try a 152.5 main jet.
i've had the raptor petcock in for about 3 thousand miles and my only problem is remembering to turn it to the off position when i put her to bed.
go ahead everyone. i know i've asked for it there.

franch wrote on 11/10/08 at 15:36:34:


What about the pilot jet? I think the one I got is stock...

52.5?? cause 50 is stock correct??

savagespence wrote on 11/10/08 at 18:46:39:


Every Savage/S40 carb I have taken apart had a 52.5 in it for the pilot. I think except for Cali models, 52.5 is stock.

The most recent one that I got into was a Cal model and it had the #52.5 pilot and it looked to be the original...lots of crud packed in there.

It seems from many posts here and a lot of questions &/or feedback received from folks who are rejetting/tuning their carbs that the best choice for the pilot jet is a "straddling the fence" kind of thing.  Some find the stock #52.5 works best and others the #55.  (main jet of #150 or 152.5)   Many folks are having difficulty deciding on which one because the #55 may be near too rich and the best setting found is down to something like just 1/2 turn out.  Yet when the stock jet is used it seems too lean and the best setting found may be near 3 turns out (3 turns is max).  
This seems to be happening on STOCK engines with the Dyna/Sporty muffler.   The low throttle range of the carb, controled be the pilot jet, is sensitive to changes to the intake and exhaust.  The choice of stock filter or small cone, and the choice of muffler used to replace the stock unit, all affect the fuel needs of the engine in that low range.
It is important to have a good handle on the tuning procedures so that the best fuel/air mix can be set to make the engine happy.  And if the engine does not respond to your tuning efforts then the carb likely needs attention.  For a non responsive carb, 9 times out of 10 it is caused by some kind of blockage within the carb; either a clogged jet or passage to/from the jet.   I have had hundreds of carbs go through my hands and clogged jets/passages are by far the single biggest cause of malfunction.  Think about it, the holes in the jets and passages are extremely small and it does not take much to block them...even a single grain of sand/dirt is all it takes for some.  GOOD FILTRATION IS IMPORTANT.

I got off the track there a bit.   So, back to pilot tuning.....bottom line is that you need an open mind when tuning and listen to the engine; it will tell you what it wants and needs.

HAVE FUN.

I left the stock 52.5 pilot and put in a 150 last year and was really happy with it.  But wanted to try out the 152.5, so last month I did.  And it's rich, added 3 disks to the trapp, still rich.  Added a K&N filter, still rich.  I'll add some more disks or go back to the 150.

But what I've noticed is a change in the startup procedure.  With the 150, I always needed a little twist to start.  But with the 152.5, can't touch it.  Choke the same on both, 1 notch out.

before i went up to the 150, going uphill in whatever gear I was in, backing off WOT felt like twisting it the other way, equal amount.  Of course I'm taking into concideration that the bike is maxed out already.  So no real accel, maybe slight.