Metaljockey
Race Dog
For the past two weeks I've been working like a dog to get the bike sorted to my liking.
Yesterday I was able to take it for a test ride with the Touratech tank on. Now there is a problem with the overflow from the OEM tank. Basically the setup works like this; both tanks are conected at their lowest points. Both tanks have breather pipes. Because the OEM's breather exits at a point that is lower than the fuel level in the TT, the TT will drain through into the OEM and out through the breather. To fix this problem, TT supplies a longer breather that is routed over the steering head, the same height as the top of the TT. Now the fuel level is lower than the highest point of the overflow.
When I filled up I filled the OEM first and it was overfilled, then I filled the TT. I have the end of the OEM overflow pipe where I can keep an eye on it and it dribbles fuel while riding. When I close the taps on the TT the drbbling stops. When I open them again, it starts again.
For the fuel to drain through a pipe that is routed higher than the fuel level, just does't make sense to me. Unless maybe the OEM builds pressure from engine heat and starts venting, except it is kept full all the time by the TT and consequently pushes fuel out rather than vapour. Surely it should still equalise with the TT, rather than use the vent?
Yesterday I was able to take it for a test ride with the Touratech tank on. Now there is a problem with the overflow from the OEM tank. Basically the setup works like this; both tanks are conected at their lowest points. Both tanks have breather pipes. Because the OEM's breather exits at a point that is lower than the fuel level in the TT, the TT will drain through into the OEM and out through the breather. To fix this problem, TT supplies a longer breather that is routed over the steering head, the same height as the top of the TT. Now the fuel level is lower than the highest point of the overflow.
When I filled up I filled the OEM first and it was overfilled, then I filled the TT. I have the end of the OEM overflow pipe where I can keep an eye on it and it dribbles fuel while riding. When I close the taps on the TT the drbbling stops. When I open them again, it starts again.
For the fuel to drain through a pipe that is routed higher than the fuel level, just does't make sense to me. Unless maybe the OEM builds pressure from engine heat and starts venting, except it is kept full all the time by the TT and consequently pushes fuel out rather than vapour. Surely it should still equalise with the TT, rather than use the vent?
