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General Category >> Rubber Side Down! >> Macs Pipe Installed, Tuning ?'s
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Message started by Circle_Burner on 04/14/06 at 18:26:38

Title: Macs Pipe Installed, Tuning ?'s
Post by Circle_Burner on 04/14/06 at 18:26:38

I installed a new Macs pipe, it looks and sounds excellent.

I turned out the low speed needle to 2 turns, rejetted the carb with a 152.5, and shaved the white spacer in half. I have the stock airbox with no mods.

The question is I'm still getting backfires, so what I should I do? Rejett to a 155?

Thanks for the help.

Title: Re: Macs Pipe Installed, Tuning ?'s
Post by 911radioman on 04/14/06 at 19:00:35

You may need to up the pilot jet by one size. Thinking about doing it to mine, haven't decided yet.

Title: Re: Macs Pipe Installed, Tuning ?'s
Post by bobtreat on 04/15/06 at 05:56:40

Carb tuning>>> It never ends MAIN JET for wide open...
PILOT JET for mid range. Most of the time the throttle isn't wide open and the fuel is not lean,however if the pilot jet is not large enough it will be in a lean state.For any pipe upgrade you must increase the pilot jet to cure the lean condition.the pilot jet and main jet must work together so increase pilot increase main.With the savage in stock form and a pipe upgrade the air box should be opened and the pilot jet increades to .75 this is with any pipe. the main is a trial be seat of pants and reading the plug.155 is where i found mine to run preform the best with a jardine pipe.

Title: Re: Macs Pipe Installed, Tuning ?'s
Post by Circle_Burner on 04/15/06 at 06:20:35

Can you drill the pilot jet to open it up?

Title: Re: Macs Pipe Installed, Tuning ?'s
Post by Savage_Rob on 04/15/06 at 06:58:47

Okay, first, use basic tuning procedures and don't just use "2 turns". Below is a quote from Lancer that I think covers it pretty well. You may also try reading applicable sections at DAN'S ONLINE
MOTORCYCLE REPAIR COURSE (http://www.dansmc.com/MC_repaircourse.htm) like Carburator Theory and Tuning. Second, don't drill jets. If you decide to try a larger pilot jet, spring for the $3 to $5 and get one that's the correct size.

Quote:

-start with the pilot adjusting screw at 1.5 turns out as a reference point, and count as you turn in and out so you always know where you are during the process. Everything is done and referenced in the "# of turns out".
-turn idle up a little so you have a smooth fast idle
-turn pilot adjusting screw "in" until engine begins to slow downand note the # of turns out
-turn pilot adjusting screw "out" until engine begins to slow (it will speed up initially then go down) and note the # of turns out
-then set the pilot adjusting screw in the "Happy middle" of those two positions
-after the pilot circuit is happy, turn the idle adjusting screw back down for the idle you desire.

*for ex...if the turn in setting was at 1 turn out, and the turn out settig was 3 turns out, then the happy middle is 2 turns out.
**Turn slowly as you do this, no more than 1/8 or 1/4 turn at a time...then pause and wait 5 seconds or so in order to give the engine time to adjust, then turn again if necessary. If you have a tach, then you can set the pilot adjusting screw by just tuning for max rpm, then set idle speed.
***If after you have finished this process, the pilot adjusting screw is 2.5 -3 turns out, then you definitely need the next larger pilot jet. For myself, if I go over 2 turns out then I go up to the next size pilot jet.

When the pilot is properly adjusted, and assuming there are no exhaust leaks in the system, you will not have any backfiring. It is normal to have some mild crackling and popping on brisk-hard deceleration, but there will not be any backfiring.

Title: Re: Macs Pipe Installed, Tuning ?'s
Post by lancer on 04/15/06 at 09:30:26

I couldn't have said it better myself.