Bizzy13
XS400 Addict
So what's all the 81 owners running for valve clearance?! I can't seem to find consistent numbers.
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Valve lash
- Thread starter Bizzy13
- Start date
Me either I find numbers from .004 mm intake to .007 exhaust.
Manual says
.08-12 intakes
.16-.20 exhaust
Manual says
.08-12 intakes
.16-.20 exhaust
Bizzy13
XS400 Addict
Clymer said .008 exhaust .0035 intake!!! Can't be right! What do you have yours at? And what manual are you referring to?
This manual here
http://www.xs400.com/forum/showthread.php?t=10677|
Those numbers you have are way off.
Im in the process of tring to adjust my valve lash at the time of this thread.
http://www.xs400.com/forum/showthread.php?t=10677|
Those numbers you have are way off.
Im in the process of tring to adjust my valve lash at the time of this thread.
Bizzy13
XS400 Addict
Currently Im at .004 & .008 and its not running very well at all.
inlet (carb side) is 0.08 - 0.12 mm
exhaust 0.16 - 0.20mm
This what Im consistantly finding,I would find a happy medium as you its better to have the valve lash too loose than too tight.
exhaust 0.16 - 0.20mm
This what Im consistantly finding,I would find a happy medium as you its better to have the valve lash too loose than too tight.
Bizzy13
XS400 Addict
That's right where I'm at, .004 and .008 (inches) I guess my problems lye elsewhere.
What does the bike sound like at these figures?Seems to me you have your intake right at the minimim of the specs.From all the reading I have been doing on this topic its said better to have them loose than tight.If theres not enough free play in the valve lash, the valve can possible get hot enough to burn if the heat isnt allowed to dissapate.
Im going to do mine later
Im going to do mine later
Bizzy13
XS400 Addict
Tapping and smoking on right, nasty loping sound in left
Bizzy13
XS400 Addict
Actually opposite way around
I don't believe your valve lash is set up properly,or the specs are wrong and out of adjustment.
My problem is when I get to step 2 I turn the engne over tdc with LT at the pointer and both valves are closed,the lash is not even on both sides.I set the adjustment for .08 intake and .16 exhaust.Then Im having a difficult time trying to get my feeler gauges bent at the proper angle to get underneath the tappet screw.Also Im haing an extremely difficult time keeping the LT at the pointer without it moving.I know theres a trick to this I read about it on other threads.If this isnt going bad enough my back is in extremely severe pain today.At this point Im taking a break and will try again later this evening.Im almost getting to the point Im going to say F it! and pay somebody to do this job for me.
My problem is when I get to step 2 I turn the engne over tdc with LT at the pointer and both valves are closed,the lash is not even on both sides.I set the adjustment for .08 intake and .16 exhaust.Then Im having a difficult time trying to get my feeler gauges bent at the proper angle to get underneath the tappet screw.Also Im haing an extremely difficult time keeping the LT at the pointer without it moving.I know theres a trick to this I read about it on other threads.If this isnt going bad enough my back is in extremely severe pain today.At this point Im taking a break and will try again later this evening.Im almost getting to the point Im going to say F it! and pay somebody to do this job for me.
Last edited:
Bizzy13
XS400 Addict
It does want to swing past the mark because its on the compression stroke. I leave the wrench on the nut and attach my jack handle to the end of it to counter weight it, lol. I have forward controls so the wedging it under the foot peg trick doesn't work.
Robsteeler66
XS400 Addict
My new Haynes manual has these same values, so I think the Clymer must be off. Does anyone have the Yamaha factory manual to be certain?
Bizzy13
XS400 Addict
The factory 81 manual on this site has those same specs.
Im glad after all the confusion about the numbers It looks like we have a winner.
0.08 - 0.12 mm
exhaust 0.16 - 0.20mm
0.08 - 0.12 mm
exhaust 0.16 - 0.20mm
Bizzy13
XS400 Addict
Bout damn time! Lol Now if we can figure out these run away idle situations we'll be making some progress!!!
I'm going .12 & .20 this Saturday. Hope it helps. I have a rather large list of maintenance to do Sat.
I'm going .12 & .20 this Saturday. Hope it helps. I have a rather large list of maintenance to do Sat.
Robsteeler66
XS400 Addict
Good luck Bizzy. I haven't delved that far into my maintenance yet. I will feel good if I can put on my new cables and change the tires!
Bizzy13
XS400 Addict
Thanks msn
Well guys wish me luck I think I have finaly got this task done right!Between health issues and heat exhaustion I got them adjusted tonight.Had some help from the mirs holding the engine at TDC on both sides.Going to do a double check tomorrow and slap the beast back together and fire it up.
Bizzy13
XS400 Addict
Sweet bro!
