I have a 1984 Johnson VRO (with VRO disconected, thanks to previous owner). After about 30 minutes of WOT, 2 cyl conk out, bringing RPMs down to about 2500 - 2800. Runs this way for 30 - 45 minutes, then all four cyls kick in back up to 4500 rpms. then will cycle from 2 to 4 cyl off and on. recent work - Have replaced both power paks; tilt & trim relays; impeller; new tach; horn; cup & plate; new battery; new fuel filter.
Problem started on 9-8-07; ran about 45 min, then would not run over 2800 rpm WOT; ran back to dock on 2 cyl;
compression good; no fire in right bank; replaced both power paks (to be on safe side); fuel filter; all cyl firing, ran in tank for almost 2 hours, no problem.
Took it out 9-22-07; ran about 30 - 40 min, then would not run over 2500 -2800 rpm; ran back to dock on 2 cyl; when cut motor off, tilt relay was stuck going down;
replaced both relay on tilt & trim; tighten all connections.
Took it Wed, 9-26-07 for trial run after repairs; ran like a scalded dog for over an hour, no problems.
took it out Sat, 9-29-07, ran fine to islands about 30 minute run; wade fished for 2 -3 hours; ran around island for 30 minutes; wade fished for another hour; started home, after about 15 minutes, 2 cyl went out; engine vibrates like hell; ran @ 2600 rpms for about 45 minutes; then, just as we got to the harbour; all 4 cyl kick in, 4500 rpms; ran fine to harbour, while idled into harbour; could hear the 2 cyl kick in and out.
All four cyl firing fine after pulling boat out of water.
Both times the engine has cut back, been in about 3 - 4 foot seas, rough water, couldn't work on engine out in the water; ran fine on 9-26-07 test run; smooth water. Checked all connections; can't find any loose connections that maybe affected by rough seas!!!
I am at my wits end......
Problem started on 9-8-07; ran about 45 min, then would not run over 2800 rpm WOT; ran back to dock on 2 cyl;
compression good; no fire in right bank; replaced both power paks (to be on safe side); fuel filter; all cyl firing, ran in tank for almost 2 hours, no problem.
Took it out 9-22-07; ran about 30 - 40 min, then would not run over 2500 -2800 rpm; ran back to dock on 2 cyl; when cut motor off, tilt relay was stuck going down;
replaced both relay on tilt & trim; tighten all connections.
Took it Wed, 9-26-07 for trial run after repairs; ran like a scalded dog for over an hour, no problems.
took it out Sat, 9-29-07, ran fine to islands about 30 minute run; wade fished for 2 -3 hours; ran around island for 30 minutes; wade fished for another hour; started home, after about 15 minutes, 2 cyl went out; engine vibrates like hell; ran @ 2600 rpms for about 45 minutes; then, just as we got to the harbour; all 4 cyl kick in, 4500 rpms; ran fine to harbour, while idled into harbour; could hear the 2 cyl kick in and out.
All four cyl firing fine after pulling boat out of water.
Both times the engine has cut back, been in about 3 - 4 foot seas, rough water, couldn't work on engine out in the water; ran fine on 9-26-07 test run; smooth water. Checked all connections; can't find any loose connections that maybe affected by rough seas!!!
I am at my wits end......
