Question about 2003 BMW R 1100 S BoxerCup Replica

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Compression I took apart the top end to replace the old gaskets. When I put it back together I messed up and didn't get the timing right. I only realized this after trying to start it for 15 minutes and then going back to the manual. I went back and fixed the timing, now it turns over and the plugs are firing, but there is just no compression. I'm guessing that I've "fubar'd" the valves, but that's just a guess.

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Make sure you got the valve timing right Wink And then make sure you didn't slam a valve into the piston when you tried to crank it over before…

Posted on Nov 20, 2008

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Is this the first time you have done a job like this? its been a awhile since a have done a 1100 vstar but you need a new gasket if my trusty old brain severs me right it acts as a spacer for the cover so it dose not rub on the clutch basket.
this is a link to the micro phish for your bike
check it out and let me know
Mark Woodring

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Hi, I just bought a stock 2003 ttr 125. The bike had been sitting for years and barely would run. I took the air filter out and it was full of gasoline. I took the carb apart and cleaned all the gummed...

Piston rings may be sticking after sitting for so long. It may serve you well to remove the top end, paying special attention to the timing alignment as you do. Visually inspect the piston and rings. ensure the rings can move freely in their grooves. Look at the piston for signs of blow-by. A burned up surface of the piston that extends past the rings onto the skirts. You may simply re-ring this machine and it would solve your problem if you view these problems.

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Two weeks ago, I started my own project and I'm totally new at this, so I need some help. I heard a clunk sound every time I started the bike and it would go away once the engine warmed up. Talking to some...

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By "all timing marks seem to be right", are you talking about the timing marks on the alternator rotor or the camshaft timing marks? A 1985 model is a pretty old bike. If it has never had a timing chain or the adjuster guides replaced, you may need to address this issue. Not only do you need for the ignition timing to be correct, you need the camshaft timing to be correct as well.

In your problem line, you stated that you had fuel, and spark. You need three things to get any engine to run, fuel, spark, and compression. Do a compression check on the engine. If the compression is low, it won't start either. Three things can cause low compression. Bad rings, improper camshaft timing, and valves not seating properly.

If you want to get the bike running again, I would suggest you do a "top end job" on the engine. Pull the head and cylinder. Measure the cylinder for wear and bore for a new piston if necessary. Replace the rings. Have a valve job done on the head at a local machine shop. When you put it back together, do so using a new timing chain and adjuster slides. You'll be surprised at what a "New" engine feels like. Good Luck!

Jan 31, 2010 | Honda XR 200 Motorcycles

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