Light Surging at a constant speed.
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Author Topic: Light Surging at a constant speed.  (Read 3564 times)
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solorider40
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« on: April 16, 2012, 12:54:14 PM »

Yesterday, I was coming home from an enduro and while riding at a constant 60mph the bike had a slight surging. I didn't notice anything while accelerating or decelerating only while at a constant speed. One point I pulled the choke on and the surging stopped, which leads me to believe it is fuel related. It was around 80 degrees when this was happening. Later that evening when it cooled down I took the bike for a ride and didn't notice the surging. Anyone have any suggestions  Hmmmmm...
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Sam
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« Reply #1 on: April 16, 2012, 01:06:56 PM »

i've had that happen to me on the rarest of occasions.  i just ignored it and it seems to go away.  maybe there is something wrong but if it is 'slight' i'd say you're fine.


BUT... if it wasnt bothering you, you wouldnt have posted. :)

I'd try these things:

have you checked your carb vent tube?  maybe it is partly clogged.  one time when mine absolutly would not run, the vent tube had gotten crimped.

drain the carb bowl into a clean cup (not styrofoam) and see if there's crud in your fuel.

when is the last time you checked your spark plug?

do you have any fuel/air related mods?  i.e. Hurrricane petcock mod, PCV valve, aftermarket air filter, any holes in your airbox or a spiffy new exhaust?

i'm just throwing out possibles.  PARTY!

sre
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JV
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« Reply #2 on: April 16, 2012, 01:25:21 PM »

Are all jets OEM? Any mods to the air box? 22 cent mod been done?

Whoops, some duplicate questions from Steve's post.
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« Reply #3 on: April 16, 2012, 04:05:33 PM »

Its likely got to do with the vacuum petcock.  My 08 used to do it also the Hurricane mod fixed it
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« Reply #4 on: April 16, 2012, 05:38:48 PM »

Mine was running like crap, turned out the fuel level was way too high. I found this out by checking the level with the clear tubing on the fuel drain connection.
A little float adjustment and it runs better than it has in years. From now on, any fuel related issue is going to get that treatment first thing.
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« Reply #5 on: April 16, 2012, 07:41:44 PM »

I had a slight surging and backfires while decelerating. I removed the plug on the air/fuel jet, richened it slightly, and everything is great now. No backfires or surging. clap
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solorider40
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« Reply #6 on: April 17, 2012, 04:35:29 AM »

Great Tips Guys! I'll give these a try.

I have done the $0.22 Mod and everything has been fine for 49K miles. I have been thinking of doing the Hurricane Mod. I did drain the float bowl and no crud came out.

I do have a slight back fireing at deceleration. I'll try and richen it up a little and see what that does, along with installing a new spark plug. Not sure when I did that last  thinking...
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Sam
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« Reply #7 on: April 17, 2012, 06:16:22 AM »

The next time that it happens pull over and open the fuel cap- you might need to do the fuel cap vent seals mod(in the Library).
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« Reply #8 on: April 17, 2012, 10:44:00 PM »

My brand new KLR has done something similar a couple of times:  I was riding on the interstate at about a constant 60 mph, and then when I would open the throttle slowly, it would delay for a bit, then surge.  No modifications to speak of--only thing I could think of was that the Happy Trails engine guard  I installed might be hindering the throttle cable, but it has free play.
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solorider40
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« Reply #9 on: April 18, 2012, 04:54:43 AM »

The next time that it happens pull over and open the fuel cap- you might need to do the fuel cap vent seals mod(in the Library).

1st let me say "Happy Birthday Hondo!"..... Thanks' for the tip I will definitely do this Mod. Looks pretty easy.
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Sam
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« Reply #10 on: April 27, 2012, 08:56:14 PM »

My 08 does it consistently in any gear at any speed when the RPM's are at 3k or lower.  I need to do the .22 mod along with the hurricane mod.
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« Reply #11 on: April 28, 2012, 07:37:45 AM »

Its likely got to do with the vacuum petcock.  My 08 used to do it also the Hurricane mod fixed it

Ditto on my this one.  My Son in laws 08 surged pretty much constantly.  I fixed it by replacing some of the rubber vacuum peices.
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solorider40
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« Reply #12 on: May 01, 2012, 05:06:53 AM »

The next time that it happens pull over and open the fuel cap- you might need to do the fuel cap vent seals mod(in the Library).

Hondo, This Mod fixed my problem!! clap Way to go! One of the rubber diaphrams was actually broke off from the stem. I guess it was'nt allowing any air to pass through at high speeds due to the vacum on it. Thanks' for the Tip!! thumb
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Sam
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« Reply #13 on: May 01, 2012, 05:52:56 AM »

 clap   Awesome
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oldstove
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« Reply #14 on: May 01, 2012, 07:36:16 AM »

 thumb
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« Reply #15 on: June 15, 2012, 07:49:35 AM »

I too was experiencing a bit of that surging at highway speeds. However I think it might have been caused by the choke control.
I was making an adjustment to the left mirror/clutch lever position yesterday and noticed that it had been preventing the choke control from returning full to the off position. Having corrected that, the bike seems to run more smoothly now. As a test I returned to the choke lever to the position it was stuck in before and the surging returned.

Something to check out.
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