are the reeds in good condition?
Goodluck, cheers!

Nov 13, 2010 | Suzuki RM 250 Motorcycles

1 Answer

Fuel is leaking from the carb into the cylinder and airbox when bike left overnight. Changed the jets but problem still there


You should adopt the habit of turning the fuel tap off when not riding, this will isolate the gravity pressure from the fuel in the tank.

The jets control fuel flow when engine is running,

I would think your float needle and seat is worn in one or more carby's. try a spray through of carby cleaner by turning fuel tap off and taking fuel drain screws out of all 4 carby's, disconnect fuel hose from fuel tap, allowing fuel to drain from lines and carby's. Spray carby cleaner into fuel hose and allow to flow out through all four carby's, allow to drain fully and dry out. Replace drains and fuel line and let fuel flow to carby's and see if a spray clean has done the job.

If not, inspect each floatbowl needle and seat. The link below gives exploded views of the bike in sections, with part names to help you get to them. Cheers.

http://www.cmsnl.com/suzuki-gsf600-s-bandit-2000-2003-usa_model16067/partslist/

Jul 31, 2010 | 2002 Suzuki GSF 600 S Bandit

1 Answer

My 1991 suzuki gsf400 has erratic idling. also is hard to start.


This could be almost anything, probably minor. Good premium unleaded fuel, fresh/clean and gapped plugs, fuel filters clean,. Carbies clean and jets good, correct float levels, no air leaks in intakes, air filter clean, Electrical connections 100%, ignition coils OK, no sign of moisture behind magneto/stator cover or on source/pick-up coils. Engine earth wire secure from head to frame?
So....
New plugs, 0.7mm gap to start with and set air* mixture screw 1.5 turns out.
To flush carby with cleaning solvent (spray can from auto access.) Take float bowls off (check for sediment) and fuel lines off and spray till it pours out of float needle seat, Loosen carby clamps and swivel carbies outwards 90 degrees and unscrew pilot jets and spray thru also. Check operation and smooth return of choke.
* Air mixture screw controls fuel-air mixture at idle speed and is a trial and error thing. Pilot and Main jets regulate cruising and acceleration mixtures and ranges according to rider style and riding and climate conditions.
If there is any undue noise comming from the top of the engine with revs slowly rising from idle to 2000 revs, you may need to check camchain tension and valve clearances, easy done with some simple tools and a manual. Downloadable free with an engine search!
Goodluck and Cheers.

May 02, 2010 | 1991 Suzuki GSF 400 Bandit

1 Answer

How do I adjust a Mikuni roundslide carb. Thanks


Turn the air screw and the throttle screw inward until they LIGHTLY seat. Now turn each of them outward one and one half turns. This is the factory setting. You might want to clean the carbs. After cleaning, before you put the slide back into the carb, move the clip on the jet needle downward one notch. This will richen the fuel mix and help with the bog.

Dec 11, 2009 | 1978 Moto Guzzi V 50 I

1 Answer

Can I just soak carbs, or do they need rebuilding?


Hi there
You will need to fully strip down the carbys to give them a good clean.
This will let you see if corrosion has set in.
Remove all the jets and clean, then blow through all the jets and holes in the carby bodys to see that everything is clear and not blocked.
You should remove the slides and needles and the jet that the needles go into(emulshion tubes). These have tiny holes in them that block easily so make sure they are clean.
Also remove the mixture screws. Then once you've blown out the holes(orrafices)replace them and set to 1.5 turns out.
You will need a pair of vacume gagues to set the sync(if the sync is out)
Regards Andrew Porrelli

Dec 07, 2009 | 2006 kawasaki KX 250

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