ContinuousWave   Whaler   Moderated Discussion Areas   ContinuousWave: Whaler Performance   High Compression on 2000 Johnson 130 HP    search | FAQ | profile | register | author help

Author	Topic:   High Compression on 2000 Johnson 130 HP
mb159	posted 05-09-2014 08:55 AM ET (US)         Is there any such thing as compression being TOO high on a two-stroke outboard? I am looking at a 2000 Johnson Ocean Pro 130 HP that shows 140 lbs. on three cylinders and 145 lbs. on the fourth.... Is this TOO much?
Peter	posted 05-09-2014 10:15 AM ET (US)             I had a 1985 Johnson 140, V4 Looper and its compression was 130 +/- 3 in all cylinders. The exact number very much depends on the gauge and so I would not worry about the number as it appears to be in range. The more important indicator is how even the compression is between each cylinder and in your case it all looks good. The V4 Looper motors were known to be good and nearly bullet proof.
crbenny	posted 05-10-2014 08:55 AM ET (US)             Excessive carbon buildup on piston crowns will raise compression ratio. Due carb and check again. Chris
crbenny	posted 05-10-2014 08:56 AM ET (US)             Decarb.. Computer corrected me incorrectly.

Hop to: ContinuousWave: The Whaler GAM or General AreaContinuousWave: Whaler MarketplaceContinuousWave: Whaler Repairs/ModsContinuousWave: Whaler PerformanceContinuousWave: Small Boat ElectricalContinuousWave: Trips and Rendezvous