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Crankshaft Question?

  • Thread starter Thread starter GSJimbo
  • Start date Start date
G

GSJimbo

Guest
I was wondering does #1 and #4 piston fire at the same time? and the same with #2 and #3, I took off the head of my sick running GS1100 and noticed #1 piston is about 3/4 of a inch lower in the hole than #4, its flush with cylinder, the crank is set on TDC on the ignition side (T), my question is, is my crankshaft twisted??? Its not welded.......Thanks :?
 
That sounds bad. #1 and #4 fire at the same time so they should be flush with the top of the block at the same time. Same goes for #2 and #3.
 
You can kinda tell here. At least you can see 2+3 are at the exact same height.
rebuild4.jpg
 
:o Thanks Ryan, Thats what I thought, looks like I'm in the market for a crank!!!!!!!!
 
they do not fire at the same time, they do rise and fall together but they fire 360 degrees apart
the firing order is 1,2,4,3
when 1 fires, 4 is at top dead center finishing the exhaust stroke and starting the intake stroke.

your crank is twisted!!
have you been racing? and over revved it?
 
There is a wasted spark that does not do anything on one of the cylinders as it on the exhaust stroke.
 
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