Question about Suzuki GSX 750 F (Katana Motorcycles

1 Answer

Won't start New plugs, cleaned carbs top to bottom, adjusted fuel air mixture screw to stock, will barely start with choke and wont run without choke

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  • Suzuki Master
  • 767 Answers

Check the fuel level in the float chambers of the carbs, it could be too low! Readjust the float to obtain correct level. Blow out the primary and main jets with compressed air.
Hope you adjusted the air screw mixture at the right temperature of the engine i.e. you need to warm it up and than adjust also check the valve clearance of the engine.
Hope this helps

Posted on Aug 07, 2014

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6ya staff

  • 2 Answers

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Posted on Jan 02, 2017

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Anonymous

  • 1 Answer

SOURCE: looking for the air fuel mixture screws on carb any help?

[IMG]http://i199.photobucket.com/albums/aa59/88gixxer/100_4177.jpg[/IMG]

Posted on Apr 09, 2009

Anonymous

  • 5 Answers

SOURCE: Will not run without choke

have you checked for vaccuum leaks at the intake manifold? you can check by pouring water over the gasket area when/ if you get it running!

Posted on Jun 14, 2009

tombones

  • 3567 Answers

SOURCE: Hyosun Scooter Carb Adjustments

Very good thought process on the adjustments. The throttle screw sets the idle speed and the air screw sets the fuel mix at idle speed. The stock setting is 1.5 turns outward. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward.

From this point you adjust the idle speed then adjust the air screw for fastest idle speed at that throttle screw setting. If the idle speed becomes faster than desired after adjustment, just reset the throttle screw and then reset the air screw.

A “very helpful” rating for this answer? Thanks!

Posted on Jun 27, 2009

Geoff watson

  • 164 Answers

SOURCE: 2005 kx250f wont idle.will idle fine w/choke

the fact that it idles with the choke on indicates that fuel mixture is the problem here remove the mixture screw completely check that the o ring seal is not damaged & that the end of the needle is not worn or bent if either of these conditions are obviouse replace the damaged or worn parts general rule of thumb with mixture adjustment is 1&1/2 to 2 turns out give it a try

Posted on Feb 23, 2010

Noel O'Kell

  • 185 Answers

SOURCE: cleaned the carbs, changed the plugs gapped at 34

I would be checking for air leaks, this will give you a lean mixture. In particular look for the seals for the balance tubes and each carb.

Posted on May 04, 2010

Testimonial: "Balance tubes you were on the money thanx"

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Hi, Merlin the carburetor throttle shaft wheel has two cables the cable closest to the right side of the bike is the throttle cable and the one closest to the left side is the idle cable. Right about the middle between the two is the idle adjustment bolt it faces out towards the air filter end of the carb . The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle adjustment bolt clockwise to increases idle speed and counterclockwise to decrease idle speed. If you have access to your air fuel mixture bolt you may adjust it as well if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture bolt clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back it out 2 full turns to establish a starting point start the engine and check the idle rpm's and adjust the idle adjustment bolt accordingly for 950-1050 rpm if necessary, adjust the air fuel mixture bolt 1/4 turn at a time and let the engine settle for about 10 seconds, clockwise for a leaner mixture and counterclockwise for a richer mixture you are seeking the highest rpm your air fuel mixture bolt can acquire without going past 3 full turns from bottom then readjusting the idle adjustment bolt back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture bolt all the way in then your pilot/low-speed jet is too big. Final adjustment should be made with a clean air filter mounted to the carburetor. 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.
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Hi, Anonymous the carburetor throttle shaft wheel has two cables the cable closest to the right side of the bike is the throttle cable and the one closest to the left side is the idle cable. Right about the middle between the two is the idle adjustment bolt it faces out towards the air filter end of the carb. The engine should be at operating temperature with the enrichener off to set the idle between 950-1050 rpm. Turn the idle adjustment bolt clockwise to increases idle speed and counterclockwise to decrease idle speed. If you have access to your air fuel mixture bolt you may adjust it as well if not there is a video below on how to gain access, make sure you start with clean or new spark plugs. Gently turn the air fuel mixture bolt clockwise until it starts to bottom out "STOP" do not over tighten as it will damage the taper on the end, now back it out 2 full turns to establish a starting point start the engine and check the idle rpm's and adjust the idle adjustment bolt accordingly for 950-1050 rpm if necessary, adjust the air fuel mixture bolt 1/4 turn at a time and let the engine settle for about 10 seconds, clockwise for a leaner mixture and counterclockwise for a richer mixture you are seeking the highest rpm your air fuel mixture bolt can acquire without going past 3 full turns from bottom then readjusting the idle adjustment bolt back down to 950-1050 rpm If you can not detect any rpm change and can not stall the engine by turning the air-fuel mixture bolt all the way in then your pilot/low-speed jet is too big. Final adjustment should be made with a clean air filter mounted to the carburetor. 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 wonderful a day.
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I have a 1998 harley sporters, runs only when the choke is pulled out all the way and when I try to back it off, it stalls. I had the carburator cleaned, but it still does it..Can somebody offer me a...


