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General Category >> Rubber Side Down! >> New Guy Here....and some questions!
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Message started by rkutzner on 10/18/04 at 17:12:34

Title: New Guy Here....and some questions!
Post by rkutzner on 10/18/04 at 17:12:34

Hey, guys,

Just drove my S40 home today and as a new bike rider I love the weight and the power. My drive to work is all twisty backroads and it seemed like the 'cruiser' to get.

Can someone give me a 4-5 sentence explanation of the backfire issue, I noticed it a few times in lean/idle conditions (like engine braking slowly before a curve and twice when turning it off). I suspect they are lean from the factory, but it seems a bit much? It was cool today, ~60.

I am not new to these types of engines and have put a piston/intake cam/exhaust on my Z400 and jetted it with little problem. The S40 looks simpler and it was cheaper :D so I plan on doing everything myself as soon as I get my FSM.

And anything else anyone would like to share would be appreciated, maybe soon I will be productive on this site as well!!!

Title: Re: New Guy Here....and some questions!
Post by savagethumper on 10/18/04 at 20:37:08

Welcome to the club, Rkutzner. I think everyone that has a Savage/S40 has had the backfire issue. Mine still does it after 10,000 miles. I think Greg_650 said they are lean from the factory, and that a washer in the carb can be changed out to fix the problem. Look around the forum for "carb spacer" posts. 8)

Title: Re: New Guy Here....and some questions!
Post by Gargoyle on 10/19/04 at 09:11:18

Removing the white plastic spacer will help. Also a larger main jet will help as well. It will take a little time to get things right. Search for white spacer and main jets. We are here to help. The jetting depends on variables. Will you be replacing the muffler? Will you be replacing the air filter? Stick with it you will get it set up right for you and the effort is worth it.

Title: Re: New Guy Here....and some questions!
Post by Paladin on 10/19/04 at 10:53:45

8) I like the backfiring. Gives the Savage Attitude. 8)

Title: Re: New Guy Here....and some questions!
Post by rkutzner on 10/19/04 at 12:06:37

Thanks guys. What I've seen is folks saying the white spacer which is from the needle which would have a 1/4 to 3/4 throttle effect or the mixture screw/main jet which would have a idle and over 3/4 throttle effect. I might play and do both to cover the entire rpm range.

Any exhaust kits that include jetting for exhaust and stock everything else? Is there a K&N for the bike?

Title: Re: New Guy Here....and some questions!
Post by Greg_650 on 10/20/04 at 02:43:05

The idle mixture screw affects the closed throttle mixture (idle), the spacer works up to the 1/2 throttle position and the main jet works above that to full throttle.

You might want to read the topic, "Backfiring, please help..."