Digi Sync by Bon S

[98valk]

Hey Bon S
I have been using the electronic Twin Max. how does your compare?  The TM has a meter that is always bouncing around so u need to take an average. Does your vacuum numbers stay steady?
 ...

I can answer that for you.  They are steady.  There is a little up and down by one or two numbers over time but his digital display has certainly dealt with the bounce.   

Thank you sir.

[pocobubba]

BonS , Great add at the top of the page , good luck and thanks again .

[rbert]

What is the contact info to order a Digi sync? The link does not provide any unless I am just blind.

[The emperor has no clothes]

What is the contact info to order a Digi sync? The link does not provide any unless I am just blind.

1-800-725-6903. It looks like it's by phone or email right now. Or you can PM him. 

[salty1]

What is the contact info to order a Digi sync? The link does not provide any unless I am just blind.

Just open your eyes a little more it's there at the bottom in the red banner. 
http://thedigisync.com/

[Brian]

BonS,

Received mine in the mail yesterday. This unit is awesome, craftsmanship is excellent. I see where you are now an advertiser here. Way to go. Will we see you on Shark Tank in the future? I plan to use this today after the honey-do list is complete.

I will be showing this to the gang at the dealership. 

As a side thought as we like to add gadgets to our bikes I see this being incorporated into a permanent fixture in the future if it can made water proof and have the hoses on the back. Just a thought for those with fairings.

Thank you sir,

[BonS]

BonS,

Received mine in the mail yesterday. This unit is awesome, craftsmanship is excellent. I see where you are now an advertiser here. Way to go. Will we see you on Shark Tank in the future? I plan to use this today after the honey-do list is complete.

I will be showing this to the gang at the dealership. 

As a side thought as we like to add gadgets to our bikes I see this being incorporated into a permanent fixture in the future if it can made water proof and have the hoses on the back. Just a thought for those with fairings.

Thank you sir,

I appreciate it Brian. I'm really happy to put something back into this community as a vendor and to be able to blend my business with my passion - motorcycles!

[Steve K (IA)]

Bon,
Got my Digi Sync in the mail.  Quite the nice looking unit.  Can't wait to use it.  I am one of the lucky ones to have more than one Valkyrie (2).  This is going to be interesting using it for the first time as I know the I/S carbs have never been touched.  My Std., since I am not the original owner, I'm not sure.
Thanks, Steve

[BonS]

Bon,
Got my Digi Sync in the mail.  Quite the nice looking unit.  Can't wait to use it.  I am one of the lucky ones to have more than one Valkyrie (2).  This is going to be interesting using it for the first time as I know the I/S carbs have never been touched.  My Std., since I am not the original owner, I'm not sure.
Thanks, Steve

I'm glad it arrived safely. I've heard it both ways. Some find their carbs just fine others have found them to be out by quite a lot. The histories of our bikes is long and many have passed through other hands before now.

[Brian]

This unit worked great. Finally I bought something that works as advertised, of course all the responses here helped to fortify the claim. I had two carbs out by only 4 points. This unit really made this task quick and easy verses using my homemade unit. With a little tweaking the carbs can be set almost exactly to number 3 without watching and adjusting fish tank valves to minimize needle bounce.

And yep, I hate to admit it, I had the hose from #3 on a different port than I thought it was on. I plan to add numbers to the face of this unit so this old man doesn't get confused again.

Thanks Bon S,

[RDKLL]

Bon S, just paid for it and PM'd you my address....pretty excited!

[WintrSol]

Bon S, just paid for it and PM'd you my address....pretty excited!

Me, too! I can't wait to try it out. The PO said he recently sync'd the carbs, but I think it could be better; something in the rhythm of the engine makes me think it's close, but less than perfect.

[Windrider]

My Digi Sync is paid up and soon-to-be on the way!!  Can't wait to try it out.!!

[ValkISDan]

I always thought I would leave the job of a carb sync up to my mechanic but after watching the video this looks very easy. I think its time to order one of these!

[pancho]

While syncing the carbs this morning, I was thinking how nice that unit that BonS made up would be and that there might be one for me the near future..........  then as I watched the pulsing columns of ATF and considered that one thing (barometric pressure) keeps all six tubes calibrated to each other,,, I decided that it can wait for a bit,, there is something relaxing and old school about a six tube manometer, even if it is  more cumbersome, and certainly not for everyone.. 

