Carburetor Jet Tuning - Updates on 1st Post

[roboto65]

107.5 or 108 If they had one or the other I would get either one that is so close that it would not make a difference either way since Chad has them I would get those for sure you will have it whooped !!

[L J VFR]

Hey Allen, what size main jet did you put in before MOOTmag. I remember you telling me you changed them, just don't remember the size you said.  Oh, and I had to explain the phone calls you made, my wife thinks I have a girlfriend.    LOL 

[Chad in Michigan]

i'll give 'em to ya for shipping costs, no biggie. they are like 3 or 4 something each from the stealership, and it would cost probably like 5 bucks to ship to ya. they are just sitting here so i'd like to have someone be able to use them. the 108's are true kehin jets, the 107.5's are very close in size but not true kehin jets. I forgot where I got the 107.5's from, but they use the smae scale as the kehin jets (so they say anyway) I forgot who makes the 107.5's but i'm sure i could find out. whichever ones you want, just let me know, give me an address to ship to and i'll get them out for you tomorrow. email me at chadschloss78@aol.com. talk to you later. -chad

[L J VFR]

Thank's chad.  I sent you a pm thru this site. My computer is toast at the house right now. (kids)   Lance

[roboto65]

Hey Lance don,t blame me for getting caught  LOL just kidding anyhow yeah I have the 110s on the mains and 3 shims and 45 on the idlejets I am going to change the idlejets out for 42s I think and take a shim out thinking I am a little rich on the lowend. I mkight try in this order adjust the pilot screws down to 2 and 1/2 try that then if that does not work go to the 42s.. Will keep you posted.

[L J VFR]

Sounds good Allen.  With my stock exhaust, I believe the 108 jets that Chad is sending me will work great.      Thank's again everyone for the tips on jets.  As soon as I get them, I'll install and see how it runs.  Just recently put in the 105's and it made a difference on top end.   If I had it to do over again, I think I might have kept  the stock air filter vs. K/N. -  as  everyone is starting to suggest..   Lance

[Greg Cothern]

My understanding is that the 108's are actually 107.5's....  According to a couple of sources.

[Chad in Michigan]

Hate to tell you you're wrong, greg, but they are not the same. the 107.5's are made for the kehin carb, but they are not 'kehin' jets. they are aftermarket jets. i have both jets sizes, well i had the 108's, i just mailed them today to LJ bad mag, and i still have the 107.5's i've never installed. he went to the dealer and they confirmed this as well. The 107.5's I have are EBC brand, here is a link:

http://www.phatperformanceparts.com/ProductDetails.asp?ProductCode=EBC%2DKEIHIN%2DSLOT
Right on their page it says 'these are not kehin jets, they are a high quality replacement'
the 107.5 part number is here: 1006-0141

[roboto65]

Welllllll lets see I have had sometime to check things out on mine... I have 110 jets and 45 pilots had 3 shims and 3 and 1/4 turns out on the pilot screws. I have Jardine pipes with K&N filter.

So with that going back and forth to work everyday averaging about 70 to 75 MPH pretty much my gas mileage was around say 35 or so got about 95 to 97 to reserve.  Now I have taken a shim out and adjusted to 2 3/4 turns out on the pilots LOTS better the plugs looked a little rich but not terrible just figured I would give a report back. OH I also tryed leaving the airfilter snorkle out!!!!  Well it did not like it let me tell you so for anyone thinking about it I have tryed it and it do not work !!!! 

Now with what I have done it is ALOT better alomost pulls the front end up and it goes all the way to REDLINE does it need more tweaking yeah probably but it is close for sure !!!!!!

[Greg Cothern]

I believe from our talks that a 42 pilot jet (1 size larger than stock) and 108 main jets (107.5 whatever we want to call it LoL, which is virtually 2 sizes larger than stock) with 1 additional shim on a K&N and aftermarket mufflers would be right on the money..........

[TLRam1]

Good information Allen.

I was going to ask you about this since you were playing with jetting some, thanks for the update.

You have Jardine Drag pipes, correct?

If you tweaked further what direction would you go, where would you tweak?

Do you think the Jardines and the V&H's flow the same or is one more restrictive ie: larger hole down the middle of the pipe? 

I have heard that about the snorkel, removing it will mess with your air flow viscosity and result in air turbulence instead.


