Make sure you work with a fully charged & test good battery, if the flywheel does not spin fast enough; it does not produce enough electricity to spark the plugs.
Of course the starter has to be in good health also to crank fast enough.
(did has thrown me off a few times)
Check the trigger-wires & connectors, the wires move around as the trigger advances.
These wires are very thin and tend to break under the shrink-tube.
(maybe at that particular RPM is the spot where it looses ignition??)
In the 2nd. picture; the 3 lines (from left to right) 32 - 30 - 28 degrees
Set the timing at 28 by adjusting the little rod attached to the trigger-assembly (right under the Flywheel) visible in the 1st. picture
In gear full throttle cranking speed by jumping the starter (make sure you have a...
I hear you & will get you through this.
how are you "adjusting" the RPMs ? hopefully at the screw on the bottom of the tower-arm (connected to the trigger-assembly)
also, with the unit OFF and in full throttle forward; are all butterflies evenly horizontal? I mean the throttle butterflies NOT...
"The distance and time in milliseconds the signal takes from trigger to plug remains constant. The piston speed is not."
I THINK.......the timing will be affected because when at 5000 RPMs the Flywheel is also spinning faster like the pistons.
Good thing that you're correcting that now.
this would/could cause the rings/pistons to crack due to shock-waves/blows by the explosion in the cylinder
You don't remove the bottom cowl! just that little plastic air-intake to get access to reach the two nuts for adjusting the upper shift-shaft.
I would disconnect the coupling that connects the upper & lower shift-shaft, then screw in the lower shift-shaft (count the amount of rotation)
then...
The upper shift-rod's nuts are easier accessible when you remove the black plastic shroud that is screwed onto the bottom cowl.
Once that it removed you can tighten the bottom nut to raise the shift-rod.
This normally does not need to be adjusted (ever?) unless it has been messed with.
Are you...
This write-up was from the late Frank A.
one of the many good advices I have received over the years from the experts on this site.( I'm just passing on the knowledge)
So.....to verify;
- Check your compression
-Re-built the fuel-pump
- Set the timing at 28 degrees full throttle at cranking...
As Racerone already mentioned; check the compression on all cylinders
also I'm not entirely sure what you have done so far, but I would;
1.Disconnect the ball link to the carb cam at the timing tower. Disconnecting at the cam risks bending the cam. Move the cam away from the carb roller.
2...
