Hi all,
I have been trouble shooting this motor for some time now with the help of a lot of good people here. We were unable to get RPMs at WOT. This is a new to us motor. I changed out the fuel pump, ignition coils, hoses and cleaned and rebuilt the carbs with new kits. The motor continued to fall flat under load. I did not have a timing light until this morning so I could not do a link and sync. I finally got one and used Joe Reeves method for setting spark advance to WOT.
Heres what I found. The motor was firing at around 20-21 degrees at WOT. The motor is supposed to be firing at 19 degrees which would be 15 degrees using Joe's method. I was able to retard the spark advance to 15 degrees with plenty of thread left on either side.
My questions are:
1. How could the timing be that far out.
2. Would the motor still run at 25 degrees rather than 19. I am asking because I have read other posts that people have found that the flywheel has been installed improperly so that the timing grid is not in the proper place. I really hope that wasn't the case here.
3. I used and inductive timing light with no advance controls. Does this matter. I am not sure what the advance controls do. If I read 15 degrees on the plain Jane timing light, is that truly 15 degrees?
4. I was unable to find the timing spec for the motor at idle in my manual. There is a stop on the other side of travel that I could adjust. The motor seems to idle fine, but I thought I would check it anyway.
Taking her out tonight, to try again. Fingers crossed. If this is not the solution, I think I am going to have to take her in because I'm out of ideas.
Thanks for your help,
Jeff
I have been trouble shooting this motor for some time now with the help of a lot of good people here. We were unable to get RPMs at WOT. This is a new to us motor. I changed out the fuel pump, ignition coils, hoses and cleaned and rebuilt the carbs with new kits. The motor continued to fall flat under load. I did not have a timing light until this morning so I could not do a link and sync. I finally got one and used Joe Reeves method for setting spark advance to WOT.
Heres what I found. The motor was firing at around 20-21 degrees at WOT. The motor is supposed to be firing at 19 degrees which would be 15 degrees using Joe's method. I was able to retard the spark advance to 15 degrees with plenty of thread left on either side.
My questions are:
1. How could the timing be that far out.
2. Would the motor still run at 25 degrees rather than 19. I am asking because I have read other posts that people have found that the flywheel has been installed improperly so that the timing grid is not in the proper place. I really hope that wasn't the case here.
3. I used and inductive timing light with no advance controls. Does this matter. I am not sure what the advance controls do. If I read 15 degrees on the plain Jane timing light, is that truly 15 degrees?
4. I was unable to find the timing spec for the motor at idle in my manual. There is a stop on the other side of travel that I could adjust. The motor seems to idle fine, but I thought I would check it anyway.
Taking her out tonight, to try again. Fingers crossed. If this is not the solution, I think I am going to have to take her in because I'm out of ideas.
Thanks for your help,
Jeff
