Re: R1100RS Mystery

[Bob Hadden <kbhadden@xxxxxxxxxxx>]

This reminds me on the other issue some have had after filter/fuel pump 
replacement.  There are several hose connections inside the tank. If 
one leaks in there, the pump flow and pressure don't get to the 
injectors like they should.  This makes for bad running.  Tom is right. 
  Check the outside stuff, and then be prepared to pull the pump 
assembly out to see what gives inside.

As always, if you have a problem with the bike, look to the last thing 
that was done to it.  There you will find out what got screwed up by 
the dumbass mechanic. (That is, of course, usually me).

Bob Hadden '98RS, '62R27

On Sep 1, 2004, at 11:06 AM, Tom Brown wrote:

> Rob:
>
>> A few months back, my fuel pump failed on one of my favorite
>> California roads, Hwy 25. Pushed it a mile back to Hollister
>> then trailered it home eventually. Wanting to try again, I went
>> down a few weeks back to try again.'Twas not to be...
>
> Changing a fuel pump means getting into the tank where many little 
> gagets also lie.   I'd look there first for this problem.   Did they 
> replace the fuel filter?
>
>
>> There is a straight section, maybe 4-5 miles straight and clear,
>> with enough clear visibility to safely (as for JohnQLaw) ratchet
>> speeds up. I got up to an indicated 110 mph and the bike suddenly
>> started to "backpedal". It would choke up with throttle applied,
>> and when I pulled over, it would not idle. No bad noises, no smoke,
>> no obvious signs of doom. It seemed that it was running on one 
>> cylinder.
>
> A dirty air filter will restrict air at very high loads.  This can 
> make the bike run too rich, foul the plugs and cause the bike to idle 
> poorly.   A clogged fuel filter will restrict fuel and the bike my 
> "backpedal" as well, but when you slow down, it should run normally 
> again unless you've really got it clogged.   I always try the easy 
> stuff first.  I'd change the plugs and the air filter and see if that 
> helps.   If not, I'd suspect  that the fuel filter is clogged...bad 
> gas?  Old filter?
>
> Now, one more thing that will cause an oilhead to run sort of like 
> it's on one cylinder is a severely out of synch condition.  This can 
> be caused by a pebble or other debris getting between the throttle 
> cable and the little pulley on the back side of the throttle body.   
> Sometimes a high speed run can knock little pieces loose from the 
> cooling fins on the cylinders and it could be that something got 
> hooked in the V of the pulley.
>
> You can check this yourself easily.  Just follow the cables down to 
> where they wrap around the little wheels at the throttle bodies.  
> Check to see that both cables are seated properly in the V and than 
> neither are loose or anything.  If you find something, just turn the 
> wheel a little to loosen the cable and get the debris out and replace 
> the cable.   Start the bike and it might just run right again.
>
> That's all the easy stuff I can think of right now.   Good luck.
>
> -TB
>
>
>
>
> Rode to Hollister and pulled the plugs; both caps firmly on and
> correct in their threads. I rode the 100 miles home, as I had no other
> options. Kept the revs up hoping to lessen any load on the motor.
>
> The exhaust seems to have taken on a "golden" hue, which concerns me.
> Perhaps gas continued on the non-operative cylinder?
>
> Any and all suggestions as to where to investigate are appreciated,
> before I take it to the dealer who'll charge me $85 just to look at it!
>
> Thanks!
>
>
> Rob

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