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Starting a rusty '82 KZ750

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Starting a rusty '82 KZ750 25 Jun 2019 14:20 #806417

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TexasKZ wrote: I suppose that is one way to solve the problem. Perhaps the fsm needs an addendum :silly:


Lol. Anyone know how I can diagnose this backfire?
'80 KZ440D - Stripped for rebuild - kzrider.com/kunena/11-projects/611352-st...ng-a-rusty-80-kz440d
'04 Suzuki DL650 K4 V Strom

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Starting a rusty '82 KZ750 25 Jun 2019 14:44 #806423

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Leak down test (Piston rings and valve to seat seal pressure test).

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Starting a rusty '82 KZ750 26 Jun 2019 07:18 #806481

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Video of bike backfiring while idling .

Backfire at idle
'80 KZ440D - Stripped for rebuild - kzrider.com/kunena/11-projects/611352-st...ng-a-rusty-80-kz440d
'04 Suzuki DL650 K4 V Strom

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Starting a rusty '82 KZ750 26 Jun 2019 07:36 #806483

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Tvag06 wrote: Video of bike backfiring while idling .

Backfire at idle


What happens if you plug that vacuum port that you have hanging open?
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com
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Starting a rusty '82 KZ750 26 Jun 2019 09:45 #806493

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Yep, that´s it. Let´some extra air in and lean out the A/F Ratio = backfiring.
Looks like some more plugs are missing.

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Starting a rusty '82 KZ750 26 Jun 2019 16:20 #806524

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Oldjeep wrote:

Tvag06 wrote: Video of bike backfiring while idling .

Backfire at idle


What happens if you plug that vacuum port that you have hanging open?


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Starting a rusty '82 KZ750 26 Jun 2019 23:31 #806543

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Just making sure your paying attention gentlemen. Yeah... That's it. :blush: B)
'80 KZ440D - Stripped for rebuild - kzrider.com/kunena/11-projects/611352-st...ng-a-rusty-80-kz440d
'04 Suzuki DL650 K4 V Strom

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Starting a rusty '82 KZ750 30 Jun 2019 10:07 #806711

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Ok I sprung for carb sync guages but this looks even less helpful if that is possible. What an I looking at here? Do I need some sort of restrictor in-line to get clean readings?

Carb sync confusion
'80 KZ440D - Stripped for rebuild - kzrider.com/kunena/11-projects/611352-st...ng-a-rusty-80-kz440d
'04 Suzuki DL650 K4 V Strom

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Starting a rusty '82 KZ750 30 Jun 2019 10:34 #806712

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www.amazon.com/d/Motorcycle-Tool-Kits/MO...s-08-0426/B0050CGRDM
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Starting a rusty '82 KZ750 30 Jun 2019 11:34 #806714

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Your vaccum sync gauges need some restrictors to flatten out the vaccum pulsing.
Don´t use the gauges without any restrictor or you will destroy or de-calibrate them.

My sync gauges have adjustable restrictors to minimize the needle shaking.



Some pics of the internal parts of the adjustable restictor mechanism
If you turn the adjuster you qweez the rubber washer and minimize the bore.
bore ID of the spare rubber washer is 0,10 mm !!!




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Starting a rusty '82 KZ750 30 Jun 2019 15:16 #806722

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Nessism wrote: www.amazon.com/d/Motorcycle-Tool-Kits/MO...s-08-0426/B0050CGRDM


Thanks. Where do these mount exactly?
'80 KZ440D - Stripped for rebuild - kzrider.com/kunena/11-projects/611352-st...ng-a-rusty-80-kz440d
'04 Suzuki DL650 K4 V Strom

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Starting a rusty '82 KZ750 30 Jun 2019 15:28 #806723

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Into your rubber vaccum tube right in front of your sync gauge tube connectors.

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