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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Midrange/half throttle issues [SOLVED BY MAGIC] /cgi-bin/YaBB.pl?num=1398780212 Message started by Bluesman on 04/29/14 at 07:03:32 |
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Title: Midrange/half throttle issues [SOLVED BY MAGIC] Post by Bluesman on 04/29/14 at 07:03:32 Guys - the issue that lead me to retrofit the stock airbox (and rejet plus fit a different muffler) - is still there. Bike idles fine, but on slow to medium take-off throttle is stutters a little and loses power, like there is no ignition or too little fuel now and then. At full throttle, the problem is almost gone. The plug is brushed and burnt clean of any residue, battery is full. Fresh gas. Now...I did NOT take off the top of the carb when rejetting. I blew the floatbowl things and channels clean when apart, but I must have missed something. Could this be the needle jet clogging up? The symptoms are identical to before I started tearing things apart. Setting the petcock to Prime or RES changes nothing. Why oh why didn´t I split the whole thing while at it? :-[Or could this be ignition-related, like in oxidized connectors/intermittent earth loss and/or failing CDI box? |
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Title: Re: Midrange/half throttle issues Post by Dave on 04/29/14 at 07:12:19 Sounds like you have a mid-range lean condition. That is what the white spacer mod corrects. You need to remove the top of the carb, pull the slide out, remove the 2 small screws that hold the needle in place (always a challenge getting those screws out), and replace the white plastic spacer with 3 thin metal washers.....2 worked best on my carb.). The little metal washers are generally about the same thickness when you find the right diameter ones at the hardware store. This modification raises the tapered needle and allows more fuel to flow in relation to the slide position. http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1104205157 |
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Title: Re: Midrange/half throttle issues Post by Bluesman on 04/29/14 at 07:15:44 Hm. The funny thing is that the bike ran fine all winter. I put 800+ km behind me without even a single backfire or any stuttering at all. Now, with weather getting 15-20C the bike starts acting up. Could the warmer weather make it into a white spacer issue? (Edit: I did that mod (shaved half of it off) on the young ladys´bike, as a routine thing, but not on mine) |
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Title: Re: Midrange/half throttle issues Post by Dave on 04/29/14 at 07:22:35 No clue as to why it happens now.....but it sounds like mid range lean issue. Generally when there is a weakness in the ignition system - it becomes worse under full throttle. When the cylinder is full of air and fuel the ignition system must work harder for the spark to jump the plug gap. With the symptoms you are describing....I would first check the carb. |
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Title: Re: Midrange/half throttle issues Post by Bluesman on 04/29/14 at 07:23:51 I will. Thanks for the advice! |
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Title: Re: Midrange/half throttle issues Post by Serowbot on 04/29/14 at 07:59:24 Sounds like a sticky slide... Open up the top, pull it out and clean it... Make sure it moves up and down free and smooth... |
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Title: Re: Midrange/half throttle issues Post by Dave on 04/29/14 at 08:07:14 3325322F37222F34400 wrote:
Oh......That could be it as well! That might also explain why it ran OK a while ago - but doesn't now. Time for a spring cleaning! |
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Title: Re: Midrange/half throttle issues Post by justin_o_guy2 on 04/29/14 at 08:40:04 Yep,, the jetting didnt change.. the only answer I can think of is a slide not slidin right. |
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Title: Re: Midrange/half throttle issues Post by Bluesman on 04/29/14 at 11:34:07 Yes, probably a clogged needle jet or a sticky slider. Like a miracle, it disappeared. I took the bike for a healthy spin in order to cook it properly. And yes, after a series of stop-n-go kilometres, some stretches at full throttle and almost redlining (oh, the joy with the new "silencer" :-) ) the issue disappeared magically. Phew. Smiling ear to ear after that, I took a break for some 20 minutes, overlooking a peaceful "sunset over the Öresund and Copenhagen" scenery. Fed up with that, I went back to bike to find the battery totally flat. I forgot to switch off. Lights and all on... Thank you, magic :-) I had to 2nd-gear jumpstart the little mofo with whatever juice was left for the ignition...but that was o cool price to pay for this issue :-) <<all smiles 8-) 8-) 8-) |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by S-P on 04/29/14 at 18:18:42 Niiiiice end of the story! Magic is a good thing! :) |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Super Thumper on 04/29/14 at 19:20:21 Do you have a fuel filter on it? After blowing it out at high RPM and now it runs fine sounds like crud in the gas. |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Bluesman on 04/29/14 at 22:38:56 Nah, just the stock petcock filter. Raptor on its way, will have to make do until then. Fingers crossed. :-) |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Oldfeller on 04/30/14 at 05:08:10 He's got a stock petcock filter ???? Do you still have a stock petcock ???!!!! ..... and nobody asked him either. The stock petcock going bad can give the same sort symptoms that you have been describing up