82 KZ750 fuel bowl vent rod

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82 KZ750 fuel bowl vent rod

04 Apr 2019 15:56
#801531
Finally got around to figuring out why the bike I bought last fall was dumping fuel everytime it ran. For some reason it looks like the previous owner soldered around 2 of the vent rods and one was missing entirely. So the question is - where can I get the missing piece and what is it's official name? Only carb service I've done in the past involved putting in the standard kit. Not used to finding missing parts
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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Re: 82 KZ750 fuel bowl vent rod

04 Apr 2019 16:37
#801533
Looking around on ebay it appears that many similar carb bowls have no vent tube. Is it ok to just seal it up?
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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Re: 82 KZ750 fuel bowl vent rod

04 Apr 2019 17:58
#801542
Ok, so from that it seems that just plugging them would be fine.
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 08:51 - 07 Apr 2019 08:51
#801692
Ripped out the remaining tubes and drilled the hole with a centering bit to get a nice conical hole. Filled with steel stik and they work great. Only snag was pinching one of the gaskets whixh resulted in fuel pouring out. Took it all back apart, and now it runs well and is leak free.
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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Last edit: 07 Apr 2019 08:51 by Oldjeep.

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 11:41
#801710
Those are the overflow tubes (not rods). I wouldn't plug them. If your carburetors flood for whatever reason, the excess fuel may get dumped into the engine.



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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 12:03 - 07 Apr 2019 12:06
#801712
martin_csr wrote: Those are the overflow tubes (not rods). I wouldn't plug them. If your carburetors flood for whatever reason, the excess fuel may get dumped into the engine.

Exactly! For example, without those overflow tubes being functional a very simple problem such as a stuck float could turn into a huge problem since the gasoline will have no place to go except into the cylinder. That could even create a hydrolock problem that breaks the engine. Plugging those overflows is not a good idea at all. The folks who designed the carbs did not put them there as decorative items. ;) Ed


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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
Last edit: 07 Apr 2019 12:06 by 650ed.

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 12:29
#801713
The later models dont have them. The excess fuel dumps to the airbox, not the cylinders.
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 13:18
#801718
Maybe. But when the intake valve opens and the piston moves downward the resulting vacuum in the cylinder would suck the fuel into the cylinder - wouldn't it? Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 13:28
#801721
I suppose, but at the point the bike is running then what does it matter? It'll run rich on the cylinder, but it isn't going to hydrolock on a bowl full of fuel. The tank has a vac switch, so the carbs can't be spilling when engine is off.
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 19:12
#801748
Where you careful to make sure not to block the drain plug screw?

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Re: 82 KZ750 fuel bowl vent rod

07 Apr 2019 19:16
#801749
Drain plugs all still work. Steelstik is really thick and hard to jam that far down into a little hole. I checked them all before putting back on bike.
Chuck
81 KZ750 LTD
03 FZ1
www.oldjeep.com

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