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Author Topic: carb balance, where is the vacuum port??  (Read 982 times)
Hoodcounty
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Posts: 17


« on: April 24, 2017, 04:41:18 PM »

Got my DigiSync, tried it on my 2002 Voyager, spectacular results and easy to use.

Now I have the Interstate up on the lift, radiator pods and chrome linkage covers removed.
For the life of me I can't locate the vacuum ports on the carbs.
Are they the ones with the short tubes going to the Air Cutoff valve, right behind the enrichment circuit, or does the tank have to come off this beast?  (of course I just filled the tank 60 miles ago).
Help!!
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The emperor has no clothes
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« Reply #1 on: April 24, 2017, 04:49:40 PM »

No. They are not on the carbs at all. They are on the backside of the intake manifolds.
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Hoodcounty
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Posts: 17


« Reply #2 on: April 24, 2017, 04:55:42 PM »

No. They are not on the carbs at all. They are on the backside of the intake manifolds.

Carb outlet side or carb intake side?
Don't recall seeing anything when I did the O ring service.
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The emperor has no clothes
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Posts: 29945


« Reply #3 on: April 24, 2017, 04:57:45 PM »

No. They are not on the carbs at all. They are on the backside of the intake manifolds.

Carb outlet side or carb intake side?
Don't recall seeing anything when I did the O ring service.
I'll go out to the garage and see if I can get a decent pic. Give me a couple minutes to upload.
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Hoodcounty
Member
*****
Posts: 17


« Reply #4 on: April 24, 2017, 05:01:13 PM »

No. They are not on the carbs at all. They are on the backside of the intake manifolds.

Carb outlet side or carb intake side?
Don't recall seeing anything when I did the O ring service.
I'll go out to the garage and see if I can get a decent pic. Give me a couple minutes to upload.

Thanks.
Found them after your 1st post.

I guess that's why the wife is wearing her "I'm with Stupid " shirt today. uglystupid2
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The emperor has no clothes
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*****
Posts: 29945


« Reply #5 on: April 24, 2017, 05:06:26 PM »

No. They are not on the carbs at all. They are on the backside of the intake manifolds.

Carb outlet side or carb intake side?
Don't recall seeing anything when I did the O ring service.
I'll go out to the garage and see if I can get a decent pic. Give me a couple minutes to upload.

Thanks.
Found them after your 1st post.

I guess that's why the wife is wearing her "I'm with Stupid " shirt today. uglystupid2
Grin no problem  cooldude
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Hoodcounty
Member
*****
Posts: 17


« Reply #6 on: April 25, 2017, 05:00:19 PM »

Ok,
Just finished balancing the Interstate using the Digi Sync.

Went about things a little differently than normal.

Put the bike on the lift, removed all the required parts.

Pulled the spark plug boots on all cylinders once the engine was cold so as to have room for my fat fingers.

Installed the long hoses to the Digi Sync (Q-Tip with just a touch of vaseline on the end of the hose
lets these glide into place). 
I routed the hoses between the carb structure so they came to the port from above and behind, and used one of those 4 fingered flexible pick up tools to set the hoses onto the ports.  this is really the cats behind for making the job easy.

Replaced the spark plug boots.

Fired the engine, put a fan in front of the radiator, and let things get warm.

From the looks of the existing port boots I doubt they had ever been removed so the carbs were as out of sync as I suspected.
Getting things lined up took about 5-7 minutes until everything was +/- 1 on the scale against carb 3.  Checked at 3k rpm, even bettererer. cooldude

Letting things cool at the moment so I'll remove the hoses, re-install all the hard parts removed for the procedure and go enjoy an evening ride on a much more responsive beast.

Having used carb stick in previous years, I could kick myself for procrastinating about buying this tool.  It's fantastic.
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The emperor has no clothes
Member
*****
Posts: 29945


« Reply #7 on: April 25, 2017, 05:27:10 PM »

Ok,
Just finished balancing the Interstate using the Digi Sync.

Went about things a little differently than normal.

Put the bike on the lift, removed all the required parts.

Pulled the spark plug boots on all cylinders once the engine was cold so as to have room for my fat fingers.

Installed the long hoses to the Digi Sync (Q-Tip with just a touch of vaseline on the end of the hose
lets these glide into place). 
I routed the hoses between the carb structure so they came to the port from above and behind, and used one of those 4 fingered flexible pick up tools to set the hoses onto the ports.  this is really the cats behind for making the job easy.

Replaced the spark plug boots.

Fired the engine, put a fan in front of the radiator, and let things get warm.

From the looks of the existing port boots I doubt they had ever been removed so the carbs were as out of sync as I suspected.
Getting things lined up took about 5-7 minutes until everything was +/- 1 on the scale against carb 3.  Checked at 3k rpm, even bettererer. cooldude

Letting things cool at the moment so I'll remove the hoses, re-install all the hard parts removed for the procedure and go enjoy an evening ride on a much more responsive beast.

Having used carb stick in previous years, I could kick myself for procrastinating about buying this tool.  It's fantastic.

I agree, it is fantastic . I am so glad my wife nudged me to get it. We had just spent a bunch of money on a trip to Ireland, then the trip to Inzane . While there and watching Bon demonstrate how to use it, I hemmed and hawed about it. She said "just get it". A little tip about hooking it up. You don't need to remove the plug wires, you don't need to hook up a fan. Just use a long needle nose with a 90* bend on it. The dialing in goes so quick it doesn't come close to overheating.
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