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550 vs 750

  • Thread starter Thread starter 78550GS
  • Start date Start date
7

78550GS

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Is it possible to use the ignition from an 81 GS750E on a 78 550E?

Ignitor, coils, signal generator. Do I need the stator from the 750? Or any other parts?
 
78550GS said:
Is it possible to use the ignition from an 81 GS750E on a 78 550E?

Ignitor, coils, signal generator. Do I need the stator from the 750? Or any other parts?
Click to expand...

Stator? Humm... You realize, of course, that the stator is part of the charging system right?
 
I'm going to go with "doubtful." The '81 750E has an electronic ignition while the '78 550E almost certainly didn't. Physically, the engines are quire different.
 
78550GS said:
Is it possible to use the ignition from an 81 GS750E on a 78 550E?

Ignitor, coils, signal generator. Do I need the stator from the 750? Or any other parts?
Click to expand...

you can wire the coils/ignitor/signal gen up on the bench and spin the rotor between the pick ups and make the plugs fire without it even being mounted.
i have did a few of these conversions but your 8 valve engine will want more timing than the 16 valve.
i don't remember if just changing the advancer took care of this or if i had to slot the signal gen plates slots.
 
eil said:
I'm going to go with "doubtful." The '81 750E has an electronic ignition while the '78 550E almost certainly didn't. Physically, the engines are quire different.
Click to expand...
Yes, they are very different, but while I was filing the 550 points, I checked the signal gen from the 750 and it is the same size.

blowerbike said:
you can wire the coils/ignitor/signal gen up on the bench and spin the rotor between the pick ups and make the plugs fire without it even being mounted.
i have did a few of these conversions but your 8 valve engine will want more timing than the 16 valve.
i don't remember if just changing the advancer took care of this or if i had to slot the signal gen plates slots.
Click to expand...

Is there a certain advancer that would do this? I'm tired of playing with the points for now.

Nessism said:
Stator? Humm... You realize, of course, that the stator is part of the charging system right?
Click to expand...

Yes......D'oh.... please disregard that question. :-\\\
 
yes the points advancer in your bike.
you will have to grind the end off(750 rotor) a certain amount so that when installed it will advance and not bind.
remember you have to install the 750 rotor on your 550 advancer..there is a length difference.
 
Got it all worked out. Had to grind the end of the rotor bolt where the edge is raised a bit to clear the cover. I just got the carbs back together thanks to Z1, and did a test run around the block. Synced the carbs late and had a (few) beer(s), so the full test run with a few plug chops to check my jetting will be done after work today.
 
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