Question about Honda Silverwing 600 ABS Motorcycles

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Speed "chasing" at low speed constant throttle adjustment needed. Why??/

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Sounds like a vacum leak spray the carbs and in take with wd-40 if your bike revs up then pin point and replace offending parts.

Posted on Aug 14, 2010

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1 Answer

Settings for mixture screws


Most Chain Saw Engines Have Three Carburetor Adjusting Screws:
1. Idle Speed/Throttle Stop - This is the adjustment that controls how much the throttle valve (butterfly) stays open when the throttle trigger is released. If this adjustment is set too low, the engine will die when the throttle trigger is released. The throttle valve (butterfly) simply cuts off the supply of combustible air/fuel and the engine stops. If this adjustment is set too high, the high idle speed will cause the centrifugal clutch to engage and the chain will run. This is a dangerous condition and should never be allowed.
2. Low Speed Fuel Adjustment (marked L on carb, this is the low speed jet)- This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at idle speed. An adjustment that is set too rich will cause the engine to load up and die at idle speed. A mixture that is too lean will starve the engine and cause it to race or surge. An extremely lean adjustment will cause the engine to die, too.
3. High Speed Fuel Adjustment (marked H on carb, this is the high speed jet) - This is the adjustment that controls the proportion of fuel in the combustible air/fuel mixture at cutting speed. It would not be accurate to say that this is the most important setting, because all of these adjustments need to be accurate for a saw to perform its best, but this is the adjustment that determines how the saw runs in the cut. An adjustment that is set too rich will not allow the saw to reach the RPM level necessary to build maximum power. Throttle response may also be sluggish and the engine would smoke and perform poorly. A mixture that is too lean will allow the engine to reach an RPM level where bearing failure and cylinder seizure are likely. It will also lack power in the cut and tend to run very hot.
The preceding information briefly explains rich and lean running conditions. It also identifies the three adjustment screws and their function. It should be noted that some chain saws lack the high speed adjustment needle. These saws have what is called a "fixed jet" which is set from the factory. "Fixed jet" carburetors are used to prohibit the saw operator from setting the adjustment too lean and damaging the saw. Unfortunately, they also often prohibit the saw from achieving maximum performance.

Apr 11, 2016 | Garden

1 Answer

What is the proper carberator adjustment


Start with 1 full turn out from the closed position on both the idle and high speed mixture screws. After the engine has warmed up, hold the throttle wide open and adjust the high speed mixture screw until the engine runs at the highest RPM then turn the screw counter-clockwise about 1/8 turn.
Next, turn the low speed mixture screw in whichever position gives the best idle.
After making these adjustments, check the throttle response. If the engine hesitates when applying the throttle, turn the low speed mixture screw counter-clockwise about 1/8 turn.

Jan 30, 2015 | Garden

1 Answer

Stutter on low revs


Hi, Anonymous and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZF600R Forums View topic Low RPM hesitation
missing sputtering under low rpm acceleration
Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
OEM parts for Yamaha
Yamaha YZF600RP Owner Manual

May 15, 2013 | Yamaha YZF 600 R thunder cat Motorcycles

1 Answer

How do I adjust the carburator?


There are two needle screws that can be adjusted to make the engine run properly. Be certain that the carburetor is clean and the diaphragm is in good condition, and the fuel is new. The two needle screws mentioned above should initially be adjusted at one turn open from turned in all the way (lightly seated). Each of these needle screws performs different functions. One is for idle and throttle response (this screw is marked "L" and the other screw is marked "H". L and H are marked on the carburetor body and also on the plastic "shroud" near the adjustment screws. These screws are not interchangeable, being foolproof since the thread sizes are not the same. When properly adjusted the low speed screw (L) allows the engine to idle properly and throttle response will work properly. When the high speed screw is adjusted properly the engine will have correct power at full speed. Adjust the low speed screw so that the engine idles and when you squeeze throttle all the way to wide open the engine should not hesitate and should come up to full speed and when you drop the throttle it should idle nicely without stalling. Now adjust the high speed screw. Hold throttle wide open, holding it there while you adjust the high speed screw. If this scares you (be carefully so that the spinning chain does not cut you!) you may adjust the high speed screw at idle, turning it just slightly in or out. The high speed screw should be adjusted so that the engine does not run clean at wide open throttle but sputters slightly, slightly adjusted open from running clean to slightly sputtering. When under load (cutting a log) the engine should run clean. Good luck!

