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Message started by markrider on 12/11/06 at 15:18:53

Title: 2005 Suzuki S40 Carb Question
Post by markrider on 12/11/06 at 15:18:53

Hi,
I'm new th this forum, I bought a 2005 S40 about a month ago with only 600 miles on it. I've had the pleasure of owning many different bikes over the last 40 years, including an 88 Savage, Honda GB500 and a 1970's SR500 Yamaha Thumper. I really liked the Savage when I owned one for a short period of time back in the late 80's . Can't tell you how glad I am to be getting back on an almost new 2005! (Now this will be my only bike!)
Great forum-I am hoping to get your expert opinions about how I should proceed. Here is my situation: 2005 Savage -I installed a K&N panel filter, and I purchased a Supertrapp-I plan to install 6 discs. The 40 mm carb specs from Suzuki say that the 2005 Mikuni BS40 has a 145 main jet and a 52.5 pilot jet .
What is the best way to dial the carb in with the above mods? Basically I,m doing backroads of NJ rides, no more than 1500 ft above sea level. I'm thinking 1/2 size spacer, 147.5 main and 55 pilot- should I go with a 150 main? Are the newer Mikuni carbs set up to run leaner than the older Mikuni Savage carbs? Look forward to hearing from you. Thanks.
markrider

Title: Re: 2005 Suzuki S40 Carb Question
Post by steelwolf on 12/11/06 at 16:04:09

Welcome aboard. If you are going to upgrade and open the airflow then you have to richen the mix on an already lean bike (seems you already know this). JMO, the 147.5 main will not be big enough with the air flow upgrades. It would probably work well on a stock set up but with the bikes being lean from the factory you may want to try at least a 150 main. Maybe even a 152.5 though that may be too much with baffles in the pipe. The 55 pilot should be fine. Happy motoring!

Title: Re: 2005 Suzuki S40 Carb Question
Post by orrin7 on 12/11/06 at 17:03:37

I have a 2005 s40 with a screaming eagle muffler. and stock air filter. I plan to change the filter to a k and n .
I am also located in NC. I went to a 152.5 main jet with the stock pilot . The main jet is perfect but i need a little larger pilot. I did not do the white spacer mod but i did adjust my idle mixture. My bike seems to be great but i do think the pilot would help me. Maybe I have been just a little help to you.

Title: Re: 2005 Suzuki S40 Carb Question
Post by Reelthing on 12/11/06 at 17:24:26

Most will run correct with the stock pilot jet - it's the height of the needle that is going to effect the mid range the most - these mikuni's do not have a needle any longer with groves to move the c-clip up and down thus adjusting the midrange mixture - so we just knock about half the spacer off lifting the needle to richen the midrange mix.

Title: Re: 2005 Suzuki S40 Carb Question
Post by geo on 12/12/06 at 21:44:06

The most impressive performance change you will make to this motorcycle is the addition of the SuperTrapp. You can run this for a while before you have to re-jet the carb. Don't go too long, or your pipe will start to yellow toward turning blue. Starting at 6 discs is about right.

I re-jetted with the Dynojet kit, which gives you lots of jet options. After re-jetting, I moved out to 10 discs.
I clean and change the discs frequently looking for a combination that has the least black soot. I had the 10 discs for a while and still got some soot, so I went to 13. My spark plug looked very good at 13 but I haven't run the 13 long enough for another disc check.

The K&N air filter will give you noticeably more power at higher engine speeds when the demand for air is greater. Same thing happened when I put the K&N on my Miata. :D

You should be aware that your gas milage will decrease as you continue to chase more power. The best milage I got with the stock Savage was 46mpg. I ride only in town, no long highway runs. My milage after upgrades is about 42mpg.

After these changes, you will not be able to resist opening the throttle a lot more when an opening appears in front of you, so open your wallet for more rear tires and fuel. :-/

Title: Re: 2005 Suzuki S40 Carb Question
Post by Savage_Rob on 12/13/06 at 05:48:58

I would not go more than possibly one size larger in the main jet with the stock muffler still in use as you probably won't get enough airflow for the additional fuel and Reelthing is correct in that the midrange is what is generally the leanest at stock. That requires the white spacer mod. I would advise against the DJ kit unless you will definitely take advantage of the free dyno run coupon included in it or unless you just like spending money unnecessarily. Jets are basically about $3 - $4 each. The only thing I did like about the DJ kit was the adjustable needle. If you get a freer flowing exhaust, you'll need a larger main jet. There are a lot of good exhaust options, of which the SuperTrapp is only one. You can learn about many of them by doing some searches on the site. A larger pilot jet should only be needed if you cannot adjust the idle mixture (not the idle speed) properly with the existing jet. Please read the threads in the Tech Ref forum dealing with carbs and the white spacer. Also read Lancer's simple carb tuning thread. Following it can prevent a lot of frustration if you're not already accustomed to tuning carbs.

Title: Re: 2005 Suzuki S40 Carb Question
Post by Hashbrown on 12/13/06 at 12:58:00

Awesome decision getting the supertrapp. I just installed mine and it runs amazing! I really think im going to kill myself next spring cause this bike flies.

Personally I would up the number of discs. I have 9 and i love it. Its loud, gets everyones attention (even cagers) and its hilarious to have a relatively small bike make a beefier sound then most HDs. Why spend the money in getting a supertrapp when your only using a fraction of its potential.

So far I've done the .5 spacer mod, K&N cone filter, supertrapp (9 discs), and im useing a 155 main and 55 pilot. Its running a little rich but i can tune that. You definately need a larger main jet. At least 152.5. I live in NH which is a couple 100 feet above sea.

The most important thing is to tune your carb when you finish. I would try to do all the modding in one sitting before you tune.

You're gonna scare yourself when you're done, its that powerful. Good luck!

Title: Re: 2005 Suzuki S40 Carb Question
Post by Savage_Rob on 12/13/06 at 13:12:39

It is definitely a noticeable difference.

Title: Re: 2005 Suzuki S40 Carb Question
Post by lancer on 12/14/06 at 09:23:09

Main jets are cheap so just get the 150 & 147.5 both. Try the 150 and if the engine bogs down at wide open throttle (use 3rd or 4th gear) then you know it is too rich, so go down 1 size and retest. If it does not bog down then try the next larger size jet. You want the main jet one size smaller than the size that bogs.

Title: Re: 2005 Suzuki S40 Carb Question
Post by vroom1776 on 12/14/06 at 09:53:16

hey lancer,

i'm running the 250 main in the 38 mm mik. you sold me (well, I was until I removed the engine...). It doesn't bog down till past redline. think I still oughta drop one more?

Title: Re: 2005 Suzuki S40 Carb Question
Post by lancer on 12/14/06 at 10:04:34

vroom1776 wrote:

hey lancer,

i'm running the 250 main in the 38 mm mik. you sold me (well, I was until I removed the engine...). It doesn't bog down till past redline. think I still oughta drop one more?

If it is good up through redline you should be good to go as is, but also check the plug and see what it has to say. If it looks a bit dark (rich) then drop down 1 size. It could be just a hair on the rich side and going slightly leaner might crisp it up for you some.