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Old 02-23-2010, 08:50 PM   #1 (permalink)
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300ex valve adjusting

Alright i finally got my jetting correct and everythings good there but now the valves are tapping more than i ever remember them doing before. I thinks its cuz i ran it way lean for just a little bit but refresh my memory what are the specs for adjusting the valves?
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Old 02-23-2010, 09:01 PM   #2 (permalink)
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.004 Is what the 250X are and the 300EX is basically the same, pull the timing plug out rais and support the rearend I usually put mine in 3rd or 4th so I can bump the wheels around by grabbing one and turning it line up the line above the "T" and start adjusting. good luck. oh and when you get it to the "T" you may have to hold the tire in place you can try to get it to neutral without it moving but not likely. an extra set of hands will be a good thing.
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Old 02-24-2010, 05:31 AM   #3 (permalink)
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K Thanks bro. Do u kno if running it lean for a little while could cause my valves to go out of adjustment all of the sudden or could i have another problem internally? Cuz i just had them adjusted professionally and they were only good for a little while?
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05 400ex
Hmf slip-on
42 pilot, mixture 2 3/4 turns, 165 main
razr2 rear tires, hole shot fronts
tusk nerfs and gas cap? LoL
Mod quad dash and riser
Rental fat bars
Acerbies hand guards.
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Old 02-24-2010, 06:41 AM   #4 (permalink)
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running lean will actually burn a piston I'm not sure on the valves I would think it would have a little bearing on their performance.? I dont' think you messed anything up just re-adjust them and try it for a littlewhille
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Old 02-24-2010, 12:46 PM   #5 (permalink)
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Yeah, and make sure you tighten the lock nuts down good. When you had them adjusted, they may not have tightened them good.
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Old 02-24-2010, 01:02 PM   #6 (permalink)
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Quote:
Originally Posted by Helmut View Post
Yeah, and make sure you tighten the lock nuts down good. When you had them adjusted, they may not have tightened them good.
Seen that before...lol not a pretty outcome on a car anyway...lol
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Old 02-24-2010, 01:09 PM   #7 (permalink)
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400EX-300EX Valve Adjustment
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Old 02-24-2010, 05:15 PM   #8 (permalink)
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just make sure you got the T mark on the compression stroke..and not the ex stroke !!!..or you can kiss that top end goodbye..lol
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Old 02-24-2010, 06:00 PM   #9 (permalink)
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K i adjusted them 2 spec and they still tap alittle more than i like. I mean a noticable tap tap tap and it gets faster when i ride around.
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05 400ex
Hmf slip-on
42 pilot, mixture 2 3/4 turns, 165 main
razr2 rear tires, hole shot fronts
tusk nerfs and gas cap? LoL
Mod quad dash and riser
Rental fat bars
Acerbies hand guards.
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Old 02-24-2010, 06:03 PM   #10 (permalink)
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Could be a worn bearing then or a worn cam or rockers.
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