Question about 1981 Suzuki TS 185

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Carb tuning How far out should the idle screw be adjusted as a start point?

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  • pjgay Dec 31, 2008

    Thanks heaps!! happy new year!!

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The air screw should start at 1 1/2-2 turns out.
The idle screw should be where it just barely moves the slide( you can feel when it touches then a little more)This is just a rough setting it will need dialed in on both after you get it running

Posted on Dec 31, 2008

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Posted on Jan 02, 2017

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How to start to adjust,idling screw on blower


Idling screw or 'tick over' is adjusted by a tuning screw on the carb, usually marked with an [ I ] Turn it clockwise until the revs increase and the engine ticks over without stalling

Apr 23, 2016 | Garden

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How to adjust carb settings


Hi Charlie.<br />Operations to be performed depends on how much tuning is needed.<br />Carb setting regulates the ratio between air and fuel in the mixture aspired into the cylinders.Optimal air/fuel ratio is usually around 14(air) to 1(fuel). I illustrated the complete job with cleanup and jet replacement and adjustment. In some situation you do not need to perform complete tuning, which involves taking apart the carburetor. In that case perform basic regulation setup using the two adjustment screws at one side of the carb. Adjustment simple procedure starts from part 2/Adjustment. A good approach is first doing adjustment using idle and thickener screws. Then do the whole tune up if the simple adjustment does not work.<br />The complete tuning is based on carburettor cleanup, regulation of main jet and idle jet and needle setup.<br /><br />Part 1 : Complete tuning and cleanup:<br />1. Take apart the carburettor,<br />2. Undo the float chamber(6 in diag) held by screws (26 in diag).<br />3. Clean bowl with with carb cleaner (put a lot of it in the bow, wait a bit and dispose it-finish the job with a cloth if needed) . Clean floats (nr.4) and other parts using carb cleaner and cloth.<br />4. Use a flat screwdriver to remove the main jet screw (placed in the chamber, held by big golden screw, goes between the floats). Spray the main jet. You must be able to see through it.<br />5. Use the carb cleaner to clean the accelerating pump and all the other parts inside the part. Needle and small parts must be cleaned. Clean the idle jet, which is the smaller golden screws. If you have a compressor blow into the jets (you can blow them even without compressor, but follow H&S).<br />6. If possible replace main and idle jets. Sometimes you may like to replace the jet with a bigger one to get a richer mixture.<br />7. Adjust the needle if needed. A lower needle settings means a richer mixture.<br />8. Remove idle adjustment screw (7) and main adjustment screw(31), clean them screw them back in without tightening and perform part 2. Leave the screws about one and half turn from all way in.<br /><br />Part 2: Tuning and minor cleanup - Here you mainly operate on idle and air (thickener) adjustment screws (8 and 12 in diag)- Start from here, if this does not work, do part one:<br /><br />1) If the engine runs start from idle adjustment: screw or unscrew the idle regulator to adjust the idle speed, the screw is placed to one side of the carburetor and has a spring (part 12).<br />Keep idle least slightly higher than the minimum needed. Example, if the engine stays on slightly below 1000 rpm, set idle to a bit higher with engine revving above 1000 rpm.<br /><br />2) The thickener, placed near that of the minimum screw regulates the air flow. Tighten the screw and unscrew 2 turns from all the way in. Do regulation from this position. <br /><br />Here carburetor diagram and part list. The diagram is taken from service manual. The manual for Lifan 150 (does not include carb setting) has been uploaded here:<br /><br />http://www.mediafire.com/?o3r8x2ujrdbfb6o

on Oct 29, 2011 | 2008 Lifan Delta 250 V Twin

1 Answer

What is the adjustment screw under the throttle?


