SuzukiSavage.com - Jetting question

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Jetting question 11/20/16 at 19:53:27 Okay, so, on a warmer day I got 90 MPH. Today, at about 60 degrees and around 80% humidititty 80 was it. So, am I lean?
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Kenny G

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Re: Jetting question
Reply #1 - 11/20/16 at 20:44:30

Justin,

I wish I knew the answer to lean conditions affection MPH & MPG.

I can get 90 MPH any day without regard to weather conditions, but I am not doing it often.

I have not been happy with the gas mileage on my S40 which varies between 43 & 44.5 MPG. I have considered reducing the size of the main jet figuring that I may be running a little on the rich side.

Yesterday I removed the spark plug and it doesn't appear to have been running too rich. Here is a picture, which is not very good, the plug is tan.

I have a tendency to keep the RPMs up so if I get into a tight spot I have instant acceleration and I am thinking that is using more fuel than some riders.

Kenny G

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IMG_0661_001.JPG

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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5051 Manteca , CA Gender:	Re: Jetting question Reply #2 - 11/20/16 at 20:58:43 High humidity, moisture displaces air and can condense at air filter but can be beneficial to combustion,I thinking a tad rich, look at the plug and then you will know.
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Ruttly Serious Thumper Offline Thumpers Rule Posts: 5051 Manteca , CA Gender:	Re: Jetting question Reply #3 - 11/20/16 at 21:02:35 Remember you can not jet for all conditions , just find the sweet spot that work good !
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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Jetting question Reply #4 - 11/20/16 at 21:45:06 Kenny, that plug looks just fine. If you keep your RPMs as low as possible (without lugging the engine), you'll get better mileage.
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Jetting question Reply #5 - 11/20/16 at 21:48:13 Colder air = denser air. More air per unit of volume. More humidity = more water saturation in the air (less room for the air) At 60 degrees, you should theoretically be faster than at 90 degrees (providing the humidity is the same or less).
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Jetting question Reply #6 - 11/20/16 at 22:48:47 60 degrees, you should theoretically be faster than at 90 degrees (providing the humidity is the same or less). Back to top Swat I was thinking
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LANCER Serious Thumper Alliance Member Offline Savage Beast Performance Parts Posts: 10620 Oklahoma Gender:	Re: Jetting question Reply #7 - 11/21/16 at 02:10:09 All engines are not created equal, some are just faster than others. However, it would not hurt to put in the next larger size main jet to see if you are running lean. What is your current main jet .
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Jetting question Reply #8 - 11/21/16 at 07:23:04 What is your current main jet ? IDK, Reelthing put it in when he did the cam. Idle is stock. IDK about the idle air. Just crossed 5,000 miles, valves ma y not be opening up fully. I do have a windshield and bags, and I don't tuck in so fully.. but, all that is true on the day I ran 90.
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Dave YaBB Moderator ModSquad Offline SuzukiSavage.com Rocks! Posts: 17899 Camp Springs, Kentucky Gender:	Re: Jetting question Reply #9 - 11/21/16 at 08:45:28 A calm wind can make a big difference. A 5 mph wind is barely noticeable - but if it was at your back when you were doing 90mph and in your face when you could only do 80mph.....that could splain it!
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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Jetting question Reply #10 - 11/21/16 at 17:39:10 Wind resistance (drag) will make a HUUUGE difference with a motorcycle. We are about as aerodynamic as a brick. A motorcycle drag coefficient is usually around 0.9-1.0!
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

Ruttly Serious Thumper Offline Thumpers Rule Posts: 5051 Manteca , CA Gender:	Re: Jetting question Reply #11 - 11/21/16 at 19:42:18 Kris , And that's without bags & windshield !
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Jetting question Reply #12 - 11/22/16 at 02:52:51 When the cop escorted me to the pack of riders it hit 90. But, the point about the little breeze is well taken. I did pull the choke a bit, but was running out of room and didn't get to really feel of it.
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Kris01 Serious Thumper Offline Eat, sleep, RIDE! Posts: 3767 Tennessee Gender:	Re: Jetting question Reply #13 - 11/22/16 at 18:43:32 Ruttly wrote on 11/21/16 at 19:42:18: Kris , And that's without bags & windshield ! I wonder how bad it would be with bags and a shield.
Back to top	There's no problem that a full tank of gas and a sunny day can't fix! 2008 S40, Rotella T 15W-40 w/ZDDP added, Dyna, 140/90-15, Battery Tender Jr., Seat lift, #52.5/150/3 washers, Raptor IP Logged

MMRanch Serious Thumper Offline Evil flourishes if Good Men do Nothing. Posts: 5775 LYNCHBURG TN Gender:	Re: Jetting question Reply #14 - 11/22/16 at 20:03:02 I have Bags and a Windshield , sizes : 50 and 150 jets , and a stock motor w/valves adjusted .003 . Flat ground on a windless summer day equeals about 85 is top end with standard pulleys.
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