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Old 08-10-2012, 06:18 PM   #706
ROAM_650GS
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Engine Speed Seems to be Limiting Out at 5,000 RPM

This is my problem;
My bike seems to be limiting the engine speed as it approaches 5,000 RPM.
- I recently removed my carb and cleaned the Pilot Jet because the engine would not start. After doing that the bike started great with almost no need for using the choke when starting. I rode it a couple of times and it seemed fine, but the other day when I needed to go up a steep hill and gain some speed it basically refused to rev above 5,0000 RPM even with the throttle pinned.
- One other point, when I put everything back together after cleaning the Pilot Jet, I accidently had one of the Carb tubes too close to the exhaust and it melted. It is the tube on the right side of the carb, on the parts diagram it is indicated as #92190 (Tube 5X8X430). As a quick fix I used a piece of smaller diameter tubing I had lying around. It is about a 1/16 of an inch smaller then the OEM part.

COULD THE SMALLER DIAMETER TUBING BE THE SOURCE OF MY PROBLEM? I WAS GOING TO REPLACE THIS WITH AN OEM TUBING BUT BEFORE I DO I THOUGHT I WOULD ASK....

Thanks,

Allen
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Old 08-29-2012, 08:59 PM   #707
the kawasaki kid
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Tires

What are people running for tires these days? Anyone running AC10s?
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Old 08-30-2012, 04:35 AM   #708
SugarDust
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Quote:
Originally Posted by the kawasaki kid View Post
What are people running for tires these days? Anyone running AC10s?

Yes! Very good off road, but wear fast on road. I liked them better than the 606s off road. They are good if you are mostly ride off pavement/trails.
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Old 08-30-2012, 03:37 PM   #709
250senuf
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Quote:
Originally Posted by the kawasaki kid View Post
What are people running for tires these days? Anyone running AC10s?
AC10 on the back, Pirelli MT21 front. Don't have too many km on this combo yet, it's been great so far.
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Old 08-31-2012, 10:46 AM   #710
markb1b
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Did you paint the plastic?
Quote:
Originally Posted by AeroEngineer View Post
New knobbies and paint on a KLX250SF:



Nice looking bike.

markb1b screwed with this post 08-31-2012 at 10:47 AM Reason: ??
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Old 08-31-2012, 12:48 PM   #711
BeenThere
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tires on your SF

What are the brand, size, and source for the knobbies on your SF?

Thanks,
Norm
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Old 09-06-2012, 01:52 PM   #712
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Did you paint the plastic?
Nice looking bike.
Thanks! Yes, its a rattle can job with Krylon Fusion yellow and a few coats of clear coat. It seems to be holding up decently, and it ever looks ratty its only a few hours work to hit it again.
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Old 09-06-2012, 01:56 PM   #713
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Quote:
Originally Posted by BeenThere View Post
What are the brand, size, and source for the knobbies on your SF?

Thanks,
Norm
I know I already sent this to you via PM, but for the history's sake the tires are Shinko 244s (3.0x17 front, 5.1x17 rear).

I'm going to replace the back tire with a 4.6x17 size to lower the rake angle. The diameter of the 5.1 is just too large (though it does lower the highway RPMs quite a bit).

The 4.6 tire looks like this:

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Old 09-06-2012, 04:56 PM   #714
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QUESTION...... so how does a KLX250, normally aspirated, run at elevations say of 9,000 ft. ?

Thinking of a Colorado ride....
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Old 09-06-2012, 05:23 PM   #715
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Quote:
Originally Posted by RicH2 View Post
QUESTION...... so how does a KLX250, normally aspirated, run at elevations say of 9,000 ft. ?

Thinking of a Colorado ride....
My '06 now has a factory 300 cylinder on it plus a full Muzzy exhaust and all airbox mods. My first two trips to CO went without drama or issue. Even at Imogene Pass at over 13,000' the bike ran quite well with the jetting suitable for my 1700' elevation at home. The CV carb does a decent job of some compensation of altitude.

