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General Category >> Rubber Side Down! >> No Power at open throttle
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Message started by RangerBob on 06/08/07 at 17:39:58

Title: No Power at open throttle
Post by RangerBob on 06/08/07 at 17:39:58

I've had my '98 Savage since September. It's got about 9500mi and about 1000 of those are mine.

It's run great since I've had it.

Today it started to lose power on the top end.

Starts fine, idles fine, accellerates OK but only at part throttle. If I open the throttle up it still runs OK, but actually looses a little power.

In 4th and 5th gear, this phenomonon keeps me from exceeding 50 or 52 mph.

I can tell that the fuel is feeding better at partial throttle. If I open the throttle a little further I can feel the power drop slightly. If I back off a fraction I can tell the power picks up very slightly until the bike accelerates a mph or two and then it hits the wall again.

Any ideas what could be causing this?

Still, this condition is

Title: Re: No Power at open throttle
Post by verslagen1 on 06/08/07 at 19:26:35

Try it in prime. If it goes away replace your vacuum line.

Title: Re: No Power at open throttle
Post by RangerBob on 06/08/07 at 19:34:16

I tried that. No change.

There is a little rust in the tank. Do you think I've clogged the carb?

If so, what would the fix be?

Title: Re: No Power at open throttle
Post by verslagen1 on 06/08/07 at 19:44:39

if you got crap in the carb, take it off and clean it out. A can of carb cleaner, don't get it on the rubber bits.

If there is crap in the carb, clean out your tank, and your little petc0ck too! ha ha ha ha ;D

Title: Re: No Power at open throttle
Post by Fido_the_Cat on 06/08/07 at 20:14:09

Perhaps you may have to go beyond the fuel tank and pull the carb to get whatever is blocking the high side of your throttle. Since you can ride fine at 35 mph but goes flat at 50. This is my opinion, I agree if you have gunk in the tank get it out; but I think the gunk has traveled farther. My suggestion is follow the advise of someone who does know a carb better than I do. Just my .02.

Title: Re: No Power at open throttle
Post by klx650sm2002 on 06/09/07 at 02:35:45

Just a thought but could your slide be sticking ?

Clive W :D

Title: Re: No Power at open throttle
Post by barry68v10 on 06/10/07 at 02:17:48

One of the problems I had with my bike is the internal fuel screen (inside the tank) was PARTIALLY clogged, it had gunk and varnish all over it. I have a 1997 that had 600 miles on it when I bought it. I just removed the fuel screen and installed an inline filter, along with the petc0ck mod, those two things solved all my fuel feed problems.

At any rate, you may be getting restricted fuel flow because of a clogged fuel screen. If that's the case, you'd go WAY lean when you open the throttle to WOT, but could be getting enough fuel at part throttle. If you verify the screen (or anything else) is not restricting your fuel flow. You likely have some sort of carb problem. I'd suspect a clogged main jet from the symptoms then, but you'd have to start tearing into the carb to verify/fix.

Title: Re: No Power at open throttle
Post by RangerBob on 06/11/07 at 03:04:56

klx650sm2002,

You were right. The slide was sticking.

It appears that I let oil build up in the airbox, which saturated the air filter, pulling oil into the carb.

The oil gummed up the slide and caused it to stick.

I had to lever it up to remove it for cleaning.

Thanks for the help.

Title: Re: No Power at open throttle
Post by Stimpy on 06/11/07 at 09:36:05

Same problem last month.

Not only clean it but polish it! Use silver polish paste on both slide and carb walls; cut marker & rotate slide 1/4 if too worn. Works like a charm!

good luck