To the point, as usual, so am i looking at cam failure or some sort of slipping of the cam gear ? perhaps i should ... anybody want any xb12r bits ??
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| XB12R loss of compression https://www.ukbeg.com/forum/viewtopic.php?f=8&t=6236 |
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| Author: | crazyHT [ 23 Apr 2010 14:04 ] |
| Post subject: | XB12R loss of compression |
Help !, on the run into work this morning suffered an (apparent) loss of compression after engine cut out, the clocks reset themselves, fortunately the rear did not lock up as was going ( quite ) fast on the straight. Once over at the side of the road an attempt at restart resulted in the starter spining very fast couple with an ocasional crack/pop from the exhaust. Serious me thinks so called roadside rescue at this point and went home with tail between legs. Any ideas anyone ? any advice welcome. |
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| Author: | mcrbuelligan [ 23 Apr 2010 16:36 ] |
| Post subject: | Re: XB12R loss of compression |
that happened to my xb12r a few times though It did start up again when I pressed the ignition while I was still moving - dont know the cause - sorry cant be of more help |
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| Author: | vern [ 26 Apr 2010 19:07 ] |
| Post subject: | Re: XB12R loss of compression |
Put it in gear and turn the rear wheel very slowly. Feel for compression and any signs of "jamming" ie a valve touching a piston. If no mechanical contact felt then perform a compression test. With WOT expect 130 -150 psi after 3 or 4 revolutions. Take it from here. |
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| Author: | crazyHT [ 05 May 2010 20:03 ] |
| Post subject: | Re: XB12R loss of compression |
Cant figure this, finally got engine turning over again, following trials with bad/poor earths, have done a compression test on both cylinders - absolutely zero, even tested my compression tester with a foot pump to make sure it was working. Engine turns over very easily and with no 'resistance' ( tested by hand first ), you can see the pistons travelling up and down when looking through the plug holes. cant feel any air coming out through the plugs holes either, but can feel air being pushed out of the breather vents alternatively. Can the cam slip, I assume it is a gear driven set up, find this hard to believe but I am at my wits end trying to find a simple and cheap solution but nothing comes to mind. ECMSpy shows no error codes and performs all diagnostics as expected. Previously burned very little oil and put a smile on my face each and every day I rode it, it is a 2004 model with 22k miles on the clock and has been serviced regularly ( more than recommended ). Just bought a new clutch cable too ... As before any and all comments welcome. |
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| Author: | Maz [ 05 May 2010 20:05 ] |
| Post subject: | Re: XB12R loss of compression |
Bent valves. |
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| Author: | crazyHT [ 05 May 2010 20:18 ] |
| Post subject: | Re: XB12R loss of compression |
To the point, as usual, so am i looking at cam failure or some sort of slipping of the cam gear ? perhaps i should ... anybody want any xb12r bits ??
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| Author: | Maz [ 05 May 2010 20:27 ] |
| Post subject: | Re: XB12R loss of compression |
That's about the size of it mate.......unless you can spanner the bike yourself (and no disrespect intended but it sounds like you cant) even at mine or Tubbs labour rates, your bike is skip fodder. Not wishing to rub salt etc. but said it many times.......XB series = Bic of the bike world 
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| Author: | mcrbuelligan [ 05 May 2010 20:32 ] |
| Post subject: | Re: XB12R loss of compression |
crazyht trade in and get a 1125 or a tuber |
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| Author: | Maz [ 05 May 2010 20:45 ] |
| Post subject: | Re: XB12R loss of compression |
How does that work then  .......trading a non running/scrap bike 
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| Author: | crazyHT [ 05 May 2010 21:01 ] |
| Post subject: | Re: XB12R loss of compression |
Got to do something, the thought of driving my sons vaux corsa 1.2 ecotec ( WOW i hear you say ) for the rest of the great summer we are about to have fills me with absolute despair. unfortunately its fix it or F**k it and see what I get for it in bits. 
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| Author: | mcrbuelligan [ 05 May 2010 21:45 ] |
| Post subject: | Re: XB12R loss of compression |
Maz wrote: How does that work then .......trading a non running/scrap bike this did happen in my case |
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| Author: | Maz [ 05 May 2010 22:08 ] |
| Post subject: | Re: XB12R loss of compression |
.....because your bike is/was still warrantied and H-D are picking up the cost of repairing it 
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| Author: | mcrbuelligan [ 05 May 2010 22:22 ] |
| Post subject: | Re: XB12R loss of compression |
I know Maz  crazyht - is your bike still with warrenty
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| Author: | Adam [ 05 May 2010 22:23 ] |
| Post subject: | Re: XB12R loss of compression |
It's an '04 |
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| Author: | Maz [ 05 May 2010 22:26 ] |
| Post subject: | Re: XB12R loss of compression |
Adam, you forgot the .....think Ray's been on the pop again 
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