My son has a ktm 50 pro and when he rides it now it acts like it dont fully open up and let the powerband kick in and it has no power and it has problems starting now please help

SOURCE: Ktm 520 2000 Model STARTER PROBLEM

Hi and welcome to FixYa,

Initially, determine if there is a clicking sound when the START button is pressed. The click is significant. If there is, this indicates that the starting relay is engaging but for some reason, the starter motor is not cranking. This could either indicate a faulty starter relay (particularly the contacts) or a faulty starter motor (specifically, the carbon brushes). To determine which:

• with the side covers off, expose the starter relay particularly the 2 large terminals;
• have somebody start the bike normally using the key and button start switch;
• determine if indeed the clicking is coming from the starter relay;
• while the start button is still pressed, jump the 2 big terminals;
• if the engine cranks, then the internal contacts of the starter relay are corroded or burned;
• if the engine will not crank, then the starter motor is faulty.

SOURCE: 06 ktm 50 pro senior bogs after warming up

It sounds like he is running out of fuel in the bowl,poss accelarator pump ?

SOURCE: 2008 ktm 530 hard starting, hard to kick start, remove emissions

If it's a real bugger to kick start, install an 09 cam, works wonders. Go to KTMtalk.com to inquire about emissions removal

SOURCE: problem starting ktm 2006 sxf 250

check inlet valve clearances. they close up making it hard to start exactly as you described. titanium valve coatings wear and ressesion happens quickly,a clean air filter must be maintained to prevent contaniments wearing valve coatings.

SOURCE: 2006 KTM 125 sx high revving out problem

Look into your power valve. If it doesn't operate freely, you won't get peak performance. They can get gummed up.