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starting and timming?

  • Thread starter Thread starter boba
  • Start date Start date
B

boba

Guest
ok, my 78 gs550, i started it again today, heres what is going on. as you know i have had some problems with it, well i reset the cam chain timming, the arrows are pointed in the right direction, the chain is 20 teeth apart, the chain problem is now fixed, the govenr advance is been replaced because it was stuck and craked in a couple places, the points are cleand along with the plugs.

Now, when i go to start it. It turns over wants to try to fire, eventually it will. when i had the top off, and the plugs out, the timming mark was lined up where it was supposed to be on the 1-4 side behind the points. the points were closed just ready to open and spark.

now, the piston isnt at top center. it still on its way up and about 1/4 to 1/2 inch below the top. and when it get to the top it has already fired.
i followed everything that the book said ro do to set my valves with the crankshaft and the timming mark behind my points. if i turn it over by hand or with the kick or button it does everthing the same fires upto 1/2" before top center. is that where it supposed to be????
 
Some bikes have 18 pins between #2 and #3 on the cam sprockets.
Did you count the pins directly over the arrows?
 
pins and arrows

pins and arrows

chef1366 said:
Some bikes have 18 pins between #2 and #3 on the cam sprockets.
Did you count the pins directly over the arrows?
Click to expand...

yes i counted 20 pins starting right above the #2 and that was at top center and the timming mark linef up, but both points would be open
 
it almost acts like a car when you have a distriutor 180 out.

is ther a way to put the govener advace in wrong? i think it would work if the peice with the lobe that opens the points was in a differant place.
 
Not sure about points and I know the advance can only go in one way with the dowel.
The crank can be off 180 though so that the lobe that triggers the points is off.
 
On my bike it fires at about 34 deg BTDC, in other words it fires as the piston is rising as you discribe.
Any chance that the trigger wires going to the coils are reversed, that way it would spark on 1-4 when it should be firing 2-3 and vice versa.
Just a thought, good luck
 
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