Posted July 23, 201014 yr I checked and rechecked my measurements, but as you can hear the valves are rather loud. Let me know what you think.
July 23, 201014 yr did you measure when the bike was warm or cold, if the measurements you used are for a cold engine and you done them hot they will be to wide.
July 23, 201014 yr Author did you measure when the bike was warm or cold, if the measurements you used are for a cold engine and you done them hot they will be to wide. Yup, they were done cold.
July 23, 201014 yr They sound a little loud to me, but microphones can be deceiving. Sounds louder on left than right. I always hear mine, but it sounds lighter than that and is almost gone at speed. What weight of oil are you using?
July 23, 201014 yr The first thing I would do is double check the measurements there are a lot of xs owners on here,and I am sure one will be able to help soon. But it does sound that they are gapped to wide. Does the bike get any quieter as it warms up?
July 23, 201014 yr Author The first thing I would do is double check the measurements there are a lot of xs owners on here,and I am sure one will be able to help soon. But it does sound that they are gapped to wide. Does the bike get any quieter as it warms up? Nope, that is with the bike warmed up.
July 23, 201014 yr did you try to do the valves because they were noisy, or is this the result of adjusting them
July 23, 201014 yr Author did you try to do the valves because they were noisy, or is this the result of adjusting them This is the result of adjusting them. I would have to say that I had to loosen them for it to be in spec.
July 23, 201014 yr thats as i thought, give me the exact model and year and i will ring yamaha tomorrow and get the measurements to confirm the ones you are using are correct.it doesnt take much of an over gap to sound like a bag of nails, your feeler gauge should slip through with a slight resistance.
July 23, 201014 yr Author thats as i thought, give me the exact model and year and i will ring yamaha tomorrow and get the measurements to confirm the ones you are using are correct.it doesnt take much of an over gap to sound like a bag of nails, your feeler gauge should slip through with a slight resistance. Thank you for the offer, but I've been using a Haynes manual, and have set it to the lowest measurement. .003 intake .006 exhaust
July 23, 201014 yr Moderator does sound loud, could be wear in the adjusters causing wrong readings. The adjuster ends hammers the top of the valve stem and it dishes, causing you to measure the crown of the depression but not the actual gap drewps
July 23, 201014 yr Author does sound loud, could be wear in the adjusters causing wrong readings. The adjuster ends hammers the top of the valve stem and it dishes, causing you to measure the crown of the depression but not the actual gap drewps What actions do you recommend, if wear is causing inaccurate measurements?
July 23, 201014 yr Thank you for the offer, but I've been using a Haynes manual, and have set it to the lowest measurement. .003 intake .006 exhaust I've had a couple xs400's and don't recall the valves being that noisey(but, then, I sometimes forget what I've gone out to the garage for!), altho, as mentioned above, the microphone may accentuate the noise. I forgot how the valves are opened...thru a rocker arm from the cam in the head? Could the rocker arms &/or shfts be worn? You might try using a stethoscope (long screwdriver works!) or length of hose to listen to various areas around the engine to be sure noise is coming from the valves
July 23, 201014 yr Moderator does sound noisy, could be that there is wear on the adjusters squewing the gaps (ie its dished, but your feelers are measuring the crown of the wear)
July 23, 201014 yr Author does sound noisy, could be that there is wear on the adjusters squewing the gaps (ie its dished, but your feelers are measuring the crown of the wear) LOL, isn't this the same thing you posted above? I was just wondering if purchasing new adjusters would give me better measurements, or if I should just try and tighten them a bit?
July 23, 201014 yr Moderator LOL, isn't this the same thing you posted above? I was just wondering if purchasing new adjusters would give me better measurements, or if I should just try and tighten them a bit? bloody computer, the connections crap and I thought it didn't go through adjusters are cheap enough, I'd give it a go
July 23, 201014 yr Author bloody computer, the connections crap and I thought it didn't go through adjusters are cheap enough, I'd give it a go I will do just that, thanks!
July 23, 201014 yr Author And done, just bought them. Is this going to be easy to do, as I can do it without taking the top part of the engine off?
July 23, 201014 yr Moderator And done, just bought them. Is this going to be easy to do, as I can do it without taking the top part of the engine off? yep, just don't drop them in there
July 23, 201014 yr Author yep, just don't drop them in there You know, now I'm going to worry about that the whole time I'm working on them. It was bad enough when one of my feeler gauge tips snapped off, and it just happen to shoot out of the engine, instead of in.
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