If your bike was allowed to sit up for an extended period of time, the gasoline in the float bowl evaporated and left behind this gummy mess. It has plugged up the jets and possibly the small fuel passageways in the carb. The carb must be completely disassembled and soaked in a professional grade carburetor cleaning solution. Then, compressed air must be used to check all the passageways to be sure they are open. No fuel is getting into the main venturi of the carb for some reason. The enricher circuit has it's own venturi and pulls fuel directly from the float bowl. This why it will run using the enricher and not run when it's turned off. I'd suggest that you take your bike to someone that knows what they are doing with a carburetor. If whoever did the carb did it right, it should run without having to use the choke. You didn't say whether your carb was the original stock carb or an aftermarket unit. If your carb is the stock Keihin CV carb and the "anti-tamper" plug has been removed from the idle mixture screw, set the screw at 3 turns off the bottom to start with and then fine tune the idle when the engine warms up. The idle mixture and idle speed are the ONLY things you can set on any carb from the outside. The fuel metering is controlled by the jets inside of the carb.

Good Luck
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Aug 21, 2011 | 2007 Harley Davidson XL1200R Sportster...

1 Answer

I am trying to start a1987 1100sportster had running once for about half hour was popping thru carb and tailpipe tried adjusting carb helped sum i went start and now it wont.


There could be any number of reasons for the problem that you described. Your spark plugs could be fouled. Sportsters are very sensitive to this and they are notorious for not want to "clear themselves up" like Big Twins will do. Check your plugs to see if they're fouled.
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Hi, Emeraldcp and the usual suspects are:
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2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
13. Faulty auto choke or wiring connection.
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Idles but stalls when throttled


If you have the TB2BP EC Troybilt backpack and it bogs down or begins to stall out at full throttle with choke in FULL OPEN try the following:
1. Do the simple stuff first, Check spark plug, air filter and clean or replace if necessary.
2. Remove air filter cover, open choke and spray out the carb with carb cleaner.
3. Inspect carb and look for a flat surfaced screw with a small V notch on the side of it. It will be on the top side just forward of where the fuel lines connect. If you find it don't waste any more time looking for the High and Low fuel adjustment screws (there aren't any) this is the only adjustment other than the throttle adjustment screw you'll find.
4. Start your blower allow time for it to warm up and advance choke as far open as you can without stalling motor (mine just suddenly wouldn't run in anything other than full choke).
5. With motor running, adjust the screw to improve operation. Depending on your initial choke setting you may have to adjust, open choke to next position and fine tune.
6. Note- clockwise reduces fuel to carb, while counter clockwise increases it (if it's stalling when you attempt to throttle up it's starved for fuel) I'm sure there's a tool designed so that some tech can charge you 100.00 to turn the adjustment screw 1/4 turn but I found that a pair of fine needle nose pliers did just fine. Pay attention to original position of the V notch and what adjustments you make ( I tend to make 1/4 turns and fine tune from there) so you can always go back to your starting point. Note I'm not a technician so I can't say this the fix for your machine but it worked on mine.

Aug 21, 2009 | Troy-Bilt Garden

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