Topic: Would you notice a stuck/sticky valve when adjusting tappets ?

[greenjeans]

1969 CB750K

Wouldn't you ?     When you check them with the gauges, the valves are closed fully correct ?
Also - to get a feeler gauge in there the tappet has some give/wiggle - closed valves.   If they are open there should be no movement/wiggle to the tappets ? correct ?

Still have a warm #3 pipe.   Getting spark.   Carbs have been cleaned thoroughly - although I'm starting to think I'm going to go through them again.   

I'm at a loss here. 

[dave500]

the valves are closed,there will be some wiggle or the feeler wont go in,if the valve is sticky or stuck slightly open the wiggle will be more,a leak down test is best if you think you have a sticky valve,even just hook up an airline into that cylinder,you might not notice a sticky valve depending on where its stuck or sticky?so what symptoms are you worried about?

[Terry in Australia]

Yep, +1 on what Dave just said, have you done a compression test mate? Could be that you've got a burned exhaust valve. Cheers, Terry.

[dave500]

if a valve sticks or dosent seat fully itll burn,or if the tappet is way too tight and it rides,its like an oxy cutting torch blowing over the bad seat area if its the exhaust one,a chuff chuff from the inlet if thats the culprit,youll have a bad misfire feel and real low power.

[greenjeans]

well - I'm on the original tires (the new ones should show up this morning.)      This thing fires right up an idles well.  It does not seem like there is lost power - although I really haven't pushed it too much for fear of the tires shredding.    It does seem like there is some sputtering/missing, but it seems to catch itself and accelerate like a bat-outta-hell.   

When I set the tappets originally, most of them were dead on - didn't need much adjustment at all.   

Coils, wires and plugs are new.  Carbs cleaned thoroughly, floats set.  Getting gas.  Getting spark. 

Guess I'll go find a compression checker and see what happens.

The symptoms that I have are an exhaust pipe that is warm to hot  -  not nearly as hot as the others.  The #3 pipe also has much more pressure coming out of it a scompared to the others.   (pipes are brand new HM300s)

[markb]

For what it's worth, on my K0 I had one cylinder that ran cooler than the other three and the plug kept fouling out.  It ran good until that happened.  New plug and it ran great again for 50 miles or so.  I did all the usual stuff, carbs, etc., and finally tore it down to the case a year ago.  Couldn't really see anything that would cause it but had a valve job done while I was at it.  The engine only had a few hundred miles on it since the previous rebuild so I used the same rings and pistons with honing.  Didn't do anything else except put it back together and the problem went away.