Good work and a nice product  BonS,, hope you sell a ton of them, I think you opened up carb syncing to the masses.

[teadream42]

Sent you somePayPal dollars. Looking forward to use the digi sync. Thanks.

[oldfartfrankie]

Now Dang it Bon!
I just got my Digi Sync last week & it's already outdated! It
works GREAT for being so OLD. Version 1 died such a quick
death. Maybe a birth defect?
  Inzane is a little far for me to travel this year, so I'll ship this one back
to ya ASAP!

Oldfartfrankie

[BonS]

Now Dang it Bon!
I just got my Digi Sync last week & it's already outdated! It
works GREAT for being so OLD. Version 1 died such a quick
death. Maybe a birth defect?
  Inzane is a little far for me to travel this year, so I'll ship this one back
to ya ASAP!

Oldfartfrankie

You ship it to me anytime. I'll update it. I'll ship it back to for free. Done.

Regards!

BonS

[8Track]

Hi Bon,

I think your Digisync is great. Just watched the demonstration video and have three questions:

With all 6 cylinders connected to the Digisync, the vacuum line on the petcock will no longer be applying the vacuum required to supply fuel to the carbs. How do you maintain fuel supply whilst syncing?

Does the bike need to be warmed up to operating temperature before the sync?

In the video you conduct the sync at idle. Is there any benefit in doing the sync at higher rpms than idle?

Thanks,

Mark

[BonS]

Hi Bon,

I think your Digisync is great. Just watched the demonstration video and have three questions:

With all 6 cylinders connected to the Digisync, the vacuum line on the petcock will no longer be applying the vacuum required to supply fuel to the carbs. How do you maintain fuel supply whilst syncing?

Does the bike need to be warmed up to operating temperature before the sync?

In the video you conduct the sync at idle. Is there any benefit in doing the sync at higher rpms than idle?

Thanks,

Mark

All great questions!

If you have an OEM or vacuum operated petcock you need to pull a vacuum on the petcock tubing and clamp it while you do your synching. I recommend small vice grips or forceps to pinch off the line. How do you pull a vacuum - I do it with my mouth others have used a mighty vac. I suppose that if you have a leaky diaphragms you may find out - which may not be a bad thing.

Your bike definitely needs to be warmed up prior to synching. I don't believe that you'll get anywhere near as accurate readings if not. Proof? Simply hook up the Digi Sync and take a look at your readings of a cold engine. They're not as consistent and will drift while the engine goes through its warm up. I'm going to do some additional testing on this as well as whether it matters whether your bike is leaning on its side stand versus upright and vertical during the process. If you're setting your idle you definitely want to do this with a warm engine as the rpm's continue to climb as the engine warms up.

Finally, I've read where some believe that bikes with constant velocity, CV, carbs that balancing is only for idle. I don't see where they're coming from on this. I have deliberately set a carburetor out of sync and then run the engine up to around 3500 rpm. The carburetor that was out of sync at idle remained that way at speed. This was a shop test, so I'm going to repeat this test with the bike at actual speed and see if I get a different result. I really don't expect to but I'll let the results speak for itself. The diaphragm simply responds to the butterfly and this and then delivers the correct amount of fuel/air. Synching adjusts the butterflies, to cause each cylinder to draw the same, so it follows that correct synching provides benefits throughout the rpm range as all cylinders are producing power at the same level.

[WintrSol]

Bikes like my VS800 have separate throttle cables and idle speed controls, and you have to adjust the idle sync mechanism separate from the throttle cable length. In the Valkyrie, the throttles are linked so that the throttles are all connected by the same linkage, so no separate throttle sync is needed; you can, however, increase the difference in vacuum between throttles, temporarily, by increasing the rpm, then easing the throttle back down. As the engine rpm drops, the vacuum increases, of course, and small differences between the plates are magnified by the higher air flow.

[EddyH]

Sent your payment by PayPal.

Thanks, Ed

[Windrider]

Hi Bon,

I think your Digisync is great. Just watched the demonstration video and have three questions:

With all 6 cylinders connected to the Digisync, the vacuum line on the petcock will no longer be applying the vacuum required to supply fuel to the carbs. How do you maintain fuel supply whilst syncing?

Does the bike need to be warmed up to operating temperature before the sync?

In the video you conduct the sync at idle. Is there any benefit in doing the sync at higher rpms than idle?

