mtkrusmark
Recruit
- Joined
- May 21, 2019
- Messages
- 3
so I have read this forum alot in the last 2 years as I have a 1988 baylinder trophy 17ft with a 1988 force 85hp motor. serial number for the motor is 856x8a.
when I bought the boat it had alot of issues but I got it to run up to 4k rpm at WOT after carb rebuilds, carbon fiber Reed valves, new fuel pump rebuild kit, and also a new trigger. the motor has never ran in the running range of rpm since I've owned it.
last year I had some issues with it so I decided to buy a clymer service manual and adjust the motor per the manual. (I also bought a 2 cycle timing light, a dva setup for my multimeter, and a spark tool to ground out the wires when testing or timing.) since I adjusted the motor to the manual the motor only runs to 3k rpm and misfires at any load more than idle. it fires up with just a flick of the key and doesnt overly smoke.
I run 91 octane non ethanol with valvoline 2 cycle marine mix oil.
I have tested the stator and also ohmed it, I was getting 259 volts on the high side and 197 volts on the low side, i had 630 ohms on the low side and 430 ohms on the high side. I also ohmed the spark plug wires and had 938 ohms average with every one over 900. when I hook up the grounding tool to the motor to time it it has bright blue spark on all 3 cylinders when cranking. when running at idle it doesnt miss at all.
i was asked my a marine mechanic if I'm getting any smoke out of the cowling when it misfires at WOT and I said no but I have checked the intake port covers and the gaskets were good. I also checked and cleaned the entire exhaust side of the motor by going through the exhaust port plate side.
compression on cylinders are 115, 113, 115 those were cold pressures.
out of the water it will rev out to 6k easy ( I know not to do that with just a hose hooked up but wanted to make sure it was load based misfire)
the primer gets rock hard when priming and I dont have any kinks or air in the fuel lines.
I'm running a 13x15 3 blade aluminum prop which I found to be the stock style prop, but I do have an aftermarket 19 pitch 4 blade prop that I have switched on it back and forth and in both cases the motor will go to the exact same rpm with either prop on it. I get more speed and it will kinda plane out with the 19 pitch on it. both props only let the motor go to 3k rpm and last year both props the motor would only go to 4k rpm.
the boat is not loaded any heavier this year than it was last year and I actually moved the batteries up front to help the weight transfer on the boat to help plane faster.
I'm at a loss of where I go next in the issue I'm having. if u have read this entire post and can think of anything let me know please. and thank you all for having alot of knowledge that I have read and has helped me up to this point
when I bought the boat it had alot of issues but I got it to run up to 4k rpm at WOT after carb rebuilds, carbon fiber Reed valves, new fuel pump rebuild kit, and also a new trigger. the motor has never ran in the running range of rpm since I've owned it.
last year I had some issues with it so I decided to buy a clymer service manual and adjust the motor per the manual. (I also bought a 2 cycle timing light, a dva setup for my multimeter, and a spark tool to ground out the wires when testing or timing.) since I adjusted the motor to the manual the motor only runs to 3k rpm and misfires at any load more than idle. it fires up with just a flick of the key and doesnt overly smoke.
I run 91 octane non ethanol with valvoline 2 cycle marine mix oil.
I have tested the stator and also ohmed it, I was getting 259 volts on the high side and 197 volts on the low side, i had 630 ohms on the low side and 430 ohms on the high side. I also ohmed the spark plug wires and had 938 ohms average with every one over 900. when I hook up the grounding tool to the motor to time it it has bright blue spark on all 3 cylinders when cranking. when running at idle it doesnt miss at all.
i was asked my a marine mechanic if I'm getting any smoke out of the cowling when it misfires at WOT and I said no but I have checked the intake port covers and the gaskets were good. I also checked and cleaned the entire exhaust side of the motor by going through the exhaust port plate side.
compression on cylinders are 115, 113, 115 those were cold pressures.
out of the water it will rev out to 6k easy ( I know not to do that with just a hose hooked up but wanted to make sure it was load based misfire)
the primer gets rock hard when priming and I dont have any kinks or air in the fuel lines.
I'm running a 13x15 3 blade aluminum prop which I found to be the stock style prop, but I do have an aftermarket 19 pitch 4 blade prop that I have switched on it back and forth and in both cases the motor will go to the exact same rpm with either prop on it. I get more speed and it will kinda plane out with the 19 pitch on it. both props only let the motor go to 3k rpm and last year both props the motor would only go to 4k rpm.
the boat is not loaded any heavier this year than it was last year and I actually moved the batteries up front to help the weight transfer on the boat to help plane faster.
I'm at a loss of where I go next in the issue I'm having. if u have read this entire post and can think of anything let me know please. and thank you all for having alot of knowledge that I have read and has helped me up to this point