hey y'all so i've been looking around for info in regards to fuel flow and requirements as i've been tuning my bike in readiness for recent modifications
i recently installed my new Graves velocity stacks on my 2009 R1 and wanted to make sure my current maps are able to adjust fueling via auto-tune accurately!
i did some research through friends n' the R1-forum & found a thread previously started by an FZ1 forum member back in the day!! so here it is!!
if you are having issues with your sportbike running hot, surges / lag in power randomly and all around unhappy bike... take a look at your fuel line!
most sportbikes have the fuel pump attached right under the fuel tank (obviously) as there is little room for all that shite, well Yamaha decided to stick a rigid plastic EFI
hose from the fuel pump to the primary fuel rails... now if you've ever worked on your bike and lifted the tank you may not have been aware of how cramped things are
under there and chances are you have managed to bend or even kink your fuel line hose!! to make matters worse, you will not be able to inspect it with the blind eye
as these rigid rubber hoses are covered the fool length by a soft rubber hosing!!! mine had a kink at the 90 degree bend right by the fuel pump connector, its very
common and it was readily visible once i cut the surrounding hose off... yuck... it was squeezed! not good for fuel flow!
here's the solution, its a $14 mod!! i picked up a Prestone 1/4th inch ID EFI hose from O'Reilly autoparts in wa state, its an 18" EFI (electronic fuel injection) hose,
also picked up EFI clamps from lordco (for some reason my local lordco didnt even have EFI hoses!! wtf!)
you will need to cut out the old hose from the quick release connectors, be careful not to cut the connectors themselves, use an exacto-knife, feel with your fingers
where the connector ends, leave an inch of space (safety) and cut the connectors off the ends of the oem hose, this will allow you to have hose left over to start
cutting length wise... its very easy and gives a clean cut... the Inner diameter of the new hose is very small and it will be a tight fit on the new connectors, use soapy
water on the connectors n' slide/twist/push the new hose over it... clamp down with your EFI clamps (these will likely be tight, you need to play with 'em to fit properly...)
here are the results,
new hose and clamps (lordco has these individually! best if you take your hose in with the connectors for sizing as mine were a tiny bit smaller than required)
i routed the new line back and around the hoses/ electrical connection from the fuel pump so its a nice damn nearly perfect circle from fuel pump to the fuel rail...
this will allow the hose to sit flat under the tank when you button her back up!! and YES i have already seen temperatures drop a good 15 degrees on avg!!
better fuel flow, better fuel mapping, cooler running bike due to better fuel flow/consistency! more accurate fuel consumption and longer lasting fuel pump!, priceless!!