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› Loss of power climbing hill
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Loss of power climbing hill (Read 294 times)
ohiomoto
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Re: Loss of power climbing hill
Reply #30 -
08/20/19 at 06:05:42
ohiomoto wrote
on 08/19/19 at 12:00:45:
It's on
RPM
COMPRESSION RATIO WAR!!!!
...
------------------------
I had to go back and fix my last post.
Hey has anyone heard from TTom, the OP that started the thread that you all took over??? LOL
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Dave
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Re: Loss of power climbing hill
Reply #31 -
08/20/19 at 06:42:32
So....back to the original problem.
I suspect that if the bike has the original vacuum operated petcock, the diaphragm may be getting stiff.
On the long climb and open throttle, the amount of vacuum in the intake may not have been sufficient to keep the petcock open and you ran out of fuel in the carb.
Try climbing the hill again and see if the bike quits, and if it does turn the petcock to PRI and see if it keeps running.
As mentioned previously - you should get the official Yamaha Raptor petcock (it should be around $30 and come in a white box with the Yamaha part number5LP-24500-01). If you find one that is less than $15 and doesn't show the white box - it is a Chinese copy and you should avoid buying it.
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batman
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Re: Loss of power climbing hill
Reply #32 -
08/21/19 at 06:24:04
Dave ,If your right and he is running the stock petcock , I think you may have it the ball out of the park! ( he could test the stock petcock in RES.)
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Dave
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Re: Loss of power climbing hill
Reply #33 -
08/21/19 at 07:55:42
batman wrote
on 08/21/19 at 06:24:04:
Dave ,If your right and he is running the stock petcock , I think you may have it the ball out of the park! ( he could test the stock petcock in RES.)
The petcock in reserve still uses the diaphragm to open/close the fuel flow (just allows a lower fuel level)......in PRI there is a metal tab that pushes the diaphragm open and allows fuel flow without any engine vacuum.
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batman
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Re: Loss of power climbing hill
Reply #34 -
08/21/19 at 09:07:14
Yep ment to say pri
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TTom
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Re: Loss of power climbing hill
Reply #35 -
08/21/19 at 12:04:15
I'm not one of this forums more mechanically inclined individuals. Isn't it a little unusual for a 6 year old bike to have a hardening diaphragm? I haven't been out on it yet on this hill but probably will this weekend. From what I'm reading, I was being a little lazy by not shifting into 4th going up this hill.
Not sure if I'll be replacing petcocks anytime soon but am thankful you guys pointed to this as a potential source of trouble.
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Gary_in_NJ
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Re: Loss of power climbing hill
Reply #36 -
08/21/19 at 12:20:39
TTom,
A couple of fact of life when owning a Savage.
1. The Petcock will fail. It can fail in as little as two years. Just because your bike is new-ish, Suzuki's inventory may not be.
2. When the petcock fails, it can present as a number of different failures.
As a measure of prudence, why not change it.
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justin_o_guy2
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Re: Loss of power climbing hill
Reply #37 -
08/21/19 at 12:22:15
Isn't it a little unusual for a 6 year old bike to have a hardening diaphragm?
Not really. There's no pattern of predictability with them.
Thing is
If you ditch it for a Raptor a variable will be gone and a future failure will be avoided.
When the Petcock goes south the symptoms can be confusing.
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TTom
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Re: Loss of power climbing hill
Reply #38 -
08/21/19 at 12:32:12
Thank you guys. This is all very helpful. It's sounds like a faulty stock petcock is more of a slow death than a quick one.
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Dave
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Re: Loss of power climbing hill
Reply #39 -
08/21/19 at 12:37:00
TTom wrote
on 08/21/19 at 12:04:15:
Isn't it a little unusual for a 6 year old bike to have a hardening diaphragm?
One of the issues that may contribute to the demise of the diaphragm, is the ethanol fuel that the US uses. I am not sure the diaphragm is made from a material that is resistant to ethanol.
The fact that your bike quit in a situation that creates low intake vacuum (long steep hill and the requirement for more than normal throttle) put you in a situation where the engine vacuum was not sufficient to open the gradually stiffening diaphragm.
The bottom line is this the stock petcock is a problem on the Savage and it can cause problems (engine cutting out, fuel in air box and oil sump, engine running rich, poor fuel mileage).....and you just need to trust us old farts who have been around this bike for a while.
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TTom
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Re: Loss of power climbing hill
Reply #40 -
08/21/19 at 12:44:33
Too bad this isn't a case of the more you use it, the more flexible it becomes.
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ohiomoto
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Re: Loss of power climbing hill
Reply #41 -
08/22/19 at 08:50:49
Oh, you guys mean that it's possible that it's NOT user error or some sort of alien rpm/compression conspiracy theory??? You mean it could be the stock petcock??
Where have I heard that before?? Oh, that's right in reply #4. haha
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batman
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Re: Loss of power climbing hill
Reply #42 -
08/22/19 at 11:40:35
That's funny ,I didn't know petcocks had worn slides.
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«
Last Edit: 08/22/19 at 22:14:32 by batman
»
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