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83 GS750E rebuild thread.

  • Thread starter Thread starter piester
  • Start date Start date
well i was going to get a new set of coils anyways so ill just snag those and new caps and see what that brings me
 
If you have two sets of coils and one is known good why would you buy more?
Check the coils like this.
Connect the orange/white wire to the positive terminal on the battery.
The white or black wire connect to the negative terminal. Put a plug in one of the wires and ground it to metal.
Let the coil charge and then disconnect the negative wire and the plug should fire.
 
the one set isnt known to be good. it came off of a bike that ran poorly, hit a deer, then wouldnt run half the time. then the coils sat off the bike on my shed floor covered in snow and frozen to the ground. right next to the ones from my 750e. i didnt realize that my shed had a leak in it so all 4 of my coils sat in a puddle then froze to the ground. so im kinda weary of all of them. i tested them as you said. would get a spark every now and then depending on how i held the coil and plug. plug was grounded solidly. im going to go to basecliffs website and go through the ignition test stuff before i buy anything
 
ok well after taking the resistors out of the plug caps and replacing them with a bit of brass all 4 plugs fire when grounded to the block. 1 and 4 have a much brighter spark than 2 and 3 thow. plugs 1 and 4 are much newer thow. so my next step is to replace the plugs, caps, and wires as all of them are old and work hardened very badly. when i fired it up it was about 5 degrees out. it seemed to run on all 4. idled nicely with the choke closed after it warmed for a bit. but then after a bit 2 and 3 didnt seem to be firing anymore. any advice on what plugs, wires, and caps to get? and before anyone asks, the plug wires on these coils are very easily replaced. i think i need solid copper core wires (i found 7mm, 19 strand copper core), D8ea plugs, and 2 each of plug caps vd05f and xd05f. sound about right?
 
Pm replied. Small update. Checked the plugs. Had 2 new plugs and 2 old plugs. Replaced plugs with the 4 newest plugs i had and am now getting a nice spark across all 4. Im hoping that it will be a bit warmer out tomorrow so i can drag her out of the shed and get some pictures and tinker a bit. Now since i am getting a nice blue spark across all 4 what other reasons would there be for 2 and 3 not firing all the time? Timing being off? Im pretty sure im getting fuel to all 4. The carbs were cleaned and rebuilt by chef. Ideas?
 
piester said:
Pm replied. Small update. Checked the plugs. Had 2 new plugs and 2 old plugs. Replaced plugs with the 4 newest plugs i had and am now getting a nice spark across all 4. Im hoping that it will be a bit warmer out tomorrow so i can drag her out of the shed and get some pictures and tinker a bit. Now since i am getting a nice blue spark across all 4 what other reasons would there be for 2 and 3 not firing all the time? Timing being off? Im pretty sure im getting fuel to all 4. The carbs were cleaned and rebuilt by chef. Ideas?
Click to expand...
Igniter??
...
 
Never mind found out how. Would i be getting a bright blue spark across all 4 if this was bad thow?
 
Always start with the routine maintenace items, you would be surprised the difference they make. You can set the valve clearances in about an hour or two depending on your wrenching abilities, check the compression later. Plugs go bad that is why they get replaced.
 
Yeah. I plan on checking the valve clearences as soon as i get another chance to work on her. I dont have any extra shims thow. Will the shims out of my 850 fit? Im thinking no. And does the 83 750E have 8 valves or 16?
 
swap the coil and wires from 1-4 to 2-3 see if the problem follows them.
 
piester said:
Yeah. I plan on checking the valve clearences as soon as i get another chance to work on her. I dont have any extra shims thow. Will the shims out of my 850 fit? Im thinking no. And does the 83 750E have 8 valves or 16?
Click to expand...

The black motor has tappets not shims. All you need is a feeler guage, a 10mm and 6mm wrench.
 
I'm a little late on reply but make sure to check the plug wires... (Going to the right cylinder) I removed my coils and put new plug wires on them then hooked them back up (sware i put them back the same) and was doing the same thing... getting good spark on all four BUT and thats a BIG BUTT they and the power wires also have to be hooked up to the correct -/+ // cyl... Good luck.
 
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