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 Stepper motor shutoff

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supercoyote
Tanabuso
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PostSubject: Stepper motor shutoff   Fri Apr 13, 2018 6:41 pm

For any of you that have done the in line shutoff to the stepper motor, what kind of valve did you use? All I've been able to find in a small valve is 1/4" fuel shutoffs for lawn mowers, any suggestions on something for the 3/8" of the hose?
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goozy
Squinternotto
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PostSubject: Re: Stepper motor shutoff   Sat Apr 14, 2018 8:50 am

I found a direct fit at my local NAPA a few years ago.  Black plastic body red plastic knob. Looks factory.
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GuzziSteve
Fra Cristoforo
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PostSubject: Re: Stepper motor shutoff   Sat Apr 14, 2018 12:50 pm

A dirt bike aftermarket fuel valve is what I've installed.
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paulbrice
Nibbio
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PostSubject: Re: Stepper motor shutoff   Mon Apr 16, 2018 3:34 am

I fitted this [You must be registered and logged in to see this image.]

It fits the original piping on one side & I bought some extra pipe so it sat conveniently.....sad to say it has been useless and I recently removed it. I don't think the stepper issue is repeatable enough to use the tap as a quick fix & would have to re-balance the air bleed if you used it permanently
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supercoyote
Tanabuso
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PostSubject: Re: Stepper motor shutoff   Mon Apr 16, 2018 7:01 am

I ended up using the exact same one. My confusion was coming from the fact that the hose is 3/8 from sitting on the airbox nipple and expanding, but elsewhere is actually 1/4. I like to assemble parts for a project before I start it, but sometimes you don't see the whole picture until you start cutting Very Happy
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bahamazoo
Don Abbondio
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PostSubject: Re: Stepper motor shutoff   Mon Apr 16, 2018 1:41 pm

[You must be registered and logged in to see this image.]

this works a treat!
no issues since fitting
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supercoyote
Tanabuso
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PostSubject: Re: Stepper motor shutoff   Mon Apr 16, 2018 6:38 pm

Has this made a big difference for those of you that abandoned the stepper? I haven't had a chance to get out and test thoroughly after installing the shutoff, but I'd like to know if it got rid of some of the snatch when warm and the high idle problem?
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Oz1200Guzzi
Don Abbondio
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PostSubject: Re: Stepper motor shutoff   Mon Apr 16, 2018 8:51 pm

High idle is fixed for sure. Snatchiness is between throttle cable adjustment and a good map.
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paulbrice
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PostSubject: Re: Stepper motor shutoff   Tue Apr 17, 2018 12:23 am

Agree it's just for high idle but it didn't work at all for me. Engine won't idle with the valve shut completely & trying to balance random high idle problem out by partial twiddling valve sitting in traffic was PITA easier solved by blipping throttle or just waiting for it to set down.....I can imagine (cos I've been too lazy to check) you could shut it in and open the air bleed a bit to stabilise idle IF the actual cause is the stepper itself

I just pull & clean the TB assembly when it gets really bad which isn't often.



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bahamazoo
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PostSubject: Re: Stepper motor shutoff   Tue Apr 17, 2018 3:02 am

I always found that the high idle could be 'fixed' at the lights by just engaging the clutch in gear with the brake on...
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kiwi dave
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PostSubject: Re: Stepper motor shutoff   Tue Apr 17, 2018 2:29 pm

I fitted a pneumatic valve on my 1200 Sports (2V) x3 to fix high idle. As soon as the engine gets up to temperature, the stepper motor is switched out of circuit. The increase in engine braking is enough reason to do this.

But the idle on my GRiSO 1200SE is fine, so what's not broke I don't fix.
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GuzziSteve
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PostSubject: Re: Stepper motor shutoff   Wed Apr 18, 2018 5:46 am

I will bet it has a metal stepper, new plastic ones are real pricey.
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