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Author Topic: XBR 500 Breakdown, No Comprssion  (Read 741 times)

pitza

  • Guest
XBR 500 Breakdown, No Comprssion
« on: October 19, 2007, 06:18:10 PM »
Hi all,  On the way to work the other morning my XBR 500 suddenly decided to pack up and to cut a long story short I have a very weak spark and no compression! What do you think the problem is and what can be done please?      Thanks in advance  Pitza.
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guest295

  • Guest
Re: XBR 500 Breakdown, No Comprssion
« Reply #1 on: October 20, 2007, 07:59:07 AM »
Broken cam chain? Jammed decompressor? Don't worry about the spark until you get the rest sorted.
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pitza

  • Guest
Re: XBR 500 Breakdown, No Comprssion
« Reply #2 on: October 21, 2007, 03:06:29 PM »
When I disconnect the decompession lever there is still no compression.
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pigafetta

  • Guest
Re: XBR 500 Breakdown, No Comprssion
« Reply #3 on: October 21, 2007, 07:43:29 PM »
Remove the 'valve-tappet-inspection-hole-cover-wotsit' near the decompressor lever and look in the hole to see if the valve lifter's working when the decompressor lever's pulled. It might be jammed open.
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guest295

  • Guest
Re: XBR 500 Breakdown, No Comprssion
« Reply #4 on: October 22, 2007, 08:10:37 AM »
and, obviously, turn the engine over to see whether the valves are moving and whether one of them is jammed open.
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xbruby

  • Guest
Re: XBR 500 Breakdown, No Comprssion
« Reply #5 on: October 22, 2007, 03:20:51 PM »
Best thing to do is whip the rocker cover off and take a good look, should be reasonably clear if the decompressor is sticking. Have you visually checked the external action of the valave decompresssor? Is it moving freely or sticking?
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