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Message started by wolfmrp on 05/08/10 at 12:10:15

Title: Bike dies going down hill
Post by wolfmrp on 05/08/10 at 12:10:15

So this has happened twice now in the same place. It is a short but step hill with a stop light at the bottom. When I clutch in to break for the light the engine just dies. I can hit the starter and she fires right back up(still on the incline). I have had no other problems. Any ideas?

Title: Re: Bike dies going down hill
Post by Phelonius on 05/08/10 at 12:36:48

Fear not, the engine is not needed going down hill. When you are on level, start it back up and go up hill under power.

Phelonius :o :o :o ;D ;D ;D ;)

Title: Re: Bike dies going down hill
Post by dasch on 05/08/10 at 12:38:14

Hmmm... strange challenge. Low fuel level in the carb bowl?

Title: Re: Bike dies going down hill
Post by bill67 on 05/08/10 at 12:48:18

Idle might be set to slow.

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/08/10 at 13:04:33

My idle is set at 1600 (I have a tech). I am running a raptor petcock on a vn 750 tank. It was just filled yesterday and died this morning. I cleaned the carb about a month ago. It does not sputter or choke it just dies as soon as the clutch is pushed in. I was even able to restart while still rolling down the hill. :-?

Title: Re: Bike dies going down hill
Post by dasch on 05/08/10 at 13:12:08

does it ever die when you clutch in on flat ground?? Ever?

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/08/10 at 13:16:45

Nope. I have no other problems. Well, a slight deceleration pop but that's it. ;)

Title: Re: Bike dies going down hill
Post by Serowbot on 05/08/10 at 13:25:07

1600 is a little high for the idle, but that's not the problem...

Try lubing the kickstand... :-?...
I'm serious...

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/08/10 at 13:29:25

I have EdL's Forward controls. The kickstand switch has been disabled, if that is what you are getting at.

Title: Re: Bike dies going down hill
Post by Serowbot on 05/08/10 at 13:34:47

41595A505B4446360 wrote:

The kickstand switch has been disabled, if that is what you are getting at.

Rats!.... I'm berfuffled... :-?...

Try disconnect/reconnect the clutch lever cut-out connector?... :-/...

Title: Re: Bike dies going down hill
Post by verslagen1 on 05/08/10 at 14:24:00

I've got to say... great sig wolf. [smiley=thumbsup.gif]

The high idle and going down hill engine braking have got to be the clue.

generally, high rev decel to idle peoples engine die cause of low idle.

So, with your high idle speed you may not have a good idle adjustment.

So when it dips down there it falters and dies.

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/08/10 at 18:40:02

I will lower my idle and see if that helps. 1300 sound right?

Title: Re: Bike dies going down hill
Post by verslagen1 on 05/08/10 at 18:59:47

766E6D676C7371010 wrote:

I will lower my idle and see if that helps. 1300 sound right?

not saying high idle is bad, just wondering if it's masking the problem.
adjust your carb in the 1000 to 1200 range then boost it up to where you like it.

btw, my bike will run that high when it's hot

Title: Re: Bike dies going down hill
Post by Routy on 05/08/10 at 20:30:01

Is there any white smoke before it dies ? Under hard hi rpm decelleration, manifold vacuum is maxed out, and any weakness in valve guides or seals will let excessive oil into the cylinder,.....possibly causing missing spark ?? Hey,....its a guess :-/

Title: Re: Bike dies going down hill
Post by abotech on 05/08/10 at 20:32:47

Check that you have free play in the throttle cable.

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/09/10 at 13:32:10

The high idle was masking the problem. When I set the idle lower she dies on flat ground from high rpm to rapid deceleration. There is no smoke or pop just a drop in rpm. With the idle set higher I can see the rpm dip unhappily low under rapid deceleration with the clutch in. Is this a carb issue? All help is appreciated.

Title: Re: Bike dies going down hill
Post by Serowbot on 05/09/10 at 13:39:05

Sticky needle slide, maybe?... :-?..

Title: Re: Bike dies going down hill
Post by dasch on 05/09/10 at 14:10:01

Try on PRI. Same thing was happening to me. After decel, it would just die. Turned out the membrane in petcock had a small leak. I run it on prime for now.

Title: Re: Bike dies going down hill
Post by Charon on 05/09/10 at 14:24:26

I'm going to make a guess here that it is carburetor related. But it isn't a failure, as such. The idle jet fuel feed is at the front of the float bowl. On rapid deceleration the fuel sloshes toward the front of the bowl and makes the idle mixture go too rich. The rich mix causes the engine to stumble and maybe die. Decelerating and braking down a hill would make it worse. The engine can't quit turning until you squeeze the clutch, so it seems as if squeezing the clutch causes the engine to die. Once stopped the fuel becomes "level" again, so the engine will start right up.

Title: Re: Bike dies going down hill
Post by Routy on 05/09/10 at 16:18:15

I'd buy that !

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/09/10 at 22:45:50

Dasch, I am running a raptor petcock so i don't think that is the issue.

Charon, That sounds reasonable to me. Any idea how I stop it from doing that? I am a fairly new rider could it be something in my breaking technique?

Title: Re: Bike dies going down hill
Post by dasch on 05/10/10 at 00:29:47

No, definitely not the problem, wolf. :-[

Title: Re: Bike dies going down hill
Post by BurnPgh on 05/10/10 at 12:02:53

how far out is your idle mix screw? Might need to do a little idle circuit tuning. Messing with the mix screw should do. If its tuned right the engine should return to idle fairly smoothly even on rapid decel.

Title: Re: Bike dies going down hill
Post by verslagen1 on 05/10/10 at 13:54:24

273F3C363D2220500 wrote:

AHA! (oops, missed your reply till now)
I know the answer, the mysterious air shutoff valve.
That little doohickie (triangle shaped diaphragm next to the idle mixture screw) is supposed to do something when the throttle is cut durring high vac conditions.
Start with a thourogh cleaning and inspection.
There's also been a discussion about shortining the spring to reduce backfire.

Title: Re: Bike dies going down hill
Post by wolfmrp on 05/11/10 at 14:03:52

I adjusted the mixture screw this morning and the idle seems more stable on rapid deceleration. I have not hit a hill yet but I think it may have been that simple.

Thanks to everyone that posted. This forum is one of the best parts about owning a savage. Well... that and having a kick ass bike. 8-)