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TOPIC: Fuel Consumption KZ1000?

Fuel Consumption KZ1000? 12 May 2019 15:24 #803731

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I just did a 110 km (68 miles) ride yesterday, all 2 lane highway, averaging around 115 kph or 71 mph. I filled before and after, so used the opportunity to calculate my fuel consumption. I used 10.15 litres, so that translates to 9.2 l/100km or 30.7 imp mpg or 25.6 US mpg. Seems to me, I used to get around 40 imp mpg mixed city/highway back when I rode it in the '80s. Don't get me wrong, I don't care about the extra fuel used, even at our prices of $1.50 CDN/litre for 91 octane (US$4.23/us gal). I'm just wondering if it's symptomatic of another issue. The engine is stock with the stock airbox (newish air filter) and stock pipes and jets. I had the valves set and the carbs synked around 2,000 kms ago. Am I expecting too much of a 42 year old bike with 70,000 kms on it?
Back in the saddle and loving it! KZ1000A1

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Fuel Consumption KZ1000? 12 May 2019 15:56 #803734

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Seems poor mpg
I get 25 mpg with my turbo 1000 . easily
Dave
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Fuel Consumption KZ1000? 12 May 2019 16:16 #803737

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I get around 40 mpg U.S. what do your plugs look like?
78 KZ1000 A2A

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Fuel Consumption KZ1000? 12 May 2019 16:36 #803739

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bluej58 wrote: I get around 40 mpg U.S. what do your plugs look like?


They tend to be dry and heavily carboned.
Back in the saddle and loving it! KZ1000A1

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Fuel Consumption KZ1000? 12 May 2019 17:42 #803742

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You should be running 87 octane
It sounds like you are running rich, are they all even in color? maybe your choke is hanging up.
The plugs should be light brown.
78 KZ1000 A2A
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Last edit: by bluej58.

Fuel Consumption KZ1000? 12 May 2019 17:45 #803743

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I'm starting to get 40-42 MPG with my 33's. Took a lot of doing. I got 30 +/- before. You should get 40-42 dependable. Checked your timing and spark advance?
Steve
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Fuel Consumption KZ1000? 12 May 2019 20:00 #803752

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bluej58 wrote: You should be running 87 octane
It sounds like you are running rich, are they all even in color? maybe your choke is hanging up.
The plugs should be light brown.


I always used to run 87, but now with ethanol in the regular blends, I thought it would make sense to run 91, which doesn't have ethanol at my pumps. They definitely look rich, but not wet. Perhaps I should run a tank or two with 87, see if it helps and leave the 91 for winter storage. I certainly go through at least 2 tanks a week during riding season.
Back in the saddle and loving it! KZ1000A1

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Fuel Consumption KZ1000? 12 May 2019 20:08 #803753

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SWest wrote: I'm starting to get 40-42 MPG with my 33's. Took a lot of doing. I got 30 +/- before. You should get 40-42 dependable. Checked your timing and spark advance?
Steve


Timing I've done by eye, but not by light. It seems to run well at all ranges of throttle, so I think the spark advance is working ok.
Back in the saddle and loving it! KZ1000A1

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Fuel Consumption KZ1000? 12 May 2019 20:43 #803755

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You need to check both with a light or it's not done.
Steve
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Fuel Consumption KZ1000? 13 May 2019 05:04 #803771

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All the 87 octane around here has ethanol , my bike runs fine on it but the gas never gets old
78 KZ1000 A2A

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Fuel Consumption KZ1000? 13 May 2019 05:38 #803775

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I don't know this for a fact but have read several times that ethanol laced fuel will drop mpg a little. Key word "little".

A compression check may be in order to see how the engine is fairing after all the miles. Lowish compression can result in poor mpg. Other things to check are spark quality, the air filter, and carb jets. If aftermarket carb jets were installed at some time in the bikes life the sizes may be wrong. Replacing the pilots with new Mikuni brand jets would be money well spent.
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Fuel Consumption KZ1000? 13 May 2019 06:20 #803778

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Nessism wrote: I don't know this for a fact but have read several times that ethanol laced fuel will drop mpg a little. Key word "little".

