I am trying to cure the sluggishness/flat/poor throttle response condition on my wife's Savage.  It pulls strong as long as the RPM's are up, and idles fine.  I am also not chasing any popping on decel or shutdown.  Just looking to improve power and driveability.

I am familiar with re-jetting, and members here have told me how to deal with the white spacer, so my questions are;

Is there a formula that's generally accepted as a good starting point?  Say main jet X,  pilot Y spacer Z?

Has anyone ever dyno'd their bike with an exhaust gas analyzer and gotten good results?  Say a nice flat F/A ratio in the 12.3 range?  If so, would you be willing to share the specifics of your set up? (jettting, spacer etc.)

I ride an EFI Harley that you tune with a computer.  I might see if the custom shop down the street from me will give a 2fer deal on the dyno.  If I do, and end up with a good tune, I'll post the results and specifics here.

Thanks to you all.  This is a great forum.

look in the teck section for Lancers carb tuning thread. He is the best at carbs. I even got good at it from these guys take off battery cover and air connection,  twist , tilt and bing! its out.

sparkett wrote on 12/31/69 at 16:00:02:



Thanks for the suggestion.  I have read pretty much all I could find already.  Just looking for recommendations from people who have done it on where to start in terms of jet / spacer sizing.

Brewbrother wrote on 12/31/69 at 16:00:02:



Do you think I'd be running rich if I used your set up with the stock muffler?  I see you're running a Sporty muffler.

Thanks

It's pretty flat all the way through the low end and midrange. If you go through the gears easily it feels sluggish the whole way.  If you keep the revs up and delay shifts a bit it pulls pretty good.  Based on what you've told me I think it makes sense to start with the mixture screw and spacer and see what effect that has.  What are your thoughts on the pilot jet?  Best left alone?

Thanks for the advice.

Reelthing wrote on 12/31/69 at 16:00:02:

My thoughts exactly.

Sounds like a good place to start - you'll have to adjust on the mixture screw maybe 1/8 a turn or less at time after it gets warmed up until you find the sweet spot

if your going to do the work your self - read very careful about it - those are very soft screws - they should be replaced with s/s allen head - and the little ones at the bottom of the slide are #1 phillips - use a new/good tip
and have the slide clean when it goes back in - also inspect the diapharm for any pin holes or rips,etc....

A fuel/air ratio of 14.7:1 is the ideal stoiciometric ratio as Greg stated for pure gasoline air mixture.  However, max power is usually achieved between 13.1:1 and 14.1:1.  Ratios above 14.7, up to about 16:1 will decrease power but increase mpg, but watchout...the leaner the mixture, the hotter the burn, and 16:1 can burn valves and cylinder heads.  Again, richer is better, especially in an air cooled engine.  If I can get an exhaust/gas analyzer, I'll try to tune to 13.5:1.