Hi Darren, on the right hand side of the carburator there is an idle adjusting screw with a spring behind it, turn screw clockwise to increase idle counter clockwise to decrease idle. At the front of the carburetor on the bottom of the venturi bore there is also an air/fuel mixture screw inside a carb body lug that may or may not be plugged with an aluminum cap that's about 3/16" thick. This cap can be drilled out to acess the air/fuel mixture screw. Turning screw clockwise will lean out mixture and lower idle, turning screw counter clockwise will richen mixture and raise idle. Start by turning gently the screw clockwise until it just barley bottoms out then back it out 1 3/4 turns. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/8 turn, snap throttle to confirm responce, you may continue to back out air/fuel mixture screw untill desired throttle responce is achieved, if you see black smoke coming out of exhaust you have gone to far and need to turn screw back in 1/8 turn at a time, final adjustment should be made with the engine at normal operating temperature. For more information about your question please visit the websites below. Good luck and hace nice day.
CV Performance Tuners Kit part 1
CV carburetor tuning part 2 Mixture screw adjustment
Harley CV carb mod
Adjusting Throttle Cables on Harley part 1 by Dr Chaos



Jul 09, 2015 | Harley Davidson FLSTC Heritage Softail...

1 Answer

I need to know the proper tuning of ucal mikuni carburetor with mixture adjusting screw on bottom of cabr (beneath float bowl), an idle adjust screw and pilot screw (hopefully pilot fuel screw since s


Why did you need to clean the carb? Routine servicing of the aircleaner would keep the carb clean for life. The pilot screw should be 1.5 turns out approx. with a small adjustment either way. Idle speed is set to a smooth low idle.If this doesn't fix it have you got something in the carb not replaced correctly? The float needle/float assy? How did you clean it? Have you introduced fluff/dirt into the carb and did you blow it clean with an airline?

Oct 09, 2014 | Motorcycles

1 Answer

I need to tune up my saw but I can't find my owner's manual. It won't idle. Need to know how to adjust the low speed. It runs well but my low speed idle won't adjust to make it keep running.


The theory is much the same on all chainsaw carbs, start and warm the machine up, increase the idle speed with the idle screw if it will not tick over, start to turn the L screw in, the revs will increase as the mixture leans off, it will reach a point where it is too lean and start to die, at that point turn the screw out 1/4 turn, check it revs up clean, if not turn screw out bit at a time until it does, now set the idle speed with the idle screw. Before attempting this make sure the fuel filter is clean, and also the air filter.

Apr 20, 2011 | Poulan Garden

1 Answer

I have a 1982 Kawasaki KZ1100D1 Spectre and have problems with it red-lining upon starting. It was running fine and idleing @ 1500rpm and I thought it was a little high so I adjusted the Idle screw and...


If you had to adjust with a screw driver you are probably altering the air bleed or mixture control and not the idle speed as a rough guide turn the screws fully in but do it gently as winding them in hard will damage the carbs and then undo the screw one and a half turns this should bring the carb back
into range
the idle adjustment is a finger adjustment knob in the center of the carbs(fuel tank lifted or removed to gain access) the problem with too high idle can be du to air leaks through the inlet rubbers leaking or being perished check for gaps bettween mating faces of carb rubbers to cylnder head

Feb 10, 2011 | 1984 kawasaki KE 125

1 Answer

My Ryobu RYO8554 only runs when it is in the carb lever is in the start position. ANy use of the throttle kills the engine. been that way since I bought it. Thanks Jim


Hi, if you have the lever in start that means the carb is choked. If you are only able to run the engine when the choke is on, then it is starving for fuel. First, make absolutely sure you have the right fuel mixture, then try to start the engine. If the mix is correct, then your carb is out of adjustment. Find the two screws that adjust the high and low idle on the carb. Turn the low idle one quarter turn counter clockwise and try to start the engine again. This adjustment will allow for more fuel to deliver into the cylinder. (adjust more if needed). The high idle may also be out of adjustment, so tune this screw with the throttle on high (and running) until you hear the transition between the high rumbling sound and the high even sound this point is you high idle. Good luck

Nov 30, 2010 | Ryobi Backpack Blower 25.4cc

1 Answer

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.

Good Luck
Steve

May 07, 2010 | 2002 Harley Davidson FXD Dyna Super Glide

1 Answer

How to adjust carbs i screwed the throttle screw in all the way and lost track how many turns it was now it will not start


you should have 3 adjustment screws. the one marked T is throttle idle position,adjusts idle speed.Lo adjusts air-fuel mixture at low rpm,HI at high rpm.H & L should be 3/4 to 1 1/2 turns out from a lightly seated position.adjust for best rpm's at Lo,then Hi.turning idle screw in too far would not affect starting,only idle speed.

Sep 28, 2009 | Garden

2 Answers

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!

Jun 27, 2009 | 2002 Hyosung Comet 125

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