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Message started by Rembrandt on 05/29/13 at 11:32:17

Title: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/29/13 at 11:32:17

Hi, I'm new to the forum and just bought an 06 Boulevard with only 2270 miles, so not ridden much and very quickly it has developed lurching or hesitation issues in gears one through three. It has the original petcock. I've tried high test gas and a fuel additive with no change. I've done fairly extensive reading here so far regarding the ultimate advisability of changing out the stock petcock for the Raptor, but do my symptoms sound like petcock problems? dirty carburetor / jets? I've already set up my idle and lean mixture as recommended. Thanks for your help. I'm loving my bike! It's been ten years since my last one. I've added another 1400 miles to the bike in two and a half weeks. It runs great on the highway, fourth and fifth gears. thanks Rob

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Dane Allen on 05/29/13 at 11:43:47

I have a new bike and have noticed the same thing and I've been trying to isolate when it happens. I think I am too sensitive to worrying about over doing the RPM and drive in too high a gear for the speed and weight. Also, if I cut out the choke too soon then I really notice it but once it warms up the issue seems to go away. I always get the Shell 87 and they post no notices about ethanol. Also, this effect is very strong when I don't use the choke after the 1 minute warm up.

I just did a valve adjustment last night so I will see if that helps out at all.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Serowbot on 05/29/13 at 11:59:43

Lurching shouldn't really be gear related... it should be rpm related...
if it's only in some gears,.. you are likely running in the wrong gear for that speed... ...downshift...
;)...

Title: Re: 2006 Boulevard s40 hesitation issues
Post by justin_o_guy2 on 05/29/13 at 12:01:58

& some "hesitation" could be your expectation that it should start to accelerate when the grip gets twisted. If theres slack in the cable it will feel like its lagging a bit coming out of a corner.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/29/13 at 13:50:32

It's not on acceleration per se that the lurching happens; it's while holding the gear in a crusing speed in town (obviously since it's the lower gears that seem most affected). I've tried riding in the lower gears at different rpms to determine any differences. Very little noted. So it's not likely carb or petcock related? The response regarding this being an rpm issue makes sense. Since there's no tach I've been going by sound and feel. I've been shifting bikes for some time and believe I have it about right. Please tell me correct mph for gears one through five to double check this. Thanks for your thoughtful responses thus far. I've been wondering if the too few miles in seven years has an impact at all.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/29/13 at 13:54:47

Oh, and regarding potential slack in the throttle cable, this doesn't seem to be an issue at all. The throttle is incredibly responsive throughout all gears. Low and mid-range torque is incredible.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by apache snow on 05/29/13 at 13:59:01

Sometimes a lean fuel mixture can cause un-even running at a light throttle steady speed. Try turning the fuel mixture screw out some.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Dave on 05/29/13 at 14:05:01

My bike had a really uneven "surging" at low throttle openings, and it was most noticeable in the lower gears as you slowly accelerated away from a stop. If you cranked open the throttle it was fine - but gently rolling on the throttle and it did not ride smooth.

For my bike the solution was to remove one of the three washers and raise the slide needle by only ising two washsers on the needle.

If you have not yet done the modificaiton to the spacer.......I suggest you give that a try.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/29/13 at 14:22:59

The spacer modification/needle advice...I'm not really sure what mod this is. And I have used about two half turns on fuel mixture screw...it was already drilled out when I bought the bike. I'm afraid to make it too rich.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by apache snow on 05/29/13 at 14:25:34

Just don't go over three turns out from fully seated. And when you seat the screw just lightly seat it. Do not crank it down as you will damage the taper.

Look in the tech section under table of contents and check out carb tuning.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/29/13 at 14:27:35

What position is fully seated?

Title: Re: 2006 Boulevard s40 hesitation issues
Post by apache snow on 05/29/13 at 14:29:50

Turned all the way in clockwise to the right.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/29/13 at 14:31:03

All the way to the right or clockwise, correct? I turned screw couter-clockwise without even thinking about how much or little this screw had been turned before I bought the bike. So I guess it makes sense to go clockwise all the way then incrementally turn it counter-clockwise with, ultimately three turns max?

