Question about 2008 HM CRE F500XI

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Carb adjustment I've got a f500xi . It runs well but I am getting a lot of sooting on my sparkplugs. I put new plugs in after I got it because it was running rough and the old ones were all black. A little more than a week after putting the new plugs in

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It started running rough again. I checked the plugs and they are black already. To me this means the carb is running rich but I don't know which screw to turn to lean the mix. I'm hoping that will fix the problem. Anyone know what I should do and if it might be another problem?Do a compression check. If you got fuel air and spark then the only thing you are lacking is compression. That is if the fuel to air ratio is correct. Im not sure about the carbs on that bike so cant help you with the adjustment.,,,

Posted on Nov 10, 2008

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Air screw setting

see the manual, it might tell you that it is factory set and should never need adjusting unless you need to change the screw.
but as a guide for air-screw adjustment you can start at 2 turns out from a light seat. what you are looking for is the fastest idle speed in the adjustment range then quarter turn in. after that you should read the spark plug when hot. before doing any mixture adjustment check to make sure the soot is from the fuel and not oil soot, oil soot feels greasy between your fingers and often results from worn valve guides / seals or/and worn piston rings/piston. Small engines get revved a lot and wear is quite rapid.

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750 virago 1983. Dying after giving it any throttle

If the bike has been sitting awhile it more than likely needs a carb clean. But don't do a carb clean by putting any kind of cleaner in the gas. It will just plug the jets that much more.

Nov 12, 2013 | Motorcycles

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I put new fuel new filter cleaned carb and replaced enrichener, checked for power to enrichener, and was good, if I hand choke or use starting fluid it starts but is cold blooded but then runs fine wh

The blast almost doesn't need the enrichener unless your trying to start it in 30 degree weather. I would think that you have a fueling issue - carb air passages are plugged. There is a lot to cleaning a Keihn CV carb correctly. if not done the right way it will act just as you describe.

May 04, 2012 | Buell Blast Motorcycles

1 Answer

My 1969 triumph bonneville keep burning sparkplugs ( every part is new )

Just so we\'re on the same page, by "burnt spark plugs", you mean the porcelain tip is white with no sooty or oily residue, right?

Could be the ignition is retarded too much (with will make an engine run hot)

Spark plug gaps that are too close will not fire lean fuel mixtures.

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Here is a spark plug diagnosis chart:

By "burnt spark plug", I\'m assuming you mean what the chart refers to as "overheating"

Feb 26, 2012 | Triumph Bonneville Motorcycles

2 Answers


If the carb is a factory carb and has not been modified, there is only one adjustment on the carb. This is the throttle stop screw to set the idle speed with. The only other adjustment is the idle mixture adjuster screw but it's covered with an "anti-tamper" plug to keep people from messing with it. It has been set at the factory to meet EPA regulations. You cannot adjust the idle mixture unless you take the carb off the bike and locate the small plug just behind the float bowl. Drill a small hole in the plug. Drill lightly and just enough to punch through the plug or you'll damage the brass mixture screw under the plug. Then put a sheet metal screw into the hole and pull the plug out. Then, you'll see the idle mixture screw that the EPA does not want you to adjust. Once this is done, take the float bowl off and locate the slow speed jet in the carb. It will down in a deep hole beside the main jet holder. Take it out with a screwdriver and see what size it is. It should be a #45. Replace it with a #48 or a #50. While you're at it, take the top off the carb and remove the slide. Take the needle holder out of the slide and remove the needle. Put a 3 mm flat washer that is about 0.020" thick on the needle from the long end. Use a small dab of grease to hold the washer on the needle and reassemble the carb. Be very careful to get the slide diaphragm back into it's slot around the top of the carb. Do not pinch it or you'll have to replace the slide and diaphragm. It ain't cheap. Put your carb back on the engine with a new intake manifold to carb seal. Start the engine and allow it to warm up and then adjust the idle mixture to the highest smoothest idle. I believe the bike will run a lot better and a lot cooler.

Good Luck

May 29, 2011 | 2003 Harley Davidson FLSTFI Fat Boy

3 Answers

I have a 2002 suzuki drz 125L dirtbike and im having a hard time starting it. And once im able to start it when ever i give it gas it shuts off. The air filter is clean and so is the carb. Any one have...

The carb on a DRZ 125 or KLX 125 comes pre-set from the factory with a very lean tuning. At first it may run well but once you get some time on it with a little build up and some dirt the lean setting gets even worse. To correct this you need to thoroughly clean the carb , specifically the fuel screw. Remove the carb from the intake and airbox rubbers and take off the slide cap. Drain the carb from all fuel. The fuel screw is in a recessed tube located on the bottom of the carb on the front side towards the cylinder. It may ahve a brass plug covering the screw. This is done at the factory to prevent tampering for emissions purposes. The plug can be removed by taking a very small drill bit 1/8" or so and very carefully drilling a hole in it. Put a small sheet metal screw in the hole and pull with pliers and it should come out. Make a note of the position of the screw and slowly turn it clockwise in to see what the setting is. Do not apply heavy pressure when you feel it getting tight stop. It is a soft brass screw with a fine point an is easy to damage. Typically the factory settings range from 1 1/2 to 2 turns out. This is way too lean for the bike to idle and run well or even start without the choke. back the screw out and remove the spring and O ring. Using carb cleaner with the hose attached insert it into the hole you just removed the crew from and spray it out. You should have a good stream of spray into the center bore of the carb. Re-insert the O ring and then the spring and fuel screw. turn it in until you feel it making contact and then note the position and back it out 3 1/2 turns. Put the carb back on and it should be able to start and run without the choke. Some bikes will still need a bit more tuning. The older carbs had a slide needle that had 3 to 5 positions on the needle that could be adjusted with the movable clip. Since this does not have that option you could go to a Yamaha dealer and buy the needle from a TTR 125 and install it as it is the same carb. This will cost you around $15.00. Or you could go to a hardware store and buy some 3/0 stainless washers and remove the needle and put 2 or 3 under it to shim the needle up just like the clip on an adjustable needle. You may spend $1.00 with this option. The bike should run better than new.

Apr 23, 2010 | 2005 Suzuki DR-Z 125 L

1 Answer

Fouled spark plugs

this is helpfull???? fould plugs! what with? oil? or soot?
if its oil its getting past the pistons and being burnt in the engine,,,worn out engine! if its soot,,,its the carb ,,its running to ritch,,,,or the choke is sticking on,,,

Feb 05, 2010 | 2006 Enfield Enfield Thunderbird

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