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Where is the oil going?

  • Thread starter Thread starter flyingace
  • Start date Start date
TheCafeKid said:
They dont sound rediculously low to me, and they're well above service limits. Remember that pistons are generally NOT exactly the same size, and thats part of the reason the rings are springy to begin with. At any rate, I do have a concern, and it may be way off, but I THOUGHT that i remembered reading in my various manuals that if the cylinders were a certain percentage apart from eachother in compression, that there may be a problem. Im not possitive, but you may want to check that out. While they are all above service limits, they may be bellow the required compression in relation to eachother. This sort of makes sense to me in my head, as if your cylinders compression is alot higher on one or more than another or more, the crank may be loaded unevenly, resulting in issues. Plus the cylinders may load up to the point where it seems to lope when it hits a low cylinder vs a high one. In which case you may have a cylinder wall issue, or a valve seating issue? Im not sure again, so you might want to investigate that theory.

TCK
Click to expand...

The Haynes manual has something like compression between 120-170 with no more than a 28 PSI difference between high and low.

Just to clarify, my rings are new but a complete ring job was not done. I mixed/matched pistons from this and another bike until I got within spec. Then roughed up the cylinders and installed $25 EBay rings. That represents the total cost - $25. I think the readings are pretty respectable after 15K miles considering the shade tree factor.
 
flyingace said:
The Haynes manual has something like compression between 120-170 with no more than a 28 PSI difference between high and low.

Just to clarify, my rings are new but a complete ring job was not done. I mixed/matched pistons from this and another bike until I got within spec. Then roughed up the cylinders and installed $25 EBay rings. That represents the total cost - $25. I think the readings are pretty respectable after 15K miles considering the shade tree factor.
Click to expand...
Definately respectable. I wouldnt consider myself much more than an adequately experienced shade tree mechanic myself. I am by far no expert. But, this time last year, I didnt even know more than adjusting the valves. Now i can pull a top end apart and rebuild it and have the bike running in an afternoon. Its not tough, once you know what you are looking at. If you gather all the necessary parts, you could start in the morning, and be taking it out for a shakedown run before dinner. I have yet to crack the cases on a GS, but i have seen many jobs done via pictures, and feel pretty confident i could do it rather easily as well. Getting them apart to begin with seems the hardest part to me. If i have the time between or after all the other projects I have on the board for this winter, I may just be pulling a GK motor apart and replacing or shimming out the bevel gears and perhaps getting the tranny back cut. Who knows. It really is quite a relief to be somewhat confident in this stuff tho, simply because I know that other than finding the parts i need to repair it, if something on any of my bikes break, I can generally fix it. Makes one not so timid about crackin the whip on em... :D
 
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