Two fuel tap question

rancheroracer · May 16, 2005

Guys, I've been reading the threads about running with both taps open. Maybe this question is stupid, but realize this is my first 'Berg. Why couldn't one run with one tap open, then when/if bike runs low on fuel, shut that tap & open the other one? How would the carb know the difference since it's gravity fed from the same height? I'm talking about trail riding, not wide open throttle, although it seems one tap would supply enough fuel even wide open.

schwim · May 16, 2005

tappy tappy

can I ask what you think this would accomplish for you? Both taps, or one tap, you're going to run out when you run out

If you're thinking that you'd use the second side as a reserve, why not just use the built in reserve? People have said that it doesn't work, but it got me out of the woods

We had to replace the tap on Charles' KTM(single tap), and when I looked between his and mine, it seems to be identical in every way. Same length to the top of the screen, same rotating configuration. His reserve works as well on his.

Are there different taps out there?

thanks,
json

rancheroracer · May 16, 2005

Re: tappy tappy

schwim said:
If you're thinking that you'd use the second side as a reserve, why not just use the built in reserve? People have said that it doesn't work, but it got me out of the woods

thanks,
json

That's interesting, reserve port must be a little higher even without a tube?

Jocke_D · May 16, 2005

When I'm not at a track where I am close to the wxtra fuel I always use the right tap as a reserve. It have helped me to the nearest gasstation lots of times.
Bear in mind that now I'm talking about riding the country roads or in town where there can be a long way to go to get refueled. You get more mileage from the right side of the tank than from the built-in rezerve.

BundyBear · May 17, 2005

Re: tappy tappy

schwim said:
can I ask what you think this would accomplish for you? Both taps, or one tap, you're going to run out when you run out

If you use the bike for lots of short trips (eg riding to work), where you don't check the fuel level & fill up each trip, the reserve is invaluable to know when to fill er up.

It is also embarrassing to turn it onto reserve after it stops, only to find that reserve doesn't actually exist!

Seems some do & some don't have reserve on the fuel ****.

Maddel · May 17, 2005

I'm a little confused now.... :shock:
My '02 FS650 has no built in reserve
(no drivepipe on none of the fuel taps).
May be I din't get the thread right

but
it seems there are differences between
models and year of manufacture.

Running with only one tap open makes
my bike stall beginning at midrange revs.
(SM riding with abrupt throttle rise).
I always avoid discussions about fuel
consumption with my buddys :lol:

Taffy · May 17, 2005

they don't have resereve i'm afraid. none of them do otherwise the central tube required would be listed in the parts book wouldn't it....

what's happened is that having stalled it and run out of fuel, somebody has moved the tap, wobbled the bike 10 times and then it's good for about 200 yards i reckon.

to make a reserve; the basics are on the owners doc and it's credited to fontana who came up with it.

the other way, as said, is to leave the left tap in the OFF position and what with the splish and the splash the tank will run dry on the right and WILL stall the bike. you then turn the left tap on and you know you have about 1 pint of fuel left.

regards

Taffy

ClarkKent · May 18, 2005

Ditto to Taff - always have, always will leave one shut. I don't believe it effects performance of trail riding at all. As to Jason's comment that when you "run out you run out" - at least when you run out on one side you get prior warning that you haven't got long before you run out and you should make sure there's more of your mates behind you rather than in front. (ie you can flog more fuel from more riders) This lesson was learnt years ago when I left both taps on and was last to leave at a stop - which meant I waited along time before someone came back to find me. :lol:

deekay · Jun 28, 2005

If you guys are so worried about running out of gas...carry a liter oil bottle with spare cas bungied up in that nice little spot under the seat. Several Berg owners I know do that in Colorado where you can NEVER have enough fuel.

aloha,

deekay

Simon · Jun 29, 2005

Hello chaps,

In addition to what's already been said, the purpose of 2 taps is also to ensure that there is sufficient fuel flow to the carbs when on full throttle.

I personally haven't tested the max flow rate of the berg taps but on many occasions on other bikes the flow capability of the fuel taps can become the limiting factor in fuel delivery, thus performance.

Cheers,
Simon

Taffy · Jun 29, 2005

not here simon. each tap could sell you a pint in 30 seconds.

regards

taffy

benk · Jul 1, 2005

rancheroracer said:
Guys, I've been reading the threads about running with both taps open. Maybe this question is stupid, but realize this is my first 'Berg. Why couldn't one run with one tap open, then when/if bike runs low on fuel, shut that tap & open the other one? How would the carb know the difference since it's gravity fed from the same height? I'm talking about trail riding, not wide open throttle, although it seems one tap would supply enough fuel even wide open.

have tried it in the past but when trail riding with some effort, the "reserve" fuel almost always ends up being used by the tap that remains open and reserve achieves no better than reducing your walk by a km or two.
to affect a real reserve both taps must be replaced with KTM items or similar (with reserve tubes)

Taffy · Jul 1, 2005

or read fontana302's article on how to do it. i have a very short description on it in the owners doc. i've also done it but never use it!

regards

Taffy

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