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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> where to get carb mix screw? /cgi-bin/YaBB.pl?num=1507480850 Message started by SugarBoogers on 10/08/17 at 09:40:50 |
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Title: where to get carb mix screw? Post by SugarBoogers on 10/08/17 at 09:40:50 Hi all. I haven't been here in a long time (a year?) because frankly my bike doesn't give me any problems ::) The PO buggered over my air mix screw. I have the classic backfire on shutdown, and at the same time, I have black soot on my rear brake linkage/drum. So, I don't know if it's rich and lean at the same time :D I has a Jardine "muffler" and a K&N Lifetime air filter in the stock air box. Poss. it could stand to be rejetted, but it seems to run fine in all aspects. I was thinking I should do first things first. A brief search shows $28 shipped on bikebandit for screw, spring, washer, and o-ring. Where can I get that air screw most cheaply? |
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Title: Re: where to get carb mix screw? Post by Dave on 10/08/17 at 13:07:47 The mixture screw is a factory part - you can only get it from someone that sells Suzuki parts. The explosion on shut down occurs because you have turned off the ignition - but as the engine is coasting to a stop it continues to pull air through carb, and pump the air/fuel mix out the engine and into the hot exhaust pipe. Once the hot header and muffler heats the unburned fuel/air mix to the ignition temperature - it explodes in the exhaust. The more open the exhaust is, the louder the bang! Lowering the idle speed can help reduce the number of revolutions it takes for the engine to come to a stop - which can reduce the amount of air/fuel in the exhaust and therefore reduce the explosion. Just be sure to keep the idle speed above 1,100 so you have good oil pressure at idle. You can also keep the bike in gear and use the clutch to slow the engine down faster when you turn off the ignition - use the kill switch to shut off the ignition as you will need your left hand to feather the clutch. I also wonder if opening the throttle with your right hand as you turn off the ignition would help? It sounds counter intuitive - but when the butterfly opens it reduces the vacuum at the idle circuit holes in the carb, and it may actually reduce the amount of fuel being mixed with the incoming air......Are you brave enough to try it and be the first one to experiment with this concept? |
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Title: Re: where to get carb mix screw? Post by Eegore on 10/11/17 at 12:12:16 Dave one of my bikes sounds like a rifle when I shut it down. Coasting reduces the sound a bit, and using 1st to slow and dropping the stand, or kills-switch reduces it a significant amount. Holding the throttle open and dropping the kickstand makes it sound like a cannon. Just an FYI. |
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Title: Re: where to get carb mix screw? Post by Dave on 10/11/17 at 12:47:24 022220283522470 wrote:
Wrong order.....drop the kickstand to kill the ignition, then immediately open the throttle. You want the rpm as low as possible when you kill the ignition by using the key or kill switch or kick stand. |
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Title: Re: where to get carb mix screw? Post by Eegore on 10/12/17 at 08:28:48 Ahh ok I will try it when I get back to CO. Kill bike then open throttle. |
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Title: Re: where to get carb mix screw? Post by batman on 10/12/17 at 12:34:38 Or go the other way ,shift into neutral,let the motor fall to idle,and pullout the choke just before hitting the kill switch. |
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Title: Re: where to get carb mix screw? Post by Dave on 10/12/17 at 13:16:58 3437223B3738626E560 wrote:
Seems to me that would put "more" fuel in the exhaust........not less. Opening the throttle would cause the butterfly plate to move the flow of air away from the idle circuit port in the carb throat, and the flow of fuel would drop considerably and less would be available to fuel the explosion. |
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Title: Re: where to get carb mix screw? Post by Kris01 on 10/12/17 at 18:26:53 Why does opening the throttle after the stand goes down help to eliminate the shutdown pop? |
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Title: Re: where to get carb mix screw? Post by Dave on 10/12/17 at 18:57:07 It is just a theory at this point....it needs to be proven. When the throttle is closed, the butterfly has most of the carb throat blocked off, and the engine vacuum pulls air past the small holes where the small amount of fuel necessary for idle is added. Dropping the kick stand while the transmission in gear will kill the ignition, or you can turn off the key or use the kill switch. I believe that when the ignition is turned off and the engine is slowing down - opening the throttle will open the butterfly and the air will have the entire carb throat to flow through - so the amount of air will increase but the velocity of the air at the edge of the butterfly where the idle fuel ports are will drop dramatically.....and I believe it will not have enough velocity or vacuum to pull the fuel out of the idle circuit. |
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Title: Re: where to get carb mix screw? Post by LANCER on 10/14/17 at 05:22:45 Leaving the bike in gear and at idle, I let up on the clutch lever just slightly (not moving though) as I hit the kill switch. The engine just stops. No pops. |
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Title: Re: anti pop Post by buster6315 on 10/14/17 at 19:31:12 I, for one, rather like my 'poof' at shut-off. I don't find it objectionable in the least. :) |
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Title: Re: where to get carb mix screw? Post by justin_o_guy2 on 10/14/17 at 23:04:07 Have you always been a Poofter or is that a recent development? |
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Title: Re: where to get carb mix screw? Post by LANCER on 10/15/17 at 01:47:01 Personally, I've been known to POOF from time to time. ::) |
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Title: Re: anti pop Post by Dave on 10/15/17 at 03:47:34 66717770617632373531040 wrote:
If the idle speed is a bit fast, the idle mixture is lean, and you have a free flowing muffler........the POOF can actually be a shotgun blast! :o The only time my bike will make any sort of sound is if I have been running pretty fast and got the exhaust system really hot. If there is any slow riding to get to a parking space or through traffic, the exhaust cools down enough that I don't get any noise when the bike is turned off. |
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Title: Re: where to get carb mix screw? Post by Ruttly on 10/15/17 at 15:07:05 The only time I got anything was during tuning, got a small pop when it was shutdown , I already knew it was lean by lack of giddy up n go ! |
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Title: re: poofer Post by buster6315 on 10/15/17 at 19:22:23 Yep, I have been a poofer for a few years now. (bad O-rings!) |
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