Title: Re: 2006 Boulevard s40 hesitation issues
Post by apache snow on 05/29/13 at 14:34:08

Correct. Usually start at 1 &1/2 turns then turn out in small increments till it runs well not to exceed three turns. If you have to go more then three turns you need to go up one size on the pilot jet. Which is not likelly. How high above sea lever are you?

Title: Re: 2006 Boulevard s40 hesitation issues
Post by justin_o_guy2 on 05/29/13 at 14:39:06

Yea, 3 is max & when ya close it, be very gentle. That thing is soft, the pointy little tip will booger up.,.fingertips on a small screwdriver.
As for what speed/what gear, if youve been riding, youll know, Its a single, torque is its game, not high rpm. If you shift up & lay on the juice & it doesnt accelerate away, youre too slow for that gear/throttle combo.
YOu can shift up at low speeds, just dont ask it to haul butt. Just like driving any standard. But, for a frame of reference, 10 MPH t 2nd, 20 to 3rd, etc. & you wont have a problem if youre just oozin along,, If youre trying to get to 60 as quick as ya can, youll do it different,

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Routy on 05/29/13 at 19:01:06

There is a simple test you can conduct for the irratic running you are experiencing, its called the "choke" or "power inricher"

While the engine is running irratically, pull the choke 1 knotch.
If that helps, or fixes it, it is suffering from a lean fuel condition in the low to midrange throttle position, same as many of these bikes suffer from.
As said above, the white spacer mod usually fixes this problem very well.
I know it fixed mine.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Bubba on 05/30/13 at 09:18:31

I dunno, my '06 acted the same way when I bought it...put a raptor on and it went away...
you can test by running it on PRIME and see if it helps...but it's not the complete test...that would be this...

http://suzukisavage.com/cgi-bin/YaBB.pl?num=1251932429/1

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/31/13 at 19:05:57

So Bubba you had the identical symptoms with your 06 and the Raptor completely cured it? When did you buy your bike and with what mileage? I have wondered if the petcock may be an issue already. Thanks for your input.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Rembrandt on 05/31/13 at 19:16:59

So just another question regarding setting stock petcock to Prime. Other than not having a reserve, I won't flood the carburetor or do any kind of damage to the bike running it completely on prime for a couple of days or longer? I religiously watch my mileage so it never gets to reserve other than the twice it's happened. First time literally two blocks from the stealership I stalled out and had to switch to reserve...nice shock...not impressed and no apology or concern from the place I bought it. Second time I was purposely trying to see how far I could get on gas before needing reserve. Both times it took a bit of cranking to get the bike fired up again. Thanks for the advice and help.

Title: Re: 2006 Boulevard s40 hesitation issues
Post by justin_o_guy2 on 05/31/13 at 20:34:25

As long as the carb float valve is working properly there is no problem with Prime, except as noted,, youve got No REserve,,

Title: Re: 2006 Boulevard s40 hesitation issues
Post by Bubba on 06/01/13 at 06:05:53

Well they sound similar anyway...when I first got the bike (owned it maybe 2 weeks) it ran great...as the weather started to cool around here I began riding to work and in the mornings I would notice it starting to stumble and lurch a little.
The first couple times I rolled up to a light and rolled off the throttle it would just die...I'd fire it back up and it would get me to work but I found myself feathering the throttle whenever I came to a light.
When I would leave work the temperature was warmer and the bike ran great.
did this for about a week...got fed up, ordered the raptor (my very first mod) and it has never happened again... it was a cheap easy fix and wasn't going to hurt anything so why not?

Title: Re: 2006 Boulevard s40 hesitation issues
Post by apache snow on 06/01/13 at 06:14:44

Mine did the same thing when I first got it. Ran fairly well till it got cold out side. Then I discovered the fuel screw was only turned out 1 & 1/2 turns. Turning it out to 2 & 1/2 turns really helped. Of course I re jetted later and added a raptor. :)