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Stepper motor on/off kit

GrahamNZ wrote:
Todd

Does your kit comprise of a switchable solenoid valve in the line from the airbox to the stepper motor?

Apart from the benefits of being able to isolate the stepper motor once the engine is warm, being able to do so when adjusting the air bypass screws during the idling phase adjustment when vacuum balancing would also be a help. Yesterday I did a vacuum balance and noted the way the balance at idle never remained absolutely constant, presumably because the stepper motor kept butting in.
Click to expand...

Ive noticed the same thing Graham, The balance is rock solid on my V7 (No Stepper Motor) but tends to wander a bit on the Norge, I am hoping it will cure the popping on decel unless I do judicious throttle control, which can't be done in all situations.
 
GrahamNZ wrote:
Does your kit comprise of a switchable solenoid valve in the line from the airbox to the stepper motor?
Click to expand...
Yes it does. ;)
 
GT-Rx wrote:
guzzi jon wrote:
I'm in for one for my griso, it pops on decel a bunch
cheers
Click to expand...
Thanks Jon, that's more likely fueling related on your Griso with a slip-on muffler. I'm surprised you don't want a PC-V.
Click to expand...

I do want one, but we're buyin a house and the missus watches me pretty close....
 
I've often wondered about the stepper motor and I've read most of the posts. I've a G11 and it's got a slip on. Now it's summer here but I got the bike when it was cooler. When I got the bike the idle would hunt up and down much as you guys have said sometimes it never returned to normal but remained around 2000 at idle. I had the bike serviced and it's never repeated this again. I've never had any popping on decel so I've been wondering about that too?

So, my question is... will my bike likely begin to act as it did when new and cold out or is it more likely it stay much as it is now? I've not had any stepper motor related problems that I can tell...so do most bikes have this issue or do they just differ that much?

If it's likey that when it gets cold the conditions at idle worsen then I should do the mod too...

vivo
 
I've read the initial discussions on this, but 'hooked off' at some point. From what I understand right now, the idea is to be able to stabilise idle by blocking the stepper motor once the engine is warm ... and/or, as someone said, once you're riding?

Todd, I could plug this on my french forum if you like. We'd need a little explicative text (in French), and if you could come up with a schematic diagram or a few pics if you've already got a functional prototype, that'd undoubtedly help (for me too, btw ;) ).
 
vivo wrote:
I've a G11 and it's got a slip on. Now it's summer here but I got the bike when it was cooler. When I got the bike the idle would hunt up and down much as you guys have said sometimes it never returned to normal but remained around 2000 at idle... So, my question is... will my bike likely begin to act as it did when new and cold out or is it more likely it stay much as it is now?
Click to expand...
The erratic idle seems to be more heat related then anything, but the symptoms are as you describe above, and also per above, it helps to plug the "engineered air leak" when tuning or fueling. It also seems to help with pop-on-decel, but the PC-V will eliminate it completely.

RJVB wrote:
I've read the initial discussions on this, but 'hooked off' at some point. From what I understand right now, the idea is to be able to stabilise idle by blocking the stepper motor once the engine is warm ... and/or, as someone said, once you're riding?
Todd, I could plug this on my french forum if you like. We'd need a little explicative text (in French), and if you could come up with a schematic diagram or a few pics if you've already got a functional prototype, that'd undoubtedly help (for me too, btw.
Click to expand...
See above, and I plan on offering a picture of the kit soon, stay tuned. ;)
 
I expected this to be in the same package as the PC-V but hopefully the install won't be difficult.

IF my hand made install works good enough I might consider jumping off this one... :blush:
 
No problem Zapa... teaser pic for the Griso/Breva/Sport 12 bikes, of the toggle switch mount;

StepMtrSw-GrisBrevS12.webp
 
Boy, that's a real teaser, one has to look for that switch! ;)
 
Must have to ask again, because the previous stepper motor thread doesn't give the info I need. I'm down for the kit, but don't fully understand what it does, why Guzzi have it , its physical functioning on the engine, and why it needs to be bypassed temporarily or permanently. I only know a stepper motor provides controlled incremental steps of a valve. What controls the stepper motor, its feedback signal etc. A diagram would go a long way to explain.
Come on you experts, show me the light.
 
Todd,
Know you've been really busy with the PCV, sometime in the next few weeks. i would like to stop by and upgrade my ss suspespension and pick up the stepper motor switch.. It looks like I have some free time finally, hopefully you do.
cheers,
Jon

Edit: Just got marching orders to head off to the UK again, wont be back until early November, hope you're not going to charge me to much storage fee's for holding on to the bits for so long.
Thanks,
Jon
 
Todd
What is the latest with the stepper on/off kits, Unless I missed it I don't recall seeing a step by step PCV/ECU install post for the Norge.

Thanks
 
draidt said:
What is the latest with the stepper on/off kits, Unless I missed it I don't recall seeing a step by step PCV/ECU install post for the Norge.
Click to expand...
Hi Dan, I am shipping the first few today. I'll put a 'Buy Now' link up hopefully tonight.

Breva11/Norge & Sport 1200 PC-V/AT install is linked at the top under Tech -> Fueling.
 
rguzz said:
I'm down for the kit, but don't fully understand what it does, why Guzzi have it , its physical functioning on the engine, and why it needs to be bypassed temporarily or permanently. I only know a stepper motor provides controlled incremental steps of a valve. What controls the stepper motor, its feedback signal etc. A diagram would go a long way to explain.
Click to expand...
The Stepper motor essentially is inline to control idle. Problem is, is even when it's "off" it still bleeds air into the intake manifolds (read engineered air leak, this is the same as drilling a hole in your manifold and leaving it open). Also, as posted above, it is critical in proper throttle body balancing. All of above and erratic idle is cured with this kit.
 
Todd, have you had any issues with cold idle with this kit fitted?
I made one up with a thermal switch fixed to the RH head which does what it's supposed to, but there must be too much restriction in the valve plumbing, as I have to blip the throttle on first start up now.
 
Brian UK said:
Todd, have you had any issues with cold idle with this kit fitted?
Click to expand...
I personally haven't, no... but hopefully a few others will chime in here that have it installed.
 
I installed the Stepper motot kit last week and have had no issues. When I start the bike first thing in the morning with the switch set to use the stepper motor the idle is raised to between 1200 and 1500 rpm. everything seems to work as if the switch wasn't there. When you flip the switch and cut the air off to the stepper motor the idle almost instantly drops to a steady 1000 rpm. The idle is a little rough when the bike is cold and the stepper motor is cut out, but once warmed up runs great without it. It runs fine when cold while using the stepper motor.
 
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