Question about 2002 KTM LC4 640 Adventure

1 Answer

Slow I bought this bike last year and I love it but I can tell the motor is holding back a lot of power. All that I have done is removed the snorkel from the air box. What else do I need to do to make this pig fly???? I noticed there is a resinator on the exaust system is it worth my time to figure out a bypass or should I just by a new pip???

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 2,336 Answers

It may not run good with the snorkle taken out and no rejetting. Start with a 160 jet for sealevel. I have left my needle alone but I ride from 4-8 thousand feet. I am running a 157 main jet. Also turn the air screw out to 2+ turns. If yo don't want to buy a pipe the easiest thing is to remove the disks and dril three or four 1/2 inch holes around the existing hole in the back plate of the mufler then replace the disks. There are some more exotic ways of doing this but this accomplishes exactly the asme thing. I tried runnning without the airbox side plate to see if it would be better than just the snorkle removed and could not tell any difference other than noise. I also drilled my slide out as many have recommended for throttle response but again I could tell no difference at all. It didn't hurt but it didn't help. Use Mobil1 15/50 or synthetic motorcycle oil. I use the car oil. The clutch worries are not real with synthetic oil unless you use one that has friction modifiers. Mobil 1 15/50 does not. It will shift noticably better with synthetic oil.,,,

Posted on Nov 10, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Timing chain 1998 4000cc sohc motor

The way to find out would be to see if the bolts holding the timing chain cover have marks from a socket been on them.

Dec 15, 2012 | 1998 Ford Explorer

1 Answer

1999 Suzuki GSXR 600 turns over extremely slow

Hi, Sharon my gut tells me you may have a faulty battery ground cable connection to the frame or engine case or your starter relay, starter solenoid, starter motor are being given last rites for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Suzuki, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Sluggish Start Bad Starter Suzuki GSX Motorcycle Forums Gixxer com
2010 GSXR600 won start
Suzuki 2001 GSX R600 Service Manual
OEM parts for Suzuki
Suzuki GSX R600 2003 Owner Manual

May 07, 2017 | 1999 Suzuki GSX-R 600

1 Answer

Hi I own a Transalp that I bought in UK . a couple of years ago I emmigrated to South Africa and took the bike there. However over the last year and a half I have been working in Asia and the bike has been...

hi, first thing you should do would be, to remove the fuel from the exhaust, you may have to remove it to do this, it must be that while the bike was standing the fuel has leaked from the tank, through a sticking float valve, into the engine through the inlet valve which must have been open at the time, and filled the cylinder with fuel, when your friend has attempted to start the bike the fuel has been blown into the exhaust, and lay here untill the bike fired and run, this is most common on two stroke engines, normaly a four stroke in this position would hydrallic,

the fuel will eventualy clear as the bike is running,

your best bet would be to remove the float bowl from the carburettor, and check the opperation of the fuel cut off valve, this may have become contaminated by old fuel which forms a varnish type substance when allowed to stand,
the cut off valve is located under the float which you will carefully remove, place a clean cloth or similar under the carb where you are working, if any parts fall onto the paper, you will quickly find them, i hope this advice is clear and meaning full, if you require any further help , feel free to contact me , paul

Feb 24, 2011 | 2001 Honda XL 650 V Transalp

2 Answers

How do remove the fan blade from a model fas256n2a

You'll need to turn off the power and remove the top that holds the fan motor on the unit. After you get it out try to clean up the shaft if it's rusty with some sand paper then loosen the set screw on the fan hub. You will probably need some type of puller to get the fan blades off the motor shaft. Let me know if you have questions.

May 24, 2010 | Frigidaire FAS256N2A Air Conditioner

1 Answer

I bought this snorkel used and put it in my bathtub last night and it filled with water. The lower chamber is filling to the point I can't even blow it out. Is there something I don't know?

From what you've described, you have a self-draining snorkel (at least it would be if working correctly). There will be a simple diaphragm valve at the lowest point of the snorkel, it's usually made of a silicone rubber disc and in use is held closed by external water pressure. It can also be held open if there is any grit or sand in it, if it is damaged or if it's simply hardened with age.

All you can do is clean it and make sure it seats correctly. If it has failed in any way or if the diaphragm is simply missing then buy a new snorkel as they don't need to be expensive.

There's a good reason that many divers still prefer a simple j-tube snorkel and it's because there is nothing to go wrong. I personally do use a self-draining snorkel but I'm careful to inspect and clean the valve before and after every use and always have a spare snorkel in my dive bag.

On an unrelated matter, if the snorkel has any kind of device on the open end to prevent water from entering then I strongly recommend that you remove it. They're restrictive to airflow and are potentially dangerous. There is no substitute for simplicity and for learning to use a snorkel correctly.

Jul 09, 2009 | Tabata Usa Tusa Snorkeling Two Window...

1 Answer

Bike backfires,dies,restarts runs fine

your carbs are dirty. and probably need to be balanced also... bring the bike bto a garage and have them cleaned by a profesional.... also after market pipes don't give your bike the proper back pressure .. that can mess up your carbs timing

Jun 16, 2009 | 1996 kawasaki VN 1500 Vulcan Classic

1 Answer


try saving the things you want to print as a pdf file, then print them from there

Jun 01, 2009 | HP DeskJet 3550 InkJet Printer

1 Answer

How do you replace rear bumper cover on 2009 Honda Civic

Should look for the bumper shocks and remove which ever is easiest, remove bumper then remove cover , replace cover and reinstall bumper, watch out for wires and clips might hold cover to side plastic.

May 24, 2017 | 2009 Honda Civic

3 Answers

94 chevy s10 blazer power windows not working

I had the same problem - driver side fine, passenger side front not working/slow or the back seat. You need to replace the window motor on the passenger side. Yes, there are two motors. It's pretty simple if you are handy with some tools. The hardest part is getting the 4 mounts that hold the window motor to the door off. The are factory riveted to the door, so I had to grind the outsides off and tap them out. Just watch the spring lever that holds the window bar for going up and down. I didn't pay attention and it snapped back - nearly broke my thumb.


Feb 28, 2009 | 1994 Chevrolet S-10

1 Answer

Magna engine surges

The carbs may need to be cleaned. Try running seafoam in the tank first and see if that clears some of it up. The slow jets may be plugged up inside the carbs. If the snorkel had been removed from the airbox, it could cause siminlar problems as well. have you changed the spark plugs yet? be sure to check out the Honda Magna forums for more info:

Feb 27, 2009 | 1999 Honda V-Twin Magna

Not finding what you are looking for?
2002 KTM LC4 640 Adventure Logo

Related Topics:

155 people viewed this question

Ask a Question

Usually answered in minutes!

Top KTM Experts


Level 3 Expert

77499 Answers


Level 2 Expert

342 Answers

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers

Are you a KTM Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides