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 Post subject: Tips for improving MPG
PostPosted: Mon May 07, 2018 12:58 pm 
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On the street

Joined: Thu Jun 25, 2015 8:47 am
Posts: 22
Country: USA
Bikes owned: 1974 T500 Titan
I have the brand new Mikuni VM32 carbs on my 74 T500 (VM32-193, VM32-33) and they fuel great! Bike runs strong all over, pulls over 100mph, no flat spots or hesitations and idles perfectly. Granted this took a lot of tinkering, but it works now!

Here is my issue. It only gets like 27mpg... 3.5 gallon tank means no long days in the saddle without many stops.

I replaced the wheel bearings, no change. Brakes are not dragging, clutch is rock solid, I am running pod filters only because these new carbs have bigger inlets and the stock airbox rubber won't fit.

I feel like I am a little ham-handed and get in the throttle a lot when riding it, but I mostly see people posting about getting 50mpg on these bikes. Is riding it fast going to cut the MPG almost in half??

Am I just gonna have to get used to stopping for gas or are there some potential fixes??


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PostPosted: Mon May 07, 2018 1:56 pm 
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On the street

Joined: Sun Feb 26, 2017 7:52 am
Posts: 24
Country: yu
Bikes owned: t500, kz400,bsa b175
Hi, any chance you could share what configuration of jets needle etc. you ended up with on the new Mikunis?
I was thinking of giving them a try.


Hope you get an answer to the mpg, but mine drinks the juice too if I hammer it.
Thanks
Ross


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PostPosted: Mon May 07, 2018 3:17 pm 
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On the main road

Joined: Sat Sep 05, 2015 3:14 pm
Posts: 133
Location: southeast pa
Country: us
Bikes owned: GT
hubskadub wrote:
but I mostly see people posting about getting 50mpg on these bikes

On my 75 T500 I get around 35 mpg, On my 76 GT500 I get around 40 mpg. Both are stock setups and my riding style is easy on the throttle, If you start cranking the throttle open the mpg starts dropping fast.

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


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PostPosted: Tue May 08, 2018 1:00 am 
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Expert racer

Joined: Mon Dec 01, 2008 2:52 am
Posts: 1153
Location: Manchester, UK
As said above, any big 2-stroke will make the juice magically disappear if you're working them hard, it's one of their party tricks :wth: :lol:

Also the T500 always drank more juice than the GT500: the GT500 had a number of detail changes which reduced peak power, lowered the torque peak and were intended to improve economy.

I converted your mpg figure to UK miles per gallon (I can't work with your 16oz pints, a pint should have 20oz, dammit :wink: ) and it's around 34mpg, which I think is OK for a modified bike.

If the spark plug colours look good then I would suggest leaving it alone, and simply refuelling every 80 miles or so (I usually need to empty my personal tank at about 80 miles, anyway :roll: ). Fuel is cheap, fixing holed / seized pistons from going too lean on the jetting is expensive ...

And by the way, she looks like a very nice bike indeed. Enjoy!

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1976 GT380 - wounded by me, and sold on
2006 SV650S. It's got cams, and valves, and stuff


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PostPosted: Tue May 08, 2018 11:46 am 
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To the on ramp

Joined: Wed Jul 18, 2012 10:46 am
Posts: 229
Location: Eastbourne
Country: United Kingdom
Bikes owned: T500J
Craig - note the US fl oz is smaller than the UK one, not sure if you're aware - apologise if you are
I get a comfortable 150 miles per tank before I have to switch to reserve so maybe I'm a but delicate on the throttle


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PostPosted: Tue May 08, 2018 12:06 pm 
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Road race school

Joined: Wed Jul 10, 2013 12:04 pm
Posts: 810
Country: England, UK
Bikes owned: FZ50, GP100, RG125 Gamma, GT380, Bandit 1200S
My old man had a KH250 that did 22mpg (UK) at best on pod filters and micron pipes.
It's something you'll have to put up with I think.
You may find your economy, and even performance, improves a little if you can find a way of putting a standard airbox back on it.


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PostPosted: Tue May 08, 2018 5:21 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2151
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
If you buy fuel in Imperial gallons, rather than US ones, you will see an immediate 18% increase in 'gas mileage'.

Another option would be to get your weight below 150 lbs as most of us did when we were 21 years old back in the 70s.......

Failing all that, adjust the brakes, don't race anyone, keep the revs below 4000 and the fuel mileage will be much better.

Or bearing in mind that in the UK, our fuel is over (equivalent) $8 a gallon, stop complaining and enjoy the bike for what it is. Cheaper option is walking or public transport, you fancy that?

My GT550 can get 50 mpg+ if I keep below 50 mph and small throttle openings, or 20mpg if I spank it. I know what's more fun. Sod fuel cost.
How old are you FFS?


