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Author Topic: The Holy Grail - A Mod that pays for itself.  (Read 4726 times)
Speeddog
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« on: May 23, 2012, 08:17:41 PM »
I've been running a '98 M750 for a while as a commuter.

Actual mileage somewhat suspect, as it was purchased salvaged 2 owners ago.
But with the info I've got, it's got no less than 22k on it.

It was obviously running rich, as it never needed any choke to start, and smelled plenty rich to boot.
So, a jet kit was in order.

Got a Factory Pro kit, CRB-D08-1.1-TI, and a set of their Nickel plated emulsion tubes/needle jets, CRZ-EMU-100120K.
All up cost is ~$178, depending on where you're at.

Prior to installation, it had a pretty severe 'sag' as the slides opened, and was generally a bit unhappy with cruising at 35mph or so in the urban flog.
Averaged 40 mpg on a mostly freeway commute.

Installed the kit and the needle jets, noting that the carbs were in decent shape, O-rings and gaskets were good.
Reset the float levels, as they were a bit high.

Immediate impression was a vastly improved quality of running, smooth and linear, no sag, and it actually needed the choke a bit to get it started.
I've only run two tanks of fuel through, but...
It's now getting 52.4 mpg.

At ~$4.40 a gallon here in SoCal, it'll take about 6800 miles for it to pay off.
At my rather high mileage commute, that's about 2.5 months.

Wish I had done it back in January when I started commuting on it, the kit would be paid off and saved over half of the cost of the tires I just bought.
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geoffduc
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18 till i die
« Reply #1 on: May 23, 2012, 08:42:54 PM »
Hey Speeddog just be glad you're in SoCal because over here in the UK gas price is kissing $9 a gallon... bang head

Diesel is even more costly... bang head

And you also have all that beautiful weather... Cry

Geoff... coffee
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« Reply #2 on: May 24, 2012, 05:43:59 AM »
I'll be bringing the wedding present by so you can do the same for moi Wink

Are you going to be around on Monday?
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Speeddog
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« Reply #3 on: May 24, 2012, 07:45:10 AM »
Quote from: bobspapa on May 24, 2012, 05:43:59 AM
I'll be bringing the wedding present by so you can do the same for moi Wink

Are you going to be around on Monday?

Yeppers.

Give me a buzz and we can set a time.

 Smiley
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« Reply #4 on: May 24, 2012, 08:33:10 AM »
Quote from: geoffduc on May 23, 2012, 08:42:54 PM
Hey Speeddog just be glad you're in SoCal because over here in the UK gas price is kissing $9 a gallon... bang head

Diesel is even more costly... bang head

And you also have all that beautiful weather... Cry

Geoff... coffee

Yeah.....The US government <Political commentary redacted-<mod>>
« Last Edit: May 24, 2012, 08:37:46 AM by Speeddog » Logged
JEFF_H
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« Reply #5 on: May 24, 2012, 02:06:13 PM »
i had a similar mpg improvement adding the ca-cycleworks coils on the 97 M750
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ungeheuer
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« Reply #6 on: May 25, 2012, 05:45:36 AM »
Quote from: geoffduc on May 23, 2012, 08:42:54 PM
Hey Speeddog just be glad you're in SoCal because over here in the UK gas price is kissing $9 a gallon... bang head
Yeah but your gallons are bigger than his gallons  Wink

Since we're doing show and tell: 

$6.80/imperial gallon
or
$5.68/US gallon

in my part of the world.
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ducpainter
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DILLIGAF
« Reply #7 on: May 25, 2012, 05:54:09 AM »
yet another reason to avoid Cali...

$3.579 here yesterday.

It is Memorial Day weekend though, so I haven't seen today's price. bang head
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    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
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cokey
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« Reply #8 on: May 25, 2012, 02:26:04 PM »
What's the highest mpg monster? Or one that can be modified easiest for such a feat...   52mpg is great..
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« Reply #9 on: May 25, 2012, 04:23:53 PM »
Quote from: cokey on May 25, 2012, 02:26:04 PM
What's the highest mpg monster? Or one that can be modified easiest for such a feat...   52mpg is great..
my 620 sees numbers like that. Even if I'm beating it, it doesn't seem to drop below 40mpg
Now the KTM  laughingdp , that thing will do close to 50 when going easy but drop somewhere below 30 when you whip it.  cheeky
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ducpainter
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DILLIGAF
« Reply #10 on: May 25, 2012, 04:26:13 PM »
Quote from: cokey on May 25, 2012, 02:26:04 PM
What's the highest mpg monster? Or one that can be modified easiest for such a feat...   52mpg is great..
I have friends that consistently got 60 mpg highway with 620's
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"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”
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« Reply #11 on: May 25, 2012, 04:28:19 PM »
Quote from: ducpainter on May 25, 2012, 04:26:13 PM
I have friends that consistently got 60 mpg highway with 620's
Now that you mention it, I do think I have touched that once or twice.
That would have been if I were behaving though.
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Link
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« Reply #12 on: May 25, 2012, 05:58:37 PM »
Quote from: Link on May 24, 2012, 08:33:10 AM
Yeah.....The US government <Political commentary redacted-<mod>>

Heck, I didn't think it was political....Just a fact that in the US gas costs more then what we actually pay at the pump.
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ducpainter
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DILLIGAF
« Reply #13 on: May 26, 2012, 06:21:30 AM »
Quote from: Link on May 25, 2012, 05:58:37 PM
Heck, I didn't think it was political....Just a fact that in the US gas costs more then what we actually pay at the pump.
So an administrator amends your post because it was political and you post the comment again?

What don't you understand?
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"Once you accept that a child on the autistic spectrum experiences the world in
 a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”
Nomad
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« Reply #14 on: May 26, 2012, 07:30:54 AM »
I've got a '96 M900 with FCR's.  I was getting 43 mpg, when I run ethanol free gas I get 52 mpg.
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