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› vm36 , backfires and cuts out at 1/4 throttle
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vm36 , backfires and cuts out at 1/4 throttle (Read 311 times)
Finney138
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vm36 , backfires and cuts out at 1/4 throttle
08/22/12 at 09:54:17
ill start off with some background, stage 1 cam /ported exhaust /mostly straight through slip on exhaust does have some baffling tho/ running a "U" intake tube from air filter to carb, the VM has a UFO and dial a jet.
it runs great at idle except the odd stumble when its hot, pulls strong as long as im giving it more throttle all the the way to wide open ,if i try to hold it at 1/4 throttle it stumbles alot and pops and cuts out but keeps on truckin. pretty much the same thing happens at any throttle position if i hold it in one position for too long (sucks for trying to keep a steady speed) another thing that happens when i come to a stop i have to give it a little throttle to keep it from dying completely. seem to be burning more gas than average too.
any ideas would be helpful. thanks in advance
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Dave
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #1 -
08/22/12 at 10:18:04
Have all these changes (cam, porting, exhaust, carb) been made at the same time?
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bill67
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #2 -
08/22/12 at 10:24:36
Sounds like slide maybe sticking,or jet needle needs adjusting. Did it run right at one time.
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #3 -
08/22/12 at 10:29:07
Sounds to me like you just built yer'self a drag bike...
...
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Finney138
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #4 -
08/22/12 at 10:52:18
dave everything except the exhaust was done over the winter, when i took my exhaust off to take my right side cover i broke the mounting bolt off the slip on so i ditched it for the new more straight through one.
bill67 it ran perfect before the winter haha, it turned over first shot when i put everything back together but ran terrible, runs pretty good now except for this issue, ive been running it the way it is for a while now just to be on two wheels, i would like to get this fixed before i have to put it away for this upcoming winter
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Finney138
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #5 -
08/22/12 at 10:53:36
serowbot thats what it feels like to me too haha, poppin wheelies and everything just cant run at normal people speeds.
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #6 -
08/22/12 at 10:56:02
Do you still have the stock carb in the corner of your garage somewhere? Am I asking too many questions?
Have you reead the thread oh the UFO?
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1149364740/0
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Finney138
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #7 -
08/22/12 at 11:23:21
used my old carb as part trade for the cam, wish i didnt so i could compare but this is the boat im in now, i read that thread a while ago i made my slide seat properly with instructions from lancer and it was a big improvement. my pilot is soldered shut may still be a little rich on idle but no smoke
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teabowl13
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #8 -
08/22/12 at 11:46:41
If the exhaust is the only thing that changed, I'd start there. Sounds like a more straight through exhaust with your set-up is going to make your bike more of a race rocket, and also much less road-friendly.
Maybe there's a way to add more baffling and/or more backpressure to your new exhaust to bring it back closer to your original setup?
I assume you re-jetted the carb when you installed the new exhaust... maybe go back to your first jet settings and try to tune the exhaust to fit your jetting rather than the other way around (I know that seems totally backwards, but you might get a more user friendly experience from dialing back your set up a little bit...)
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VINTAGE ROADSTER BUILD:
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #9 -
08/22/12 at 11:53:19
Finney138 wrote
on 08/22/12 at 09:54:17:
ill start off with some background, stage 1 cam /ported exhaust /mostly straight through slip on exhaust does have some baffling tho/ running a "U" intake tube from air filter to carb, the VM has a UFO and dial a jet.
Could be you dial a jet, could be your ram air intake.
As far as I've seen, dial a jet takes a complex situation and kicks it up a notch. I think you'd be better off w/out it.
And ram air, don't know anybody with it, so you're gonna have to work out some issues yourself.
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teabowl13
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #10 -
08/22/12 at 12:03:31
Yeah... you've got a lot going on...
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VINTAGE ROADSTER BUILD:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1323582921
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Finney138
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #11 -
08/22/12 at 13:07:04
i was thinking about baffling my pipe a bit more.
ill try running it with the dial a jet unhooked tn.
also gonna have to try er with out the intake tube, really wanna keep that tho.
yea its alot goin on but only one problem ,hopin someone may have ran into this one in the past, if not my troubleshooting might open up some doors for someone else.
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teabowl13
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #12 -
08/22/12 at 21:54:45
Actually, I'd like to know what you mean by a "U" shaped intake tube; do you have a picture of that?
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VINTAGE ROADSTER BUILD:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1323582921
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Finney138
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #13 -
08/23/12 at 05:29:08
heres what the intake looks like
heres what the whole thing looks like
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teabowl13
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Re: vm36 , backfires and cuts out at 1/4 throttle
Reply #14 -
08/23/12 at 06:31:48
THAT looks the business for sure!
I don't want to hijack your original topic, but I'd love to know more about how you came up with this thing, how you jetted the carb for it, how it works etc.... I might just have to copy you when the time comes. Got a lot of other projects ion the bench right now...
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VINTAGE ROADSTER BUILD:
http://suzukisavage.com/cgi-bin/YaBB.pl?num=1323582921
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