Hello everyone, new member here. I've spent many hours searching threads, trying to find my problem before creating a new post. Any direction is much appreciated, I've invested a lot of time, money and parts and this is my last attempt before taking to a shop (all shops near me are running 5 to 7 weeks)
I'll start with my motor - 1996 Johnson 48hp with very low hours but I'm running it with pre-96' controls and the harness adapter from cannon to deutsche. No VRO, I pre-mix and have a pulse pump. Motor has 2 cylinders, compression is 137# on top and 133# bottom.
I re-powered my 86 Boston Whaler with this motor so these issues have been since my first trip out 3 weeks ago.
The motor starts right up but does have a rough idle. Give throttle and she gets on a plane but if you put the throttle past half the motor instantly loses power and hits what feels like a rev limiter, but does not stall. Going back to neutral then to forward will get it out of the rev limiter. One trip for about 3 minutes it ran flawlessly through all rpm's but then started acting like it was running out of fuel - surging power and the primer bulb was flat.
What I've tried this far:
Cleaned carbs twice, replaced fuel lines from tank to carbs, new primer bulb and filter, rebuilt fuel pump, changed primer solenoid with a used one I had on hand, new plugs and wires, set timing and synced carbs to Johnson specs from the manual and a water pump rebuild.
I noticed the primer solenoid was bad (the red lever didn't have a stop point, just spun, and actually pulled completely out of the housing) so I replaced it with a spare I had on hand. After replacing the primer solenoid the motor is the worst it's been. Started but the idle was so low it died once the throttle lever lowered. I raised the idle and tried to water test. Once in gear under load it has zero power. Won't die, just won't go above say 1,500 rpm. My thoughts have been fuel delivery this whole time but there's nothing left to replace or rebuild and she still runs poorly.
Also an intermittent alarm out of the blue and only chimes for a split second then goes away.
Sorry for the long winded post, I just wanted to give as much detail as possible. Thanks in advance for any advice!
Kevin
I'll start with my motor - 1996 Johnson 48hp with very low hours but I'm running it with pre-96' controls and the harness adapter from cannon to deutsche. No VRO, I pre-mix and have a pulse pump. Motor has 2 cylinders, compression is 137# on top and 133# bottom.
I re-powered my 86 Boston Whaler with this motor so these issues have been since my first trip out 3 weeks ago.
The motor starts right up but does have a rough idle. Give throttle and she gets on a plane but if you put the throttle past half the motor instantly loses power and hits what feels like a rev limiter, but does not stall. Going back to neutral then to forward will get it out of the rev limiter. One trip for about 3 minutes it ran flawlessly through all rpm's but then started acting like it was running out of fuel - surging power and the primer bulb was flat.
What I've tried this far:
Cleaned carbs twice, replaced fuel lines from tank to carbs, new primer bulb and filter, rebuilt fuel pump, changed primer solenoid with a used one I had on hand, new plugs and wires, set timing and synced carbs to Johnson specs from the manual and a water pump rebuild.
I noticed the primer solenoid was bad (the red lever didn't have a stop point, just spun, and actually pulled completely out of the housing) so I replaced it with a spare I had on hand. After replacing the primer solenoid the motor is the worst it's been. Started but the idle was so low it died once the throttle lever lowered. I raised the idle and tried to water test. Once in gear under load it has zero power. Won't die, just won't go above say 1,500 rpm. My thoughts have been fuel delivery this whole time but there's nothing left to replace or rebuild and she still runs poorly.
Also an intermittent alarm out of the blue and only chimes for a split second then goes away.
Sorry for the long winded post, I just wanted to give as much detail as possible. Thanks in advance for any advice!
Kevin
