Question about 2004 Yamaha XVS 650 Dragstar

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Just put on cobra drag straight pipes plus pod filter.. set miture screws out 3 turns. it then smoked after idle for cpl mins. screwed inwards 1 turn. still slightly smoking, turned 1/2 turn (so now its only screwed out 1.5 turns) no more smoke, when take of, there not as much power, ffels like air choking it, when back off it pops any assistance would be appreciated ...

Posted by Anonymous on

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  • Master
  • 8,909 Answers

The ignition timing has to be reset as the pipes you have fitted have a different back pressure than the originals. Take it for a tune up and feel the difference. It would be a shame to not get maximum performance having bought some really good pipes!

Posted on Dec 31, 2010

  • Anonymous Dec 31, 2010

    Am i able to reset ignition timing without it going in for service

  • specialistel Dec 31, 2010

    If you know what the settings were and it isn't fully electronic, otherwise computers are required to reset the timing.

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I have A 1988 Virago 1100 With Cobra Mufflers and The Carbs Are Jetted with A cobra I stage Kit And The Fuel Air Mix Screws are new It Cranks And Runs But Black Smoke Is Comming out of the Pipes Whats


Sounds like you need to take it to a shop that kinda knows what they are doing. If they have problems they can call cobra themselves. As a shop the aftermarket companies are usually pretty good about helping out since most of their product is sold or installed in aftermarket shops. With that being said. I would start by dropping the clips up one notch and see how that works. By sliding it up one notch it should run a little leaner . If it's better but doesn't cure the problem then go up one more. If it does clear up the black smoke then there you go. Generally cobra will tell you in the directions what common jets to install. They even have a section for higher elevations as well. If not in the directions they usually do on their website. Hope this helps a little.

Dec 01, 2013 | 1986 kawasaki GPz 1000 RX

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Valk 6 pipe cobra turning blue


Pipes turn blue because it's running lean.Not enough gas and TOO much air.Idle mixture screw needs attention.Turn in till ingine starts to die and back out to fasted idle.Then adjust Idle speed with the screw on cable at carb.

Oct 01, 2013 | 1998 Honda F6 C Valkyrie

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I have an 81 gs750 and I have pod filters shortened exhaust,


well you made 2 mistakes here.

1. pod filters
2. shortened exhausts.

These engines are designed and tuned specifically to run the best with the stock air filters as well as the stock mufflers and exhaust. Putting pods on and chopping off your exhaust pipes may look cool but it will cause the bike to run very poorly My advice would be to put it all back to stock and see how she rides and then change things one at a time.

Apr 15, 2017 | Suzuki Motorcycles

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Idle set 2004 fxdwg


Hi Anonymous, 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. 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. You need to balance the two adjusting screws to obtain an idle of 950-1000 RPM then back out air/fuel mixture screw 1/4 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. Good luck and hace nice day.

Feb 26, 2012 | Harley Davidson FXDWG - FXDWGI Dyna Wide...

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Have a1983 gs450L suzuki for a winter project. I got it to start after sitting for years. Took off mufflers and added straight pipes and put on airfilter pods plus went from 130 main jet to 140. Bike wont...


Go back to the 130 main jet. Be sure to check that both carb slides lift at the same moment. Also check to see if one carb is "driving" the other due to the idle screws not being balanced. Check the compression in both cylinders. It should be within 10% of each other. It is not likely that the bike has jumped time.

Sep 28, 2011 | 1983 Suzuki Gs 550 L

1 Answer

Carburetor adjustment SS,I played with the 3 adjustment screws the bike runs but its missing and bogging out. Can you help me?????????????


I assume that you're working on an S&S Super E. This carb is a bit much for an old Ironhead but I've seen plenty of them on these old machines. I think the Ironhead engine is the prettiest engine Harley ever built. They are also one of the most aggrevating as well.

On your S&S, the best jetting I've found for them is a #26.5 slow jet with a #68 or 70 main jet.

You must tune a Super E model the same way you tune a Super B model. The only difference between the two models is the "B" model does not have the accelerator pump. When you tune an "E" model, disable the accelerator pump by backing out on the screw that controls it. With the accelerator disabled, procede to tune your carb by turning the idle mixture control screw unwards until it stops and back out on complete turn. Now rev the engine, does it rev clean or does it bog? If it bogs, come out another half turn and rev the engine. It is better or worse. If you still can't tell, come out half turns at a time until you can tell it's either better or worse. By turning the screw out, you're adding more fuel. So if it revs better with the screw three turns out, you need a richer slow jet. If it gets worse, reset it to one turn out and start inward. If it gets better going inward, go to a leaner slow jet. Once you change the jet, go back to one turn off the bottom on your idle mixture screw and try it all over again. Eventually, you will get the slow jet right where you need it to be.

Now, tuning the high or main jet will have to be done on the road. Find you a long uphill run somewhere. With the bike in high gear, roll the throttle on wide open going up the hill. If the bike spits or sputter back through the carb, you're way lean. If it starts to pull back off on the throttle about an eigth of a turn and see if it pulls better. If so, you're just a little lean. If it feels sluggish or black smoke is coming out of the exhaust, you're too rich.

Once you get these areas worked out, go back and add your accelerator pump back in. Take it on the road and roll the throttle on. Does it bog or blow black smoke. Turn the screw one half turn at a time. If it gets worse, go the other way half turn at a time. Be careful not to get it too rich on the pump shot. Most riders do get the accelerator pump too rich. Have someone ride behind you watching for the puff of black smoke.