Thanks,

Mark

All great questions!

If you have an OEM or vacuum operated petcock you need to pull a vacuum on the petcock tubing and clamp it while you do your synching. I recommend small vice grips or forceps to pinch off the line. How do you pull a vacuum - I do it with my mouth others have used a mighty vac. I suppose that if you have a leaky diaphragms you may find out - which may not be a bad thing.

Your bike definitely needs to be warmed up prior to synching. I don't believe that you'll get anywhere near as accurate readings if not. Proof? Simply hook up the Digi Sync and take a look at your readings of a cold engine. They're not as consistent and will drift while the engine goes through its warm up. I'm going to do some additional testing on this as well as whether it matters whether your bike is leaning on its side stand versus upright and vertical during the process. If you're setting your idle you definitely want to do this with a warm engine as the rpm's continue to climb as the engine warms up.

Finally, I've read where some believe that bikes with constant velocity, CV, carbs that balancing is only for idle. I don't see where they're coming from on this. I have deliberately set a carburetor out of sync and then run the engine up to around 3500 rpm. The carburetor that was out of sync at idle remained that way at speed. This was a shop test, so I'm going to repeat this test with the bike at actual speed and see if I get a different result. I really don't expect to but I'll let the results speak for itself. The diaphragm simply responds to the butterfly and this and then delivers the correct amount of fuel/air. Synching adjusts the butterflies, to cause each cylinder to draw the same, so it follows that correct synching provides benefits throughout the rpm range as all cylinders are producing power at the same level.

Carl Kulow's Carb Sync section in Shop Talk suggests obtaining the necessary petcock vacuum by starting the engine, clamping the #6 carb vacuum hose and shutting off the engine.  Then hook up the carb sync tool.  The Digi Sync could then be turned on, perform it's self calibration based on ambient air pressure, then restart the engine (vacuum preserved in the previously clamped hose) and proceed with balancing the carburetors.

Advantages:  No need to suck on the hose or buy another tool like mighty vac.

Anyone try this technique with the Digi Sync?

Any reason it would not work with the Digi Sync?

Would appreciate any thoughts since this is a suggestion to possibly improve a procedure I have never yet done myself.

[98valk]

maintaining vacuum will keep the valve open.
I would first make sure there is a tight leak free hose connection at the petcock.
Once vacuum is generated I myself would just put a plug in the hose end that connects to the manifold.

[Willow]

If you find yourself working long enough at synchronizing the carbs to burn all the fuel in the carb bowls you're definitely not using Bon's Digisync unit.   

Clamping the vacuum hose after establishing a vacuum is the common technique but shouldn't truly be needed.

[Windrider]

If you find yourself working long enough at synchronizing the carbs to burn all the fuel in the carb bowls you're definitely not using Bon's Digisync unit.   

Clamping the vacuum hose after establishing a vacuum is the common technique but shouldn't truly be needed.

Thanks!  Looks like this is a non-problem.

[JimT]

Thanks Bon, Great service.  The unit looks every bit as nice as I expected.  Once I put the pieces together I'll try it out. 

JimT

[wiggydotcom]

Hopefully, my digisync is in the ordering process but I have a
couple questions. I know that the radiator fan can affect the synch procedure. Do you then just wait for the fan to shut off if it comes on? And how do the synch readings change when the fan comes on?
Thanks!

[BonS]

Hopefully, my digisync is in the ordering process but I have a
couple questions. I know that the radiator fan can affect the synch procedure. Do you then just wait for the fan to shut off if it comes on? And how do the synch readings change when the fan comes on?
Thanks!

Yes, you'll see the rpm dip when the fan comes on. But in the case of the Digi Sync you can see all six channels at one time so you just keep on synching without concern. That said, if you're setting your idle I'd wait until the fan goes off so you don't end up with a high idle when your fan is usually off.

The issue with the fan and the rpm is when you're working with a gizmo that can't let you see all the channels at one time and you're having to get a reading from the #3 reference cylinder and moving your vacuum gauge around to other cylinders so you're blind to what the vacuum is on #3 when the fan comes on and the vacuum readings change. (I hope that makes sense!)

{{and yes, yours goes out early next week.}}

[WintrSol]

The engine is really hot when the fan comes on, so a small portable fan aimed at it will delay that event by a surprising amount.

