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Hi everyone,
New poster here. I bought back our once original 1987 18' Manatee with a 1987 Johnson 90 VRO V4 outboard. We purchased this new in 1987, sold it in 1991. Anyway, I found the entire package and bought it back. Lengthy post!
Finally took the boat out on the river(, and of course, it doesn't run correctly. Wouldn't even idle without engaging the primer solenoid (push in the key).
So, I bought the repair manuals, a carb rebuild kit, and tore the carbs apart.
(Also, the previous owner removed the VRO pump and put in a replacement pump without VRO.)
Back together, ran a "little better" but now wouldn't go off idle without pushing in the key and engaging the primer.
So, took it to the local marine shop that has a good reputation, they removed the carbs and rebuilt them. Found a lot of "gunk", said it should run correctly.
Put it back on the water, now it was able to get to about 1/4 throttle then sputter and stop. Would only go past 1/4 throttle with the prime engaged - and then it ran great (had to hold in the key).
Back to the marina....they disassembled the carbs two more times. Each time I was able to get more power without engaging the prime, but still can only get about 1/2 throttle without engaging the primer.
Once I engage the primer - it runs great. Let off the prime, and it slowly reduces power until it sputters....
The marina is stumped. I'm at a loss.
Could it be an ignition problem that's masked by a rich mixture (engaging the primer)?
We all thought it was a fuel issue...looked into the fuel pump but that appears normal as well. Carbs have been gone over multiple times.
Any help is appreciated. Sadly, I went ahead an winterized the boat. Lost this season to issues.
Like I said - pushing in the key and engaging the primer - runs full RPM no issues....let off and it slowly powers down eventually sputters....can get about half throttle without engaging the primer.
Thanks!
Curt
New poster here. I bought back our once original 1987 18' Manatee with a 1987 Johnson 90 VRO V4 outboard. We purchased this new in 1987, sold it in 1991. Anyway, I found the entire package and bought it back. Lengthy post!
Finally took the boat out on the river(, and of course, it doesn't run correctly. Wouldn't even idle without engaging the primer solenoid (push in the key).
So, I bought the repair manuals, a carb rebuild kit, and tore the carbs apart.
(Also, the previous owner removed the VRO pump and put in a replacement pump without VRO.)
Back together, ran a "little better" but now wouldn't go off idle without pushing in the key and engaging the primer.
So, took it to the local marine shop that has a good reputation, they removed the carbs and rebuilt them. Found a lot of "gunk", said it should run correctly.
Put it back on the water, now it was able to get to about 1/4 throttle then sputter and stop. Would only go past 1/4 throttle with the prime engaged - and then it ran great (had to hold in the key).
Back to the marina....they disassembled the carbs two more times. Each time I was able to get more power without engaging the prime, but still can only get about 1/2 throttle without engaging the primer.
Once I engage the primer - it runs great. Let off the prime, and it slowly reduces power until it sputters....
The marina is stumped. I'm at a loss.
Could it be an ignition problem that's masked by a rich mixture (engaging the primer)?
We all thought it was a fuel issue...looked into the fuel pump but that appears normal as well. Carbs have been gone over multiple times.
Any help is appreciated. Sadly, I went ahead an winterized the boat. Lost this season to issues.
Like I said - pushing in the key and engaging the primer - runs full RPM no issues....let off and it slowly powers down eventually sputters....can get about half throttle without engaging the primer.
Thanks!
Curt
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