compression

[oldyam80sg]

Today i took the bike out for a ride because it finally stopped raining!Got home and decided to do a compression check.#1 #2 and #4 cylinders show 145 to 150.#3 will only go to 130.Did not have any oil to squirt in #3 cylinder but according to the Yamaha book 128 is the minimum.What is the next step i should take or is the difference enough to be concerned?What factors go into getting the maximum readings?

[mro]

Higher than stock readings could be from carbon build up.
Lower reading, valve out of adjustment or worn, rings or cilider wear. Add a tea spoon of oil and try again.

If the bike seems to run pretty good....would not worry about it.


mro

[oldyam80sg]

Thanks- just wanted to be sure.When i removed the plugs they looked great.I would like to put at least 1000 miles on it before i put it away-but this year i convinced my Mom that when i leave the bikes in my storage unit i cant always get to them like i should so she said OK why throw all that hard work down the drain leave it in the garage so you can "play" when you visit.

[mro]

cool Mom

mro