Greg, everytime you and Chad would discuss the 107.5 vs 108 jets I would change All my posts. After 3 times of changing all the post and 20 times of correcting my mistakes I left it at 108 because Chad had a part number. You 2 wore me out. 

[roboto65]

Well they are the Megaphones and if  tweak anymore maybe go to the 42s like Greg has mentioned and maybe lean the Idle jets a 1/4 turn more or so but it is very close for sure!!!

[TLRam1]

I added your info below Allen and on the other long accumulative post on page 3.

Below are the results to date;

----------------------------------------------------------------------------------------------------------

This is where we are at currently.

From my readings and input from Magna owners, a stock Magna needs the DD Kit.

Pilot Jets on all could stand a change to #42 but it's on the bubble and works well enough with the stock #40's installed. Personal choice, depends on how much you want to spend and how finicky you are.

I think Greg's beliefs are, Cobra exhaust does not flow as much air as V & H's and my findings are parallel with this. This is subject to change with more Cobra exhaust testing.

I believe most of these are around 500 ft above sea level. High altitude you will have to be on the leaner side.

So far it is coming down to this.
______________________________________________________________________________

Stock Filter

Stock Exhaust

DD Kit which includes

Shims – 1 (additional)

Mains #105

Pilots screws 2 ¾ - 3 Turns out.

Option - #42 Pilot Jets

__________________________________________________________________________


K & N air filter

Stock Exhaust

DD Kit which includes

Shims – 2 additional

Mains - #105

Pilots screws 2 ¾ Turns out

Option - #42 Pilot Jets

Order another set of shims from DD so you can have a total of 2 additional shims per Needle Jet.

_____________________________________________________________________________


Currently working for a MOOT Member

K & N air filter

Cobra Exhaust

DD kit which includes

Shims – 2 (additional)

Mains - #105

Pilot screws 3 Turns out

Order another set of shims from DD so you can have a total of 2 additional shims per Needle Jet.

Option,

Not tested, IMO, I think you could comfortably change the Mains to #108 Kehin Part #99101-GHB-1080

Probably should change to the #42 Pilot Jets


______________________________________________________________________________


Allen

K & N air filter

Jardine Megaphones exhaust

Shims - 1 (additional)

110 - Mains

45 - Pilots

Pilot screws - 2 3/4 turns out


With what I have done it is ALOT better almost pulls the front end up and it goes all the way to REDLINE, does it need more tweaking, yeah probably, but it is close for sure !!!!!!

Note: possible go to 42 pilot jets and lean the idle jets a 1/4 turn more.

_______________________________________________________________________________

Chad

K & N air filter

V & H exhaust

Shims – 2 (additional)

Mains – #110 or #112

Pilots - #45

Pilot screws 2 ¾ turns out

____________________________________________________________________________


This list will probably need to be tweaked as people test and try these settings but should be better than before.   

These settings are in MOOT Member bikes and actually working so they do have history behind them but might need tweaking as we become more experienced with various setups.

[Greg Cothern]

Terry I disagree with your first 2 setup statements, if exhaust and air filter are stock then one additional shim and pilot adjustment are all that are required.

I would NOT recommend a main jet change unless a combo of K&N and muffler mod/aftermarket. 

With just K&N and muffler mod, then I would go with jets and 1 additional shim and pilot adjustment, my sons bike is setup like this and it is almost perfect.

I also will go on record and say in advance that before its all said and done that Allen will end up with 42 pilots and 108 (107.5) jets.  I personally think for K&N and higher flowing aftermarket mufflers this is going to be the BEST setup (minus the dyna-jet kit).

[TLRam1]

Greg,

Let me re-read this thread and see where I acquired the info and post questions if any arrive, no time at the moment, give me a few days. 

On Allen's I will make changes to his jetting as he updates. That's the purpose of adding his name for someone who might want to question what he has done or further advice as to his satisfaction. 

I have read many times the Magna was jetted differently for other parts of the world but leaned out for the USA? Are you or anyone familiar with this statement? I believe that's where the first post comes from.

On the second setup it does have a K & N filter but no muffler mod. I don't know where this one came from but I will check and post questions. The second setup you are saying to drop one shim and no jet, correct?

Your sons has (Edited)

K & N

Muffler Mod

Shim - 1 additional

Mains - 105

Pilot Jet - 2 7/8 Turns out

Almost Perfect.