This year, however, during my 2-week trip last month, it wasn't so smooth, and here's why. I was running 14/47 gearing with a Kenda 100/100/18 Trakmaster. This gearing and tire size must have been just about perfect for the bike, and it worked great in Colorado, Utah, and other western states and at high elevation. This year I was running a taller tire with the same gearing. That little change made a bigger effect than I anticipated. If I'd had a 13 tooth countershaft sprocket, I would have installed it.

All I'm saying with my situation as an example is that make absolutely, positively that you have low enough gearing for Colorado, especially at the higher elevations. You'll naturally lose some power on any bike up there, but the gearing will help overcome that deficit. I've been going to CO for many years, but this little tire and gearing deal snuck up on me on this trip. It wouldn't have been noticeable around Moab and such, but sucking all the air out of an engine on the really high rides made me work a little more in the tough sections.
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Old 09-06-2012, 06:48 PM   #716
RicH2
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Quote:
Originally Posted by TNC View Post
My '06 now has a factory 300 cylinder on it plus a full Muzzy exhaust and all airbox mods. My first two trips to CO went without drama or issue. Even at Imogene Pass at over 13,000' the bike ran quite well with the jetting suitable for my 1700' elevation at home. The CV carb does a decent job of some compensation of altitude.

This year, however, during my 2-week trip last month, it wasn't so smooth, and here's why. I was running 14/47 gearing with a Kenda 100/100/18 Trakmaster. This gearing and tire size must have been just about perfect for the bike, and it worked great in Colorado, Utah, and other western states and at high elevation. This year I was running a taller tire with the same gearing. That little change made a bigger effect than I anticipated. If I'd had a 13 tooth countershaft sprocket, I would have installed it.

All I'm saying with my situation as an example is that make absolutely, positively that you have low enough gearing for Colorado, especially at the higher elevations. You'll naturally lose some power on any bike up there, but the gearing will help overcome that deficit. I've been going to CO for many years, but this little tire and gearing deal snuck up on me on this trip. It wouldn't have been noticeable around Moab and such, but sucking all the air out of an engine on the really high rides made me work a little more in the tough sections.
Thanks. That makes since. I have the 351 kit, FMF exhaust, and air box mods. The bike really pulls great. Sounds like I should take a smaller front sproket along with me.

Thanks again....
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Old 09-11-2012, 07:39 AM   #717
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At really high elevations like that, another band-aid fix is to remove the airbox lid, assuming you haven't already. But the sprocket is probably the best overall change you could make.

Rob
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Old 09-11-2012, 11:10 AM   #718
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Quote:
Originally Posted by the kawasaki kid View Post
What are people running for tires these days? Anyone running AC10s?
Love the AC10 rear, but the AC10 front can be sketchy on harder terrain... Will be switching that out eventually, but not until it wears out... I'm on my 1st AC10 front. 3rd AC10 rear though, and I love how it hooks up in everything I've ridden through - mud, dirt, rocks, sand, etc. And, it fits.

Running Kenda Tuff Tubes w/ Slime because we hit the Big Bend, TX area once a year, among other places that provide a myriad of things to flatten tires... AC10's are damn tough.
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Old 09-11-2012, 05:21 PM   #719
250senuf
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Talking

How far down do you run the AC10 before you replace it? What do you approximate your street/dirt ratio to be? Thanks
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Old 09-11-2012, 07:57 PM   #720
surly357
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Quote:
Originally Posted by RicH2 View Post
QUESTION...... so how does a KLX250, normally aspirated, run at elevations say of 9,000 ft. ?

Thinking of a Colorado ride....

Box stock performance-wise, just 606s, handguards, a fender bob, and tools...



Pawnee Grassland. 5,000'




Switzerland Trail near Gold Hill. 8,300'




Above Carnero Pass. 10,100'




Deadman Fire Lookout. 10,700'




Rollins Pass, at the road closure. 11,300'






Now you can concentrate on the important stuff, like where to eat....
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