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Yamaha FJR Motorcycle Forum

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  1. J

    2007 AE Has a low piston 4 pressure

    Upon further inspection. I can't find a single thing that is not wrong with piston 4. 3 out of 4 valves are out of spec on the long side by .02mm+ The exhaust is not air tight. The spark plug threads are trashed. I think that there was a low speed lay down on the left side of the bike which...
  2. J

    2007 AE Has a low piston 4 pressure

    I probably could but it would be nearly impossible to see what I am doing. I also want to have a look at the cylinder. I did manage to get pressure after putting some oil down there which could mean a bad piston ring. The engine was still warm.
  3. J

    2007 AE Has a low piston 4 pressure

    The time-serts are a metal sleeve. They also sell a high temp thread lock compound. It should be pretty good. Not cheap but its a good tool to have.
  4. J

    2007 AE Has a low piston 4 pressure

    Upon further investigation I found that the spark plug threads are ruined. My testing tool got stuck and when I ran a thread chaser down there it had quite a bit of wobble even when bottomed out. Some gorilla screwed a spark plug in there sideways. That stripped out metal went into my...
  5. J

    2007 AE Has a low piston 4 pressure

    Well I went and bought myself an FJR It only had 14k miles and the price was low. It is a clean looking bike. When riding it there is a bit of bogging at low speed and a little vibration in the handle bars at speed. I really just thought it needed a throttle sync, and clutch engagement...
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