What is good compression for a snowmobile?

Is 150 compression good?

150 is realy good compression.

What is good compression on a 2 stroke snowmobile?

A two stroke or ANY internal combustion engine will not fire below 100psi of compression. 100 is VERY low sleds with good motors should be over 120psi and 135-145 is kinda a target number on pump gas that is.

How long do snowmobile engines last?

Snowmobile 2-stroke motors will last 10,000-20000 miles depending on model and how well it is taken care of before they need either a top end rebuild, or a bottom end rebuild. You have about the same chances of blowing the motor at 10 miles as at 7500 miles.

What makes a snowmobile hard to start?

When your sled hasn’t been ran for a while, the gas lines and carbs can dry out, making it difficult to get the sled to start. … When the starting fluid or carb cleaner is sprayed in the intake of the carburetor, the engine should fire, which could then draw the gas through the fuel system.

Is 160 compression good?

You should start to worry if one of your cylinders is getting close to 100 psi. Most new engines in good condition compress at around 175 psi. … (160 x 100) / 175 = 91.4% for the #4 cylinder.

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What is considered low compression?

An engine compression test will tell you if your cylinders have good compression. … As a rule, most engines should have 140 to 160 lbs. Of cranking compression with no more than 10% difference between any of the cylinders. Low compression in one cylinder usually indicates a bad exhaust valve.

How do you increase compression on a snowmobile?

shaving the heads if you pay attention to squish and volume. raising the cylinders by stacking base gaskets in conjunction with a head modification(raises port timing and allows for more cut on the head). just a few alternate ideas to go along keeping the cylinders, pistons, and rings within spec.

How do you do a compression test on a 2 stroke?

How to perform a compression test

  1. Disable fuel supply to the engine.
  2. Disable ignition system.
  3. Remove spark plug.
  4. Install compression tester.
  5. Open the throttle completely.
  6. Turn engine over with starter.
  7. Record highest number achieved and compare with factory specification.
  8. Repeat for each cylinder.

How much is a compression tester?

INNOVA 3612 Compression Tester – 4 Piece Kit

List Price: $39.27 Details
You Save: $9.28 (24%)

How much compression should a Polaris 500 have?

The overall compression should be between 210 and 250 psi per cylinder.