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1100e running lean

trevor

trevor

Forum Guru
Past Site Supporter
1983 gs1100ed...V&H pipe, stock airbox with K&N filter, have had lid on and off. Dyno stage one. 122.5 mains, 47.5 pilot,clip forth from the top (dyno recomends 3rd from top). Mixture screws turned 3.5 out.
The bike pulls hard through all gears to redline. Runs fantastic! The bike idles great. The plugs are reading on the lean side (white). And the bike is "popping" a lot on decel at higher rpm's.
Help please...:pray:
I have read all kinds of posts on this subject and everything I read says this should be a on the "rich side" set up but everything indicates it's running lean.
Thanks
 
I am confused. The DJ kit comes with 110, 114, 132, 138 mains. How are you running a 122.5?
 
the stage one jets on the DJ kit are from left field :(.

http://www.dynojet.com/pdf/3133.pdf


a DJ 122.5 is like a Mikuni 112.5.

The ES/ESD came stock with a Mikuni 112.5

You need a bigger main jet.

Given the 4:1 pipe and the open k&N filter in the box you should be working down from the lowest stage 3 (DJ 132=Mikuni 122).

Two steps up from the 112.5 is 117.5


A Mikuni 120 will be a little fat but a safe place to start. Probably can adjust between a 117.5 and a 120 with combinations including the lid on and off leave the airbox
 
posplayr said:
the stage one jets on the DJ kit are from left field :(.
a DJ 122.5 is like a Mikuni 112.5.

The ES/ESD came stock with a Mikuni 112.5

You need a bigger main jet.

Given the 4:1 pipe and the open k&N filter in the box you should be working down from the lowest stage 3 (DJ 132=Mikuni 122).

Two steps up from the 112.5 is 117.5


A Mikuni 120 will be a little fat but a safe place to start. Probably can adjust between a 117.5 and a 120 with combinations including the lid on and off leave the airbox
Click to expand...

Well I have the 132's you think that will be the fix eh? The kit says 132's are for pipe and pods set up.:confused:
 
trevor said:
They came out of my 1150. Had tried the 114's and bike was lean so threw in the 122.5's I had.
Click to expand...

Oh, then you should be rich :confused:

Remember you need to subtract 10 to convert from DJ to Mikuni.

DJ 122=MK 112

Stock 1150 jets are Mk 122 which is like a DJ 132
 
Popping on deceleration is indicative of an air leak on the exhaust side in my experience. I would be checking for holes in the pipes or at the joints between the pipes and the mufflers. It can also result on bikes with straight pipes and no mufflers or bikes with mufflers that are not restrictive. I experienced this on my XS 650 Tracker when running Harley shorties with minimal baffling. A bit of fiberglass packing fixed it.

Good luck with it.
Spyug
 
Interesting, I didn't know the DJmains were that much smaller than Mikuni's, very good to know! Subtract 10, that's easy enough. Good point about the header air leak, did he put in double gaskets? lots of times you do to get the pipes to seal properly.
 
azr said:
Interesting, I didn't know the DJmains were that much smaller than Mikuni's, very good to know! Subtract 10, that's easy enough. Good point about the header air leak, did he put in double gaskets? lots of times you do to get the pipes to seal properly.
Click to expand...

Yep, Rob, new gaskets purchased and installed.
 
trevor said:
Well I have the 132's you think that will be the fix eh? The kit says 132's are for pipe and pods set up.:confused:
Click to expand...

No I just explained MK 117.5-120 and you are apparently already over that with the MK 122.5 and and in fact that is the same size as your DJ 132 which you already have installed.

You have another problem. Maybe air leak or need some packing in the pipe.
 
azr said:
Interesting, I didn't know the DJmains were that much smaller than Mikuni's, very good to know! Subtract 10, that's easy enough. Good point about the header air leak, did he put in double gaskets? lots of times you do to get the pipes to seal properly.
Click to expand...

Yes to be more precise you need a calculator to multiply it out x0.925 but most normal jets sizes between MK 130-150 you can just subtract 10.

Looks like closer to 8 steps from MK 110-130

http://www.jetsrus.com/FAQs/FAQ_mikuni_vs_dynojet_vs_keihin_sizes.htm

It is an approximation and it is not much worse than using MK=DJ*.925 which is not that accurate either. All else fails look up the table which itself varys
 
Last edited:
posplayr said:
No I just explained MK 117.5-120 and you are apparently already over that with the MK 122.5 and and in fact that is the same size as your DJ 132 which you already have installed.

You have another problem. Maybe air leak or need some packing in the pipe.
Click to expand...
The pipe is brand new so can't imagine that's the problem.
 
Any cracks in the intake manifolds or the airbox to carbs boots???? Clamps all tightened correctly? Ray.
 
I know you put in new exhaust gaskets but did he install them over top the old ones? (I'm sure I asked you this but I can't remember) On a lot of the 4 into 1 pipes you have to put in two layers of exhaust gaskets to get the pipe to seal properly on the head. I'd really have to listen to your bike again to be 100% sure, but I'm pretty sure it's sealed properly at the head though, I'm sure I would have heard an exhaust leak if it wasn't.
 
Odd, my 750 came with MK 112s stock and when I installed the RC pipe and K&N filter it went lean real quick. Install some MK 117s and all was good, had a nice light to med tan color on the plugs. Now, it's lean again nothing inside was changed. I do know the popping is from the pipe at the mega phone/header connection, mine does it as well. Hmmm, maybe add some more oil to the filter.
 
With the same setup as you on my 80 GS1100E, pipe & all, I run 115 Mikuni mains, adjustable needle in the middle slot, stock pilots 3 turns out, air box lid on. I had the same popping problem until I richened the mixture screws
 
Last edited:
Crage said:
I sure you will update us with results soon Trevor :) .
Click to expand...

Yes I will. Took it island camping with my wife and son. With the elavtion change the temp didn't go up at all. So I'm close. Azr is going to come over this week and we are going one up on the main and one up on the pilot. Plus put on his Lockhart oil cooler on my bike for insurance. Will keep you posted. Thanks for all the help and a special thanks to ghostrider.
Trevor
 
I think the needle is good.
Try a 125 on the main to see if you can get some color on those plugs.
What temp are you running?
Good on the 47.5 pilot. No popping on decal? Should be 2.5 to 3 turns out on mixture screw.
Lean is mean but it melts engines. :eek:
 
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