SuzukiSavage.com - High RPM sputtering

Chadjac

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High RPM sputtering
09/10/11 at 13:35:35

First time poster.

I bought a '98 LS650 Savage earlier this year. It only had 5k miles on it and ran perfectly. Then about 3 weeks ago while riding home from work it acted like it was stalling when I hit 50 or so. It only happened a few times and seemed to go away. Now it happens all the time it gets into higher RPMs like before a shift, even just sitting in neutral and rev'ing it.

I've read the 'test your petcock' and I've already changed the plug, fuel and vac line, and just today replaced the stock petcock with a Raptor. But its still doing it.

So assuming I want to do this myself, whats the next thing to try?

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Oldfeller--FSO

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Re: High RPM sputtering
Reply #1 - 09/10/11 at 14:33:36

Put some Seafoam in your gas tank for at least one full tank of gas.

Clean (blow out) your air filter (or replace it) very very plugged up air filter can do that sort of stuff.

Rap 3 times on the float bowl with a big screwdriver handle to remove a sticky float from play.

If nothing changes, then you are mebbe looking at a carb teardown.

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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28651 Tucson Az Gender:	Re: High RPM sputtering Reply #2 - 09/10/11 at 15:28:09 air filter clean?... if so,.. I'd guess at a sticky needle slide, or partially clogged main jet....
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: High RPM sputtering Reply #3 - 09/10/11 at 15:37:43 FWIW, Ive been known to sputter a bit when I get too wound up..
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Chadjac YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 5	Re: High RPM sputtering Reply #4 - 09/10/11 at 16:50:49 Thanks for the replies. I removed the air filter just to see if that helped and it didn't. I'll try Seafoam tomorrow. Forgot to mention the sputtering completely goes away if I pull the choke halfway out. But then it rev's high at a stop.
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Re: High RPM sputtering
Reply #5 - 09/10/11 at 19:53:39

Chadjac, We don't have many electrical questions on here, because there are so few electrical problems. If it were an older bike with points or a car I would say it's electrical. It seems to me you have checked the worst culprits. I believe it could be your coil breaking down or a bad plug wire leaking sparks. While it's unlikely, the compression release could be leaking a little. Just thinking out loud. I don't know for sure. hth

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Re: High RPM sputtering
Reply #6 - 09/11/11 at 09:18:42

Dumb thought, but .....

Have you ever adjusted your valves? Ever adjusted your starter solenoid adjustment (lifts exhaust valves when starting)

Something about doing it 180 degrees off on top dead center is ringing a faint bell, mebbe .....

I dunno, but have you adjusted your valves lately by any chance?

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Mebbe a better way to state the question is this:

What work have you done to the bike since just before this symptom begain?

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Chadjac YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 5	Re: High RPM sputtering Reply #7 - 09/12/11 at 07:59:14 Nope, before this all happened I didn't change anything on the bike as it was running perfectly. The Seafoam didn't seem to change anything. While I want to fix this myself diving into electrics or a carb teardown isn't something I'm comfortable with. I guess I'll have to take it to a local shop.
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verslagen1

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Re: High RPM sputtering
Reply #8 - 09/12/11 at 09:10:27

Chadjac wrote on 09/10/11 at 16:50:49:

Thanks for the replies.

I removed the air filter just to see if that helped and it didn't. I'll try Seafoam tomorrow. Forgot to mention the sputtering completely goes away if I pull the choke halfway out. But then it rev's high at a stop.

Removing the air filter probably made it worse?
If you pull the choke and it goes away, it's a lean condition.
You probably need to pull the carb and clean it.
Or at least drop the bowl and pull the main and pilot jets.
Seafoam is good for this, but if you got something that won't disolve, you gotta go in there.

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AZSGT

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Re: High RPM sputtering
Reply #9 - 09/12/11 at 13:10:35

Oldfeller--FSO wrote on 09/11/11 at 09:18:42:

Dumb thought, but .....

Have you ever adjusted your valves? Ever adjusted your starter solenoid adjustment (lifts exhaust valves when starting)

Something about doing it 180 degrees off on top dead center is ringing a faint bell, mebbe .....

I dunno, but have you adjusted your valves lately by any chance?

================

Mebbe a better way to state the question is this:

What work have you done to the bike since just before this symptom begain?

How would I adjust my starter solenoid Old Man????
I have recently had starting issues and figure this is as good as preventive as any?
Search turned up ZIP

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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: High RPM sputtering Reply #10 - 09/12/11 at 13:18:40 AZSGT wrote on 09/12/11 at 13:10:35: How would I adjust my starter solenoid Old Man???? I have recently had starting issues and figure this is as good as preventive as any? Search turned up ZIP I think he meant decomp solenoid, as you can't adjust the stater relay except with a hammer.
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Re: High RPM sputtering
Reply #11 - 09/12/11 at 14:20:59

Before you rush into fixing anything else, just list what you worked on just before the symptom started. Something cause your problem to begin, and you have already fixed all the logical items so now we are looking for "other" causes.

Mis-adjusted valves was just an example of what could mebbe do your symptoms, as was a decomp solenoid actuation gap setting that was mis-adjusted at the cable (but it is measured at the solenoid core).

(Verslagen and you both need to read what I said, not your interpretation of it which was kinda strange really)

Doing your valve adjustment accidentally 180 degrees from top dead center (it looks right, but isn't -- has been done before too) is just one of the little things that can happen that can mysteriously make your bike run like shite.

Like they say, sometimes shite just happens .....

So, tell us what you worked on right before it started.

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AZSGT

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Re: High RPM sputtering
Reply #12 - 09/12/11 at 14:48:18

verslagen1 wrote on 09/12/11 at 13:18:40:

AZSGT wrote on 09/12/11 at 13:10:35:

How would I adjust my starter solenoid Old Man????
I have recently had starting issues and figure this is as good as preventive as any?
Search turned up ZIP

I think he meant decomp solenoid, as you can't adjust the stater relay except with a hammer. Cool

LOL funny enough I tried that when I had starting issues. I think I need to adjust my decomp too. Or not. Yesterday went out to start bike. NO GO. I put it in fifth and rolled back down the driveway, and let the clutch out forcing engine to cycle. Is this indicative of decomp issue?

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Oldfeller--FSO Serious Thumper ModSquad Offline Hobby is now "concentrated neuropany" Posts: 12671 Fayetteville, NC Gender:	Re: High RPM sputtering Reply #13 - 09/12/11 at 14:52:29 So, tell us what you worked on right before the problem started.
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: High RPM sputtering Reply #14 - 09/12/11 at 15:12:02 AZSGT wrote on 09/12/11 at 14:48:18: I put it in fifth and rolled back down the driveway, and let the clutch out forcing engine to cycle. Is this indicative of decomp issue? As a rule, don't rotate the engine backwards, especially if you have a 4 speed. You'll bust out your starter.
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