Carb sync all Intruder models

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Lechy
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Carb sync all Intruder models

Postby Lechy » Mon May 02, 2016 8:23 pm

New wrenchers keep asking about carb synch procedures, here is a Youtube video (not mine) of the procedure, it is the same for all models.
The guy uses a Carbtune, but I get just as good results using a simple U-tube manometer, can also be used to synch inline 4's (ask me for more details on how to do 4's if you need to).



My set up. (click the image for a better view, to zoom in, press Ctrl and scroll the mouse-wheel)

Image

Image

Image

Image

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Re: Carb synch all Intruder models

Postby wj_hurd » Thu May 12, 2016 11:10 am

I hate to be a pain in the :moon: ... But can you explain the picts some?

I was thinking of getting one of those meters and getting my carbs dialed in. That or shooting myself in the foot, it might be less painful.
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Lechy
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Re: Carb synch all Intruder models

Postby Lechy » Thu May 12, 2016 11:28 am

It is a simple U-tube manometer which compares the vacuum on both sides. 12' of 4mm clear tubing, a couple of adapters for the vacuum ports available I believe at Harbor Freight. Some light oil , 2T or even cooking oil, if it gets into the carbs it will burn out. You will need about 15" oil on each side, hook it all up, make sure the connections are well fitted and will not draw air, start up the machine, be prepared to hit the kill switch if the carbs are badly out of balance, you will understand if it happens. Start with the idle adjust using the rearmost adjuster on the front carb, to bring the oil level into balance then rev the bike up slowly to around 3K rpm to adjust the running balance using the forward adjuster on the front carb, go back to idle and fine tune. Next is to turn down the idle to a little before stall and adjust the AF settings to achieve a smooth idle on both cylinders, re-adjust the idle to around 1100 rpm and check for balance again. If the system is leak free it is far more accurate than using vacuum gauges. If you can get the levels within 1/2" of balance then you are pretty much spot on.
Hope this helps.

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Re: Carb synch all Intruder models

Postby hurleyfrank » Sun May 22, 2016 5:14 am

thanks for this write-up; i'll have to do this procedure soon (new air filter + new exhaust) and my bike is already lean and out of balance by ear; i'm more than due for it! Hopefully, if i fuck up, one of the mechanics at my workplace will come and save me!
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Re: Carb synch all Intruder models

Postby YoDude » Sun May 22, 2016 8:20 pm

@ Lechy

Off Topic
Hint: Use the 'Direct Link" that postimage offers and you can use the full sized image instead of large thumbnails. If you don't see those the "Direct Link" listed, you're probably using the original postimage site. I'd recommend you move over to the beta postimage site instead. You'll get the "Direct Links" back, though it's a little more involved to deal with (confusing at first) but you'll get used to it.

See my post in the help section.

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Re: Carb sync all Intruder models

Postby Lechy » Mon May 23, 2016 10:37 pm

Yo, some folks have small screens or use pads, posting full size would end up knocking coffee cups off tables or overwhelming the screens on pads. I posted links so that the retrieved image could be spot zoomed for a better look at smaller areas.

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Re: Carb sync all Intruder models

Postby YoDude » Sun Jun 05, 2016 3:19 pm

With that said, I suppose I better go watch some old films I haven't seen in a REALLY long time LOL.

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Re: Carb sync all Intruder models

Postby ClassicfnRD » Mon Jun 19, 2017 1:22 pm

I made my manometer last night. There's more fluid in it than necessary, after all the residual tranny fluid drained down into it..a little bit goes a LONG way when you're filling it up, in case anyone is looking to make their own. I used 25 feet of 7.62 fish tank line and fish tank "air restrictors", and have the same adapters that lechy used that I ordered online (link in the description of the video he posted) since harbor freight is 60+ miles away from me in each direction, and all the parts stores in my town are trash and never have anything I need.

