batman wrote on 08/11/18 at 08:18:56:You said you did the spacer mod but you didn't say what you did . Did you sand the white spacer or replace it with washers? How many washers or how much of the spacer did you remove?
The stock petcock is failing or will fail ,that's why we recommend changing to the Raptor.
If your thinking of changing to a Dyna or other suitable muffler ,you should do that before tuning the carb or you'll be tuning it again.
Part of your problem of running rich may be your stock air cleaner ,it has many pleats and is restrictive,(less air tends to make the motor pull more fuel from the carb) A K&N drop in or Oldfeller''s filter (it's in the Tec Section) may be a good bet, more so if you change mufflers.
All jets add to the total amount of fuel . Even at wide open throttle (WOT) your still getting fuel from the pilot jet
If you want to stop the afterfire at shutdown ,place the bike in neutral, allow it to drop to idle speed and reach down and pull the choke out fully a second before hitting the kill switch.
I sanded the white spacer in half or just a hair above half to be exact. The bike has backfired in 4th gear a time or two when I go from 3/4 throttle to rolling all the way off the throttle but they haven't been loud enough to be alarming to me and still a mild foooph at shut down.
I'll look into the raptor petcock.
When you speak of the K&N air filter are to talking about switching to a cone air filter or does K&N have a air filter that mounts in the suzuki savage air box?
I'll also try pulling the choke out before shutting down the bike to see what I get.
I've purchased a dyna muffler and hope to get it on the bike in the next week or so. Upon doing that, do you foresee me needing to rejet? right now I'm at a 52.5 pilot jet and a 145 main jet and air/fuel mix screw turned out to 1.75 turns with the white spacer sanded down to half the original thickness and the bike is running great.