Can you tell me the valve lash specs on a johnson j140px4st outboard motor

SOURCE: relay switch for power tilt for Johnson outboard motor 40HP

Hello jalbin0308, I may can help but "NEED MORE INPUT" said ET. Model, year, HP, ect.

SOURCE: 1974 60hp johnson outboard won't run on full throttle.

Carbs probably need to be cleaned and re-built. Common problem in outboards that havent been run in a while

SOURCE: Boat engine 1995 Johnson Outboard 70 HP

Ihave a 1991 70 hp Johnson outboard thats hard to start the first time but starts good after that. Seems to be flooded. Starting rpm seems to be low.

Dean

• 285 Answers
• Posted on Sep 17, 2009

SOURCE: 40 Hp Johnson outboard motors stalls out after a

May likely be one of two problems:

1. Fuel flow: Make sure fuel tank vent is open and not blocked while engine running. Check primer bulb is working and no air leaks along hose anywhere. Check function of fuel pump and ensure fuel is getting to the cylinders.

2. Overheating: Check engine isn't overheating and that water pump is operating properly while engine is running.

SOURCE: 1974 Johnson 70 hp outboard, quits on acceleration.

It sounds like your motor is starving for fuel. At an idle, you have adequate flow to keep the engine running. When you call for more fuel...you sputter and quit. Could be a clogged filter or trash in the line or in a jet. Yes you will have some air in the bulb, but not a great deal. You could be sucking air at a hose connection (loosing some prime)...try this, start the engine and slowly accererate, have someone pump the bulb as you accelerate, see if the engine works properly while doing this test.