Just have a quick question on the carb modification. Is there a kit to do the mod? I just purchased a 95 savage a month ago and would like to do the carb mod but don't know were to get the parts to do it. Please help! My savage backfires every time I shut it off and when I cruise around 55-60 mph.

Dyno jet kits are a waste of money.  The stuff should be easy to find.

Spacer mod:  Go to ACE hardware or whatever and buy the a couple of number 4 or 3 washers (buy both so you don't have to go back when you buy the wrong size... only one will fit).

Jets:  Go to pretty much any motorcycle dealership, HD, yamaha, suzuki, whatever, or repair shop.  Any of these places should have the jets you need in stock for $2 or $3 each.  It may help to bring in the jets to make sure you get the right one.

You should also clean out the carb while you are doing all this, so buy some carb cleaner while you're out there.  

Also,  dynojet jets are not really the same size as the mikunis... i.e. a 150 mikuni main is not the same as a 150 DJ main....

Yeah, the adjustable needle is nice but changing the thickness of the spacer accomplishes the same thing.  You'll still want a bigger main jet, especially if you upgrade your exhaust.  The main jets are around $3 - $4 each and are at a lot of places both in meatspace (your local HD dealer, as mentioned above) and cyberspace (Motorcycle-Superstore, among others).  Do a few searches.  This is an oft-repeated topic.  Also look at the Best Sources for Savage Parts topic in the Marketplace.  The note above on replacing the screws is a good one and is also oft-repeated.  Replace them with allen screws and your future access will be easier.  Stainless is best and I've found them easily at Ace Hardware.  Just take one of each of your old ones in to match the size... or there's a post by someone (Reelthing maybe?) in the past few weeks on this topic which specifies the size.

If you slow the bike to a stop.....and then hit the kill switch while Slowly releasing the clutch it will not back fire....it takes practice...but is easy to learn.