Rebuilding LT80 head and piston
#1
Rebuilding LT80 head and piston
I need to replace a badly scored piston/rings and have the head bored. The piston and head are original equipment on this LT80. Sounds like the LT80 can last for years with a fresh piston and ring job. What size piston and bore will work best? Cylinder head has very fine scratches from bad piston. Traced problem to the 2 cycle oil pump with the plastic gear drive. The gear went bad and the motor received no oil. Any help is appreciated!!
#2
Welcome to the forums.
Pistons come in .5mm increments.
The first overbore is a .5 over. Then 1.0, 1.5, and 2.0
You only need to bore enough to eliminate any damage.
.5 usually does it.
You get the new piston then have a shop bore the cylinder to it.
It sounds like your head is OK. It could be shined up a lil if need be.
I only use Suzuki pistons or Pto-X pistons.
FYI: I've been getting Pro-X's at::
Lytle racing
877-431-8100
You should clean/service the clutchs too.
You can mix fuel/oil at 32:1 and forget about that bad oil pump.
I can get all this done for you if you don't have a local shop.
I also have some freshly bored cylinders here that I can exchange. They are bored to 1.5 over.
Pistons come in .5mm increments.
The first overbore is a .5 over. Then 1.0, 1.5, and 2.0
You only need to bore enough to eliminate any damage.
.5 usually does it.
You get the new piston then have a shop bore the cylinder to it.
It sounds like your head is OK. It could be shined up a lil if need be.
I only use Suzuki pistons or Pto-X pistons.
FYI: I've been getting Pro-X's at::
Lytle racing
877-431-8100
You should clean/service the clutchs too.
You can mix fuel/oil at 32:1 and forget about that bad oil pump.
I can get all this done for you if you don't have a local shop.
I also have some freshly bored cylinders here that I can exchange. They are bored to 1.5 over.
#3
Thanks for the reply Jack. I've done all the work to the LT80 engine with it still installed in the frame. I did notice that there is a collecion of fluid in the lower end of the block which may include pieces of my piston. I'm guessing I should pull the motor to clean out the fluids and foreign garbage. Correct? If I pull the motor, is there anything I should be aware of that may make this a challeng or make it easier? I'm also needing a seat. Would even take a seat pan and make it myself to save some bucks. Any suggestions?
#5
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