Gas Mileage

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26 Jul 2006 16:57 #64980 by Chris1112
Gas Mileage was created by Chris1112
I have a 79-kz 750 twin, and i am only getting 31 miles to the gallon is this normal? If this is not normal does anybody have some suggestions on what to start looking? The bike runs good I ride it to work almost every day, 25 mile round trip.
Thanks Chris

Post edited by: Chris1112, at: 2006/07/26 21:04

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26 Jul 2006 22:43 #65065 by kzmarvo
Replied by kzmarvo on topic Gas Mileage
Sounds about right, how fast do you ride?
Watch it folks,i have sticky fingers when it comes to a nice looking set of handle bars:)

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26 Jul 2006 22:57 #65071 by steell
Replied by steell on topic Gas Mileage
Sheesh, I hammer on them and waste a lot of gas and the worst I get is 45 mpg, with 55 mpg being normal :D

Sounds like it's time for a complete tune up, including adjusting the valve clearances.
KD9JUR

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27 Jul 2006 10:05 #65153 by Chris1112
Replied by Chris1112 on topic Gas Mileage
I pretty much ride at a normal pace 65 to70 on the highway. I have been thinking of doing a complete tune up for awhile now. Is there anything that you all would recommend that I don’t have listed?

Spark plugs
Change Oil
Change Oil Filter
Replace Points
Adjust valves
Clean Carburetors
Dial in the timing

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27 Jul 2006 10:34 #65163 by steell
Replied by steell on topic Gas Mileage
Check the resistance of the coils and spark plug caps, and scour eBay for KZ440 timing advancer/pick up/ignitor to convert your bike to electronic ignition (but I bid on every one listed for a decent price) :D

Post edited by: steell, at: 2006/07/27 13:35
KD9JUR

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27 Jul 2006 11:03 #65173 by Chris1112
Replied by Chris1112 on topic Gas Mileage
steell wrote:

Check the resistance of the coils and spark plug caps, and scour eBay for KZ440 timing advancer/pick up/ignitor to convert your bike to electronic ignition (but I bid on every one listed for a decent price)



Thanks for the advice. I got a question or two.
What’s the benefit of changing the ignition. In addition, are there any good websites that show how to do this? About how much does it cost to do something like this?

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27 Jul 2006 18:43 #65311 by steell
Replied by steell on topic Gas Mileage
It's only about a half hour job to install it, just use the KZ440 wiring diagram on www.kz400.com to see how to wire the ignitor.
I'm working on my third conversion :)

If you can't find an ignitor, loudhvx has a page on building your own using an HEI module from a GM car and three other componets. Costs less than $20 to build it.
KD9JUR

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27 Jul 2006 18:50 #65313 by Biquetoast
Replied by Biquetoast on topic Gas Mileage
steell wrote:

Sheesh, I hammer on them and waste a lot of gas and the worst I get is 45 mpg, with 55 mpg being normal :D

Sounds like it's time for a complete tune up, including adjusting the valve clearances.

Just for the sake of corroboration, the worst I get is 44, and my average is around 48mpg. My entire commute is city and urban though, no highway.

This sounds just like that other dude a few days ago. He ended up having a bad plug wire or cap or something, right? Pretty much running on one cyl?
(1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Sold
kz750twins.com

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27 Jul 2006 21:24 #65369 by agawam
Replied by agawam on topic Gas Mileage
my twin is a shop project so far but I didn't estimate my milage before, just put in gas when it needed it, I have a 74 H1500 that gets about 22mpg but thats a "crank me up" bike

Post edited by: agawam, at: 2006/07/28 00:33
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28 Jul 2006 08:13 #65413 by BARNEYHYPHEN
Replied by BARNEYHYPHEN on topic Gas Mileage
1976 Kz900 bored out to 1024cc, 26's with 135 needle jets, Dyna and WG coil relay rewire. Ride fairly hard. 39.6 mpg.

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29 Jul 2006 10:51 #65665 by 79KZ
Replied by 79KZ on topic Gas Mileage
I must have some problems . I will give the bike a good tune up next weekend. Hopefully that will improve my gas mileage.

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29 Jul 2006 20:16 #65783 by arobsum
Replied by arobsum on topic Gas Mileage
my 1977 kz1000 with vm28's and dyna ignition gets 35-38 mpg. usually around 35.

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