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My best numbers yet.
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TOPIC: My best numbers yet.
#699649
signalzero (User)
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Gender: Male Location: Hudson Fl Birthdate: 1970-00-00
My best numbers yet. 4 Years, 4 Months ago  
I will try to keep this short. I know the speedometer/odometer on these bikes are a little off but with that in mind here goes. Before I went pumpless I would get anywhere between 165 to 180 miles before I had to switch to reserve and could do another 40 miles or so before I had to stop and fill up. At times it would take a full 5 gallons.

After I went pumpless I would get 125 to 140 miles max before I had to switch to reserve and would head straight to a station to fill up in fear of running out of fuel, well not running out because there was still fuel in the tank but just wouldn't flow. At this point it would only take 3 to 3.5 gallons of fuel.

So I decided to shorten the fuel line a little thinking it might be messing with the gravity feed. I ride to Daytona yesterday for Biketoberfest and the numbers are better then I have ever done before including when I still had the fuel pump. Now keep in mind the last 50 miles or so was low speed higher gear to keep the noise down on the scenic loop and in some of the neighborhoods but I did 210 miles before having to switch to reserve and another 25 miles before I decided not to push it any further. I took 4.5 gallons.
 
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#699652
SKWEARpeg (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
It's always tough to figure out the difference in the way things are plumbed etc., on the internet. I remember when you were working with this, and wondered if you had ever figured out what was causing the issue. It was the one I remembered most, because it didn't make sense. Whether it was not having the cap vented, so it was just the vent through the rollover, or just what, I didn't know. The mileage you got this last time, is exactly what it should be doing. I'm usually 4.1, right at reserve, so running into it a bit, would put you at 4.5.
This is good.
Based on the engineering, the rollover valve should vent well enough, but I think it has some issues. If the caps not vented, and the rollover valve sticks, then you don't get the flow.

Are you running over the manifold now, or under? Is the cap vented? How much line did you remove? I'm under on both mine, and try and keep it as direct as possible. I'm pretty sure Shamrock runs over on all the ones he does.
 
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#699653
dearp (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
Damn that's sweet. Hope I get these results.
 
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#699656
signalzero (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
It is under the manifold, I took about 2 inches off including the old metal fuel line. Cap is not vented as of yet. I am going to do another run the way I normally ride and see how the numbers turn out.
 
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#699657
signalzero (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
The metal fuel line was 3 inches in length.
 
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#699659
pbirk (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
Wow, very impressive IMO. I do hope to bravely go where I've never gone before, into the carb. While reportedly a fairly simple system, I'm the guy who had to take the mover and weed wacker to the other guy to make them run right. I've told myself the worst thing that can happen is I take a box of parts to the shop and ask them to put it back together. Your mileage really makes my 90-110 before flipping to reserve seem despicable.
I hope to improve my mpg this winter, I'm sure I'll be posting as I delve into it.
It reading this type of post that makes me glad to be a lurker of the clinic.
 
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Last Edit: 2013/10/20 10:43 By pbirk. Reason: Added text
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#699660
SKWEARpeg (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
Although removing 5 inches, would certainly make it a more direct route, I think the lack of venting of the cap may cause issues in the future( a repeat of past experience). I think at the very least, I would look at removing the rollover valve, the make up air to the tank has to pass through. You can simply replace it with the correct size of barbed hose connector in plastic or brass, and should be good.
If you trace the vent line where it connects to the front corner of the tank, you'll come to a small plastic dohickey, that is in the line. It's about an inch long, and 3/4 inch diameter. Mine is zip tied to the frame on the left side, below the battery. You can see it if you remove the left side cover.

Rico ran very successfully without venting the cap, for quite awhile, and then when he really never thought he had a problem one damp day on the side of a mountain, he spent some time contemplating the future. He vented the cap, and he hasn't had a repeat. I believe he still has the rollover installed.
The rollover, is the only way the tank gets make up air, to replace the fuel as it drains from the tank. If it sticks shut, then the fuel doesn't flow properly.
 
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#699665
Ricohoc (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
SKWEARpeg wrote:
Although removing 5 inches, would certainly make it a more direct route, I think the lack of venting of the cap may cause issues in the future( a repeat of past experience). I think at the very least, I would look at removing the rollover valve, the make up air to the tank has to pass through. You can simply replace it with the correct size of barbed hose connector in plastic or brass, and should be good.
If you trace the vent line where it connects to the front corner of the tank, you'll come to a small plastic dohickey, that is in the line. It's about an inch long, and 3/4 inch diameter. Mine is zip tied to the frame on the left side, below the battery. You can see it if you remove the left side cover.

Rico ran very successfully without venting the cap, for quite awhile, and then when he really never thought he had a problem one damp day on the side of a mountain, he spent some time contemplating the future. He vented the cap, and he hasn't had a repeat. I believe he still has the rollover installed.
The rollover, is the only way the tank gets make up air, to replace the fuel as it drains from the tank. If it sticks shut, then the fuel doesn't flow properly.


Yes, I have vented the cap, but the rollover is still installed. No problems. And yes, my gas mileage improved considerably. My fuel line is under the manifold.

Had I never tackled any steep grades, I could have probably gotten away without venting the gas cap. But that's what "did in" my pumpless experience. Vented the cap and no problems since, just as you have reported, SKWEARpeg.
 
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#699666
Questcap (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
The short mileage was due to going pumpless, running the petcock on 'run,' rather than reserve, and line maybe being a bit high.

I was having similar issues, running out of gas by 1/4 tank. I rerouted and slightly shortened the line... I still go OVER the manifold, and I cut down the regular fuel feed tube in the petcock by 1/2". All was well.

As further insurance, these days, I run it on reserve at all times, and just refuel when the low-fuel light comes on. 160-180 miles on about 4 gallons is the usual.

On trips I can go 200+ if I'm running 60-65 mph.
 
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#699679
Starship (User)
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Re:My best numbers yet. 4 Years, 4 Months ago  
If you don't feel comfortable staying on reserve (I do and get 180 before fill up and still have another 20 mile as safety)you can shorten the fuel cock stack tube in the tank about an inch which will allow longer millage before needing to go to reserve.
 
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