Hello All! I have a 1999 Sea Rayer jet boat that'd got some electric gremlins, I'm trying to trouble shoot but getting mixed results. The motor is a Mercury "175xr2" on a jet pump. I guess its basically the same carbureted 6 cyl of the 200 horse power outboard of the same era. Anyway hopefully I can get some help here.
The last time I had it out I was on the way in running about 2000 rpm it bogged down like it sucked it some weeds but then only ran about half power the rest of the way to the dock, when I got to the dock and out of the water it would not restart, just turns over with no spark. I did a compression check, all were 120ish, and can even smell fuel so I'm certain its a spark problem. I went through the manuals spark trouble shooting. Stator and trigger resistance both checked out ok but after that I start getting some weird results from the ignition tests. to start I didn't have a 400VDC setting on my meter so used 600VDC and I could only get the rpms the starter turns it over, I'm sort of thinking that's part of the reason for the low readings??? anyway for the coil primary I get 0 (zero) volts, switch box stop circuit one is 15-20 volts on one and 0-10 volts on the other, stator low speed I get 20-25 volts and the high speed is 0-1 volt. All of these are way lower than what the chart says it should be at 400RPM, not sure of that's because the stator is bad or the RPMs are lower than 400.
Based on what I'm reading it seems like it could be the switch boxes but could they have really gone bad at the same time? What else should I check or try before spending a ton of money on replacing both of them? The stator was replaced less then 20 hours ago (fall 2018), could it really have gone bad again? Could it just have come out of timing? I haven't pulled the flywheel off yet, not sure what I should look for if I do... Will likely pull it this afternoon and see if there's anything obvious since I'm sort of out of ideas now.
Thanks,
Doug
The last time I had it out I was on the way in running about 2000 rpm it bogged down like it sucked it some weeds but then only ran about half power the rest of the way to the dock, when I got to the dock and out of the water it would not restart, just turns over with no spark. I did a compression check, all were 120ish, and can even smell fuel so I'm certain its a spark problem. I went through the manuals spark trouble shooting. Stator and trigger resistance both checked out ok but after that I start getting some weird results from the ignition tests. to start I didn't have a 400VDC setting on my meter so used 600VDC and I could only get the rpms the starter turns it over, I'm sort of thinking that's part of the reason for the low readings??? anyway for the coil primary I get 0 (zero) volts, switch box stop circuit one is 15-20 volts on one and 0-10 volts on the other, stator low speed I get 20-25 volts and the high speed is 0-1 volt. All of these are way lower than what the chart says it should be at 400RPM, not sure of that's because the stator is bad or the RPMs are lower than 400.
Based on what I'm reading it seems like it could be the switch boxes but could they have really gone bad at the same time? What else should I check or try before spending a ton of money on replacing both of them? The stator was replaced less then 20 hours ago (fall 2018), could it really have gone bad again? Could it just have come out of timing? I haven't pulled the flywheel off yet, not sure what I should look for if I do... Will likely pull it this afternoon and see if there's anything obvious since I'm sort of out of ideas now.
Thanks,
Doug