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Re: [ST] Stumbling Sprint - ideas?



I had this exact problem on my 2000 RS. Have the mechanic check
the throttle stepper motor housing; if it's cracked (which is not
an uncommon occurrence) it will bleed air into the throttle
bodies and mess up the FI map.

- -Keith
'03 Blackbird

Thursday, July 29, 2004, 11:42:00 AM, ST@xxxxxxxxxxxxxx wrote:

> My '99 Sprint ST went to the shop for the 12k service and 
> also to correct a problem where the bike would stumble 
> pulling away from a stop.  Went to pick it up & they couldn't
> replicate the stumbling problem, but on the ride home, it 
> did it from about 1/2 the stops. I took it back, the head 
> tech took it out and had it happen to him. No trouble codes
> were stored in the engine 'puter.  They replaced the timing 
> pickup, but that wasn't it.  They've now had it a 4 weeks
> and still haven't figured it out (I wrenched my ankle - so
> I really didn't miss much saddle time), so I'm tempted to 
> just get it back and trying to fix it myself/find another
> mechanic.  

> Symptoms:  Got the Sprint last Oct. w/9k miles, and it ran 
> flawlessly for almost 3k [s]miles until late June when the
> stumbling started. Initially it was just once a ride and 
> has gotten worse. It stumbles pulling away from a stop, and
> sometimes dies completely. Usually restarts right away,
> sometimes requires a bit of cranking, on rare occasions 
> takes a lot of cranking to restart.  If you rev it to around 
> 3k w/ the clutch pulled in, the engine speeed seems to waver
> a bit.  Mechanic said they looked for vacuum leaks and 
> didn't find any.  Last I talked to them they were thinking
> that maybe the fuel pump might be cutting out.

> Anyone have ideas on where to look?  Thanks,

> Rob





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