« previous next »
Pages: [1]   Go Down

Author Topic: Vac Sync questions  (Read 544 times)

0 Members and 1 Guest are viewing this topic.

Offline Duanob

  • Bold Timer
  • Old Timer
  • ******
  • Posts: 4,011
  • Gotcha!
Vac Sync questions
« on: January 07, 2025, 05:23:38 PM »
Memory refresher on syncing carbs, just some final tweaks to make my '76 CB550K road ready:

1 Do I need to sync the carbs if I changed the needle clip position?

2 Does the bike need to be completely warmed up for syncing?

Thanks.
Logged
"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)

Offline bryanj

  • Really Old Timer ...
  • *******
  • Posts: 14,153
  • CB500 Number 1000036
Re: Vac Sync questions
« Reply #1 on: January 07, 2025, 05:56:21 PM »
Yes to both
Logged
Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Duanob

  • Bold Timer
  • Old Timer
  • ******
  • Posts: 4,011
  • Gotcha!
Re: Vac Sync questions
« Reply #2 on: January 08, 2025, 04:26:13 PM »
Thanks man! Now I just need to clear the snow off the drive.
Logged
"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)

Offline dave500

  • Really Old Timer ...
  • *******
  • Posts: 17,054
  • WHAT?no gravy?
Re: Vac Sync questions
« Reply #3 on: January 08, 2025, 11:51:55 PM »
be sure your ignition is perfect first!
Logged

Offline MauiK3

  • A K3 is saved
  • Old Timer
  • ******
  • Posts: 4,406
  • Old guy
Re: Vac Sync questions
« Reply #4 on: January 09, 2025, 06:44:30 AM »
Valves adjusted too.
I synchronize last, after all tune up steps are done.
Bike warm, fan blowing on it from the front.
Logged
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline Stev-o

  • Ain't no
  • Really Old Timer ...
  • *******
  • Posts: 34,472
  • Central Texas
Re: Vac Sync questions
« Reply #5 on: January 09, 2025, 09:15:31 AM »
Quote from: Duanob on January 08, 2025, 04:26:13 PM
Now I just need to clear the snow off the drive.

Quote from: dave500 on January 08, 2025, 11:51:55 PM
be sure your ignition is perfect first!

Good advice!  Set ignition then clear the snow!!
Logged
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Duanob

  • Bold Timer
  • Old Timer
  • ******
  • Posts: 4,011
  • Gotcha!
Re: Vac Sync questions
« Reply #6 on: January 09, 2025, 12:32:54 PM »
Been through everything else. Was running a bit rich so I changed needle clip position by 1 notch. Will do a carb sync and it should be ready for the road.
Logged
"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)

Online denward17

  • Expert
  • ****
  • Posts: 1,486
Re: Vac Sync questions
« Reply #7 on: January 09, 2025, 12:52:23 PM »
Quote from: Duanob on January 09, 2025, 12:32:54 PM
Been through everything else. Was running a bit rich so I changed needle clip position by 1 notch. Will do a carb sync and it should be ready for the road.

Just for posterity, what position did you change to?
Logged

Offline Duanob

  • Bold Timer
  • Old Timer
  • ******
  • Posts: 4,011
  • Gotcha!
Re: Vac Sync questions
« Reply #8 on: January 10, 2025, 03:51:20 PM »
Went from 4th from the top to 3rd or middle slot. It will lower the needle in the needle jet. The bike came with PODs so I'm fiddling with it to get to run the most efficient possible without the OEM intake set up. Also came with a 4 into 1 exhaust. I bought one size bigger main jets, using the OEM size pilot jets. So far it starts good, runs good. It takes a bit for the idle to settle so I think the running rich might cause that. It 's a winter project. The only problem is road testing this time of year. Got more snow today. :/
« Last Edit: January 10, 2025, 03:53:30 PM by Duanob »
Logged
"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
2015 BMW F700GS
Another 1976 CB550K Cafe?

  __o
_- \_<,
(*) /' (*)

Online denward17

  • Expert
  • ****
  • Posts: 1,486
Re: Vac Sync questions
« Reply #9 on: January 10, 2025, 07:33:58 PM »
Quote from: Duanob on January 10, 2025, 03:51:20 PM
Went from 4th from the top to 3rd or middle slot. It will lower the needle in the needle jet. The bike came with PODs so I'm fiddling with it to get to run the most efficient possible without the OEM intake set up. Also came with a 4 into 1 exhaust. I bought one size bigger main jets, using the OEM size pilot jets. So far it starts good, runs good. It takes a bit for the idle to settle so I think the running rich might cause that. It 's a winter project. The only problem is road testing this time of year. Got more snow today. :/

The center position is where I ended up on my '76 550K (stock airbox/stock pipes, stock jets).  If yours is like mine, it will run perfect after it warms up, but I need to use the choke a little more because it is leaner when cold.  Also just a little harder to start cold.
Logged
Pages: [1]   Go Up
« previous next »