My Off Road Racing

I recently purchased a 2002 ktm lc4 640 to use for desert racing . I was going to purchase a honda xr650r (and still might if I can't overcome the carb troubles with the ktm) I race motorcycles off road the pro level and have been doing so for many years (not factory , just local and district ) I have been running an old xr600 (sherman tank) and decided to finally upgrade to some newer technology. Ok here it goes, I like the ktm overall, but it has a serious problem. Any time I get into any type of rough or choppy sections the bike falls on it's face and will most times want to stall, out or does , like it is running out of fuel. At which time I am almost tossed over the bars from loss of momentum. The bike starts and runs fine as long as the ground is not too rough, but braking bumps , whoops and sharp consecutive right and left corners cause the trouble and in desert racing , this is a major problem. most I have talked to have told me it is a carb float hieght issue. Just though I would ask here to get some other input. All is stock so far on the bike, I haven't added any aftermarket performance parts and won't until I get this issue straightened out. any info would help. I know the suggestions of buying an xr650r are coming , but I would rather make this one work before going out and buying another bike. the 640 seems to be a great bike other than this problem. Thanx ahead of time. I was so pleased to find this — does sound like some form of fuel restriction, possibly merely not jetted proper or needle clip needs to be lowered a notch (to raise the needle). . Also wondering if it might be an ignition breakdown when hitting the shuttering bumps??? Might try trimming the spark plug wire (merely remove the spark plug cap by using an unscrewing motion, take a sharp utility knife and cut 1/4-1/2 inch off end of wire, re-install the spark plug cap using a screwing motion). . best bet would be to post a similar question over at either KTMtalk or ThumperTalk to get much more educated answer from people with similar bikes. . Those are where I go with questions I can't answer on my KTMs (have an '02 520EXC with 540 kit (for sale) and a '05 525EXC plus had an '04 LC4 640 dual sport). . I would have thought an LC4 640 would be extremely heavy for desert racing. . I've owned a bunch of XR500 / 600 / 650s over the years . . Those are hard to beat from a reliability standpoint . . It seems I am forever working on my KTMs to keep in top condition but have such better weight to horsepower ratio and come with all the expensive aftermarket parts already installed. .

From the leaf springs (metal or tree branch) to coil springs or air suspension, the suspension system follows the Newton’s law of motion. Motion law states that each and mostly all body under application of force comes under magnitude and direction. As the moving jeep passes from the road bump or any other hurdle, it experiences a vertical acceleration and then it comes down suddenly because of gravitational force. The suspension system is helpful in reducing up and down movement of the moving jeep, in providing steering stability at the time of cornering the jeep.

Enthusiast adjusts the jeep shock absorbers keeping in mind the driving condition for better performance. In the off road driving situation any riding aspects are enhanced by lifting wheels. Jeep is the most useful vehicle in off driving like snow, sand, mud, rocks, hills, green pastures, logs etc. . . . The off road driving suspension system of the Jeep gives any advantages for the driver of traction, cornering, passing big hurdles and controlling the vehicle.

Performance of the jeep in the mind of a jeep enthusiast is within criteria like horsepower, torque, acceleration and even Jeep Strut Assembly. They love these things at the time of off road driving. Proper suspension settings in the jeep provide ample traction to wheels in rough driving situation. At the time of driving on rocks the vertical energy of the wheels take frame of the jeep up with it and comes down under the effect of earths’ gravitational force. Proper suspension system in the jeep makes it easy by absorbing the verticals energy.

If you follow offroad racing aka CORR, SCORE, BITD and so on. . I was wondering how many of you think Rob Maccachren is the bst offroad driver ever. The only other guys that can come close are Walker Evans and Robby Gordon. Battling it out in Crandon in the late 80's early 90's. MAC RULZ. Today I found out that… My vote go's to Ivan "Ironman" Stewart, this guy has raced it all and pretty much won it all.