Power loss at 3500rpm

Having Problems with your BMW R1200RT/R1250RT? or have some Maintenance and Service questions?
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arkmark
Posts: 16
Joined: Tue Dec 08, 2015 12:44 am

Power loss at 3500rpm

Post by arkmark »

2012rt with 118000miles on the clock.  I’ve got an issue that has slowly developed from 3500-4000rpm the bike just Boggs down, no power, but as soon as we hit 4K its right back how it should be.  Valves are all within spec plugs are new and I’ve ran fuel injector cleaner all with no change in how it runs.  Like I said everywhere else in the rpm range it runs like a monster but from 35k-4K it falls flat on its face.  So to the powers that by what are you thoughts?
STeinar
Posts: 258
Joined: Sat Mar 26, 2011 9:03 am

Re: Power loss at 3500rpm

Post by STeinar »

arkmark wrote: 2012rt with 118000miles on the clock.  I’ve got an issue that has slowly developed from 3500-4000rpm the bike just Boggs down, no power, but as soon as we hit 4K its right back how it should be.  Valves are all within spec plugs are new and I’ve ran fuel injector cleaner all with no change in how it runs.  Like I said everywhere else in the rpm range it runs like a monster but from 35k-4K it falls flat on its face.  So to the powers that by what are you thoughts?

Check your air filter also !
But BMW are running lean and as most at about this RPM. Could also be low fuel pressure. Check your fuel filter.
STeinar

arkmark
Posts: 16
Joined: Tue Dec 08, 2015 12:44 am

Re: Power loss at 3500rpm

Post by arkmark »

Air filter is new.  What is a way to test the fuel filter? Or just get a new one?

STeinar
Posts: 258
Joined: Sat Mar 26, 2011 9:03 am

Re: Power loss at 3500rpm

Post by STeinar »

arkmark wrote: Air filter is new.  What is a way to test the fuel filter? Or just get a new one?
The easiest would be to visit someone that can measure the fuel pressure AND capacity :-) 
STeinar
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Beagle
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Re: Power loss at 3500rpm

Post by Beagle »

This type of question is common on all forums and whilst they induce several suggestions they rarely result in a pinpoint solution. The only real answer is a diagnostic scan by an appropriate device. Hope you get it resolved.
simbo
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Re: Power loss at 3500rpm

Post by simbo »

If you have Facebook? Join the "BMW R1200RT/R 1250RT Owners Group" page, there's a very knowledgeable chap called Steve Campbell who knows the twin cam RT inside and out, he'll point you in the right direction.
The GS 'is' the better bike :-)
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