Question about Yamaha FJ 1100 Motorcycles

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Idle mixture screw is broken off,leaving just the tip in the carb body.i tried solvent and press,stopped before i made it worst.how do i extract them?

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Carefully drill a hole about 3/32" in the center of the broken screw. Gauge it that you stop before you go through the remains of the screw, Get a piece of hard steel and grind it to a square point that tapers and will jam in the 3/32" hole. Tap it into the hole and you should be able to turn out the remnant of the screw. Be careful that the drill does not run into the carb body, pewter is very soft and it is easy to damage the surrounding metal. If you are worried that the screw may be seized in the carb body, let it soak in penetrating oil for some hours before attempting the extraction.

Posted on Mar 19, 2011

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I would take the carb off, and with a pillar drill, drill out enough of the broken screw to fit a tapered left hand threaded stud remover and unscrew the porion that is still in the body of the carb. Then replace it with a new one.

Posted on Mar 19, 2011

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I am not sure if you remember my posting, Custom Harley, my son played with the fuel mixture screw and idle. I have a question for you. I have the bike now and I have not had the time, but without the...


If your carb is a stock Keihen CV, with the large flat top on it, the idle mixture adjustment screw should be sealed unless someone has taken the "anti-tamper" plug out. The idle mixture screw is on the bottom of the carb behind the float bowl. Kind of difficult to get to. But, if this is the type carb you have, turn the screw inwards carefully until it stops. Do not apply a lot of pressure to the screw. Now back the screw out about 3 1/4 turns. This is a good starting point for this carb. After warmup, adjust for highest smoothest idle.

If you carb is an S&S Super "E". The idle mixture screw is the large screw right in the center top of the carb body. Turn it in until it gently seats and back out 1 full turn. This is the starting point. Allow the engine to warm up and adjust for highest smoothest idle.

Set the idle speed with the idle stop screw at 1000 RPM's or so. Don't idle it too low. It is typical for the enricher to turn itself off when you first take off. When you come to a stop and the engine is not to full operating temp, it may stall. You can carefully tighten the choke cable by turning the knurled portion of the cable right behind the pull knob. Do not overtighten as it breaks easily. Never lubricate the choke cable. Let me know if this works.

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Is the carb adjustment screw on bottom


Hello

>>The Following is an Instruction File I made for Correcting this Problem. Any Input is Appreciated.
>>****All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers.
>>There are Several Location for the Air Mixture Screws.
>>The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body.
>>If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is the Nearest to the Engine.
>>The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body.
>>The Engine Idle Screw is Usually Easy to Identify because you can See where it Makes Contact with the Carburetor Throttle Shaft Plate Stop Ear. The H and L Air Mixture Screws Go Into the Body of the Carburetor and the Tips Cannot be Seen.
>>Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore).
>>If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required.
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns.****
>>Holding the Throttle Full Open, Start the Engine.
>>Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle.
>>Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required.
>>Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle.
>>Reset the Engine Idle if Required. If This Carburetor has a Single Air Adjustment.
>>Use the Section Above that Pertains to Full Throttle RPM Air Mixture Screw and then Adjust the Screw if Required to Eliminate Any Hesitation when Rapidly Throttling from Idle to Full Throttle.**
>>1- http://www.repairfaq.org/samnew/lmfaq/lmclctc.htm
>>2- http://www.cpdonline.com/692509.pdf .
Please, Do Not Hesitate, If you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

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