carburetor synchronizing.....done

weedahoe · October 04, 2012, 03:43:39 PM

Well, Ive been going over this bike and todays chore was to synch the carbs. I had already rejetted and cleaned the carbs out. I thought to my myself, the carbs cant be out of wack bad if any because of the low miles on the carbs. Boy was I wrong.

I went through the carb sync threads and was trying to find out to make your own with the fluid and clear hoses but I never could find pics to help guide me. So.....I went to Harbor Freight and bought two vac gauges (93547) so I could dial them in. Even with barely 3k on these carbs, they were out of sync. But when they got in sync, the throttle response was MUCH better.

So for all those guys (and gals) out there who assume they are in sync, check them. You might just be surprised.

Pics and a vid are here

http://sdrv.ms/Wr5Ojr

stokes776 · October 04, 2012, 04:21:52 PM

Awesome Weedahoe!

I am needing to do a carb synch and was reading all these posts about creating your own, but couldnt find explicit directions. Your photos and especially the video help out a lot!

Curious, did those vac guages have the correct size hose or did you have to get a different set?

In the video, I am assuming that is after you have synched them? For this work, it seems like the numbers are not important, more that the needles are moving together properly right?

weedahoe · October 04, 2012, 04:28:32 PM

The hose that came with the gauges were slightly bigger so I just put a worm clamp on it to tighten it while I did the work.

Im not sure the video is working? Can anyone confirm or is it just a picture?

The pic/vid is after they were synched. Its not important what the numbers read as long as they move the same like you said.

One gauge to each vac connection on the carbs is as simple as it can get. I started to make a nice setup to mount the gauges on but since I likely wont be using them for a while, I didnt see the need to over complicate something this simple.

ThatOtherGuy · October 04, 2012, 04:42:13 PM

Glad you posted this I would like to do mine on the GS500 then the Bandit. I'll cut my teeth on the GS500 (2 x carbs) first then try the Bandit (4 x carbs).

Any Aussie members know a good place to get some vacuum gauges?

Ryanstalin · October 04, 2012, 05:38:25 PM

Im kinda curious to how you did that. Im pretty sure my bike needs "everything" but thats good you got that done. nothing like spending some time getting the little stuff done. btw Im downloading the video to compare to the vid of mine running earlier. my carbs seems way off. but it does start and run now.

edit, your bike sounds alot better then mine.

weedahoe · October 04, 2012, 05:56:09 PM

I took each guage and connected each one to each vac port on each carb. Then I started it up and adjusted my idle up and gave it some throttle until I was between 3k-4k and looked at the gauges. Then I turned the sync screw whichever way it needed to go until the gauges ready close to or right at the same. Pretty simple really. I did have to take my carbs off to get better access to the vac ports.

craigs449 · October 05, 2012, 05:15:53 AM

OP, how much were the vacuum guages?

EDIT..NVM.....Here is the link for the guages if anyone is interested...

http://www.harborfreight.com/fuel-pump-and-vacuum-tester-93547.html

weedahoe · October 05, 2012, 06:20:58 AM

Yeah, cheap and simple. Nice little cases for storage until next usage. $15 each wasnt bad IMO and you can always find coupons for 20% off that.

Ryanstalin · October 05, 2012, 06:54:29 AM

do you think mine are way out of sync? actually my engine tends to rev really high when cold.

dry_humor · October 05, 2012, 07:02:40 AM

Quote from: Ryanstalin on October 05, 2012, 06:54:29 AM
do you think mine are way out of sync? actually my engine tends to rev really high when cold.

you wont really know until you check them yourself. a little difference goes a long way when it comes to carb and throttlebody synchronization.

weedahoe · October 05, 2012, 07:03:00 AM

When in doubt, check it out. Never assume anything. Im sure the reality is most guys dont properly maintain their bikes. Im new to bikes and I never knew about carb synching until I got here. So had I not read about it, I never would have done it. I think the chances of this are likely high for other owners/riders also

You can google 20% discount coupons on Google and take a picture of it on your phone and when you check out, show it to them and they will key in the number under the bar code to apply the discount.

Think about it, my engine is an 05 with 2800 miles and they were out of synch a bit. Thats low miles. Imagine where they might be with an older engine with more miles?

craigs449 · October 05, 2012, 08:16:37 AM

my 01 with 21,000 miles surely are out of sync. I gotta do this also

mitch79 · October 05, 2012, 09:34:48 AM

I bit the bullet and bought a Carbtune vacuum gauge a little while ago. Easy to use and no excuse not to do every service. Mine where only a quarter turn out but it sure does make a difference.
Idles smoother and removed the occasional annoying backfire through the carbs I couldn't tune out previously.

gaillarry · October 05, 2012, 03:03:33 PM

I bought these for my KZ750 twin, not cheap, but they work great on my GS500F:

http://www.ascycles.com/detail.aspx?ID=2146

dry_humor · October 05, 2012, 03:55:57 PM

i think a quick google search should lead to some pretty interesting set-ups for home-made sync tools.

usually a yard stick, 2 to 4 even lengths of clear flexible tubing depending on how many carbs/TBs you have (plugged at one end), some sort of oil, and tape to attach the tubes to the yardstick. hook up the open ends to the vacuum ports start up your bike and the oil should rise and fall against the tick marks on the yard stick in the tubes as the vacuum increases/decreases allowing you to synchronize them. make sure you have the EXACT same amount of oil in each tube though.

pretty crude, but it works for some people i suppose.

Suzuki Stevo · October 05, 2012, 04:06:36 PM

Carb-Stix...

ThatOtherGuy · October 05, 2012, 05:48:02 PM

Just saved me a pile of dough, I have everything on hand to make that carb stick. Simple is good.

GI_JO_NATHAN · October 05, 2012, 06:56:10 PM

Good job Mike! I really need to do this, 46k miles and counting, and it's never been done.

I didn't realize you could do this with Vac gauges, that sounds great.
I never had a warm and fuzzy feeling with the tube and fluid rig idea.

weedahoe · October 05, 2012, 07:01:03 PM

That's funny because I started to call you and get some insight from you how to do it....... LoL

Suzuki Stevo · October 05, 2012, 07:06:29 PM

Quote from: GI_JO_NATHAN on October 05, 2012, 06:56:10 PM
Good job Mike! I really need to do this, 46k miles and counting, and it's never been done.

I didn't realize you could do this with Vac gauges, that sounds great.
I never had a warm and fuzzy feeling with the tube and fluid rig idea.

A vacuum gauge will be very stable at 3K-4K, but you set your carb balance at an idle, this is where a fluid rig shines...at the correct RPM, an idle

EDIT: Or just above an idle, I've never gone above 1500 Rpm for carb or TB syncing

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carburetor synchronizing.....done