1999 BMW R1100RT power loss

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  #1  
Old 07-11-17, 05:46 PM
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1999 BMW R1100RT power loss

Got this bike from my uncle for free, has 85k miles on it, he put 60 on it himself. 2 years ago it started sputtering so he took it to a dealer and they told him it has a burnt valve and they wanted $3500 to fix it, so he put it in his garage and got a new bike. Now im looking for a bike and short on cash so i took on the project. the first thing I did was check compression to see which side was "burnt" and got a good reading of 160 on both sides. I didn't search to hard but the internet told me you would get bad readings on a burnt valve. this bikes normal range is 125-145 according to Chiltons. so i moved on to replacing fuel, air filter, spark plugs, oil and fuel filter. I also cleaned both intake manifolds. the bike starts right up, idles good even runs good off the start but at about 5k rpms (8500 red line) there is clear power loss you must shift to continue its very noticeable. Now on my old Honda thats about the range of my power band but I was told this German sucka is all torque from 1500 and on. so i guess my main question is : Can you have good compression with a burnt valve? any other thoughts? thanks.
 
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Old 07-11-17, 06:39 PM
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When I hear power loss, I think of timing. Is there some type of timing chain on them?
 
  #3  
Old 07-11-17, 07:20 PM
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yes, its a 2 cylinder boxer engine. timing chain on each side. nothing has changed, tensioner is fine. id really like to think if timing is off it wouldnt idle fine or jump the line fine.
 
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Old 07-12-17, 04:13 AM
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Is there any chance that one or both chains are stretched?
 
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Old 07-13-17, 09:18 AM
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bump... do i need to post this in a more popular thread?
 
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Old 07-13-17, 02:28 PM
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Not at all. Regular members look at all sub forums.
 
  #7  
Old 07-18-17, 08:51 AM
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incredible as it may seem but it ended up being that the last guy who used it didnt fill it with high octane. added octane booster and she runs fine now.
 
  #8  
Old 07-18-17, 09:31 AM
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Nothing surprises me anymore.
 
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