SuzukiSavage.com - BACKFIRE- STILL!!!

arteacher

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BACKFIRE- STILL!!!
06/02/11 at 15:56:10

OK now I'm p*ssed! I re-jetted today, putting in a 55 pilot with bleed holes, and a 150 main. I have done a 2/3 spacer mod and have a Dial-A-Jet installed. I have adjusted the mixture screw till it's just on the rich side of nominal. The exhaust is not leaking. Yet it still backfires every time I shift from 1-2 and 2-3. It does not backfire when down shifting or at shut-off, although it burbles a lot. The Raask exhaust is pretty loud and people flinch when it backfires. I have a K&N slab filter installed.
I don't know what to do next. Undecided

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white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt

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Boule’tard Serious Thumper ModSquad Offline Master of the Obvious Posts: 1620 Austin TX Gender:	Re: BACKFIRE- STILL!!! Reply #1 - 06/02/11 at 16:17:13 Since you have both the exhaust and airbox uncorked, you could probably do away with the white spacer altogether. I guess you are finding out, a straight pipe makes the savage difficult to tune. The dial-a-jet claim of "filling in the lean spots" based on a "sonic signal" is something that would be handy about now, too bad it's BS.
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Serowbot YaBB Moderator ModSquad Online OK.... so what's the speed of dark? Posts: 28645 Tucson Az Gender:	Re: BACKFIRE- STILL!!! Reply #2 - 06/02/11 at 16:52:26 If you have an open pipe,... it's gonna' afterfire...
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arteacher

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Re: BACKFIRE- STILL!!!
Reply #3 - 06/02/11 at 18:11:30

Boule’tard wrote on 06/02/11 at 16:17:13:

Since you have both the exhaust and airbox uncorked, you could probably do away with the white spacer altogether.

I guess you are finding out, a straight pipe makes the savage difficult to tune. The dial-a-jet claim of "filling in the lean spots" based on a "sonic signal" is something that would be handy about now, too bad it's BS.

I'm not sure it's BS. I've been running it all spring, set to full rich, with the stock jets, and in reasonably warm weather it's been fine, except for the backfire. I only rejetted to bring the DAJ off the full rich setting, so I wouldn't burn valves if it quit working.

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white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt

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arteacher Serious Thumper Offline Ride as if your naked and invisable! Posts: 2581 London ontario Gender:	Re: BACKFIRE- STILL!!! Reply #4 - 06/03/11 at 04:13:42 I think I might look at the TEV next.
Back to top	white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt IP Logged

CalisOsin Senior Member Offline Rather die, than live down on my knees. Posts: 297 Orange County, Ca Gender:	Re: BACKFIRE- STILL!!! Reply #5 - 06/03/11 at 09:03:45 Taken straight from the Dial-a-Jet site: "You must create a lean condition so that Dial-A-Jet has a window of opportunity to function." Perhaps you are running to rich to begin with??
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arteacher

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Re: BACKFIRE- STILL!!!
Reply #6 - 06/03/11 at 11:32:12

CalisOsin wrote on 06/03/11 at 09:03:45:

Taken straight from the Dial-a-Jet site: "You must create a lean condition so that Dial-A-Jet has a window of opportunity to function."

Perhaps you are running to rich to begin with??

According to the boys in Finland (huge Savage club) I should run a 55 pilot and 155 main with the Raask pipe and K&N filter. Originally I had the stock 145 jet in and was running the DAJ at full rich. This was 4 sizes too small! I rejetted to two sizes too small and now run the DAJ at it's mid point, as DAJ recommends.

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white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt

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Staplebox

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Re: BACKFIRE- STILL!!!
Reply #7 - 06/03/11 at 18:54:18

I don't know if this will help much or not but...

I've got a straight open Hard Krome exhaust. I am running 155 and 55 and the same K&N. And, if I remember correctly, I have 1/2 white spacer and am out about 2 full turns. I'd need to check to be sure, haven't touched it in a while.

I still get some backfiring but usually not. You may not be able to completely eliminate the BF but you can get close. I think you are one the right track. Keep tweaking.