May 21, 2012 | Husqvarna , No.455 Rancher, 20" Gas -...

1 Answer

Poulan 45cc chainsaw will start running with starting with choke, but will not stay running.


Sounds like the low speed fuel adjustment is out of whack....you can reset it by turning it in all the way clockwise...then as a starting point, turn it out 1 and 1/2 times, start the engine and slowly adjust the screw until the engine starts to choke out..when this occurs, turn it back in until it starts to choke again...then you need to set it somewhere in between to find the "happy medium"....thew high speed screw is adjusted after you get the engine idling properly...if you haven't messed with this then I wouldn't worry about it..unless you have poor high speed operation, then you will need to set the high speed screw...the object here is to obtain the best low to high speed throttle...if , when you throttle up the saw, the engine bogs or goes to high speed slowly , here is where you adjust to get the best throttle response...use small increments until you achieve the desired response

Apr 26, 2011 | Poulan Garden

1 Answer

Onan performer p220 ohv will run fine then get very rough at high speed and idle. Has new fuel pump, all hoses are new and tight, and new fuel filter. Would appreciate ideas on what to check next


there should be 2 screw controls labeled "H" and "L"...these are the carb adjustments for low speed and high speed...you may need to adjust them to get the best possible response between low and high throttle performance...you only need to get it started and then slowly turn the "L" control until it idles smoothly..then move on to the "H" control and while going from low idle to high with the throttle trigger adjust it slowly until you get a good, smooth response from low to high

Jan 23, 2011 | Garden

1 Answer

I have a 2003 HD Heritage EFI (12k miles)... I have noticed when the engine is idling it sounds fine. When I am at highway speed (65MPH & 5th gear) I have noticed a loud intermitent clatter. at low...


Sounds like valve clatter, a common issue. We chased the same noise, with HD installing new push rods, adjustable rods and then they said it is a Harley. Not a real answer. This noise ruines the ride as it grabs your mind and focuses you on the noise.We tried different rod extensions within the lifter adjustment range, same deal. We chased for about 1 1/2 years, trying to not void warranty.

The only long term solution was to go to aftermarket (velvet touch) lifters and lifter blocks. Now we NEVER hear the issue.

Nov 10, 2010 | 2003 Harley Davidson FLSTC Heritage...

1 Answer

Hello, i find it impossible to maintain a constant speed (about 30mph) without the bike juddering , im having to open throttle - close throttle constantly to keep at 30. it has been back for repair and...


Bikes like yours with high horsepower output, a high revving engine, and relatively light weight are very sensitive when operated at low speed - and at low power settings. I have found that usually, after getting well acquainted with a particular bike, things become much easier have a fine control over. In the meantime, try running in higher - or lower gear, at that speed. Sometimes that can make constant throttle movements less necessary.

Feb 21, 2010 | 1998 Yamaha YZF 600 R thunder cat

1 Answer

Idle seems too low. runs great, when no throttle, stalls. maybe idle too low. no manual, need to know where idle adjustment screw is


If you haven't already adjusted the carb there are usually 3 adjustments. H - adusts performance at full throttle (how it cuts in the wood). L - adjusts performance at idle and accelleration to full throttle.It sounds as though those are fine. The third adjustment T - is the throttle or idle speed (often away from the other 2). If my saw that is the one adjustment I'd make. You supplied no make or model, it is difficult to provide what you requested without them. HTH
Lou

Oct 27, 2009 | Garden

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