evo carburetor problems

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Dec 14, 2007 | 05:18 PM

exportla

Thread Starter

1st Gear

Joined: Dec 2007

Posts: 5

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evo carburetor problems

I sent my 1999 evo FXSTC to be re jetting becuase I changed pipes and air filter. After the rejectting the technician doesn't know why my motorcycle is not working properly in high. It lost a lot of power as well cough a lot in high revolution.

Please advise

Joe

Dec 14, 2007 | 06:43 PM

Sandhog

Road Warrior

Joined: Apr 2006

Posts: 1,456

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RE: evo carburetor problems

you most likely went to far with the re-jetting.I would suspect the main or high speed jet is at least 1 size too big.If not more.I cant believe the tech wouldnt know this unless its a labor charge and hes in a jam to begin with.If you can foot it,go get a mikuni or Screaming Eagle carb with the Hi Po manifold.Its a 1 hour job complete and most times,an adjustment is all thats needed.
Im sorry I cant remember the right jet size but Imgettin old I RECKON

Dec 14, 2007 | 09:18 PM

lionsm13

Seasoned HDF Member

Joined: Oct 2007

Posts: 56,052

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From: Western South Dakota

RE: evo carburetor problems

Quote:

ORIGINAL: exportla

I sent my 1999 evo FXSTC to be re jetting becuase I changed pipes and air filter. After the rejectting the technician doesn't know why my motorcycle is not working properly in high. It lost a lot of power as well cough a lot in high revolution.

Please advise

Joe

I think that you're just too high, and probably need rejected..

Dec 16, 2007 | 12:03 PM

89 FXRS

Cruiser

Joined: Dec 2007

Posts: 213

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RE: evo carburetor problems

Go to another mechanic. One of the test should be a high speed shut down to look at the plugs.

Do about 50 for a mile, then pull in the clutch shut down the motor. Pull over and look at the plugs. Black is bad. Anway you know what the plugs should look like.

Dec 17, 2007 | 09:23 AM

!!!SPEEDY!!!

Advanced

Joined: Dec 2007

Posts: 76

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From: TX

RE: evo carburetor problems

GO to nightrider.com good info on how to modify your cv carb and jet it properly.

Dec 17, 2007 | 09:36 AM

EVOrider

Stellar HDF Member

Joined: Feb 2007

Posts: 2,558

Likes: 280

From: Russellville, Arkansas

RE: evo carburetor problems

I agree with everyone else....the rejetting was too much for your application.

I personally have never had much luck with the CV carburetor. I've rejetted and rejetted....was never completely satisfied. I finally dumped the CV for an S&S Super E.....no more problems and no more rejetting.

A CV carburetor can be made to work very well.....it just takes more time and paitence than I had.

Dec 17, 2007 | 12:45 PM

dog155

Extreme HDF Member

Joined: Nov 2006

Posts: 13,389

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From: Windham,Maine

RE: evo carburetor problems

It sounds too rich.Pull the plugs to verify.

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Dec 18, 2007 | 05:08 PM

SLC Rider

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Joined: Jul 2007

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From:

RE: evo carburetor problems

Quote:

ORIGINAL: exportla

I guess I wi go with the 42-18 mikuni assuming that the screaming eagle filter will fit.

Thanks

joe

The CV Carb is one of the easier ones to tune in my opinion, just takes a little bit of patience. I went through this earlier in the year with mine. For starters make sure the carb is stock and doesn't have a jet kit in it. Mine had a dynojet kit in it which I personally think are junk so I ended up getting a stock CV Carb. I run slip ons, k&n filter, and cam. I ran a45 slow jet, an 88 sportster needle, and 170 main and it runs great, but I have tried just about every combination of jets possible unitl I got to this point.

I personally would stick with the CV, you will lose gas mileage with the other carbs, I don't know if that matters to you, but once I went with a properly tuned stock CV carb I went from 26 mpg around town to 38 mpg around town, so it was significant.