« previous next »
Pages: [1]   Go Down

Author Topic: backfire from carbs and out exaust.  (Read 930 times)

0 Members and 1 Guest are viewing this topic.

Offline Queeg

  • insane fuel junkie
  • Enthusiast
  • **
  • Posts: 232
  • OY! with the poodles allready!
    • Queegs Problems
backfire from carbs and out exaust.
« on: September 25, 2010, 05:33:57 PM »
OK so now I'm trying to start my girlfriends bike.  i took the motor out  to part it and the frame.  also a carb rebuild.  put it back together. didn't touch the timing as it was perfect.
 all i have gotten so far is a few puffsout the carbs. and a few loud pops out the muffler.
i did a bench sync, which was part of the cleaning and examining of the carbs. than a quick paint job on the bodies.
 
  could have the timing adjusted itself. the cover was on the motor thewhole time except when i put the custom points cover on.  it has plenty of clearance.
 
 fuel is brand new got it weds night. carbs do have fuel. and i have spark. battery is holding 11.4 volts when i checked it this morning. which still lets my LED tail light work.

 driving me nuts.
 just need a clear head or 100 to give me i deas and some moral support

 ohh yeah its a 76 550 super sport.  stock 4-1 exaust and  pods. with a diffrent muffler.
« Last Edit: September 25, 2010, 05:46:33 PM by Queeg »
Logged
guess who?

Offline Gordon

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 12,114
  • 750K1, 550K2
Re: backfire from carbs and out exaust.
« Reply #1 on: September 25, 2010, 05:52:29 PM »
Sounds like you may have either the coils or spark plugs wired up backwards.
Logged

Offline Queeg

  • insane fuel junkie
  • Enthusiast
  • **
  • Posts: 232
  • OY! with the poodles allready!
    • Queegs Problems
Re: backfire from carbs and out exaust.
« Reply #2 on: September 25, 2010, 05:57:27 PM »
hmmmmmm
  i bet.. OK i had a bad set of coils too when i put it back together or someone barrowed my good set..
  so if you know off the top of your head. the yellow lead to the coil goes to the left or right coil.
i know a fresh head would help. i bet its exactly whats going on.


 i just checked and it looks like your correct. gonna give her a try right now
« Last Edit: September 25, 2010, 06:00:06 PM by Queeg »
Logged
guess who?

Offline TwoTired

  • Really Old Timer ...
  • *******
  • Posts: 21,802
Re: backfire from carbs and out exaust.
« Reply #3 on: September 25, 2010, 06:06:05 PM »
A fully charged battery is 12.6V
A depleted battery is 12.2 v no load.

LEDs take about .1 amps.  Coils take about 3 amps.

Charge your battery


The odd misfires do sound like timing issues/miswire.
Logged
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Queeg

  • insane fuel junkie
  • Enthusiast
  • **
  • Posts: 232
  • OY! with the poodles allready!
    • Queegs Problems
Re: backfire from carbs and out exaust.
« Reply #4 on: September 25, 2010, 06:16:10 PM »
Quote from: TwoTired on September 25, 2010, 06:06:05 PM
A fully charged battery is 12.6V
A depleted battery is 12.2 v no load.

LEDs take about .1 amps.  Coils take about 3 amps.

Charge your battery


The odd misfires do sound like timing issues/miswire.

no missfire, just backfire.
 had gotten it started sicne paint..........
 
 and now... Gordon i owe you a beer or 2.
 switched the coil wires (blue and yellow) put the tank on. put fuel back in it!
 FIRST KICK IT STARTED.  YAY.
 FIRED ON ALL 4!
 now time to do a proper sync with gauges and  take her for a spin.

 THANKS A MILLION!
Logged
guess who?

Offline Gordon

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 12,114
  • 750K1, 550K2
Re: backfire from carbs and out exaust.
« Reply #5 on: September 25, 2010, 07:14:07 PM »
I learned the hard way (multiple times, unfortunately ;)) that it's usually the obvious things that trip you up the most.
Logged
Pages: [1]   Go Up
« previous next »