Author Topic: MPG's.  (Read 10356 times)

Offline SaturationDyes

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MPG's.
« on: May 17, 2017, 02:25:43 PM »
So I just rode my bike 900 miles over a two day span. I have never checked the mpgs because I haven't had the bike too long. But on this trip was getting roughly 25-30 mpgs varying each fill up. Now I will say most of these miles were riding in no mans land on Nevada at 80-100mph. I was expecting a little better mileage but also at those speeds not sure if that's pretty standard or not. 

What do you guys think

Offline DC Concours

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Re: MPG's.
« Reply #1 on: May 17, 2017, 02:49:04 PM »
I get 38 in the city. Easy. Yours is not normal.

Offline tweeter55

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Re: MPG's.
« Reply #2 on: May 17, 2017, 03:23:58 PM »
 I usually get 42 to 46 miles per gallon at sane speeds. Read that as 60 to 70 mile an hour.
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Offline SaturationDyes

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Re: MPG's.
« Reply #3 on: May 17, 2017, 03:27:30 PM »
Hmm I wonder what my issue is then. It's has stick coils. Recently cleaned carbs(still need to check their sync). Main jets were 120 I believe. Anyone know where I should start to try and improve this. Bike seems to run great. Starts right up and purrs at idle. 

Offline Summit670

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Re: MPG's.
« Reply #4 on: May 17, 2017, 05:36:42 PM »
If it were me, I would slow down and see what your mileage is. I believe once a person starts exceeding 70-75mph the mpgs go down pretty fast.

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Offline tweeter55

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Re: MPG's.
« Reply #5 on: May 17, 2017, 06:03:23 PM »
Anyone know where I should start to try and improve this.
No doubt if you slow down a little like Summit suggested, mileage will go up.
Here's another suggestion - https://sites.google.com/site/shoodabenengineering/home
Over the years:       1972 Harley Rapido
1972 Suzuki T350R  1979 BMW R100RT
1987 Honda Helix.    2006 Kawasaki Concours

Offline SaturationDyes

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Re: MPG's.
« Reply #6 on: May 17, 2017, 07:18:23 PM »
Tweeter what are you referring to with shoodabeen. I did do probably 100-150 miles at a more reasonable rate and easy accelerating and that was when I got 30mpg. The carbs we filling rebuilt and cleaned not long ago.

Offline tweeter55

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Re: MPG's.
« Reply #7 on: May 17, 2017, 07:46:25 PM »
Steve has basically "written the book" on the Concours, both the C10 and since 2008 the C14. At the very least check out his website and his videos to see what he has to offer. I'm sure others  will chime in also. His aftermarket work on the Concours is extensive.
Over the years:       1972 Harley Rapido
1972 Suzuki T350R  1979 BMW R100RT
1987 Honda Helix.    2006 Kawasaki Concours

Offline SaturationDyes

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Re: MPG's.
« Reply #8 on: May 17, 2017, 07:56:09 PM »
Thanks. I have checked out his site. I have been emailing with him about another issue.

Offline Rick Hall

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Re: MPG's.
« Reply #9 on: May 18, 2017, 01:29:19 AM »
Steve is a straight shooter. He may recommend his paid for services, but he won't complain one iota if you just ask for his advice.

That said, and given I've been here since before Jesus had measles, MPG for the C-10 is generally in the 38-42 mpg range. Less if you have a binary right hand (on-off-on-off-on...).

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Offline Cholla

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Re: MPG's.
« Reply #10 on: May 19, 2017, 01:08:03 PM »
I used to routinely get 47 mpg with bike completely OEM.
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Offline Steve in Sunny Fla

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Re: MPG's.
« Reply #11 on: May 25, 2017, 01:37:35 PM »
running 100 mph...I don't care, you're mileage is gonna suck. It's gonna suck even worse with a large shield. Steve

Offline Daytona_Mike

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Re: MPG's.
« Reply #12 on: May 25, 2017, 08:58:43 PM »
Normal riding I would get 42- 44 and my best ever mileage was 48.8 MPG
When I held my bike at WOT all day at 135mph (no saddle bags or trunk)   I got exactly 20mpg over and over again with the same bike.
Your bike sounds about right.
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Offline Mort Canard

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Re: MPG's.
« Reply #13 on: May 26, 2017, 03:11:42 PM »
Normally running between 70 & 85 I get between 38 & 43 mpg.  Faster speeds do result in lower mpg but I have never got below about 34 mpg.
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Offline Ron Dawg

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Re: MPG's.
« Reply #14 on: May 26, 2017, 03:39:04 PM »
I used to get 42-44 until one day it dropped to 32. Had a fouled plug because the well gasket was leaking and oil fouled the plug. Replaced the gasket and adjusted the valves and it went back up and stayed there. Lose 25% of your power and run the same speed, you get 75% of your gas mileage I guess.
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Offline SaturationDyes

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Re: MPG's.
« Reply #15 on: May 27, 2017, 09:30:18 AM »
I'll check the plugs. Just did 2000miles round trip and got mostly 25-30 mpgs but most of that was at very fast speeds. I did manage to get one fill at 38mpg when I rode through a bunch of construction and towns.

Offline deuce72

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Re: MPG's.
« Reply #16 on: May 27, 2017, 11:46:28 AM »
Ron Dawg I feel is on the right track. My previous bike was getting below normal MPG's and I'm easy on the throttle. Adjusted the valves and found one of them pretty stuck. After the adjustment, MPG's went up to what the bike normally is expected to get.
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Offline Ron Dawg

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Re: MPG's.
« Reply #17 on: May 27, 2017, 12:52:15 PM »
If you adjust the valves, sync the carbs, too afterward. The closer they are, the less she vibrates.
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Offline SaturationDyes

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Re: MPG's.
« Reply #18 on: June 01, 2017, 10:47:01 AM »
I did the valves before I went on the trip. Should I check them again?  Still need to sync carbs tho.

Offline Ron Dawg

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Re: MPG's.
« Reply #19 on: June 01, 2017, 08:02:04 PM »
Probably not. I'd bet you have a well gasket that slipped when reinstalling. They have a big loop that seals the valve cover and well joint and a little one that sits on a pin on the underside of the cover so they stay put while you're messing with putting the cover back on.


 I pinched one "just a little" one time and it leaked "just a little oil" in the plug well from a tiny tear or pinch that I could hardly see and it fouled that plug. After that, I never used the same well gaskets over but once. New ones were cheap insurance to me. But other people say they use them over and over. I'm ham fisted I guess.
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