Jetting Kit. - TwoWheelForum: Motorcycle and Sportbike forums
 
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post #1 of 14 (permalink) Old 06-20-2006, 01:48 PM Thread Starter
 
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Jetting Kit.

Hey guys and gals,

I have a question about carbs. I posted a question before about the fact that I have a two brothers racing pipe on my bike and I am considering putting a K&N air filter in it. I originally asked the question, “Should I have the carbs jetted after this upgrade”.

Everybody seemed to think so because of that and the fact that the bike has 21,000 miles. A dealership told me that parts and labor would be about $200 to jet my carbs.

My question is, I don’t know if my bike has been jetted before I bought it. If it was jetted, is it pointless to do it again? Basically what is jetting and is it possible to do it more than once?

Thanks guys and gals,
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post #2 of 14 (permalink) Old 06-20-2006, 10:26 PM Thread Starter
 
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Anybody got any thoughts.................I am not really sure what I should do.
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post #3 of 14 (permalink) Old 06-21-2006, 01:14 AM
 
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Jetting adjusts your fuel flow and mixture with air. It consists of changing the size of the main jets (hole size) and needle size in the carburetors. there are 3 parts to jetting. adjustments for idle, mid range, and top end. Dyno tuning is the best way to adjust it. Increasing air flow by using either aftermarket air filters or full exhaust systems (or both) requires re-jetting.

the reason no one is responding is because google is available.

-a|ex
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post #4 of 14 (permalink) Old 06-21-2006, 01:42 AM
 
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Quote:
Originally Posted by Back _Marker
the reason no one is responding is because google is available.

-a|ex
Of course Google is available, its available for every question if you look hard enough, but its a lot easier to post a message on here to get your question out to a group of people who know bikes and whos opinions you value, and for the most part don't mind answering questions even though they may seem obvious to them, and the answers could be found elsewhere.
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post #5 of 14 (permalink) Old 06-21-2006, 01:52 AM
 
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it's not that hard to google search motorcycle jetting
i clicked on the first hit http://www.motorcyclecruiser.com/tec...s_carburetion/
and it has much more information than what i can type in a few minutes.

it's always a good idea to research first before asking in forums.

-a|ex
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post #6 of 14 (permalink) Old 06-21-2006, 07:45 AM
 
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Don't be so hard on this guy...he's just looking for some help.



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post #7 of 14 (permalink) Old 06-21-2006, 09:36 AM Thread Starter
 
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WOW Back Marker.......next time I post something if you don't want to repond.......PLEASE DONT. I would rather not hear your opinon if that is the way you want to be.

Plus, I did research google and it will not tell me if I need to rejet after putting in an aftermarket air filter.

Thanks for nothing.
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post #8 of 14 (permalink) Old 06-21-2006, 09:40 AM
 
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I dont know about re-jetting. But it wouldn't hurt to atleast have the carbs cleaned and tuned. Thats probly about right on the price for that. Not a cheap job.



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post #9 of 14 (permalink) Old 06-21-2006, 10:41 AM Thread Starter
 
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So, with the tuning are there any parts involved or is it only labor.

A dealership near me told me they could jet my carbs for around $200. ($125 for the kit and $75 for labor).

Do you guys and gals think this is a good deal or should I just leave them alone and look into getting them cleaned and tuned.

Keep in mind I do have a two brothers racing pipe and will be putting in a K&N air filter soon.

Also, is there anyway to tell if my carbs have been jetted before and if so is it worth jetting them again.

Thanks for all the help.

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post #10 of 14 (permalink) Old 06-21-2006, 10:43 AM
 
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Cleaning and tuning would be labor. Alot involved to tear them down and put back together. I'm no carb expert so I cant really help you with the jetting thing.



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post #11 of 14 (permalink) Old 06-21-2006, 11:44 AM
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How does the bike run now? Does it start and idle smooth? Does it accelerate clean? Does not stumble? Has good top end? Usually when switching to an aftermarket exhaust, and not re-jetting, rideabilty issuse would surface.

Put in the K&N first and see if you have any of the issues I mentioned. If so, then you need to rejet. If you do not have the tools & skills required to replace the jets yourself then $75 labor is a good deal. Especially if it is done right. You shop may just throw a kit in and not test it. You may not get any better results that way.

The stage-I kit for my bike comes with 4 sets of main jets. Not to mention the needles have 5 or 6 adjustments to them. It takes close to 2 hours to swap out the jets.

Your results may vary!
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post #12 of 14 (permalink) Old 06-21-2006, 09:30 PM
 
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put new spark plugs and run it up to redline. look at the plugs for color and wetness/dryness.

my method that i use on the race track involves tapping in an O2 sensor and the voltage should be .5 watts for ideal.

a dyno run will give you better results. find a shop that has one. most dealers will just look up the recommended specs for the jet kit and let it out the door.

-a|ex
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post #13 of 14 (permalink) Old 06-22-2006, 01:18 AM
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That price is a good deal! But I think the breakdown on the price is reversed!




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post #14 of 14 (permalink) Old 06-22-2006, 01:36 AM
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Most likely you will need a stage two kit with filter and slip-on or stage three for filter and full system. Rejecting for under 3 bills isn't bad.

The mechanic should be able to tell by the size of the jets. He/she will still have to take the carbs apart first to see. Jetting may not be necessary. They may be able to simple adjust the needles to compensate for the extra flow.

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