KTM 250 SX-F timing is off. help please.....
Posted October 29, 2007 - 11:30 AM
Posted November 09, 2007 - 07:01 PM
Posted November 09, 2007 - 11:59 PM
with the cams lined up, it should fall into place.
Posted November 12, 2007 - 08:32 AM
Remove the left side case/magneto cover, the flywheel has a small block of steel welded to its outer edge. Turn the crank so that blocks right edge matches the left edge of the pulse coil (small black box). That is TDC. Now go back to the right and shine a flash light in the hole, move the crank very slightly if needed to get the notch in the crank right under the hole, now screw the bolt it without the washer until it contacts the crank, unscrew it very slightly, like 1/8 turn, now rock the crank forward & back to find the middle, turn the bolt in while a helper rocks the crank, Now you are indexed at TDC and can proceed with cam timing marks.
As you work on this avoid removing the cam chain tensioner! That is another whole level of instructions that if botched it will cost you a grand plus to start the engine
Posted November 14, 2007 - 11:53 AM
Ps, if your left hand casing gasket is missing, the bike will not start even though it turns over (stiffly). So you'll need to save your old gasket or get a new one.
To do the cam chain tensioner correcty.
Take a 21mm ring spanner and remove the nut that face forward on the outside of the cyclinder head on its right hand side.(slightly covered by rad hose). When you have the tensioner out, you compress it the whole way so only about 2mm of the inner shaft are showing.
It should stay like this.(its got a ratchet system)
When you are reinstalling the tensioner put it back in (fully compressed) and tighten the nut not forgetting the o-ring and copper washer make sure the timing is spot on, and with a long flat head screw driver push against the tensioner. It will release and extend to the correct tension against the cam chain.
Posted November 16, 2007 - 06:37 PM
Posted November 16, 2007 - 06:49 PM
Posted November 19, 2007 - 01:21 PM
Glad you got is sorted, they're a great motor, I can only hope my new kxf 450 will be as good.
I'd 100 hours on the ktm an never adjusted as much as a shim!