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Author Topic: Jetting Sounds - Blubbering to Cleaning Out  (Read 385 times)

Offline Nopick

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Jetting Sounds - Blubbering to Cleaning Out
« on: November 11, 2012, 11:02:29 am »
Ignore this post if you have been jetting Quad Racers for the last 20 years!  :)

I thought I would put together a few jetting runs from the last trip.  This was just a little work on the wide open throttle tuning.  I thought it might help some people understand what fat, rich, blubbering, etc. sounds like.  As well as what "cleaning out" sounds like.  So, the first run is very "fat" and it gradually leans out to a "clean" run.

This was on a Lectron so I was just making adjustments to the power jet.  The same series of changes would be accomplished on a "normal" carb by stepping down through main jet sizes until it cleans out.

Hope it helps...

http://youtu.be/ud_3_MvMt5s

Offline Dezsled

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Re: Jetting Sounds - Blubbering to Cleaning Out
« Reply #1 on: November 11, 2012, 11:18:20 am »
Jetting my keihin is a pain, but at least it can be done without removing the carb...

87 HPR LT500
04 Roll LOBO II TRX250R
06 LTR450
87 LT500
85 & 86 LT250
86 & 87 TRX250R
07 & 09 Husqvarna TE450
00 CR125R

Offline Rogue1970

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Re: Jetting Sounds - Blubbering to Cleaning Out
« Reply #2 on: November 11, 2012, 05:47:28 pm »
Good post Nopick!  I also have some footage of my quad running rich on the main.

http://www.youtube.com/watch?v=ufd3f5ytibE

Before I'm at Olds and we are riding slow, you can hear my full throttle spit and sputter before it can clean out.

The Mikuni TM38 you can change the main jet out the bottom of the carb.  Just pickup the tools from RMATV or such and you don't even have to turn the carb to get to the jet.  The needle is a bit harder and you have to remove the carb or just turn it in the mounts to remove the slide and change your clip position.  If your Pilot jet has to change, you have to remove the bowl and main jets to get to the pilot jet.   Nothing too hard, but you need tools for all of them.

Offline Nopick

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Re: Jetting Sounds - Blubbering to Cleaning Out
« Reply #3 on: November 11, 2012, 07:44:44 pm »
Nice one, Rogue!  I am looking forward to riding there this winter.

Offline Dirtzilla

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Re: Jetting Sounds - Blubbering to Cleaning Out
« Reply #4 on: November 11, 2012, 09:23:41 pm »
nice vid,  (Y)
87  LT500R
98  sporstman500

 

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