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Thread: Baja SS Carb Tuning

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Old 02-16-2009, 04:13 AM   #1
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Default Baja SS Carb Tuning

After running my Baja ss for 30mins and inspecting the spark plug I find the plug wet with oil. How does one adjust the needles on the carburetor to get a healthy looking spark plug. Since I am a noobie a little detail explanation would be helpful. Thank you all in advance. :)
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Old 02-16-2009, 06:39 AM   #2
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If this is a new motor then keep this rich setting for at least one tanks worth to help to break it in. If you're useing a synthetic oil then keep the settings for a couple tanks to allow the piston ring to fully seat.

After break-in you can start tuning for performance. If you look at the carb from the pullstart side you will see 2 needle settings side by side with a bigger idle speed screw below them. The left neddle is the highspeed(HSN)and the right needle is the low speed(LSN).

Before tuning and needles, make sure that your throttle trim is zero out and that your servo fully opens and closes the throtle on teh carb.

Now, reset your needles to factory, its always good to do this even if you have never touched the needles before, don't assume they are set right out of the box. Stock setting HSN 1.5 LSN 1.25 these are turns out from fully closed(turned all the way in) ** if you have an aftermarket tuned pipe, go .25 to .5 richer on the HSN to start.

let your motor warm up for 5-10 minutes and tune the LSN for a nice slow and steady idle. Then do some high speed passes and at the end of the last high speed pass, shut it down right away. Remove the spark plug, it should have a brown paper bag color to it. White or gray are too lean and black like it is now is too rich. Personally I run just slightly on the rich side to be safe. A new plug will take some time before before you start seeing color and can be read better.

When first learning to tune, a good rule of thumb is if whenever you need to make needle adjustments always try risher before going leaner.

Last edited by SSNOS; 02-16-2009 at 06:56 AM.
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Old 02-16-2009, 07:16 AM   #3
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did you shack your fuel before putting it in the fuel tank. some people for get to do this before puoring.
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Old 02-16-2009, 07:21 AM   #4
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Here is a great set of guidelines written by Doug from ESP.
http://bajaplanet.com/baja-mechanic/...ctions-by-esp/
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Old 02-16-2009, 10:35 AM   #5
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Thank you SSNOS, great help will try the settings this weekend.

One another thing is that the acceleration does not continue for long say after 20m or so the revs cut off and after some jabs on throttle it picks up and drops after few seconds. Is this due to carb getting rich.
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Old 02-16-2009, 10:36 AM   #6
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Thank you Eddy, you are always a help in this forum.
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Old 02-17-2009, 07:42 AM   #7
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Quote:
Originally Posted by Tippy View Post
Thank you SSNOS, great help will try the settings this weekend.

One another thing is that the acceleration does not continue for long say after 20m or so the revs cut off and after some jabs on throttle it picks up and drops after few seconds. Is this due to carb getting rich.
Could be several things:

Too lean and the engine will overheat and heat soak, you will lose power as it gets hotter.

Too rich and the unburned fuel loads up the motor, until you clear it out with a good WOT run.

Also, make sure you are always running a clean and well oiled airfilter.

The link to ESPs tuning instructions that Ed posted is an excellent guidline.

Last edited by SSNOS; 02-17-2009 at 07:44 AM.
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