You can download the installation instructions at the S&S website. Go to the "technical" section and then to "installation instructions". These instructions tell you everything you need to know adjust your carb and then some.

One word of advice on your Ironhead. If you are running open drag pipes, you can tune your carb till you're blue in the face and your bike will have a 'dead spot' at about 50-60 mph somewhere. This is because you have no backpressure on your exhaust. To get the backpressure you need while keeping that bad sound you like, drill a hole in the backside of your drag pipes so that you can add a 1/4" X 1 1/4" bolt about an inch or inch and a half into the pipe. Most drag pipes have a hole in this area for the bolt that holds the baffle in. Look at another set until you find one with the hole for the baffle retaining screw. Drill your pipes the same way. Put the 1/4" X 1 1/4" screw into the pipe and put three nuts on the bolt inside the pipe. Make sure you get them all tight. This will usually put just about the right amount of backpressure on your exhaust to cure the "dead zone". Hope this helps. Good Luck!

Apr 02, 2010 | Harley Davidson XLH 1000 Sportster...

1 Answer

Fuel Mixture Ratio Is it - 25:1 40:1 50:1


not sure if yo are changing the jets out but if your using the original screws and jets screw both screws in till they stop then turn 1 and a half turns out they try starting if it kicks and won't run then turn each screw another 1/2 turn out try starting if it runs rough adjust the gas jet a little bit till it runs smooth once it warms up give it full gas and you should get just a slight puff of black smoke to be set right, if it's too lean it will get hot and will be hard to start if it dies, if that happens then give it extra gas. once warmed up it should idle without dyeing if it dies adjust the idle screw up 1/4 turn at a time till it runs at idle without holding the gas trigger, be sure you replace the in line fuel filter and fuel line first then clean the air filter before doing any adjustments. most problems are caused by plugged fuel filter due to ethanol in the gas.

Mar 10, 2010 | Garden

3 Answers

How do i adjust a S&S super B carb, cold start mostly


The Super B carb is not as forgiving of improper jetting as the Super E model carb due to the lack of an accelerator pump. The only adjustment you have on the carb is the idle mixture screw and idle stop screw. The idle stop screw simply adjusts the idle speed of the engine. The idle mixture screw should be adjusted somewhere between 3/4 and 1 1/4 turn out from the bottom. If it is out of this range, the carb is not jetted correctly.

Through experience over the years I've found that the Super B used on a Big Twin Harley should be jetted 29.5 on the slow jet with a 70 or 72 on the main jet. If used on an Ironhead Sportster, slow jet of 26 with either a 66 or 68 main jet.

The way to tune the carb slow speed circuit is to allow the engine to warm up and adjust the idle mixture screw one turn off the bottom. Then try to rev the engine. If the engine does not rev cleanly, try coming out a half turn on the idle mixture. If it seems to help, continue until it revs cleanly. If this is the case, you slow jetting is too lean, install a richer jet and repeat the above procedure. Once you get it tuned to where the engine revs cleanly with the idle mixture screw at one turn out, you low speed jetting is correct.

The high speed jetting is not quite as simple to set as this has to be done on the road. I usually find a long uphill run to test the jetting to keep top speeds reasonable. At about 55-60 miles per hour, roll the throttle on in high gear. Feel the way the engine pulls. If it pulls good, back off on the throttle about 1/8th turn. If it pulls better, it's just slightly lean. If when you roll the throttle on, the engine starts spitting back through the carb and doesn't run well, you are way lean. Either way move upwards on your jet size one step at the time and retest.

If the bike seems sluggish and blows black smoke when you do the "roll-on", you're too rich. Install leaner jet one step at a time.

Now, most people confuse a "mid range stumble" with a carb problem. All efforts to tune this stumble out done on the carb are futile. The problem is in the exhaust system. Most bikes do not like open drag pipes for street use. They will exhibit this mid range stumble. The remedy is to put a bolt with three nuts on it on the inside of the pipe or any other means to create just a bit of backpressure on the exhaust. This usually cures the problem or at least makes it easier to live with.

Full tuning procedures can be downloaded on the S & S site. Go to "Technical" page, then "Installation instructions" to download the full paperwork that came with your Super B.

I hope this helps and Good Luck.

Feb 03, 2010 | 1993 Harley Davidson FXR Super Glide

2 Answers

Does not run at full speed unless choke is at 1/4 setting. I checked the air screen and it is clear. I replaced the gas with new fuel 50:1 mix.


its a blocked carb or filter
clean out all the fule pipes and filters
"""even the one in the fule tank on the end of the pick up pipe""" and retune carb when starting up again
ps,, iv never liked running on a 50:1 mix?
i do 40:1 if it smokes a little ,,,,,its got oil in it!

Oct 27, 2009 | Homelite Consumer Products MightyLite...

1 Answer

Carbs cleaned but bike will not idle properly


The pilot jet controls the idle. Check your service manual for the jet location. Chances are the jet is plugged up by varnish. Count the number of turns as you turn the adjuster screw INWARD until it LIGHTLY seats. Now remove the adjuster screw. Clean the jet and then put the adjuster screw in and LIGHTLY seat it. Turn the adjuster out the same number of turns as originally counted. Don't seat the screw too tight because you can screw up the jet if you do. Remove the actual jet only if you must.

Please rate this answer. Thanks Shawn! Good descriptions :)

May 02, 2009 | 2001 Honda VT 600 C Shadow

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