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fouling plugs

  • Thread starter Thread starter orgis
  • Start date Start date
O

orgis

Guest
number two and four plugs constantly fouling and misfiring now and a gain

any ideas?

edit i just changed the coils and it hasn't made that much differenece
1978 Suzuki GS750 4\1 harris race
 
Are they fouling with oil or gas Gas; black dry look. Oil; black wet look.
 
Have you seen this page?:
http://www.factorypro.com/tech_tuning_procedures/tuning_carbtune,CV,high_rpm_engines.html

It's an excellent resource. Note the section on float height and fouling plugs.

Also be sure your idle mixture screws are set right. A little too rich at idle and they'll foul.

If you've changed the coils with no result, make sure you also test the voltage at the coils. If you're not getting 12v or darn close, you'll foul plugs.

But of course if they're fouling with oil you're in for a bit more work...
 
they are black and dry i will test voltage on coils later and post results,
i have tochange plugs regular but also my carbs need balanced
thanks
 
Did you inherit this problem or did the bike just suddenly start doing this?
A simple thing such as incorrect pilot fuel screw (underneath) adjustments and/or side air screw adjustments could foul plugs as you say.
The pilot fuel screws should be approx' 1 1/4 turns out from LIGHTLY seated on your bike and the side air screws initially set to 1 3/4 turns out and then fine adjusted using the highest rpm method.
Try these basic adjustments and test.
 
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