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Author Topic: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??  (Read 1578 times)

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Offline b52bombardier1

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Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« on: September 09, 2016, 04:24:38 AM »
Hello,

  I have not done a carb sync on my 72 CB500 bike and I'm finally getting around to buying the sync tool.  But do my carbs need the 5 millimeter brass tubes or the 6 millimeter type to connect the synchronizers? 

  The search function does not work here and the Carb FAQ makes no mention either way.  And the downloadable shop manual doesn't even have a section within the carb area about synchronization. So rather than guess and possibly waste a few bucks plus the time, somebody around here will know the answer.

Many thanks,

Rick
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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline 70CB750

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #1 on: September 09, 2016, 04:37:21 AM »
Take out the screw and measure it.  750 has M5 tubes, yours probably too.
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Offline b52bombardier1

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #2 on: September 09, 2016, 04:48:55 AM »
I'm an idiot.  I have one of those nut / bolt thread size and pitch things in my garage for metric and English nuts and bolts.  I will use it to answer this question and thank you for reminding me . . .

Rick
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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline b52bombardier1

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #3 on: September 09, 2016, 04:57:52 AM »
And a drum roll please, maestro . . . as you predicted . . . it's M5 x .8.  Thank you very much and I can now order the correct tubes.  Now if I only had a brain . . . . ????

Rick
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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline Thekramer666

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #4 on: September 09, 2016, 05:13:49 AM »
Future reference
I just looked up the screw u take out and then I knew
Honda cycle schematics
http://www.cmsnl.com
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Offline b52bombardier1

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #5 on: September 09, 2016, 05:19:38 AM »
Ah yes, another excellent reference. Thank you.  It's been a long week . . .

Rick
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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline 70CB750

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #6 on: September 09, 2016, 05:34:45 AM »
Quote from: b52bombardier1 on September 09, 2016, 04:48:55 AM
I'm an idiot.  I have one of those nut / bolt thread size and pitch things in my garage for metric and English nuts and bolts.  I will use it to answer this question and thank you for reminding me . . .

Rick

Everybody has senior moments:)
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Offline calj737

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #7 on: September 10, 2016, 04:45:53 AM »
Quote from: 70CB750 on September 09, 2016, 05:34:45 AM
Everybody has senior moments:)
Except he's like, 30 so no excuse for him!  ;D
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline b52bombardier1

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #8 on: September 10, 2016, 05:21:03 AM »
I wish I was 30.   I'm as old as my tongue and a little older than my teeth . . . . 57.

Rick
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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline calj737

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Re: Carb Sync Tool - 5 MM or 6 MM Brass Tubes??
« Reply #9 on: September 10, 2016, 05:24:38 AM »
Quote from: b52bombardier1 on September 10, 2016, 05:21:03 AM
I wish I was 30.   I'm as old as my tongue and a little older than my teeth . . . . 57.
Rick
Well then, in deference to your age, see if this helps?
 ;D ;)
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis
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