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Everything Dirt Bike
General Dirt Bike
Valve Problems!? Urgent advice needed
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<blockquote data-quote="ossagp" data-source="post: 160249" data-attributes="member: 1650"><p>most of mine you would find it difficult at least to turn over by hand even with the spark plug out. depressing the valves is not all that easy. Heck, you might have arms like a real ape for all I know though :-). again the only ktm cam i ever had in my hand wasnt even in an engine. The position you want to assemble in though is with the lobs away from the surface they are going to depress, and this is a different way of describing that than I used before getting a unicam bike. if the lobe is riding under a rocker, you want the lobe down in other words, and if it is on a valve you want the lobe up.</p><p></p><p>now to see if you have bent any valves, take out the spark plug and put a penlight flashlight up to the hole. make sure the valves are at full extension, cam off etc. turn on the flashlight that is in the plug hole, turn out the lights in the room, see if you can look into the exhaust and intake ports and see a light. if you can, you are tearing it down again. if you cant you can go on troubleshooting the timing thing for now, but it is scary as you know to put it together and run it after hearing that sound you described.</p></blockquote><p></p>
[QUOTE="ossagp, post: 160249, member: 1650"] most of mine you would find it difficult at least to turn over by hand even with the spark plug out. depressing the valves is not all that easy. Heck, you might have arms like a real ape for all I know though :-). again the only ktm cam i ever had in my hand wasnt even in an engine. The position you want to assemble in though is with the lobs away from the surface they are going to depress, and this is a different way of describing that than I used before getting a unicam bike. if the lobe is riding under a rocker, you want the lobe down in other words, and if it is on a valve you want the lobe up. now to see if you have bent any valves, take out the spark plug and put a penlight flashlight up to the hole. make sure the valves are at full extension, cam off etc. turn on the flashlight that is in the plug hole, turn out the lights in the room, see if you can look into the exhaust and intake ports and see a light. if you can, you are tearing it down again. if you cant you can go on troubleshooting the timing thing for now, but it is scary as you know to put it together and run it after hearing that sound you described. [/QUOTE]
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Valve Problems!? Urgent advice needed
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