'00 M750 running rough

[ducpainter]

I just picked it up while I was pricing water heaters the other day . I did pick up some seafoam today since it was on sale...would that work better?

I've never tried seafoam.

If you saw water in the fuel you drained from the bowls, I'd use a little drygas.

If you don't see water in the float bowl I guess you should consider that you have a different problem.

[junior varsity]

If you don't see water in the float bowl I guess you should consider that you have a different problem.

Indeed. Like the vacuum petcock and the vacuum fuel pump, and the related vacuum lines.

[ducpainter]

Indeed. Like the vacuum petcock and the vacuum fuel pump, and the related vacuum lines.

Pretty coincidental the bike sat in a downpour and suddenly runs like crap....

[junior varsity]

Indeed. I am just thinking about the carb system and where problems seem to be cropping up.

[bdfinally]

Looks like water to me and alot. Wouldn't it be prudent to just lose this tank of fuel and put entirely fresh back in? Also, in draining the bowls again today, I noticed that the left carb drained itself dry in less than a minute, but the right one acted just like a spigot, ran the majority of the pic from it and showed no sign of slowing down until I closed it back up

[ducpainter]

Looks like water to me and alot. Wouldn't it be prudent to just lose this tank of fuel and put entirely fresh back in? Also, in draining the bowls again today, I noticed that the left carb drained itself dry in less than a minute, but the right one acted just like a spigot, ran the majority of the pic from it and showed no sign of slowing down until I closed it back up

Yes, absolutely drain the tank. Add a small amount of dry gas to the tank to get any water that remains.

It sounds like your vacuum petcock has failed. You should replace it with a manual shutoff. Parts Unlimited sells a Pingel copy for short money that works great.

[junior varsity]

I should add that a Motion Pro manual petcock is also dirty cheap. And 5/16" or whatever, just right for our carbonsters.

[ducpainter]

I wonder why they say it's not recommended for over 300cc?

It makes no sense.

[junior varsity]

I decided that was fair game for disregarding. It seemed arbitrary and I could only imagine such limitations could be imposed for placing a petcock in line after a fuel pump, where the pressure would be high (fuel injection?). Seemed like a real non-issue for me, so I decided to grab at it anyhow. Time will tell whether or not it functions properly. There's really nothing to break...

[bdfinally]

Thanks guys

Is this what your talking about AM?

[ducpainter]

Thanks guys

Is this what your talking about AM?

I believe it is.

The one from PU is right angle and has a lever rather than a knob.

I'll see if I can find a pic.

[junior varsity]

Yeah, that's the one I got. The PU one looks purty good too.

http://www.parts-unlimited.com/product/getProductDetails.do?regions=6&segmentId=4&comCodeId=87&subComCodeId=&itemOffset=140&pageSize=20&productId=46723

[bdfinally]

Ok, I'll search around and see which one I can get the quickest. I noticed the motion pro is listed for a 5/8 line and the PU is 1/4. I haven't measured the fuel line, so guess I need to do that before ordering. The other thing is whether to mount it inline before or after the fuel pump.

Another thing I need to think about is how all that water got in there. The bike sits outside all the time and except for winter, I almost never cover it. Usually it has a bit of cover from the house, but not much. Think it's time to check out a new gas cap?

[junior varsity]

5/8" is appropriate. I put mine in before the fuel pump.

[ducpainter]

Ok, I'll search around and see which one I can get the quickest. I noticed the motion pro is listed for a 5/8 line and the PU is 1/4. I haven't measured the fuel line, so guess I need to do that before ordering. The other thing is whether to mount it inline before or after the fuel pump.

Another thing I need to think about is how all that water got in there. The bike sits outside all the time and except for winter, I almost never cover it. Usually it has a bit of cover from the house, but not much. Think it's time to check out a new gas cap?

Check the cap area drain to be sure it isn't blocked, or the hose pinched...

10 bucks says it is.