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78 GS1000 Burning Up Plugs

  • Thread starter Thread starter Anonymous
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Anonymous

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I have a question.I have a 78 GS1000 with kerker 4 into 1 headers,dyna ignition,K&N jets and filter.I ride the bike about 2 to 3 days and keep burning plugs.If my baffle is gone from my kerker would this cause early breakdown of the plugs?It runs good then the plugs look wet and dont spark no more.Thanks....




Live life on 2 wheels or don't live at all......
 
Are they wet with gas or Oil ? It may be running too rich and fouling the plugs
 
when they die they are wet....they throw very little spark....
 
You have to go back and check things. Check the air filters, if they have too much oil on them it will make it run rich, Check the ign timing, Check the carbs and see what jets are in the carb Stock jet is #95 so you should have #110-115s thats just a guess. Also I would consider replacing the coils if they are original 78 model would have 5 ohm coils stock Dyna works best with 3 ohm coils Haven't tried it but coils from late model GSXR 600 are said to work
 
When you say the plugs are wet, please identify if they are wet with gasoline or oil.

It's pretty easy to tell...just remove a plug and run your finger across it.

Even easier....take it out and let it sit for a minute or two. Gasoline will evaporate...oil won't.

Don't judge the quality of the spark when using a wet plug. Some (or all) of the electricity will track the fluid, instead of arcing the gap. This can give the appearance of a weak spark, when it is actually very good.
 
They are wet with fuel.If i put a new set in and take it on the highway they burn longer.If i just cruise it in the city is when they look black and die...
 
I've been having the same exact issue for a long time, primarily with #1. I didn't care too much, but now it's gotten so frequent that it starts loading up after just a few miles in the city and I have to take it out and slap the snot out of it until it clears it's. About every third day, it just not firing and I change that plug. Off to the carb doctor on Monday morning.
 
78 gs 1000 burning up plugs

78 gs 1000 burning up plugs

If it is only one cylinder you could be looking at a compression problem in that cylinder that is what it sounds like if in fact it is only one cylinder, I have already been there the problem cylinder was running at 90 and the others were all at 120 had to rebuild the upper end. something to think about
 
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