JerrfyLube
Seaman
- Joined
- Jan 16, 2009
- Messages
- 53
1957 Johnson 35HP SeaHorse...
Did the first real run on this motor a few days ago. Regular unleaded fuel, Valvoline Outboard oil(TC-W3 compliant) at 24:1. Ran it for about 30-45 mins at WOT and cruising speeds and it ran great. When we were idling back to the docks, it started to sputter and was only running on one cylinder. Today, i tried to get it running in a bucket and heres what im finding. Spark is very good on both cylinders. Plugs look good...nice and tan. Compression is 119 on the top, 115 on the bottom. When you first start the motor, it would run on both cylinders for about 2-3 seconds, then the bottom cylinder would die but it would remain running, although, a little rough. I confirmed it was the bottom cylinder by pulling the plug wire.
Its got good spark, good compression and good fuel. What gives?
Did the first real run on this motor a few days ago. Regular unleaded fuel, Valvoline Outboard oil(TC-W3 compliant) at 24:1. Ran it for about 30-45 mins at WOT and cruising speeds and it ran great. When we were idling back to the docks, it started to sputter and was only running on one cylinder. Today, i tried to get it running in a bucket and heres what im finding. Spark is very good on both cylinders. Plugs look good...nice and tan. Compression is 119 on the top, 115 on the bottom. When you first start the motor, it would run on both cylinders for about 2-3 seconds, then the bottom cylinder would die but it would remain running, although, a little rough. I confirmed it was the bottom cylinder by pulling the plug wire.
Its got good spark, good compression and good fuel. What gives?