SuzukiSavage.com - Surging at a constant speed....

raydawg

Serious Thumper

Offline

SuzukiSavage.com
Rocks!

Posts: 11551
pacific northwest
Gender: male

Surging at a constant speed....
02/25/15 at 14:55:30

It seems if I try and hold a steady throttle, the bike wants to move up, or down....
It is not a miss as far as I can tell, I am thinking it is just a quirk of the torqiness (is that a word?) of this motor....
it responds readily to throttle, and I have the raptor, so I am guessing that is all it is....what do you think. Anybody else know of what I am talking about?

Back to top

“The biggest big business in America is not steel, automobiles, or television. It is the manufacture, refinement and distribution of anxiety.”—Eric Sevareid (1964)

IP Logged

Yoshi Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 874 LongIsland, N.Y. Gender:	Re: Surging at a constant speed.... Reply #1 - 02/25/15 at 15:03:29 I had the surging that your talking about after i put a cone filter on my bike and the pilot jet was a 52, it went away as soon as i changed to a 55 pilot
Back to top	IP Logged

bobert_FSO Senior Member Offline SuzukiSavage.com Rocks! Posts: 421 Wichita KS Gender:	Re: Surging at a constant speed.... Reply #2 - 02/25/15 at 15:06:42 Surging is usually a symptom of the carb being too lean at the throttle position where the surging occurs.
Back to top	IP Logged

verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: Surging at a constant speed.... Reply #3 - 02/25/15 at 15:14:25 look up the white spacer mod in the tech section.
Back to top	Versey's Place Tech Section Index IP Logged

Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28660 Tucson Az Gender:	Re: Surging at a constant speed.... Reply #4 - 02/25/15 at 15:31:47 ...or if this is a new symptom, and it was fine before,... your slide may be sticking...
Back to top	Ludicrous Speed !... ... ... IP Logged

verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28886 L.A. California Gender:	Re: Surging at a constant speed.... Reply #5 - 02/25/15 at 16:01:36 Before any mod's.... always clean your carb.
Back to top	Versey's Place Tech Section Index IP Logged

raydawg

Serious Thumper

Offline

SuzukiSavage.com
Rocks!

Posts: 11551
pacific northwest
Gender: male

Re: Surging at a constant speed....
Reply #6 - 02/25/15 at 16:33:43

Seems to me it has always done this a little bit from day one with zero miles, not sure as I was use to the pretty mundane power on the 250 rebel.
It did sit for a few weeks not ridden while the weather was bad. It has 14000 on it now and the carb is a virgin, haven't touched her.
Gas out here on the island can seem a little iffy too, not as much turn over of the fuel holding tanks like the mainland. I know it gummed the poop outta my lawnmower and generator, had to clean those carbs.

Maybe i will do some deeper maintence on her soon....

Thanks gang!

Back to top

“The biggest big business in America is not steel, automobiles, or television. It is the manufacture, refinement and distribution of anxiety.”—Eric Sevareid (1964)

IP Logged

Dave

YaBB Moderator
ModSquad

Offline

SuzukiSavage.com
Rocks!

Posts: 18099
Camp Springs, Kentucky
Gender: male

Re: Surging at a constant speed....
Reply #7 - 02/25/15 at 16:44:48

My bike when I first got it had that surge at very light throttle settings. When you accelerated at a moderate pace or quickly it would run great - but when you tried to accelerate at lower throttle settings it surged.

I changed to #50 pilot, #150 main and I replaced the white spacer with the 3 washers as suggested. I still has the surge and tried several different jet combinations - but taking out one additional washer to raise the slide needle is what cured the surge for me. The reason is that raising the needle makes the mid range mixture richer....while changing the pilot alone makes the low end richer and changing the main jet makes the high end richer.

Back to top

Someday I will be old......But not today!

IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Surging at a constant speed.... Reply #8 - 02/25/15 at 16:45:25 If you think it's worse than before I'd dose it with Seafoam a few times. Sure enough get fresh gas in it if you have a doubt about it.
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

Dave

YaBB Moderator
ModSquad

Offline

SuzukiSavage.com
Rocks!

Posts: 18099
Camp Springs, Kentucky
Gender: male

Re: Surging at a constant speed....
Reply #9 - 02/26/15 at 03:34:32

A couple years back I installed an oxygen sensor to help me get the jetting correct on my bike. It really helped me to understand how the mixture adjustments work and which jet affects the mixture at different throttle settings.

Correctly jetting the carb is a fairly long process - but I do believe that with a stock bike, stock air cleaner and relatively stock exhaust system you can get within a jet or two using the jets that I ended up with. (Cone filter and open exhaust guys are on your own).

I would start with a #50 pilot, #150 main and three #4 washers in place of the white spacer. Then adjust the idle fuel mixture using the method shown in the following video. If you still have the off idle surge - then take out one washer from under the slide needle. I don't want to suggest that you should only have 2 washers - as a lot of folks have success with 3 washers....and the economy of the engine is greatly affected by where the slide needle is located. If you have the needle too high your mixture will be rich and the economy will suffer as a result.

https://www.youtube.com/watch?v=YxpQjDQzX7g

Back to top

Someday I will be old......But not today!

IP Logged

raydawg

Serious Thumper

Offline

SuzukiSavage.com
Rocks!

Posts: 11551
pacific northwest
Gender: male

Re: Surging at a constant speed....
Reply #10 - 02/26/15 at 16:09:53

Paid a little more attention to the bike this morning riding to and from work.
Odd as it seems, it only does it when I am going downhill. Not on level ground or pulling a grade. Not sure how that plays into it.
It is almost like I am lugging it, however, I know I am not..... I think Cheesy

It rides well, it is not so much of a surge that it is unsafe, just a quirky thing.... on my short rides anyway.

Thanks all.... appreciate the input.

Back to top

“The biggest big business in America is not steel, automobiles, or television. It is the manufacture, refinement and distribution of anxiety.”—Eric Sevareid (1964)

IP Logged

Rembrandt

Full Member

Offline

SuzukiSavage.com
Rocks!

Posts: 107
Peterborough, Ontario, Canada
Gender: male

Re: Surging at a constant speed....
Reply #11 - 02/27/15 at 17:44:21

verslagen1 wrote on 02/25/15 at 15:14:25:

look up the white spacer mod in the tech section.

plus one on that...My bike surged the first week I brought it home from the bike shop upon purchase. The white spacer mod literally got rid of it. My bike only seemed to noticeably surge while riding in town in gears two and three. The surging was incredibly annoying and I dreaded hitting any towns on my rides.

Back to top

A hundred years from now, none of this will matter.

IP Logged

raydawg Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 11551 pacific northwest Gender:	Re: Surging at a constant speed.... Reply #12 - 02/28/15 at 06:58:11 Jets/spacers seem the way to go on this. Dave was really helpful, Thanks to all of you. Will get some and do a spring tune-up, etc, soon. Again, THANK YOU all
Back to top	“The biggest big business in America is not steel, automobiles, or television. It is the manufacture, refinement and distribution of anxiety.”—Eric Sevareid (1964) IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Surging at a constant speed.... Reply #13 - 02/28/15 at 11:45:21 Ray, that emoticon is creepy.. just saying..
Back to top	The people never give up their liberties but under some delusion.- Edmund Burke. IP Logged

raydawg Serious Thumper Offline SuzukiSavage.com Rocks! Posts: 11551 pacific northwest Gender:	Re: Surging at a constant speed.... Reply #14 - 02/28/15 at 18:38:31 justin_o_guy2 wrote on 02/28/15 at 11:45:21: Ray, that emoticon is creepy.. just saying.. Sorry.......
Back to top	“The biggest big business in America is not steel, automobiles, or television. It is the manufacture, refinement and distribution of anxiety.”—Eric Sevareid (1964) IP Logged