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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> fuel mix tuning for high altitude /cgi-bin/YaBB.pl?num=1367693997 Message started by incensetragedy on 05/04/13 at 11:59:57 |
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Title: fuel mix tuning for high altitude Post by incensetragedy on 05/04/13 at 11:59:57 first post from a long time lurker. i bought this '96 savage bone stock about a month ago. (please see my first reply for the image) when i put the dyna muffler on it started backfiring like crazy which i've heard is typical. yesterday i pulled the air box and replaced it with a cone filter (wouldn't fit on the carb directly so i used that rubber hose) and relocated the electronics. i put an inline gas filter onto the crank case breather and ran it under the bike, and finally drilled out the mixture screw and gave it a half turn counterclockwise. the backfiring is probably 75% gone and i get a nice tone out of the intake. of course there are issues... first, if i leave it sit for more than a couple hours i'll have to pull the choke one click to get it to start. i can push it back in immediately, and once it's warmed up it runs great. also, the power curve is a little jumpy in the low gears neither of these are a huge deal to me but i want to ask if there's a possibility that i'm doing damage to the engine. i live just about a mile high here in colorado which is what makes me hesitate to rejet cause i figured the lean stock mix might be perfect for this altitude. |
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Title: Re: fuel mix tuning for high altitude Post by incensetragedy on 05/04/13 at 12:00:29 sorry, it wouldn't let me post the image in the OP cause it was my first post :\ http://https://lh6.googleusercontent.com/-1U0ul35GsbA/UYVVQ-1FhAI/AAAAAAAABzk/dHb_i8dtvNQ/s720/P1010940.JPG |
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Title: Re: fuel mix tuning for high altitude Post by Serowbot on 05/04/13 at 12:07:03 You're probably pretty good... a little choke, on a cold engine in Colo. is okay... If anything,.. I'd leave the pilot stock, and maybe go to a #150 main... Try this test, if you like... Quote:
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Title: Re: fuel mix tuning for high altitude Post by incensetragedy on 05/04/13 at 12:29:25 thanks for the tip! going for a long ride today, i will try that out and let you know. |
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Title: Re: fuel mix tuning for high altitude Post by Digger on 05/04/13 at 18:27:38 Incense, I live in the Springs (my house is at 6500' ASL). My bike (see signature) has stock jetting and runs well up here....no complaints! |
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Title: Re: fuel mix tuning for high altitude Post by incensetragedy on 05/04/13 at 20:18:14 digger - i bought my bike down in the springs! i'm up in longmont. serowbot - i think i am indeed lean on the main jet. i was cruising at about 65, coasted down to about 35 and opened the throttle, and when i let off the engine revved real high for maybe 2 seconds. felt kinda like the clutch was slipping. does that sound like what you are describing? |
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Title: Re: fuel mix tuning for high altitude Post by Serowbot on 05/04/13 at 23:59:12 Incense,... that's actually a little clearer signal than I would expect... ...but, we may chalk that up to intense concentration,.. Just to be sure... give it one more try... Get going,... calm and steady, at 35mph... then open up to full throttle, for a few seconds... as you feel it pulling strong,... just ease off a small fraction... See if you perceive a little, up-kick, before the deceleration happens... ... (that's been my perception.... just a slight, kick... for maybe a half, or a quarter of a second, before decel)... It may just be, that it appeared more intense, because I told you to look for it... Try the test one more time,.. and go with your best judgement... if you do go up to a #150,... and it's not beneficial... you can always go back down... ;)... |
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Title: Re: fuel mix tuning for high altitude Post by Bubba on 05/07/13 at 07:13:56 incense...I'm in Denver...look in my signature line for my set up... I have to tell you, I was pretty much digging into the carb mods and such when I bought my exhaust like 3 years ago...haven't done very radical mods to the stock setup. I just recently pulled the snorkle off the airbox (pretty much eliminated my backfire on shutdown)...don't ask me why/how but it did and I'm sticking to it... ;D My bike is running really, really well and i have to force myself not to mess with it too much... |
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Title: Re: fuel mix tuning for high altitude Post by Bobby on 05/08/13 at 05:42:24 5B6C7B7B782829212A190 wrote:
I'm new to working on these LS650's Can you explain what you meant by pulling the snorkel off the air box? I'm trying to get my wife's savage from back firing on decel. thanks, B-smith ;D |
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Title: Re: fuel mix tuning for high altitude Post by Bubba on 05/08/13 at 06:25:43 Well, every bike is different and it may impact you or it may not. I also have a K&N drop-in filter in my airbox and some of the effect may be from that too. Anyway, the part is #10 in this fiche: http://www.ronayersmotorcycles.com/fiche_section_detail.asp?section=298929&category=Motorcycles&make=SUZUKI&year=2005&fveh=7222 It's just a flow director of some sort but , for me, it seemed to allow for better airflow through my system. I was truly amazed that my shutdown "pop" disappeared after removing it. I've messed with my airmix screw a lot trying to get rid of it and it never fully disappeared. I live at a mile high and I still get "pops" sometimes between shifts (depending on weather)...I'll be interested to find what it does when I ride up higher (10,000 ft). I always get lots of "snap,crackle,pops" when I ride down the passes and do a lot of engine braking... :P |
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