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Hi have poor idle after 2 years of storage and stiff throttles, am removing carbs for clean, where are slow run jets

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The stiff throttle is probably the grease dried in the cables.
Try this, take the throttle and brake assembly apart on the bars, get a tennis ball cut it in two. Pierce one in the centre and push it onto the throttle cable end. Fill will a tablespoon of oil and leave overnight with a rag around the other end of the outer cable where the inner cable exits. This will lube the cables.

The rough running is probably a result of dirt somewhere, either the carburettors, or the ignition system or it might even be muck in the fuel line coming form a rusted fuel tank. Check the fuel filter for dirt and replace if required. Check the points if its not electronic-ignition and clean with some paper between them.

The idle jet adjustment will be on the carb but it depends what carb as to exactly where it will be fitted. Take a look at this video on youtube. It's about a two stroke engine but where the carb is involved the mechanics will be the same or similar. If it's multi cylinder/multi carb then you will need to balance the jets to make it idle properly.

3 CARB SLOW JET ADJUST EASY WAY

Posted on Apr 17, 2015

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Posted on Jan 02, 2017

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1 Answer

Idles with 1/2 choke. If open choke, or throttle - engine dies without any RPM spike. Carb was cleaned, jet is clean. When idles, there is gas in the primer bulb.


Hi, Andrew and the usual suspects are:

1. Fuel cap or fuel tank is not venting properly.

2. Fuel filter clogged.

3. Fuel line pinched or kinked.

4. Float needle and seat sticking.

5. Float level too low.

6. Carburetor bowl vent line clogged/blocked/pinched.

7. Idle adjusting screw set too low.

8. Air/fuel mixture screw set too lean.

9. Idle port, transfer ports, slow air jet clogged.

10. Slow fuel jet clogged.

For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.

Bike won Run without Choke

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Bike starts up idles on choke dies with choke off our when warm XS650 Forum

What could be wrong if bike will only run on choke

Mar 10, 2016 | GAS Motorcycles

1 Answer

Briggs Stratton 5hp I/C starts ok, runs, but will not rev


My money is on a partial blockage of the main jet or the passageway to it. You're having to force it to run through the idle jet by fully choking the incoming air. There's not enough gas coming in with the choke open to allow it to run.

I'm thiniking total carb disassembly, carb cleaner and an air compressor combined with a ton of patience will take care of the issue.

Mar 31, 2015 | Briggs & Stratton Briggs Stratton...

1 Answer

I have a 2006 YZ125, that has pretty much been just garage kept since bought new in 2006. I've cleaned the carb and jets and cleaned the plug. The jets were gummed up but its still cutting out high rpms or...


Hi, Jamie it should be noted that your performance issues are not electrical ie. faulty charging system, battery condition, and connections etc. If your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues. For more information about your issue and valuable "FREE" downloads that you will need please click on the websites below. Good luck and have nice a day.
Yamaha yz125 look over and carb help
MototipsTV Replacing Float Cleaning Carb
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Jul 05, 2013 | Yamaha YZ 125 Motorcycles

1 Answer

I have a 2002 yamaha kodiak 400. It wil idle, but when you give it throttle it dies, you can hold your hand partially over the intake and it will take the gas fine. What do I do?


Hi Rick

If old gas has may have always kept in the carb over the winter or over time gas turns to a varnish like gooing,, when not Eng not running for a long time,,, and it may have plugged you Idle jet inside under the bow... whats happening its starving for fuel and that jet is not letting enough fuel through the Idling circuit of your Carb,, and wont Idle so putting your hand over the carb you are getter more fuel through cold start jets and circuits or you may even have water and dirt in the jets and bowl check you fuel tank if it fresh fuel check your fuel filter replace it if you going to clean out carb always use fuel stabilizer in your fuel tank just incase you dont get to fire it up some seasons , one other thing look for any vacuum lines off or loose carb bolts and screws. Bottom line time to blow out the carb and even sock t carb cleaner if real bad but you need to remove all rubber parts from Carb I would leave it just take bowl off remove jet and look for small passage ways in the jets u need a real thin stiff wire like they use for weldig torch tips find one that fits.

Joe

Oct 09, 2012 | Cars & Trucks

1 Answer

1992 Suzuki GSF 400 Bandit carburetor jetting


Hi, Crazystang79 if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Carb Rebuilding Needle Jets Jet Needles etc
Carburator Theory and Tuning
Suzuki GSF 400 BANDIT Service Manual
OEM parts for Suzuki
http://mybikemanuals.com/suzuki

May 17, 2017 | 1992 Suzuki GSF 400 Bandit

1 Answer

Starts but will only keep running while choke is on


Most likely your slow (idle, pilot, whichever name you prefer) jets are plugged up in your carburetors. If the bike was stored improperly, or old/dirty gas was in the tank, these jets get plugged up pretty easily. One if not all are probably affected. The slow jet is where your bike pulls gas while it has a closed throttle position. Its the smallest jet in the carbs. When you twist the throttle, the needle (blocking the main jet from being used) opens up and allows gas to pass it and up into the vacuum of your carb and into your engine. If the idle jets are plugged you will usually notice that if you give the bike throttle it will run great in the higher RPM (3000+) but will die and be "glitchy" or boggy when going from no throttle to open throttle. You can try to cheat a carb clean by getting some carb cleaner and spraying that down the carbs, and using seafoam or equivalent to get those jets clean, but its always a better bet to see whats going on inside and clean those things so you get your throttle response back. Goodluck.

Bruno

Oct 21, 2010 | 2001 kawasaki ZX-6R Ninja

1 Answer

My 1993 Honda Knighthawk wont run.


The slow circuit of your carbs are dirty. you need to remove the carbs from the bike and thoroughly clean the internal passageways and jets. that should solve the problem. Always drain your carbs for storage and use fresh gas when you start up after long storage.

May 15, 2010 | 1993 Honda CB 750 Nighthawk

3 Answers

Bike will not idle witout having choke on a bit


I have a supermagna and used fuel stablizer once and it wasnt fit it gummed my carbs up,ive cleaned mine often and it isnt rocket science,remove the tank airbox assembly,loosen up the boot flanges that hook the carbs to the motor(ones on carb)then remove the carbs,then the cables,choke and throttle,do not remove carbs from assembly(leave all 4 together)remove the bottoms and tops of a carb,removefloat and jet,then remove all the brass jets and clean them so you can see through holes,,blow out all the holes in carbs,and reasemble,works for me every time,about two hours to do,good luck

Mar 24, 2009 | 1987 Honda VF 750 C Super magna

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