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LT 80 lacking vacuum

  #11  
Old 11-21-2018, 01:03 AM
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I've not had to do a leak down in 20 years. I replace the seals. They are like 3 bucks each. IMO, your time would be better spent changing the seals. Then we can do the top end.
 
  #12  
Old 11-21-2018, 03:57 AM
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"I've not had to do a leak down in 20 years."

I agree, I have never done a leak down test. What does it tell you that a compression test doesn't? Yes, possibly what is causing loss of compression, but you find that out anyway when you take the head and cylinder off.
 
  #13  
Old 11-21-2018, 09:18 AM
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Merryman, "It was lightly seized because the oil injector had failed." This is why I'd like a compression test.
A compression test checks the compression of the motor (checks piston/cylinder).
A leak down test checks for a leak in the bottom end (seals/gaskets).
 
  #14  
Old 11-21-2018, 10:15 AM
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reply, ya Ill go ahead and put new seals, and then do comp test.
is it only the left and right crank seals that I need to change?
are there any more that could cause vaccum leak on bottom end?
thanks for the advice.
cheers
T
 
  #15  
Old 11-21-2018, 10:28 AM
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Where the cases join.. which usually never ever happens.
Left and right seals. I use Suzuki parts They only like 3 bucks each.. I do not like the aftermarket seals.
 
  #16  
Old 11-21-2018, 10:33 AM
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ok thanks,
I suppose the bearings wont come out without the case being split?
are they usually worth doing same time or ?
 
  #17  
Old 11-21-2018, 01:37 PM
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They would if you needed to split the cases. Thankfully you don't need to. I wouldn't split the cases for bearings at this point. All this stuff can be done with the motor in frame. You can spin the crank (as you are going to have the top end off anyways) if it feels like rocks in it, then you would need to do the bearings.

The seals simply push in from the outside. You will need a puller to pull the flywheel (rt seal is behind it).. The left seal is behind the front clutch.
FYI: some say there is 2 part numbers for right/left seals. Both are identical and I have no clue as to why there are 2 part numbers.
 
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