Carburetor Jet Tuning - Updates on 1st Post

[BA]

Chad helped me rejet my carbs last weekend.  He put in the 105 mains, and we added two additional shims to the needles for three total on each.  Turned the d screws out to 2-3/4 turns and I added the K&N filter.  Rode it home from his house (about 60 miles) and it ran good and strong.  I still have a slight hesitation before it fully warms up, but it goes away. 

[Chad in Michigan]

Brian, I think if we upped the pilots to the next size (42) that would go away. If it bothers ya, we can try it. Let me know.

[L J VFR]

Ba, i am identical to you on your set-up. I added 2 drp shims for a total of 3 and have the pilots turned out 2-7/8 turns. I also have the k&n filter with bone stock exhaust... I think when i get back from MOOTmag i will add the 105 jets that came with the DRP kit and according to chad maybe add #42 pilots.  I guess you guys have talked me into it..

[TLRam1]

Lance,

When we talk about shims we are referring to the added shims not the original one that came on the bike. Not a problem but did want to clarify and I will change the post on your carb set-up.

[L J VFR]

Thanks Terry... I just want to make sure i let everyone know the total number of shims when we are discussing...    I have seen some confussion with this in the past..   Lance

[Magnatic]

Here's my saga;

Started with bone stock bike purchased with 11,7xx miles. Ran fine except the
often reported rough spot around 4k under part throttle.

Next added K&N, Vance&Hines, and DRP kit(105 mains and 1 extra shim). Now
the bike ran worse, very pronounced popping on accel and decel and bucking/rough
running except under hard throttle. Experimented from 2 1/2 to 3 1/2 turns out on
mixture screw, will not run right.

Next added additional shim for a total of 3 including the stock one. Ran even worse
yet, not ridable except to experiment with mixture screw settings and that was no
real improvement. I am baffled at this point as others have same set-up as my last
two attempts and their bikes run fine.

Today changed mains to 110 and pilot to 42 with 2 3/4 turns out on mixture screw.
Halleluia!! Bike runs strong with seamless powerband up to redline. I ran down to 35mph
in 5th and kept light throttle and it was smooth whereas before it would have been
very uneven. My only issue is some popping on decel so I will go out another 1/4 to
1/2 turn on the mixture screw and hopefully that will go away, but even if not, the
bike is running strong finally. Maybe when winter gets here I will experiment with the
112 mains and 45 pilots just out of curiosity, but for now I can start saving some gas
money on my 80 mile roundtrip commute.

Many thanks to this forum and the exchange of ideas that have been invaluable to me//Matt

[lragan]

Matt, after I finished modifying my carbs, it took a while for the popping on decel to completely go away.  I had made a mental note to revisit the settings to address the non-urgent issue, but now it decelerates without a whimper.  My guess is that there were deposits of carbon or other gunk that glowed a bit and caused the popping.  Once they cleared away, all is well.

[Magnatic]

That's good to know Lawrence, I'll pour some seafoam into the gastank and just ride it
for awhile as is before messing with the mixture screw. Thanks.

[Chad in Michigan]

I am using the 45 pilots/112 mains  3 shims on each needle and 3 turns out seems to be the sweet spot. I tried 2.5 and 2.75 turns but lack of power until turning out to 3 full turns. I am glad to hear that someone with the same setup took my advice. If you like it now with the power/torque, get ready for the other jets. way more off the line power and it hauls all the way up. I am no lightweight either at 325 lbs. I wondered how that setup with a lighter person would be. Glad to hear some success -Chad

Here's my saga;

Started with bone stock bike purchased with 11,7xx miles. Ran fine except the
often reported rough spot around 4k under part throttle.

Next added K&N, Vance&Hines, and DRP kit(105 mains and 1 extra shim). Now
the bike ran worse, very pronounced popping on accel and decel and bucking/rough
running except under hard throttle. Experimented from 2 1/2 to 3 1/2 turns out on
mixture screw, will not run right.

