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 Post subject: Re: Valve clearances and stuff
PostPosted: Fri Oct 05, 2018 2:02 pm 
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Location: Cardiff UK and Dordogne France
model: 906 Paso
year: 1990
Hi guys. I have been away from the bike for several weeks and have just started working on her again. I did the first 3 openers and closers and I am really pleased with the clearances that I now have. Now number 4 which just happens to be the least accessible (horizontal inlet). I took the opener shim off and tried to remove the closer but it would not move. I could get it to push down but could not get it to clear the groove in the valve where the retainer sits. Eventually I managed it with a bit of brute force and tons of ignorance. It appears that the retainer may have hammered the valve stem to give a small lip in the grove near the end of the valve. My dilemma is do I take the engine out of the frame and remove the head and clean the burr off the valve, or just replace the valve altogether, or do leave the engine where it is and try to get a file in and just aim to remove the burr is situ. Because of clearance this will undoubtedly be difficult. Help please, what would you do.


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 Post subject: Re: Valve clearances and stuff
PostPosted: Sat Oct 06, 2018 8:22 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
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Location: Scotland
model: 907 I.E.
year: 1994
Working on other peoples engines, and at least once on my own, I have experienced this a few times. The lip is caused by an excessive closer clearance allowing the retainer rings to hammer against the valve groove hence creating a burr. Quite often the retainers are also broken.
My answer has been to use a piece of emery cloth to rub the burr away with the valve in situ. Access is difficult but fortunately not much rubbing is usually required to remove the burr so that the closer shim slides on and off easily.

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 Post subject: Re: Valve clearances and stuff
PostPosted: Sat Oct 06, 2018 1:13 pm 
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Joined: Thu Apr 28, 2011 2:56 pm
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Location: Cardiff UK and Dordogne France
model: 906 Paso
year: 1990
Thank you Derek. It is always encouraging when you hear from someone who has had the same problem. I know access will be difficult but I am pleased that you succeeded in removing the burr with a bit of emery. I will definitely give this a go. As you say it can't be much material that needs to come off as I managed (eventually) to get the old closer shim off. I suppose if any valve clearance is going to be neglected by previous owners it would be this one, ie the least accessible.

It has to be worth a try and is much better than taking the engine out and the head off.


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 Post subject: Re: Valve clearances and stuff
PostPosted: Sun Oct 07, 2018 8:41 am 
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paso grand pooh-bah
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model: 907 I.E.
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Definitely worth a go and incidentally, you don't need to remove the engine to take the cylinder heads off. The only hassle is having to drain the coolant.

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2017 Supersport 939
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 Post subject: Re: Valve clearances and stuff
PostPosted: Fri Oct 12, 2018 1:33 pm 
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Location: Cardiff UK and Dordogne France
model: 906 Paso
year: 1990
Thanks again Derek. I had already drained the coolant when I took the radiator off to give me a bit more room to get at it.


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 Post subject: Re: Valve clearances and stuff
PostPosted: Sat Oct 13, 2018 10:06 am 
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Location: Cardiff UK and Dordogne France
model: 906 Paso
year: 1990
5 minutes with a piece of fine grade emery and the closer shim slides on a treat. What was I worried about. A lot easier than taking the head off.


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 Post subject: Re: Valve clearances and stuff
PostPosted: Sun Oct 14, 2018 9:09 am 
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paso grand pooh-bah
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model: 907 I.E.
year: 1994
Good stuff Giscard, it's not so hard really. :thumbup: That's something else you've learned :)

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1982 Pantah 500SL


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 Post subject: Re: Valve clearances and stuff
PostPosted: Fri Oct 19, 2018 9:03 am 
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Joined: Thu Apr 28, 2011 2:56 pm
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Location: Cardiff UK and Dordogne France
model: 906 Paso
year: 1990
All back together and the engine is running nicely :thumbup:


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 Post subject: Re: Valve clearances and stuff
PostPosted: Sat Oct 20, 2018 9:06 am 
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paso grand pooh-bah
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model: 907 I.E.
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Good to hear that Giscard. Well done. :)

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