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2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

Thread: Manual fuel petcock question. Reply to Thread
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  Topic Review (Newest First)
09-06-2016 01:28 AM
Ghost Rider
Quote:
Originally Posted by GoMotor View Post
If it were mine, I would want to check the valves at 15,000 while the tank is off anyway no matter how well it starts.
Point taken I should not risk burning up the exhaust valves.

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09-06-2016 12:23 AM
GoMotor
Quote:
Originally Posted by Ghost Rider View Post
If cleaning the carb does not make it start right back up with gusto off comes the valve cover for a check

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If it were mine, I would want to check the valves at 15,000 while the tank is off anyway no matter how well it starts.
09-05-2016 11:55 PM
Ghost Rider
Quote:
Originally Posted by GoMotor View Post
What is your goal? Why did you remove the o-ring and cut the spring in half? The purpose of the vacuum operated valve in the petcock is to stop fuel flow when the engine is stopped. Removing the o-ring removes the seal of the valve and it will no longer work. Cutting the spring reduces the seating force and the valve will no longer work right.

If you wish to disable the valve, the simplest way is to remove the spring so it doesn't push the valve close. I can't see why you would want to do that.
After reading your question again I'm starting to believe you think I put the half a spring back on the side where it belongs. In fact I put it on the side where the o ring came from to make absolutely sure that no sort of a G-Force would move that thing over there whenever I was riding. That's the goal of the spring I was afraid if I stuffed the whole spring in there it would be too much material and whined up damaging something or tearing the diaphragm . Also I don't plan on hooking the vacuum line back up to it I am just going to plug both things that way if the diaphragm does rupture gas will not get sucked into the motor and also it will not leak

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09-05-2016 11:38 PM
Ghost Rider If cleaning the carb does not make it start right back up with gusto off comes the valve cover for a check

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09-05-2016 11:37 PM
Ghost Rider I am currently doing a very thorough carburetor cleaning I'm going to put it all back together and give it a turn. I currently have an old lawn tractor gas tank setup for a fuel system so I can Tinker with it without the gas tank in the way

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09-05-2016 11:36 PM
Ghost Rider I was just saving money on a block off plate I'm having intermittent problems getting it started and I wanted to eliminate everything in the fuel system. I just wanted to be able to disable it without going to the store I was not sure what would happen if I took out the spring and did not put it on the other side. I'm really starting to think that my problem is going to be tight valves considering it has 15000 miles and has never been checked. I have always wanted to disable the vacuum operated petcock anyway I am in the habit of turning off the valve old school. Not too fond of these newfangled shims I might need to used to adjust the valve clearance. Whatever happened to the old set screw and lock nut?

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09-05-2016 11:24 PM
GoMotor
Quote:
Originally Posted by Ghost Rider View Post
Well I thought this was an original idea that I had LOL I also removed the O-ring just in case that's seals off the fuel and I cut the spring in half because I did not think it needed the whole spring so far so good no leaks. I was wondering about just hooking the vacuum line back up if the diaphragm rupture is like you said it would flow fuel into the vacuum line. I guess I will just plug the lines just in case

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What is your goal? Why did you remove the o-ring and cut the spring in half? The purpose of the vacuum operated valve in the petcock is to stop fuel flow when the engine is stopped. Removing the o-ring removes the seal of the valve and it will no longer work. Cutting the spring reduces the seating force and the valve will no longer work right.

If you wish to disable the valve, the simplest way is to remove the spring so it doesn't push the valve close. I can't see why you would want to do that.
09-05-2016 09:32 PM
Damocles And . . . opening the petcock merely fills the float bowl; doesn't administer fuel directly to the engine, as some think. Some stalling, flame-outs, etc., are blamed on the petcock, often innocent and faithfully replenishing float bowl content . . .
09-05-2016 01:59 PM
GoMotor
Quote:
Originally Posted by Ghost Rider View Post
Does anyone know what the vacuum level is supposed to be when cranking I do have a vacuum gauge and I am curious if my problems were related to loss of vacuum. Particularly because I can see other vacuum operated items I have yet to identify up near the front of the motor

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I think if there is enough vacuum to draw air through the carburetor for the engine to run, there is enough to open the petcock.
09-05-2016 11:34 AM
Ghost Rider Does anyone know what the vacuum level is supposed to be when cranking I do have a vacuum gauge and I am curious if my problems were related to loss of vacuum. Particularly because I can see other vacuum operated items I have yet to identify up near the front of the motor

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