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Air screw adjustment

I have a 72 Yamaha 175 CT2 motorcycle. My bike will run with air screw turned all the way clockwise, and you can even block the little hole in the bottom of the carb where the air filter hose hooks up. I have to have the throttle idle screw turned out about 4 turns or the bike surges while slowing down. I cant adjust the idle and bike has a funny chemical smell, like a vapor lock smell or something Please help Thank You Larry

Posted by Anonymous on

  • johnny bonacci
    johnny bonacci Jul 08, 2017

    the air screw should be set at 1 1/2 turns out.

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  • Expert
  • 78 Answers

Hi,
carbs varnished up
take that carb to a lawnmower shop and have them dunk it in their ultrasonic dunk tub. i dont know where your going to be able to find a replacement so theres an idea for you..

jm

Posted on Jul 08, 2017

6 Suggested Answers

6ya6ya
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SOURCE: hesitation problems 2003 yamaha wr 450 f

sounds like a jetting issue. change the main jets starting from the largest one you own and work your way down.

Posted on Dec 14, 2008

  • 3567 Answers

SOURCE: kx 85 04,bike had a slight bog when throttle was

Start with setting the air and throttle screws. Turn each one inward until it GENTLY seats. Back each one out one and one half turns. Clean the air filter and starter plunger. The plunger may need to be rebuilt or replaced. Check the pilot and main jet sizes. There will be a number stamped on the side of the jets. The pilot jet should be #45, the main jet should be #140.

Posted on Aug 01, 2009

davesoucy
  • 148 Answers

SOURCE: cant keep idle at one rpm

First, check that you gas cable is not kink or something when you replace the tank. Also do you know the procedure to ajust the carb. Let the motor heat up and ajust the two screw. Does the choke keeps on, or have something broken. Something big is just on front of you. PAtience, you'll figure that out... It doesnt sound like something that needs to be clean here...

Posted on Aug 05, 2009

  • 4088 Answers

SOURCE: How do I re-jet my carbs?

Basic setting for idle adjustments is ~1-1/2 to 2 turns CCW from CW stop. New stock (paper) air filters don't require re-jetting--only K&N foam replacements require one size bigger main jet. Adjust each carburetor idle screw for smoothest idle. Each screw should be about the same adjustment--if one is non-responsive, that carburetor may need internal cleaning. Make sure you have good spark plugs and the ignition points are clean and set to proper clearance. The ignition coils on these old Honda's were typically weak--try to find a modern replacement. The carburetor slide needles should have the 'C' clips in the center groove. Make sure the retainers are down tight. Check the engine valve clearances (about 0.003 " cold) for both valves when the crankshaft is set for TDC when that cylinder is coming up on compression.

Posted on Aug 11, 2009

  • 850 Answers

SOURCE: 1977 TS185 won't run smoothly; carb adjustment problems

thats the idle screw!
you need to adjust the mixture screw!

Posted on Aug 15, 2009

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