thread. ::) |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Super Thumper on 04/30/14 at 06:51:09 OMG!! A stock petcock? The horror, the horror...... :o |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Oldfeller on 04/30/14 at 07:19:06 Yep, the horror of it all, the stock vacuum actuated petcock. :-/ :-/ :-/ :-/ :-/ :-/ List of things he's tried: Pulled and replaced stock air box muffler rejet plug Issues diagnosed Sticky slide Half spacer Midrange lean Ignition related Now, let's see what remains after he gets his Raptor in place. People wonder why I keep telling folks to yank the stock vac petcock off their bike first thing whenever they START their Mods -- because if you don't you get lost in all the muddy water that it creates spontaneously and sporadically and occasionally on its very own. The vacuum level needed to run the stock vacsucker correctly DEPENDS on all the stock pieces being in place, especially on the air filter end of things. Start your mods before Raptorizing and that practically guarantees a world of confusion & trouble soon to arrive. Sad thing is that folks flat screw their bike all up messing and fixing with this and that and the other thing and then have to go UNSCREW it all once the Raptor goes on and the murky water abates. |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by justin_o_guy2 on 04/30/14 at 08:01:24 Murky waters To the tune of Pretty Woman by Roy Orbisson Murky waters, of our own design' murky waters theyll make us blind murky waters Oh theyll deceive you thats what theyll do No No you shouldnt adjust that screw but I know thats what youll do Its something else you'll have to undo. Whoa Whoa Murky waters.. Wooo woo Murky waters.. |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Oldfeller on 04/30/14 at 14:51:32 Sung to the tune "Do you believe in magic?" Do you believe in magic, that it can fix your bike? Turn all them screws to make it right? Do all them things with which you used to fight? Master all those things you never understood, And right all the wrongs that you never could? If you believe in magic, that it fixes all illls, We'll induct you into the category of :-) "Bill" :-) |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Bluesman on 04/30/14 at 15:09:57 hey guys... I am waiting for the Raptor, the corrector of all things evil, to arrive. Meanwhile, I actually got the bike running quite well by rejetting it from a horrendous 180 to a 152.5, while keeping the stock idle jet (47,5), swapping the exhaust to a more open BSM, and reverting it to a stock airbox from a K&N. I love it the way it runs just now. So does my pillion passenger. What´s wrong with you all? 8-) |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by swedishbiker on 04/30/14 at 15:21:30 2F0C0406050C0C0512600 wrote:
;D maybe because of that my bike runs so nice, stock petcock. Been there since 1993, 34000km or in miles 21126. Or might it be the old gas I use? Have gas that are many years and still do run an engine just fine. |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by shorty on 05/01/14 at 10:23:44 180 main jet? holy crap batman |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by HAPPYDAN on 05/01/14 at 11:26:05 Amen, Oldfeller! ;D |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Dave on 05/02/14 at 03:41:33 404456575A405B515A585641330 wrote:
;D maybe because of that my bike runs so nice, stock petcock. Been there since 1993, 34000km or in miles 21126. Or might it be the old gas I use? Have gas that are many years and still do run an engine just fine.[/quote] In the US our fuel has 10% ethanol in it. The ethanol can dissolve rubber parts, and it does not stay fresh very long. Most small engine manufacturers for seasonal equipment like lawn mowers and chain saws want you to drain the fuel if the engine will not be used for 2 months. The fuel you buy in Sweden is most likely far different than what we buy in the US, and you may not have the problems that we experience with the stock petcock. New owners have very often experienced very confusing and elusive problems with their bikes, and have spent a lot of time trying to find out why their bike runs so poorly. Very often it can be traced to the petcock - especially on bikes that have been sitting for a while. When dormant the fuel does not stay fresh, and the ethanol can work magic on dissolving the rubber parts. Here in the US the stock petcock can go a long time on a bike that is ridden often enough that the fuel is kept fresh. |
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Title: Re: Midrange/half throttle issues [SOLVED BY MAGIC Post by Oldfeller on 05/02/14 at 03:56:44 Sung to the tune "Love and Marriage" Mods and petcocks, Mods and petcocks, go together like broken head-rocks if you you do them backwards your bike will do things wackerds Remember now, Get your Raptor in place first then you problems won't be worse Mods and petcocks, Mods and petcocks, go together like broken head-rocks I think he's saying he DOES run all the stock components and his vac petcock still works as designed. Which is the point being made with the mod boys here in America, you HAVE removed a bunch of the stock components so you shouldn't be expecting your stock vac petcock to function correctly any more. And a bad vacsucker can mock so so many different issues, really it can. Also, Sweden -- is it a graduated license country? If so, perhaps does his Savage might have a restrictor plate or zone under or in its rubber intake manifold construction? The Savage is sold in the graduated license countries as a under 25hp bike to meet all the requirements of a starter bike. ;) People keep noting that Savages in some countries use some strange carb modifications too |
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