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Bike loses fuel riding up steep hill?

  • Thread starter Thread starter rockhammer
  • Start date Start date
R

rockhammer

Guest
Hello

I recently finished quite a bit of maintenance work on my gs 850. The bike runs great. Smooth, more power, really a night a day difference. However before the maintenance the bike would die riding up a certain steep hill. I figured once I was done with the list of maintenance items that would have gone away. Well yesterday I was riding up that hill and it still died. The maintenance I did is this.

Valve clearance, carb jets clean with out a total rebuild and the carbs were spotless when I took them partially apart to clean three jets and the air intake jet. New boots and rings, New gaskets valve cover, breather gasket, crank case, clutch cover, new boots to air box. Air box completely sealed, new air filter oiled just right. New hoses on carbs. This seems like a fuel flow issue. I have a new petcock here and ready to install that.

Any idea what this might be? Has any here every heard of any thing like this happening? Any input would be appreciated.
 
fuel level in the tank, or is it full, half full, your not running on reserve are you ?

just covering the basics....

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Why have you got a new petcock? The answer is in the question? Does it happen on PRIme?

Assuming it dies slow and not just cuts out (which would send me looking for a loose battery) it points to fuel flow. Suppose there is a foreign something in the tank that clogs the petcock.
You might spot it if you free off the tank and raise the front, idling on the mainstand although the flow might need to be higher to make the restriction apparent. You could run a hose from the petcock to a graduated bucket and stopwatch and see what happens when you raise the tank.
 
Before you install the new petcock try that same hill with the lever in PRIme.

It's possible that you have the throttle wide open, especially if you are in a higher gear, which would leave no vacuum to keep the petcock open.

If it works in PRIme, and you are trying to go up that hill in fourth or fifth gear, try it in ON and in third gear to see if it makes a difference.

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Steve said:
Before you install the new petcock try that same hill with the lever in PRIme.

It's possible that you have the throttle wide open, especially if you are in a higher gear, which would leave no vacuum to keep the petcock open.

If it works in PRIme, and you are trying to go up that hill in fourth or fifth gear, try it in ON and in third gear to see if it makes a difference.

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Click to expand...

You mean there are STILL people who chug these things around in fifth gear?
 
I get as far as 3rd gear and I am already breaking the law by speeding....my 4th and 5th gear must be like brand new......LOL

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GateKeeper said:
I get as far as 3rd gear and I am already breaking the law by speeding....my 4th and 5th gear must be like brand new......LOL
Click to expand...
Not sure what you are talking about there, I can break the law in FIRST gear. :p


Just because the engine goes to 9,000 (or so) RPM does not mean that you have to take it there in EVERY gear. :-\\\

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Steve said:
Not sure what you are talking about there, I can break the law in FIRST gear. :p


Just because the engine goes to 9,000 (or so) RPM does not mean that you have to take it there in EVERY gear. :-\\\

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Click to expand...

But it can't hurt unless you get caught.
 
Steve said:
Before you install the new petcock try that same hill with the lever in PRIme.

It's possible that you have the throttle wide open, especially if you are in a higher gear, which would leave no vacuum to keep the petcock open.

If it works in PRIme, and you are trying to go up that hill in fourth or fifth gear, try it in ON and in third gear to see if it makes a difference.

.
Click to expand...

Tomorrow I have the hill to climb. I will do what you suggested. I was going to change the petcock either way though because I read it is one of those things that is suggested. I will also check fuel levels this weekend. The bike rids amazing after the maintenance work recomended. Just that darn hill is still giving me problems. In regards to the throttle I do not have it totally open but I am going pretty fast 75 the hill is very long it is not a short hill it takes about five minutes to get to the top. Before the maintenance I would have the throttle fully open and I could not get the bike past 70mph and it would die half way up. After the bike easily passes 70 with out a fully open throttle but it still dies.

I will update this post for those curious as to what this issue might be. I appreciate all the suggestions.
 
rockhammer said:
Just that darn hill is still giving me problems. In regards to the throttle I do not have it totally open but I am going pretty fast 75 the hill is very long it is not a short hill it takes about five minutes to get to the top.
Click to expand...
Sounds like either Cajon or Indio, but both of them take longer than five minutes. :-k

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I had this happen to me once on my 450. Going up a steep, but much shorter hill, at 75mph, full throttle. Noticed going up that the bike wasn't pulling like it should, got to the top and it acted as if it was running out of fuel until I pulled the clutch in for a few seconds.

My theory is something to do with the float / fuel level angles as they bike is pointed up. Perhaps a slightly higher fuel level may be key.

Considering that this was a one time thing on a section of highway I'll ride maybe once a year I haven't done any delving into it though.
 
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