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LANCER

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Re: BACKFIRE- STILL!!!
Reply #8 - 06/04/11 at 08:55:39

I do recommend the 55/155 with at least 1/2 spacer or less for the the K&N and Raask setup.
But as always, the differences in geographic location and variance between engines requires good tuning.
Keep in mind that assuming there are no exhaust leaks it is the pilot circuit that is dominant in controlling backfiring. Be sure the engine is responding when you are adjusting the pilot screw. You should notice a change in engine rpm with each 1/8th or at least a 1/4 turn of the screw.
If not, then you likely have some passage's clogged. It does not take much to clog them... some are almost as small as a hair so they can clog very easily and it does affect it when trying to fine tune the engine.

When I get any carb I always do a complete teardown and check and clean everything until it passes the white glove test. Then I set up a clean "surgical" area for assembly.
That is the only way to know for sure that you have a fully functioning carburetor that will respond to your tuning efforts.

There is a carb cleaning tool (Carb cleaner wires) you can get from Sudco for $10.50 + shp. It is a MUST to have if you are going to get to all of those tiny passageways. Sudco Part # 950-203

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Gyrobob

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Re: BACKFIRE- STILL!!!
Reply #9 - 06/04/11 at 09:14:25

I agree with Lancer a LOT. I treat carb disassembly/reassembly as if it were brain surgery,.. or an industrial "clean room" kind of deal. The tiniest speck of grit lodging itself on a jet or some critical hole somewhere can ruin everything.

One additional way to make sure all the passages are clear (all the old dried-fuel-varnish removed, etc.) is to put the pieces in an ultrasonic cleaner. That process peels off the unwanted coatings/chunks/etc. off of every possible inaccessible nook and cranny way inside the carb body and anything else that you put in the ultrasonic bath.

Harbor Freight and Northern tool have these machines for not all that much money. http://www.harborfreight.com/25-liter-ultrasonic-cleaner-95563.html Once you get one, you might be surprised at how many uses you find for it. For me, I started using it for jewelry, cleaning fired 9mm brass, little tools, carb parts, glasses frames, locks, pistol frames and slides, R/C model hardware, etc.

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arteacher

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Re: BACKFIRE- STILL!!!
Reply #10 - 06/04/11 at 15:22:15

Thanks for the replies guys. I spent an hour or two fiddling with the mixture screw yesterday, took it out today and the backfires are at a minimum, and not as loud- just pops now. I will try tuning the Dial-a-Jet a notch leaner and see if it runs as good as it did today. BTW I also filled the broomstick handlebar with lead shot. I calculated that I put about 12lb of shot in it. I can barley feel any vibration after it revs up to 2000.
I'm a happy camper now. Cheesy

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white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt

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LANCER

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Re: BACKFIRE- STILL!!!
Reply #11 - 06/05/11 at 05:16:15

keep in mind that when you have an open exhaust you will likely have some mild crackling/popping on deceleration, and that is ok; it's just the backfiring that is undesirable
also keep in mind that the dial-a-jet is designed to function in the 1/4 to wide open throttle; it does not work in the low range controlled by the pilot circuit.
If you want to boost the low range take a look at the UFO at Thunder Products; same manufacturer as the dial-a-jet. (this is for a Mikuni VM roundslide carb only)
It dramatically affects the low range.
If you normally do your own wrenching the install is not difficult

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arteacher Serious Thumper Offline Ride as if your naked and invisable! Posts: 2581 London ontario Gender:	Re: BACKFIRE- STILL!!! Reply #12 - 06/05/11 at 08:02:41 The UFO won't fit the stock carb-right?
Back to top	white '07, Raask exh, Corbin seat, slipstreamer shie, Raptor, Routy's fwd controls, Baron tach, Frisco bars, Isogrips, Headlight and taillight modulators, Dial-a- jet, AME 9 deg chop kit, K&N air flt IP Logged

justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: BACKFIRE- STILL!!! Reply #13 - 06/05/11 at 10:26:24 If mine didnt grumble snarl & pit Id rejet till it did..
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RpNSht Ex Member	Re: BACKFIRE- STILL!!! Reply #14 - 06/05/11 at 12:09:39 have you tried this? http://suzukisavage.com/cgi-bin/YaBB.pl?num=1268545171 i did it along with the 1/2 white spacer mod with stock jets and it solved all my problems. i recently re-jetted the carb and put on a k&n air filter...i havent fired it up yet as my bike is in pieces... but i do recommend the spring mod
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