List of materials:
-yard stick
-clear tape
-clear hose (any will do as long as you can make everything fit air tight)
-fish tank air check valves
-Tranny fluid (not mandatory but I had some on hand)
-long 6mm adapters (the longer ones are easier to work with)

Image

Image

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Re: Carb sync all Intruder models

Postby Lechy » Tue Jun 20, 2017 7:56 am

Please let us know how you did with your set up, Good, bad, how did the bike run after you finished.
Watch out for the hose and hot manifolds, had one melt on me the first time I used this set up.
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ClassicfnRD
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Re: Carb sync all Intruder models

Postby ClassicfnRD » Tue Jun 20, 2017 8:12 pm

Lechy wrote:Please let us know how you did with your set up, Good, bad, how did the bike run after you finished.
Watch out for the hose and hot manifolds, had one melt on me the first time I used this set up.
[emoji41]


It's been raining for like 3 weeks here so I haven't been able to use it yet but I do have some spare fuel hose that I can use on the ends if the adapters end up melting the clear line.

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Re: Carb sync all Intruder models

Postby ClassicfnRD » Wed Jun 21, 2017 10:43 pm

Well, I got around to using the manometer today. It works good, but boy are my carbs way screwed up. Front carb was drawing way more vacuum under idle. Got that kind of balanced out, and the bike sounds better at idle, but the rear carb is pulling way more vacuum under throttle no matter how I adjust the throttle sync. I'm thinking the throttle adjustment on the rear carb is fucked, which should be fun....or I've got other issues going on as well. Or both. I didn't really get to spend a whole lot of time on it due to time and weather issues. But yeah, manometer works, so that's a start!

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Re: Carb sync all Intruder models

Postby m2h » Wed Jun 21, 2017 11:56 pm

ClassicfnRD wrote:Well, I got around to using the manometer today. It works good, but boy are my carbs way screwed up. Front carb was drawing way more vacuum under idle. Got that kind of balanced out, and the bike sounds better at idle, but the rear carb is pulling way more vacuum under throttle no matter how I adjust the throttle sync. I'm thinking the throttle adjustment on the rear carb is fucked, which should be fun....or I've got other issues going on as well. Or both. I didn't really get to spend a whole lot of time on it due to time and weather issues. But yeah, manometer works, so that's a start!


Just check the seating of the cable on the rear carb it sits into a recessed hole, if it's on the edge it will cock up your reading bro :cheers: Keep at it it is sure as hell worth the effort when its right. [emoji106]
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Re: Carb sync all Intruder models

Postby Lechy » Thu Jun 22, 2017 4:35 am

Try turning the quadrant on the front carb whilst holding the throttle to around 2500 rpm, see if that effects the balance.
Don't try to get the revs up by using the idle adjusting knob, it don't work that way.
When adjusting the run, if the oil levels are out of balance, dropping to idle will not immediately bring them back again. Always do the adjustment with the throttle open.
It is best to adjust the run by turning the idle down low after balancing then bring the revs up off idle a few hundred with the throttle and do step adjustments up to 3000 rpm.
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Re: Carb sync all Intruder models

Postby oldman_oldbike » Thu Jun 22, 2017 5:41 pm

Hi everyone, new to the site. Just purchased an '86 VS700 and I'm not at all familiar with these bikes. The problem my bike is having is that it is backfiring mainly on the front cyl, but occasionaly on the rear as well just off idle. When taking off, it feels as if it is running on 1 cyl until I twist it open a good ways then it'll take off like a bullet. Would/could syncing and balancing be the issue? I just replaced the plugs and did compression tests on both cyl's and all that is fine. Plugs firing well also. The guy I bought it from just had the carbs removed and completely went through and cleaned up. So I'm thinking that this may be the issue. Has anyone else had this issue? Thanks in advance for any help.

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Re: Carb sync all Intruder models

Postby Lechy » Thu Jun 22, 2017 6:50 pm

First off try adjusting the AF:


Then do a synch.

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