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Discussion Starter · #1 ·
I've posted before about a device for tuning 4 carbs on the Kawasaki GPz 750.
You may recall the 'Carb syc tool' ? 'Bluetooth' and all that.
So I was testing the device out and these are the readings I got from the bike while cranking it over for 15 seconds.
See the pictures for the set-up and the vacuum plots vs time.
Comments welcome.
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Discussion Starter · #3 ·
Some further info. The last graph is after adjusting the throttle screws for 3rd time. You can notice that engine is at 540 rpm while cranking over. The lowest vacuum recorded is 441 hPa (15.805 inHg vacuum or 401 mmHg vacuum).
By the way:
The Haynes shop manual says that I should see 22 cmHg vacuum while running at 1100 rpm.
And, the maximum difference between cylinders should not exceed 2 cmHg.
So, 220 mmHg vacuum VS 401 mmHg vacuum (450 hPa) and 20 mmHg difference.
This is what I got:
Range:
cyl to cyl
1 to 2 = 3 hPa, 2.25 mmHg
2 to 3 = 17 hPa, 12.7 mmHg
3 to 4 = 30 hPa, 22.5 mmHg
1 to 4 = 9 hPa, 6.7 mmHg
2 to 4 = 13 hPa, 9.7 mmHg
Cylinder 3/carb 3 has no individual adjustment screw, so the other cylinders are ‘relative’ to Cylinder 3.
That's all for now. Waiting for warmer weather to run the bike again.
 
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