Question about Motorcycles
Yes, you have to adjust the Idle screw. If you are referring to a "ninja" as a scooter I would take the machine to a mechanic. If you are referring to a multi cylinder sports motorcycle.I would take it to a mechanic. The only reason I say that you should see a professional is because there is no "Tuning screw" on a motorcycle.
Posted on Feb 12, 2012
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Posted on Jan 02, 2017
Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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Posted on Mar 29, 2009
You need to fix the fueling first - without fuel it won't run!
Your other problem sounds like an air leak - either the manifold or the carb. Check by spraying WD-40 or CRC at the manifold and carb join while the bike is running - if the revs change (either up or down) you have a leak.
Posted on Jun 29, 2009
Do what you have to do, Keep all your screws in a bowl or jar so you will know when you have them all back in. Look at each screw you take out and you will have a mental picture for reassembly. Don't take anything apart and walk away from it. It won't tske long if you stay with it until it's fully reassembled.. Good luck
Posted on Jul 01, 2009
ALWAYS have a fire extinguisher on hand when working on carburetors. Drain the carburetor. There should be a plug on the bottom of the carb float bowl. Remove the plug then replace it after the fuel drains. Remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the air screw on the outside throat of the carb and spray into the screw hole as well. Be sure to put the air screw back in. IMPORTANT > do not tighten this adjuster down. Only screw it in until it LIGHTLY seats. Now turn the air screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine.
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Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part and/or the notation "Not Available" is in the description, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
Posted on Aug 17, 2009
Hardrider, I just went through this delema myself. The choke is not actually a choke like on a car. It is actually a fuel richener. There are three jets in each carb. The main jet, idle jet and the starter jet. The main and idle jet can be removed. The starter jet, which is key to the problem, is pressed in. It is the small brass jet by the main jet. This gets clogged very easily. You see, this jet fills a small chamber under the choke rod from the fuel bowl. When the rod is slid out of the way when you slide the choke lever back, the fuel in this chamber is pulled into the cylinder when it turns over. I had to use a very small stainless wire to clean it out. I used a wire cut from my wire wheel.
Disassemble each carb completely. Soak each carb in carb cleaner and wash off per instructions. Then poke the wire into the starter jet until it goes through. You will be able to blow air through it if it is unclogged. Once you do this it should fire right away and then idle. What you are doing by opening up your idle screw is allowing more air in to pull fuel in through the idle jet. Make sure you sync your carbs too. Smooth idle is also dependant on that.
I use two vacume gauges that I purchased from Harborfriegt for $12 each. I sync one and two, then three and four then two and three.
Hopefully this helps you. My bike runs like it just came off the show room floor.
Posted on Mar 18, 2010
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