'96 Johnson 200HP - loss of power under load

tak

Recruit
Joined
Jul 25, 2003
Messages
1
Continuation of previous posting. Sorry, I pushed the wrong key.<br /><br />Things that have been tried:<br /><br />01 Primer bulb was squeezed, when motor was bogging down, but no improvement.<br />02 Primer bulb was checked. The bulb gets hard after approx. 4 squeezes.<br />03 Disconnected the fuel line, just before the VRO fuel/oil pump, and installed a portable gas tank with new fuel and primer bulb - no improvement.<br />04 Disconnected the fuel line, just after the primer solenoid, and squeezed the primer bulb. A good supply of fuel exited the line.<br />05 Replaced the in-line filter. Filter had some dirt.<br />06 Replaced the fuel/water separtor.<br />07 Replaced the spark plugs. All plugs were wet.<br />08 Removed the main high speed jets. Jets were clean. With each jet removed, the primer bulb was squeezed to see if any contaminates could be flushed out of the carburetor bowls. Fuel appeared to be contaminate free.<br />09 Checked spark timing linkage. The linkage looks good - works well when throttle is advanced.<br />10 Performed a pressure test of the VRO pump unit. The pressure gauge was not suitable for low pressure tests but 1 psi @ 600 rpm was confirmed. Higher pressure readings for higher rpms were witnessed but not recorded due to lack of accurate tachometer and proper pressure gauge.<br />11 A vacuum test was not performed because we by-passed the main fuel lines, fittings and valves when we connected the portable fuel tank.<br />12 Compression test was run. All cylinders tested out at 98 to 100 psi except 92 psi for cylinger # 6.<br /><br />Note:<br /><br />With the boat (23' Sea Ox) in a slip and no trailer, testing methods are limited. I do have a test propeller, consquently I can not run the motor at high rpm's in the slip. <br /><br />Questions:<br /><br />Should the ignition system be looked at? Is there any other procedures that I can perform before I throw in the towel and take it to a mechanic?
 

ob

Admiral
Joined
Aug 16, 2002
Messages
6,992
Re: '96 Johnson 200HP - loss of power under load

You say you disconnected fuel line just after solenoid and squeezed the primer bulb and got a good flow of fuel.Unless you had the primer solenoid lever in the manual prime position it should not pass any fuel until the key switch is pushed in energizing the solenoid.Maybe what you had disconnected was the fuel inlet to solenoid primer.If indeed you did disconnect the primer discharge line and got a good flow of fuel while squeezing primer bulb,and key switch was not pushed in,the solenoid primer is defective.<br /><br />Try running the engine and when it will not get up on step,repeatedly push in on the key switch energizing primer solenoid and see if engine picks up.If so ,you have a fuel delivery problem through carbs.
 
Top