Next added additional shim for a total of 3 including the stock one. Ran even worse
yet, not ridable except to experiment with mixture screw settings and that was no
real improvement. I am baffled at this point as others have same set-up as my last
two attempts and their bikes run fine.

Today changed mains to 110 and pilot to 42 with 2 3/4 turns out on mixture screw.
Halleluia!! Bike runs strong with seamless powerband up to redline. I ran down to 35mph
in 5th and kept light throttle and it was smooth whereas before it would have been
very uneven. My only issue is some popping on decel so I will go out another 1/4 to
1/2 turn on the mixture screw and hopefully that will go away, but even if not, the
bike is running strong finally. Maybe when winter gets here I will experiment with the
112 mains and 45 pilots just out of curiosity, but for now I can start saving some gas
money on my 80 mile roundtrip commute.

Many thanks to this forum and the exchange of ideas that have been invaluable to me//Matt

[TLRam1]

Matt,

Thanks for reporting back your results, it adds more credence to what Chad has stated.

That's good to hear, especially since the challenges you had to overcome.

Matt,

You have

K & N

V & H exhaust

Shims - 2 (additional)

Pilot - #42

Mains - #110

Pilot Screw - 2 3/4 turns out



Chad beat me to it, as I was typing he responded. I was going to list tyhe difference between you and Chad.


Chad,

I would like to clarify, you added 3 shims in addition to the stock one, correct?

[Chad in Michigan]

No, only running a total of 3 shims. i'd wonder what it would do if there were 4 total.. hmmm. maybe i'll try it for kicks one day. but to reiterate, 3 shims total on each needle, 45 pilots, 'd' screws 3 turns out and 112 mains.

Matt,

Thanks for reporting back your results, it adds more credence to what Chad has stated.

That's good to hear, especially since the challenges you had to overcome.

Matt,

You have

K & N

V & H exhaust

Shims - 2 (additional)

Pilot - #42

Mains - #110

Pilot Screw - 2 3/4 turns out



Chad beat me to it, as I was typing he responded. I was going to list tyhe difference between you and Chad.


Chad,

I would like to clarify, you added 3 shims in addition to the stock one, correct?

[Magnatic]

Chad,
I'm sure the lure of more power will have me trying the 112's and 45's, but
I wanted to start with the next step up first for comparison purposes. Of course
I did buy the 45's and 112's at the dealer already, so it's just a matter
of time.//Matt

[TLRam1]

Got it Chad, maybe I am the one using the wrong terminology that's why it was confusing to me, anyway I changed all Shims numbers to additional shims.

If I am the one using the wrong terminology I may need to go back and re-change or add a "total of", to the number of shims.

[Chad in Michigan]

After the jets, the next thing for performance that you will love is the Dyna 3000 ignition module. there are 10 preselectable timing advance curves, and a chart that shows just what each curve does. i am on setting #4 right now which starts initial timing at 1500 rpm instead of 2000 and the curve is steeper than the stock curve. it also has preselectable rev limits (i have it set at 11k) and it elimates the stock timing retard of 5 degrees at 9500 rpm which helps out top end a bunch. on the factory setup, when you get close to redline the ignition module retards the timing and the bike began to slow up a bit. it has been dyno proven to add an addional 2-3 hp at the wheen just by adding this. i am also running premium gas, which with advanced timing helps the burn slow up a bit. if i run 87 i notice it is a tad bit slower with not as much power. if you want to save on gas and not run premium, you can just set the dial on the Dyna back to the stock setting and choose not to advance the timing/mess with the curve. It's the best of both worlds. performance at your fingertips hope this helps. -chad

Chad,
I'm sure the lure of more power will have me trying the 112's and 45's, but
I wanted to start with the next step up first for comparison purposes. Of course
I did buy the 45's and 112's at the dealer already, so it's just a matter
of time.//Matt

[TLRam1]

 I am still working to correct this shim issue. Refresh my memory, does the DD Kit come with 1 or 2 Shims per Needle Jet?