[wiggydotcom]

Hopefully, my digisync is in the ordering process but I have a
couple questions. I know that the radiator fan can affect the synch procedure. Do you then just wait for the fan to shut off if it comes on? And how do the synch readings change when the fan comes on?
Thanks!

Yes, you'll see the rpm dip when the fan comes on. But in the case of the Digi Sync you can see all six channels at one time so you just keep on synching without concern. That said, if you're setting your idle I'd wait until the fan goes off so you don't end up with a high idle when your fan is usually off.

The issue with the fan and the rpm is when you're working with a gizmo that can't let you see all the channels at one time and you're having to get a reading from the #3 reference cylinder and moving your vacuum gauge around to other cylinders so you're blind to what the vacuum is on #3 when the fan comes on and the vacuum readings change. (I hope that makes sense!)

{{and yes, yours goes out early next week.}}

Thanks for the explanation, Bon. That makes perfect sense and is another reason to get a near perfect synch with your product. Thanks also for the delivery update!

[wiggydotcom]

The engine is really hot when the fan comes on, so a small portable fan aimed at it will delay that event by a surprising amount.

Good point, WintrSol. I used to do that but it probably isnt necessary anymore.

[Windrider]

Hi BonS,

My Digi Sync arrived this morning, read up on it and headed for the garage after lunch.  Beautiful unit and as other have said it works as advertised.  I'm delighted!!  Top notch product.

My bike has seemed very smooth to me and I have been trying to squeeze higher gas mileage out of it.  I've ridden about 1600 miles so far this year.  Average MPG 33.8.  Had it 10 yrs and it usually averages 32 MPG.  It was last serviced by the Honda dealer 8/2014 and I think synced then.

Per the Digi Sync the worst carb was off about 8 counts, so well within acceptable limits per Honda specs.

I was very pleased to get my carbs within a count or two of each other.  It's very accurate.  Test ride of 20 miles felt smoother than before.

THANKS VERY MUCH!!!   -- Windrider

PS:  I tinkered long enough for my fan to come on, but I was nearly done anyway.  Idle dropped as you've described.

[Bambam650]

If anyone with a Digi Sync in the Cincinnati area wants to recoup some money on their purchase, please PM me.

[The emperor has no clothes]

If anyone with a Digi Sync in the Cincinnati area wants to recoup some money on their purchase, please PM me.

Along those lines. I know BigBF is doing this at Inzane . Does anybody know if he's going to be using BonS's unit this year ? And an approximate price ?

[Steve K (IA)]

Question for Bon or someone who has used the Digi Sync.  Are the hoses in direct relation to the read out numbers.  Does the top set of hoses from left to right correspond with the top row of numbers?
So if you stood on the left side of the bike holding the tool so that you can read it, hooking up the top row of hoses to the right side of the engine front to back, the middle hose connects to #3?
Hope this isn't too stupid of question.   

[wiggydotcom]

Question for Bon or someone who has used the Digi Sync.  Are the hoses in direct relation to the read out numbers.  Does the top set of hoses from left to right correspond with the top row of numbers?
So if you stood on the left side of the bike holding the tool so that you can read it, hooking up the top row of hoses to the right side of the engine front to back, the middle hose connects to #3?
Hope this isn't too stupid of question.   

It would depend on how you hooked them up, Steve. Isn't the right side 1,3,5 and the left side 2,4,6 front to back? Go from there on how you'd want them to read.

[BonS]

Question for Bon or someone who has used the Digi Sync.  Are the hoses in direct relation to the read out numbers.  Does the top set of hoses from left to right correspond with the top row of numbers?
So if you stood on the left side of the bike holding the tool so that you can read it, hooking up the top row of hoses to the right side of the engine front to back, the middle hose connects to #3?
Hope this isn't too stupid of question.   

That's right Steve, each number on the display is nearest it's hose. I usually hook the top center hose to the #3 cylinder. And wiggydotcom is correct in that you can hook them up as you like.

[Steve K (IA)]

Thanks guys.  I kinda assumed that...but you know what happens when you assume too much.  Just thought I'd better check.   

[cogsman]

My DigiSync arrived today! What an awesomely designed piece of equipment, expertly packaged.

Honestly, I was expecting it to look more "hobby-grade". But this is 100% retail-grade stuff!!! Can't wait to try it.

Bon, I'm amazed at your mad engineering skillz!