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Hey guys, I just bought a project RC51 that was an ex track bike. The bike only has 9k on it, and I have gotten it to pretty good working condition at this point, although my bodywork is a bit makeshift.

Afew questions though...

I took it out today for a 3 hour ride. Handled fairly well and the engine is very responsive. I found though that after the bike got up to temp, the idle, which at the beginning of the day was very high at around 1500 to 1700, would start to stutter and jump around, and at the end of the day It would stall right after I started it. Also, I consistently have to give it gas to start it. I'm guessing that it needs a new fuel filter?

The front forks sound and feel like the dont have any oil in them at all, and there is a very very small hose coming out of the front of the bike near the wiring that is just completely open, and I can't help but wonder, if it is a vaccuum hose, where the hell does it lead and why is it up front?

Any answers to these questions would be greatly appreciated. Love the bike, love the power. I've found I can't stay off it, even though my other bike is an 06 r1. I just love the torque of the RC.\

Thanks again for any advice.....
 

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Is the hose on the left side, near the snorkel? It may be the vacuum line going to the flapper actuator.
If the flapper actuator has been removed, then the vacuum lines need to be plugged if the vacuum tank and related hoses have not been removed.
That vacuum leak may be why your bike runs bad and idles high.
Try plugging the hose and check if your bike runs better.
 

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i'll do that. Is it harmful that it has been removed?
Not harmful if removed, only if the vacuum line has not been plugged.

The engine supplies vacuum to a tank that is connected to a solenoid controlled valve.
When the ECU sends the signal to open the valve, the vacuum travels to the flapper actuator to close the flapper valve in the snorkel.

If the flapper actuator is removed, the vacuum line to it must be plugged or the engine will have vacuum leak in the intake.
 
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