Carburetor Jet Tuning - Updates on 1st Post

[Chad in Michigan]

there is one shim on each needle (stock) and the Dave Dodge kit supplies one additional shim per needle for a total of two.

[TLRam1]

I went back and corrected the shim numbers all my post and the carb setup post to reflect what should be correct. My mistake but went over the post numerous times and I am shimmed out! Maybe I have it right. Whoosh, hope so, let me know if you see a mistake. 

[L J VFR]

Sounds like we are finally getting somewhere with k and n and vance and hines exhaust. Thanks guys for sharing info on jet sizes and everything... When i get back from MOOTmag, and add some aftermarket pipes, i will have a good place to start... Leaving for MOOTmag shortly, wont chat until i get back... See everyone at MOOtmag...Lance

[roboto65]

Have Jardines and K&N we will see at MOOTMag LOL See ya there !!!

[L J VFR]

Hey guys, question for ya...  I'm thinking of adding the 105 jets tommorrow, but I am wondering if I should'nt go ahead and put the 107.5 jets in?  Do you think it would be too rich.. I just cut off the resonators and have a k and n air filter. This way when i change exhaust, this mod will allready be done. According to some here on the site, these jets will make it run better.. Any thoughts... Or should I just stick with the 105 jets..  Allen, what size jets did you put in before you came to MOOTmag?? Were you pleased with the way it ran??  Would 107.5 jets be wrong for my exhaust?  Too rich??    Thanks, Lance

[Greg Cothern]

We are about to switch my sons 96 jets to 107.5.  His has the muffler mod and K&N also, but with DRP 105 jets and an extra shim.  Low end is just about perfect, but the mains appear to be a bit on the lean side.

[L J VFR]

Thanks Greg...  I think i will go ahead and get the 107.5 jets then.. Coming to work this morning at 3 am (co-worker on vacation)  i had a chance to run "miss behaven" up to 104!!.. What a rush.  However, she seemed to fall off a little at around 85 and up, so i believe you guys are right about needing some more fuel at top end.. Thanks for your help... Lance

[Magnum Magna]

So what would be the effects with my resonators already removed and now add a K & N air filter.  What will I gain and lose with this setup.  I believe the previous owner have shimmed the jets.   

[Greg Cothern]

Robert, if your bike is stock except resonators removed and shims, I would NOT install a K&N.......  It will lean it out, thus requiring a jet change if you want it to run in the correct fuel to air ratio....

[ia801]

Shims are Greek to me!!!

85 VF700C with a MAC 4 into 1 header and a Dyno Jet 1119 Jet Kit.

Had alot of problems with the mains, Dynojet supplied 4 120's and 4 124's mains for this kit. My stock main jets sized at 95 for the front carbs and 98 for the rear; V4. In short, used 106 mains on the front, with the longer header flow and 102 on the rear after the baffle box from the stock exhaust was removed. MAC utilizes a 4-1 megaphone with a high flowing baffle. Had to modify the vacuum sliders by drilling an additional hole so the slider could release pressure faster.

[L J VFR]

There are 3 honda dealers in Northwest Arkansas.. When I called to make sure they had the 107.5 jets in stock, no one did..  "We can order them, be here next tuesday".. They had 110 112 125 etc.etc.              I could not believe this.  Anyone else have to order their jets to get them in??     I  decided not to wait and instead, pulled the carbs yesterday evening and put the 105 jets that i got from dave dodge in instead..    I know i should have waited, but  I am going to run these 105's for a while and keep watching plug color..   Seemed to run better on the way to work this morning, especially on top end.. I'll keep everyone informed... Lance

[Chad in Michigan]

107.5 jets are not kehin (honda) jets. 108 is. I ordered off the web so I can't say for sure if the dealer would have had them in stock.  Here is the website from Kehin, the maker of our carbs. you will see they don't make a 107.5
the main jet starts with this number: 99101-393 and is 8mm and the slow jet starts with this this number:99103-420
these numbers are kehin numbers, not honda numbers. if you order trhough honda you will need to give them their part #
the part number for the 108 jet is: 99101-GHB-1080

http://www.keihin-us.com/list.htm

[L J VFR]

They new that I needed  108 jets, because they corrected me when I asked for 107.5's.     Still, they didn't have them in stock. None of the 3 dealserships.  They also new that they were keihin jets.

[Chad in Michigan]

did you order them already? if not, i have the set that i tried in my bike for a few weeks. i upped my jets to 112's . let me know if you need them, or if anyone else may need them. i also have the 107.5 jets i ordered but never installed, 110 jets, 42 pilot jets and the stock 40 pilot jets and stock 102 main jets.

[L J VFR]

Chad, no i haven't ordered them yet.  If you want to sell them or something I would be interested.  Let me know what you want for them, or send me a pm and we can work something out man.   I would rather buy them from a fellow MOOTster than a stealership anyway.. Thanks..   Lance      P.S   Is there a difference in the 107.5 and 108 jets, or does  keihin produce them both??  Kind of confused with these jets being so close together.