A compression check may be in order to see how the engine is fairing after all the miles. Lowish compression can result in poor mpg. Other things to check are spark quality, the air filter, and carb jets. If aftermarket carb jets were installed at some time in the bikes life the sizes may be wrong. Replacing the pilots with new Mikuni brand jets would be money well spent.


E10 drops your fuel mileage by about 5%. Carb operated motors need to be richened up a little bit when operating on E10. We've had E10 around here for over 25 years, never understood the whole "fuel gets old" nonsense - I store over 100 gallons of E10 per season in boats, snowmobiles, power equipment and seasonal cars. Never had a fuel related issue. Modern fuel comes with all sorts of stabilizers from the pump, so no snake oil needed.
Chuck
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Fuel Consumption KZ1000? 13 May 2019 08:46 #803786

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Wow where do you live? The gas here goes bad in 2 weeks, yes thats right 2 weeks. If I dont use stabilizer my carbs are gummed up in about 20 days. I have seven motorcycles so it turns into quite the chore to have to clean the carbs once a month. If I'm not going to ride for awhile I drain the gas. Gas going bad is a real thing.
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Fuel Consumption KZ1000? 13 May 2019 08:52 #803787

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baldy110 wrote: Wow where do you live? The gas here goes bad in 2 weeks, yes thats right 2 weeks. If I dont use stabilizer my carbs are gummed up in about 20 days. I have seven motorcycles so it turns into quite the chore to have to clean the carbs once a month. If I'm not going to ride for awhile I drain the gas. Gas going bad is a real thing.


Minnesota. Maybe you need to buy your gas somewhere else? I don't drain carbs for the winter - ever
Chuck
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Fuel Consumption KZ1000? 13 May 2019 09:07 #803789

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I usually get about 35mpg with my 1100 shaft.
83 KZ1100A (shaft)
17 Versys X 300 abs
90 Honda CBR600F (brother's)

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Fuel Consumption KZ1000? 13 May 2019 09:09 #803790

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I've experienced a LOT more pilot jets getting clogged with the E10 fuel. My (now departed) GS1000S used to sit quite a bit and the pilots would plug after a few months of inactivity. Stupid me. After beginning the regime of using marine Stabil the problem when away.

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Fuel Consumption KZ1000? 13 May 2019 09:14 #803792

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30 mpg is very poor for highway riding .
That's what I get when the riding hard so i'd seriously consider having a good look in the motor.
I get 50 mpg ( imp gall ) average at around 70 mph with my Z1R and it's not stock.

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Fuel Consumption KZ1000? 13 May 2019 09:41 #803794

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One thing to remember regarding E10. If you have a vehicle that you have been running E0 in forever, the E10 will clog fuel filters, jets and every other little hole in the system. The reason is that the Ethanol is a great fuel system cleaner and flushes all the accumulated crap out of the system fast. Anytime I've bought a vehicle from the southern states I've had to run through a few fuel filters until all the guck is cleaned out of the fuel system. There is also the minor concern that some really old fuel lines are not ethanol safe. If you have any of those then your fuel lines should have been replaced a long time ago.
Chuck
81 KZ750 LTD
03 FZ1
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Fuel Consumption KZ1000? 13 May 2019 16:32 #803834

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One of my bikes is a KLR650 with a big clear plastic tank. I keep in outside under a car port. I notice if I don't cover it up from the sun the gas starts to smell bad in 10 days and it effects the performance of the bike. It will start detonating until i put fresh gas in. I now keep it covered and the gas lasts longer.
And my KZ900 gets 40 mpg at 80 mph.
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Fuel Consumption KZ1000? 14 May 2019 03:36 #803849

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Highway riding I get anything from 50Mpg (Australia gal=4.545ltrs) to a few times sitting on 100 to 110kph most I got was 62mpg, My riding is at times a drag otherwise steady throttle. I have MTC 1075 pistons, mild cams, porting , Marving pipe and ZRX 36 CV's with foam pods, gearing 3,600 at 100kph.
Our previous z900 was also very economical.
First Permanent ride the Z1R since Dec1977 (220,000km) as of June 2015
Second permanent bike 1989 FJ1200 my work horse, growing on me, great bike.
Third ride is now the Frankenstein GPZ1100, now if only I can ride three bikes at once?

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