Hello,
New to this form but see there are loads of knowledgeable folks on here so hoping someone can help.
I have recently almost completed a project where I'm trying to make a good outboard out of 2 almost 100% identical ones. I have a 1974 135 and 1975 135 - as far as I can see the only difference is the carburettors and ignition coil being 12amp on the 1975 (I checked most of the part numbers and seem to be the same)
Anyway, I seem to have a couple of issues that I can see:
1. It will not fire up for the life of me, I have 140psi on all four, spark on all four with plugs out and I set the timing at WOT to 18 degrees (using Joe Reeves method) and I have fuel as I checked the carbs and can see the plugs get wet. I have also tried all the best practise starting methods with choke on full using the mechanical lever but not one fire.
To troubleshoot the above I checked the spark with plugs in but it seemed very week at best and never sparked on all four so I swapped out the Powerpack, timing base and 12amp stator with older 6amp and the same result, spark is week and often you cant see it at all, if I take the plugs out I get a good spark on all four. Logic would tell me that this means the stator is not got enough voltage but I have tried 2?? I tested the one I removed (12 amp) and it was 800 ohms, but the 6amp was the correct 600 ohms.
My question here is - what other component might cause this problem where it would seem there is not enough power coming from the stator with plugs in. I also tested the voltage coming from the stator (ignition side) and got 74v with a normal volt meter, I have not tested the peak voltage yet. To also note I have purchased a brand new battery with 800 cold starting amps and starter motor looks to be in a good nick, engine turns over reasonably fast but have no RPM meter to check what speed but from looking on the internet its not turning over slow.
2. Unsure if this is related (suspect I might have 2 issues). If I put the timing at idle position and turn it over I get no spark, If move the lever off idle by raising the start lever I suddenly get a good spark. Its as if the timing is moving out of range, I also tested this by leaving the remote with start leaver up and disconnecting the linkage to the timing but again, as soon as the timing is moved back to idle I get no spark, plugs in or plugs out.
My question here is - can the timing move out of range so it just stops sparking, if not what would cause this to happen?
As far as I could see the timing base has no adjustments, it just sits in place and is clamped down, maybe im wrong?
Hopefully someone can help.
Thanks
New to this form but see there are loads of knowledgeable folks on here so hoping someone can help.
I have recently almost completed a project where I'm trying to make a good outboard out of 2 almost 100% identical ones. I have a 1974 135 and 1975 135 - as far as I can see the only difference is the carburettors and ignition coil being 12amp on the 1975 (I checked most of the part numbers and seem to be the same)
Anyway, I seem to have a couple of issues that I can see:
1. It will not fire up for the life of me, I have 140psi on all four, spark on all four with plugs out and I set the timing at WOT to 18 degrees (using Joe Reeves method) and I have fuel as I checked the carbs and can see the plugs get wet. I have also tried all the best practise starting methods with choke on full using the mechanical lever but not one fire.
To troubleshoot the above I checked the spark with plugs in but it seemed very week at best and never sparked on all four so I swapped out the Powerpack, timing base and 12amp stator with older 6amp and the same result, spark is week and often you cant see it at all, if I take the plugs out I get a good spark on all four. Logic would tell me that this means the stator is not got enough voltage but I have tried 2?? I tested the one I removed (12 amp) and it was 800 ohms, but the 6amp was the correct 600 ohms.
My question here is - what other component might cause this problem where it would seem there is not enough power coming from the stator with plugs in. I also tested the voltage coming from the stator (ignition side) and got 74v with a normal volt meter, I have not tested the peak voltage yet. To also note I have purchased a brand new battery with 800 cold starting amps and starter motor looks to be in a good nick, engine turns over reasonably fast but have no RPM meter to check what speed but from looking on the internet its not turning over slow.
2. Unsure if this is related (suspect I might have 2 issues). If I put the timing at idle position and turn it over I get no spark, If move the lever off idle by raising the start lever I suddenly get a good spark. Its as if the timing is moving out of range, I also tested this by leaving the remote with start leaver up and disconnecting the linkage to the timing but again, as soon as the timing is moved back to idle I get no spark, plugs in or plugs out.
My question here is - can the timing move out of range so it just stops sparking, if not what would cause this to happen?
As far as I could see the timing base has no adjustments, it just sits in place and is clamped down, maybe im wrong?
Hopefully someone can help.
Thanks