Question about 2001 Harley Davidson FLSTF - FLSTFI Fat Boy

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Carb ploblem i have a 2000 fatboy .my plugs are jet black i need to rejet it but i dont know what type of carb i have .it is held on with 3 allen bolts it has a acceralter pump on it and when you take off the air filter and look straight in at the carb like a set of binoculars

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Sounds like you have a new style holley carb it is the only one thats fits that discription (s&s used to have one also, but discontinued it years ago.) you might try adjusting the accelerator pump so it squirts less gas in the engine apon accerellating that is the biggest culprit when you see carbon(black soot) in the carb you said you think it is jetting did you buy the bike used? if so ask the old owner what jets were installed and does he have any other jets if you can.

Posted on Jan 19, 2009

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1 Answer

No power when give it gas.


believe carb adjustment bad & carb needs to be rejetted to exhaust, believe you need to add a higher flow gas valve & possibly new plugs & wires

Apr 21, 2014 | 2000 Harley Davidson FLSTF Fat boy

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My kawasaki kx 250 2 stroke is blowin oil out of the exaust an i dont know why


Not uncommon for 2 stroke mx bikes to blow black spooge out of exhuast. I suspect that your sparkplug electrode is black or dark color also and it may even be fouling plugs occasionally. This is cause by a worn or improperly adjusted float valve in the carb and or a worn needle and needle jet. The overall jetting of the bike could be too rich but you should replace any worn parts first before attempting to rejet. Also repack the muffler after repair as the packing is oilsoaked and will continue to drip .

Jan 06, 2013 | Motorcycles

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Hello i bougt a vt1100c shadow with aftermmarket muffelers thay say thare sremin eagal pipes. I dont know the engine back fires as soon you let off the gas or downshift. could rejeting the carbs solve...


When back pressure is reduced on the exhaust system it effects the fuel mixture on a downdraft type of carb. Same as when the air intake is modfied from stock. The carbs are jetted for best performance with factory equipment....rejetting will help if you install the right jets, it can also make it worse if you don't. A vacuum leak will also make it pop through the exhaust.
Hope this helps.

Jul 14, 2011 | 1987 Honda VT 1100 C Shadow

1 Answer

Maved to augusta ga from las vegas nv. my 2004 fatboy when at idle will not stay running without the choke 1/3 out


If your carb is stock, it should have a #45 slow speed jet in it for this area. I'd go to either a #48 or a #50 slow jet. I live in Forsyth, Ga. and I usually put the #48 in most Twin Cam 88 bikes that have changed the exhaust or are popping back out of the carb. If you think this is the problem try changing the jet. I don't know what the altitude is in Las Vegas and I have no idea if Harley rejets the carb for different areas. The CV carb usually is not that sensitive to altitude like the older type carbs were. The Idle Speed Stop Screw is located at the top right of the carb. Turn the inwards (clockwise) to increase the idle speed.

If you bike is fuel injected, you'lll have to take it to a shop to have this problem corrected.

Good Luck
Steve

Feb 11, 2011 | Harley Davidson FLSTF Fat boy Motorcycles

2 Answers

Want to rejet my carb on '07 vt750C2 spirit. Have


to start with you need to purchase a jet kit. it will come with instructions. the stock needle is non adjustable. also you need bigger jets.

Jun 02, 2010 | 2007 Honda VT 750 Shadow

1 Answer

Carb re-jet


I would rejet the carbs. I would go one size up on the jets. That should clear up the problem.

May 07, 2010 | 2000 kawasaki Zephyr 750 RS

1 Answer

1995 FLSTF 80CI Carburator bike not passing emissions


If you're talking about simply adjusting the idle mixture screw, you need to turn the screw inwards to lean it out. But, if you can get to the idle mixture screw, your carb has been modified as this screw has a "anti-tamper" plug covering the screw. The mixture screw is on the back side of the float bowl facing upwards.

More than likely, it sounds as if someone has rejetted the carb. That year model CV carb came with a a #42 slow jet in the carb. The modification to make them run better was to go to a #45 slow jet. This was in the original Keihen 40mm CV type carb. You can try to adjust the mixture screw and see if that allows you to pass. If it doesn't, repost and let us know. Maybe we can help you rejet your carb. Good Luck!

Jan 26, 2010 | Harley Davidson FLSTF - FLSTFI Fat Boy...

2 Answers

Hi mt pit bike is spluttering under acceleration i have tryed to adjust air screw with slight difference but it is still not smooth under power. bike is fk1 125 dont know if valve clearence would be the...


Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.

Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.

Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.

Nov 09, 2009 | 2008 Yamaha Yamaha G5

1 Answer

What do people mean rejetting? rejetting what ur carb?


Re-jetting refers to changing the size of the jet (or jets) within the carb. The jets, for the most part, determine the air/fuel ratio entering the engine, Too small of jets the engine will run lean, run hot and may lack top-end power. Too rich and the engine may have low-end running problems, produce a bit of black smoke, waste fuel and may even foul the spark plug(s). Looking at your spark plugs can give you great in-site as to how the engine is running, rich, lean, burning oil...)
Please see the attached link for your use.

http://www.spark-plugs.co.uk/pages/technical/diagnosis.htm

If you do need to replace the jets you'll need to remove the carb(s) and tear in to them abit; the jets themselves just screw in and out. Take care when handling, their brass and can be damaged easily.

I hope this may have assited you,
Tom

Oct 21, 2009 | 2004 Yamaha DT 125 R

1 Answer

Carb


look at the top of the carb if it is round and held on by 4 phillips screws it is stock keihn if it has a brass screw with what looks like an X leaned at about 45deg, its an S&S if it is a small rectangle with screws on the ends its a mukini you can try to look at the sides of the carb you might see who makes the one you have and any good shop has jets or can get jets why do you think you need to rejet contact us

Jan 11, 2009 | 2001 Harley Davidson FLSTF - FLSTFI Fat...

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