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2021-01-01 Compression and Carb Sync Test 3 years 2 months ago #28537

  • dcarver220b
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Happy New Year I hope..

Prepping the Kz for a test ride. Thought a compression test and Carb sycn test might be in order.

I have a 4-cylinder CarbTune, can't see all six vacuum ports at once. Here's one and two.


Pretty darn close. Remember the Kz has trip-deuce carbs.

Next up 3 and 4.


Hmmm. Not as close. Clueless as to if this is within specs or Oh My God..

The last two, 5 and 6.



High shy of 25, low at 22.8? Thought I'd post this to the peeps on KZ1300.com to see what the experts think.
For now, leaving it as-is.

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2021-01-01 Compression and Carb Sync Test 3 years 2 months ago #28538

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Compression. Number one is an over-acheiver. Retested 1 and 2 to ensure my numbers were repeatable.


Fairing back on, all electrics work! Hi/Lo beam, emergency flashers, all of it is good!

Test ride tomorrow, if it's not too foggy or cold..

Also... ran the ColurTune in all 6 holes and adjusted idle mixture. It helped! Smoother idle, crisper response. But the needles, with exception of #5 cylinder, need be dropped.. Too rich.

And yes, it's cold and I'm outside working in the dark.

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2021-01-01 Compression and Carb Sync Test 3 years 2 months ago #28540

  • Stiggy
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Good to see a proper Mercury manometer in use. I made one over 40 years ago for my z1000. With Mercury from a Kent KU flow recorder(for you instrument guys ) l let a friend borrow it.... never got it back.

If I recall correctly, the spec is 2 cm hg so you are not far away.....unless you are like me...they must be the same.

What are your valve clearances like??
1985 ZG1300 dfi
1977 Z1000 a1 recent purchase, previously owned by myself 1979 ~2000

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2021-01-01 Compression and Carb Sync Test 3 years 2 months ago #28541

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Stiggy wrote: Good to see a proper Mercury manometer in use. I made one over 40 years ago for my z1000. With Mercury from a Kent KU flow recorder(for you instrument guys ) l let a friend borrow it.... never got it back.

If I recall correctly, the spec is 2 cm hg so you are not far away.....unless you are like me...they must be the same.

What are your valve clearances like??


Actually, the Carbtune Pro 4 uses metal rods not Hg. Safer, no chance of engine inhalation, LOL. BTW, my nickname at the Nuke plant is 'Captain Mercury' after I 'skyed' a Wallce and Tiernan FA187 manometer....

Valve clearances should be great, this fresh motor has less than 500 miles on it.

??? If one pair of carbs has a hi and lo reading, which value should be used to sync to the remaining two pairs? Hi value or low value ???

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2021-01-01 Compression and Carb Sync Test 3 years 2 months ago #28542

  • strate6
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The fact is, as you only have 3 adjusters across the 3 twin choke carbs, you cannot adjust each cylinder as an individual, you can only adjust 1 pair at a time.

1&2
3&4
5&6

I too have a set of the Carbtune Pro4 with the metal rod design and find them to be very easy to use and accurate.

Pete F
UK
Why Have Four When You Can Have Six ?

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2021-01-01 Compression and Carb Sync Test 3 years 2 months ago #28543

  • Stiggy
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Funny , we had a captain Mercury at BP Hull in the late 70s. He did something similar... 80 psi on a 0 to 20 psi Mercury manometer. Happy Days.... wasn't you by chance??.. lol.
WRT which value to use from a carb with dissimilar values.... take the mid of the two.
1985 ZG1300 dfi
1977 Z1000 a1 recent purchase, previously owned by myself 1979 ~2000

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