SE 44 mil carb - Page 6 - Harley Forum

03fxst · #51 06-30-2009, 09:19 PM

Hey Frisco
Thanks for chasing down the inconsistency in the instructions. As for yours, I took the last first and dealt with the ignition timing. She wants 24 degrees on the C group of curves on the Dyna 200. That's 24 at 5000 WOT About 12 degrees at start and runing from 14 through 16 between two thousand and three thousand. It stopped the detonation dead.
Interestingly the Dyna instructions say to only use the C groupings for extreme applications using turbo and nitrous. In looking at the maps though the beginning of the curve is much milder as it moves up and through 5500, then it jumps up over 35 degrees pretty fast. I have my rev limit set at 5750 and never hit it so it isn't going to ever see the extreme end of the curve anyway. The Mikuni book says to go for a gentle advance curve and this seems to be it up to that point and the pinging is gone.

Now, I'll set the idle mixture and go from there.

Happy Canada Day to the Canucks in the crowd.
03FXST

03fxst · #52 07-06-2009, 05:53 PM

Figures
No one here stocks Mikuni jets. I'll have to order the pilot. They want 20 dollars at the dealer. I figure I'll find it cheaper online somewhere. Looks like my Dyno appointment will come before the new jet though. I am booked for Saturday morning. I figure AFR runs at quarter throttle increments are my best approach there. Should I raise the needle first or just see what the Dyno says as is? Predictions on where the Mik puts me in terms of a power jump?

Love this carb..
03FXST

frisco-rigid · #53 07-06-2009, 08:22 PM

Hi 03

You've not said what Idle jet is in there..
The 25 is the standard but have you checked yet to be sure.?

My Im-patience would not allow me to wait,, I would have to try something, anything,,, while waiting for the jet,, if for No other reason than just learning..
Heck, what does it hurt to raise the needle 1 notch or all the way just to know what it does with THAT particular idle jet..

I guess my point is this--- do stuff, even if it get's you no closer to a goal..
Why,, cuz then you'll know more than you did before.. And definately more than the guy that didn't do Any experimenting..
So try it, raise the needle and run, then lower it and run etc,,,,,,,, that's how we learn & get familiar with this devil..

Yeah baby

03fxst · #54 07-15-2009, 09:56 AM

okay Frisco
Adjusted as per your suggestions, one step up on the pilot jet and a notch on the needle. It feels great. I put off the Dyno run. Will let you know the AFR when I get that done.

Hold on tight..
03FXST

03fxst · #55 07-20-2009, 07:03 AM

Just came back from a three day road trip and noted a slight tuning problem with the Mik. I spend most of the time cruising at between 70 and 75. It wants very little if any throttle to maintain that speed. On downgrades it was at idle and then as the grade changed I would roll a little on. More than a few times it popped through the carb when I did that and then it was fine. What is that telling me?
I tried fiddling with the idle mixture screw when I got home last night. It adjusted in toward a richer mixture more than a full turn of the screw before beginning to bog. I backed it off a half turn and tried blipping the throttle as the book says. It popped through the carb and stalled on the third blip. First two seemed maybe slightly sluggish but so was I so I can't be certain. I figured I was too road stupid to tinker so I washed the dead bugs off instead.

summer time and the tuning is...well tuning.
03FXST

frisco-rigid · #56 07-20-2009, 02:59 PM

Hi 03

Most of us would suspect a lean prob with what you've described, it sounds too logical,, but,, once in awhile we have to change the rules----in our head---..

Remenber my description of what ALL I've done to get rid of De-cell pop in the 127".. I went SUPER rich and everywhere in between, changed timing & 3 diff ignitions, pipes, everything I could think of and was only able to cut it in half..
I haven't totally given up on it but as for now I am stumped so, for now, I just accept it cuz sometimes because of cam or flow or jeeeze, even altitude or what-freakin-ever,, a condition such as de-cell pop just simply cannot be stopped..

My Point------

If you are indeed using the best/correct idle jet And Idle-A/F adjustment,, and the Accel Pump is correct and you still get a wee bit of "lean-type" pop at throttle opening----then it might be something that only experimentation and time will eventually correct..
I have NOT had the prob you're describing so I can only sit back & shoot guesses at you..
My first guess would be to increase the Idle jet one more size if ONLY to see if the prob stops..
I'm curious,, did a 25 come installed.? Then you increased to a 27.5,,,, correct..?????
What needle is in it now.?
It might be time to go to a 96 like you were originally planning to..
You're soooo in the ballpark and soooo close to perfection now that weee fine tuning is all that's needed..
I'll offer my experience as much as I can..

More curiousity,, how much has your milage increased.? Mine increased about 15% in each motor..

03fxst · #57 07-22-2009, 08:32 AM

Hey Frisco
I have the 27.5 in. Have a 30 as well to try and I think I will try the 96 needle just for fun. On the mileage I am definately seeing improvement in the 10 percent range, maybe a little better than that but I haven't done a true test yet. I like to run a tank through under my normal riding conditions, ie city/highway week of commuting. That's my benchmark and I haven't had the chance yet. But on the three day weekend highway run I saw an improvement for sure.

03fxst

frisco-rigid · #58 07-26-2009, 07:53 PM

03

When you do the 96 you may want to drop the idle-jet back one size because the straight portion of the 96 will fatten you soon "off-idle"..
One more thing,, do not be surprised to find the Notches affect your milage even though you may Not even get over 1/8 throttle..
One freakin notch affects ours by about 2mpg at 80 and we're not even 1/8 throttle at that speed..

You seem to understand the Mik now and nothing, I am quite sure, will confound you from here on..

The student is now the teacher, Grasshopper..