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Hotter than NGK D8EA?

  • Thread starter Thread starter Raulmanny50
  • Start date Start date
R

Raulmanny50

Guest
I know that this is a very sensitive subject for many and I apologize in advance:
But, can I find an spark plug a little hotter that NGK D8EA?
I'm getting a certain amount of fouling and I'll like to try something hotter before I go for an overhaul (have 31K miles). Apparently I'm getting oil on the chamber, not too much and I'm not a mosquito fumigator. But I'm changing the sparks (cleaned by sand blasting) quite often.
Again, I do not want to hurt someone feelings.
Thanks in Advance.
Any other recommendations are WELCOME
 
Are you sure it's oil fouling and not gas? Are you addiing oil regularly?
Make sure you are not overfilling crankcase-check level when cold on centerstand.
 
tom203 said:
Are you sure it's oil fouling and not gas? Are you addiing oil regularly?
Make sure you are not overfilling crankcase-check level when cold on centerstand.
Click to expand...
Good point I should have added that .
 
When I got the bike (Suzuki GS650G, 1981, now 31k miles) the stock air cleaner system was not there instead it has now the K&N High Flow filters. That will contribute for a leaner mix, but I'm not 100% sure of the condition of the carburetors, maybe they are set too rich.
Thanks for your help.
 
Try a NGK iridium plug with the proper heat range.
I would not run a hotter plug.
EDIT
This advice is given with your info that you are burning oil.
 
Last edited:
Raulmanny50 said:
When I got the bike (Suzuki GS650G, 1981, now 31k miles) the stock air cleaner system was not there instead it has now the K&N High Flow filters. That will contribute for a leaner mix, but I'm not 100% sure of the condition of the carburetors, maybe they are set too rich.
Thanks for your help.
Click to expand...

I would start with the carbs, rather than the plugs

http://www.mtsac.edu/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf

Take them apart and clean them, replace the O rings, check to see what jets/needles are in there

How's the oil consumption?

BTW, 31k is nothing as far as mileage goes
 
Raulmanny50 said:
When I got the bike (Suzuki GS650G, 1981, now 31k miles) the stock air cleaner system was not there instead it has now the K&N High Flow filters. That will contribute for a leaner mix, but I'm not 100% sure of the condition of the carburetors, maybe they are set too rich.
Thanks for your help.
Click to expand...
Could be that carbs were not rejetted for the individual (?) filters- you have to pull them off and find out. At the very least drop a fuel bowl and pull off main jet for clues. You MIGHT be able to get at #1 or #4 carbs main jet without pulling them entirely off, but I doubt it.
Are the EPA blocking plugs missing over idle/air mixture screws?

Edit;Can you take a pic of carb setup?
 
Last edited:
tom203 said:
Could be that carbs were not rejetted for the individual (?) filters- you have to pull them off and find out. At the very least drop a fuel bowl and pull off main jet for clues. You MIGHT be able to get at #1 or #4 carbs main jet without pulling them entirely off, but I doubt it.
Are the EPA blocking plugs missing over idle/air mixture screws?

Edit;Can you take a pic of carb setup?
Click to expand...
With no air box and pods the carbs will come off easily enough. Give them a good cleaning . and check the jetting. With pods you will probably need a jet kit , because you are going to need the needles to get it right. Maybe the PO already did this.:)
 
just a couple thing I thought of

sand blasting will not always make a problem plug fire under pressure.

changing 4 new spark plugs are easier than doing any carb service.

next check the physical connection of resistor caps to the wires for corrosin. broken insulation on wires or cracked caps can crossfire / or sidefire to the engine instead of sending the jolt thru the resistor and sparkplug. Also if the resistance is much over 8K ohms thru the hard plastic cap that might be your issue.

the path of least restiance theory and all.

I like b7's when it is under 60 degrees F and 6's when it is under 40. your bike will warm up to proper temps and keep temerature when riding in the cold -aircooled not air frozen - gotta be hot for the metals to be at operating tolerances- this tuning detail is for after you get the jetting set.. The different heat range plugs will make the warm up different and change overall running temperature- so remember temprature of the weather is the factor for sparkplug heat range of a GS.... cold plugs sputter a little bit longer til properly hot. 8 's are too cold for winter time
 
I had a problem w the "no-firing" of cylinder #1 then I took it to a DIFFERENT motorcycle shop where an old guy realized that the floater for the carb was stuck.
Besides I thought had problems w/ the battery, actually was a burned wire (W/G) related to the AC Generator. The Bike Is running great and the maintenance-free battery from Feb. 08 is holding well. Yuppy! Tomorrow, to my job on the bike!
 
NGK DR8EIX is the Iridium IX plug type. You can get the plugs at any auto supply store.
 
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