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GS1150 Oiled spark plugs

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Guest
I have always though the engine was oiling up plugs if it idled for too long.
Mate looked at the plugs and said fuel.

Standard 1150 with pods and 4 in to 1

compression cold

175 - 180 - 160 - 165

main jets are 155
pilot 47.5

does this sound right?

What is the recommended for this setup?
thanks

 
here are the factory spec for the 1150 carbs

84 GS1150

Type----------------- Mikuni BS36SS
I.D. NO. -------------00A10
Bore -----------------36mm
Idle r/min----------- 1100+or- 100r/min
Fuel level------------ 3.0 +- 0.5 mm
Float height---------- 21.4 +- 1.0 mm
Main jet ------------- #120(nos.1&4),#122.5(nos 2&3)
jet needle------------ 5D14
Needle jet ----------- X-3
Pilot jet ---------------#45
By pass--------------- 0.9,0.8,0.9 mm
pilot outlet------------ 0.9 mm
Valve seat------------ 2.0 mm
Starter jet------------ #32.5
Pilot screw------------ PRE-SET (2 turns back)
Throttle valve--------- #130
pilot air jet------------- #125
Throttle cable play-----2-3 mm
choke cable play-------0.5-1.0 mm



those plugs look like your running very rich on the fuel mixtures and this is the good news because you can easily fix it by rejetting the bike
if it was oil then you would be spending a lot more money to cure the problem

The general "rule of thumb" for jetting increases will suggest you to go up 3 to 5 sizes for an exhaust system and 4 to 6 sizes for pods. Seeing as you have both, something in the range from 7 to 11 sizes larger than stock.
so in your case you would want 142.5 for #1&4 and 145 for #2&3 and more than likely stock pilot jets
those jet sizes are going up by 9 sizes so it should put you in the area where you can then start fine tuning it
hope that helps

 
Last edited:
Wow, those are some sooty plugs for sure. Way rich, not oil fouled.
 
Thanks guys for the replys.

So based on the info..

1&4 - 147 main
2&3 - 149.5 main

sound good?
 
Changing the heat range of the plugs is just a "Band-Aid". Fix the real problem, instead.

What brand of pods do you have? Yes, it makes a difference in jetting.

What 4-into-1 do you have? What baffle is in it? Yes, it makes a difference in jetting.

Where are you coming up with strange jet sizes like 147 and 149.5?

Using that "rule of thumb" that was presented earlier, you might need something in the 135-145 range, if using Mikuni jets.
If you are using Dynojet parts, they would be 144-154, and there is usually no need to increase the pilots, so 45s should work just fine there.

.
 
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