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Airbox Connection Help
- Mid life crisis
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I have two 1981 KZ750 (4 cyl). Neither had the airbox installed, and one has pods. I am trying to get one of them back to stock, but I am having a heck of a time trying to figure out all the vacuum lines.
On one, all 4 nipples on the carbs were connected together and then connected to the fuel petcock. On the other, two nipples are capped off and the one goes to the petcock and then the other goes God knows where!
Does anyone have a picture of the airbox with the stock connections? I do not have the ports on the valve cover.
Thanks for any help with this.
Peter
1981 KZ750E2
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- JR
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If ports on the valve cover then you can run a tube from one side to the other and do as above.
Sounds like you have a non US valve cover with no ports. We never got that anti smog stuff up here.
1980 kz750E1, Delkevic exhaust
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- martin_csr
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Does the bike have the Kawasaki clean air system? If so, typically, #1 & #4 are connected to tubing from the clean air stuff, #3 is capped, & #2 has the petcock vacuum line. Without the clean air tubing, you'd cap the unused vac ports. If no vac petcock, cap that port as well.
Note: according to the diagrams for the 81 750E, the carburetor overflow tubing should be routed to the airbox - there are a couple of grommets & Y fittings for making the connections.
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I do not have the ports on the valve cover.
What used to go through that hole at the top centre that has been suggested I block with a bolt? Did one of the vacuum lines go there?
Thanks again for the help.
1981 KZ750E2
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- martin_csr
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The hole at the bottom/front of the airbox is for the crankcase breather tubing - there should be a grommet there. I would connect it to burn the engine fumes. The grommet should be available at the dealer or the auto parts store might have something.
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Thanks again.
1981 KZ750E2
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- Mid life crisis
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What is the reason behind connecting the carb overflow tubes to the airbox? Is that simply to prevent
fuel from dripping onto the engine?
Also, at the very bottom of the airbox there are two holes. One is for a tube to go straight down (I am assuming to drain any fuel that may get into the airbox from those carb drain tubes) and then another one (the one my finger is pointing to). Is that just left open to drain any water that gets into the airbox from the top when the seat is open or something?
Thanks again for all the help.
1981 KZ750E2
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- martin_csr
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As to why the overflow tubing is routed to the airbox, it's probably so that some of the fuel can get burned by the engine as it evaporates? Some models, such as my 81 650, have the overflow tubing routed behind the engine & forward of the swing arm, towards the ground.
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- Mid life crisis
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All the bikes I have ever had just run the overflows to the ground, but your explanation sounds good to me! I guess guess who run pods must direct them to the ground. I will connect them to the airbox to stay stock as possible.
Thanks for the reply.
1981 KZ750E2
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- JR
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Mid life crisis wrote:
All the bikes I have ever had just run the overflows to the ground, but your explanation sounds good to me! I guess guess who run pods must direct them to the ground. I will connect them to the airbox to stay stock as possible.
.
I run the overflows to the ground between engine and swing arm. I just went out and checked and see that I plugged those holes in the air box where the overflows used to go.
1980 kz750E1, Delkevic exhaust
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