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PostPosted: Wed May 09, 2018 1:07 am 
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Joined: Mon Dec 01, 2008 2:52 am
Posts: 1153
Location: Manchester, UK
tricky1962 wrote:
Craig - note the US fl oz is smaller than the UK one, not sure if you're aware - apologise if you are


It's the other way around - a US fl oz is just over 1ml (or about 3%) more than a UK fl oz, but a US pint is 16fl oz = 473ml rather than our 568ml ... so we always get more miles per gallon :wth: :lol:

_________________
1976 GT380 - wounded by me, and sold on
2006 SV650S. It's got cams, and valves, and stuff


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PostPosted: Wed May 09, 2018 7:17 am 
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On the street

Joined: Thu Jun 25, 2015 8:47 am
Posts: 22
Country: USA
Bikes owned: 1974 T500 Titan
It's not really about fuel cost, more about being able to pass a few gas stations on a day ride... I will do a few rides keeping the revs down and see what the result is.

I'm no spring chicken BTW. I will be 45 in 2 weeks and I have been riding since I was 18.


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PostPosted: Wed May 09, 2018 1:41 pm 
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On the main road
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Joined: Mon Jun 12, 2017 12:01 pm
Posts: 191
Location: Galveston County, Tx.
Country: USA
Bikes owned: '75 T500M since '93 Ridden it over 100,000 mi
hubskadub wrote:
....I will be 45 in 2 weeks...........
aahhh, 45....Image...I remember when I was 45.....kinda. :roll:




I don't get any better than around 30 MPG but I don't keep '75 T500 tuned up as often as I should.

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GONE.......WITH A PUFF OF SMOKE AND A BLUR OF SPOKE


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PostPosted: Wed May 09, 2018 2:26 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2151
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
hubskadub wrote:
It's not really about fuel cost, more about being able to pass a few gas stations on a day ride... I will do a few rides keeping the revs down and see what the result is.

I'm no spring chicken BTW. I will be 45 in 2 weeks and I have been riding since I was 18.


It's nice to stop for the occasional coffee and 'P' anyway.
As far as the spring chicken goes, I bought my first GT550J back in 1972 as a 21st birthday present to myself.
I now have four - sold one last year - one running, one in resto and 'spares', plus a GT750B and a GSX1400 for times when I need a bit more.......


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PostPosted: Wed May 09, 2018 3:06 pm 
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To the on ramp

Joined: Wed Jul 18, 2012 10:46 am
Posts: 229
Location: Eastbourne
Country: United Kingdom
Bikes owned: T500J
Craig380 wrote:
tricky1962 wrote:
Craig - note the US fl oz is smaller than the UK one, not sure if you're aware - apologise if you are


It's the other way around - a US fl oz is just over 1ml (or about 3%) more than a UK fl oz, but a US pint is 16fl oz = 473ml rather than our 568ml ... so we always get more miles per gallon :wth: :lol:



Cheers - I got that wrong then!


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PostPosted: Wed May 09, 2018 6:24 pm 
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Novice racer
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Joined: Wed Jan 18, 2012 8:01 pm
Posts: 930
Location: North of Albany, NY
Country: USA
Bikes owned: T500R (now), T500M (30 yrs ago)
dorT500 wrote:
hubskadub wrote:
....I will be 45 in 2 weeks...........
aahhh, 45....Image...I remember when I was 45.....kinda. :roll:


Who are you kidding? You have a hard enough time remembering the two weeks. :lol:


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PostPosted: Wed May 09, 2018 6:44 pm 
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On the main road
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Joined: Mon Jun 12, 2017 12:01 pm
Posts: 191
Location: Galveston County, Tx.
Country: USA
Bikes owned: '75 T500M since '93 Ridden it over 100,000 mi
ConnerVT wrote:
dorT500 wrote:
hubskadub wrote:
....I will be 45 in 2 weeks...........
aahhh, 45....Image...I remember when I was 45.....kinda. :roll:


Who are you kidding? You have a hard enough time remembering the two weeks. :lol:
:? What kind of misconception are you under this time?

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GONE.......WITH A PUFF OF SMOKE AND A BLUR OF SPOKE


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PostPosted: Fri May 11, 2018 1:02 pm 
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On the street

Joined: Thu Jun 25, 2015 8:47 am
Posts: 22
Country: USA
Bikes owned: 1974 T500 Titan
ro55o wrote:
Hi, any chance you could share what configuration of jets needle etc. you ended up with on the new Mikunis?
I was thinking of giving them a try.


Hope you get an answer to the mpg, but mine drinks the juice too if I hammer it.
Thanks
Ross



I got the stock T500 rebuild kits for the stock carbs and put everything in as normal if I am not mistaken... They are essentially the same carb as back in the 70's, just the body is bigger and there are more vents.

The fit is tight since the bodies are bigger. The left carb sits right on the case. You have to use the early T500 short intakes for them to fit and you will have to run pod filters.

Only tweaks I think I had the hardest time with was getting the idle right and the air screws so it revs good.


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