SuzukiSavage.com - Firing Order

genejohnson

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Firing Order
07/03/09 at 07:52:25

I have a question that I hope someone can answer without assuming the answer. Since a pulse on a Savage is picked up every 360 degrees, does the plug fire every 360 or 720 degrees? On most 4 cyl bikes, 2 cyls fire at top of their stroke while the other 2 cyls fire at bottom of their strokes. I wonder if the Savage fires at the top of its stroke and at the bottom?
If not!, the Ignition Module would have to ignore every other pulse and for some reason that doesn't sound likely. Does anyone have any insight to the way the Savage works? Gene

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T Mack 1 - FSO

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Re: Firing Order
Reply #1 - 07/03/09 at 08:05:21

Actually noting fires at the bottom of the stroke. It's on the waste or exhaust stroke.

That said, the S40/LS650 is a simple design and fires every time the piston comes up to the top of the cyclinder. )One on the compression stroke then again on the exhaust stroke.

This sort of make putting the engine back together easy. You just have to line up all the top-dead-center (TDC) marks on all the misc parts and it will work.

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Firing Order Reply #2 - 07/03/09 at 08:07:23 It fires at the top of each stroke, compression & exhaust, a wasted spark system
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 28884 L.A. California Gender:	Re: Firing Order Reply #3 - 07/03/09 at 08:07:48 What's the firing order on a single cylinder engine? 1,1,1,1,1,1... It fires every 360°, a few degrees BTDC
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Charon

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Re: Firing Order
Reply #4 - 07/03/09 at 08:30:18

Just like almost every other engine with a flywheel mounted pickup coil. The spark fires every time the magnet on the flywheel passes the pickup. Almost universal on lawn mowers and other equipment using Briggs, Tecumseh, Kohler engines.

My wife's Honda Twinstar used the same system, except that the coil had two wires. One wire went to each plug, and both plugs fired every revolution. It is said that the "wasted" spark may possibly help burn some of the unburned gases in the exhaust, but I have my doubts.

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Eschew obfuscation.

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Serowbot YaBB Moderator ModSquad Offline OK.... so what's the speed of dark? Posts: 28637 Tucson Az Gender:	Re: Firing Order Reply #5 - 07/03/09 at 08:33:31 verslagen1 wrote on 07/03/09 at 08:07:48: What's the firing order on a single cylinder engine? 1,1,1,1,1,1... It fires every 360°, a few degrees BTDC ..now,..now,..now,..now..
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genejohnson

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Re: Firing Order
Reply #6 - 07/03/09 at 09:33:54

When I used firing order as the subject matter it was to create interest in the post so that I could get some responses. I figured it was as everyone has suggested but wanted to know that there wasn't something I was missing as far as the Savage was concerned. I guess that means using the Duraspark Module should work on my test stand engine. Thanks for all the input. Gene

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genejohnson Full Member Offline SuzukiSavage.com Rocks! Posts: 100	Re: Firing Order Reply #7 - 07/03/09 at 09:36:17 Thanks T Mack 1 for correcting me. It is the Exhaust stroke and not the bottom of the stroke. Gene
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Ed L.

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Re: Firing Order
Reply #8 - 07/03/09 at 12:46:00

The sensor is triggered by a dimple in the flywheel. There are two dimples set 180 degrees apart so you get a second or wasted spark every rotation of the crank. I've always wondered if the wasted spark during the exhaust stroke helps to produce the loud pop we all get when backing off. I've been out in the heat too long cause I just realized that you could make the savage a two stroke with that extra spark. Shocked

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Rockin_John

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Re: Firing Order
Reply #9 - 07/03/09 at 18:00:59

Ed L. wrote on 07/03/09 at 12:46:00:

The sensor is triggered by a dimple in the flywheel. There are two dimples set 180 degrees apart so you get a second or wasted spark every rotation of the crank. I've always wondered if the wasted spark during the exhaust stroke helps to produce the loud pop we all get when backing off. I've been out in the heat too long cause I just realized that you could make the savage a two stroke with that extra spark. Shocked

Nope Ed, there is only one spark per 360º... and as other's have said, it is in response to a magnetic "strip" in the flywheel.

In fact, it is possible to demagnetize the strip in the flywheel by mishandling it (dropping it, or hitting it with a hammer). An expensive mistake best not made.

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Savage Eddie Full Member Offline Custom Bob's ROCK! Posts: 204 40 miles west of Chicago Gender:	Re: Firing Order Reply #10 - 07/03/09 at 23:53:58 verslagen1 wrote on 07/03/09 at 08:07:48: What's the firing order on a single cylinder engine? 1,1,1,1,1,1... LOL! as i read this question i waited for someone to post that!
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mpescatori Serious Thumper Offline Romanum Thumperium Cavalco, yeaaah !!! Posts: 3547 Rome, Italy Gender:	Re: Firing Order Reply #11 - 07/04/09 at 06:25:22 verslagen1 wrote on 07/03/09 at 08:07:48: What's the firing order on a single cylinder engine? 1,1,1,1,1,1... It fires every 360°, a few degrees BTDC As in, "how many legs does a Pogo Stick have" ?
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Ed L. Serious Thumper Alliance Member Offline "We All go a Little Crazy Sometimes" Norman Bates Posts: 2808 Sunny Florida Gender:	Re: Firing Order Reply #12 - 07/04/09 at 06:44:51 I stand corrected, thanks
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