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 Post subject: Timing mark
PostPosted: Wed Jan 02, 2013 7:43 pm 
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Joined: Sun Oct 05, 2008 1:32 am
Posts: 73
Location: Georgia, USA
model: 750 Sport
year: 1990
I decided to check my valve clearance since I have not done so since I got the bike. I would like to know if there is more than one mark that can be observed through the sight glass on the alternator side of the engine. I have pulled the timing belt covers and when the cam timing marks are lined up there is a drilled hole visible through the sight glass. Is that drilled hole TDC and is there more than one mark (I have found only one)? Thanks.


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 Post subject: Re: Timing mark
PostPosted: Thu Jan 03, 2013 11:31 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5258
Location: southern Germany
model: 750 Paso
year: 1987
there are a total of 8 marks on the flywheel. 2x TDC, idle firing, full advance and two reference marks for the pick-ups.

G.


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 Post subject: Re: Timing mark
PostPosted: Thu Jan 03, 2013 6:18 pm 
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Joined: Sun Oct 05, 2008 1:32 am
Posts: 73
Location: Georgia, USA
model: 750 Sport
year: 1990
Thanks for the info. I was able to determine that there is more than one mark Unfortunately, they all look the same. I checked the valves on the rear cylinder with it at TDC and the front cylinder at rock point. Same with the valves on the front cylinder, that is with the rear cylinder at rock point. It appears that one valve (rear exhaust) is correct and the rest are tight on the opening rocker and loose on the closing rocker. Does this sound reasonable?


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 Post subject: Re: Timing mark
PostPosted: Thu Jan 03, 2013 10:33 pm 
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paso grand pooh-bah
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Joined: Sun Jan 07, 2007 12:00 am
Posts: 531
Location: holland
model: 907 I.E.
year: 1991
Hi Maico 88,

this sound normal. often the closers are not set properly, resulting in bouncing valves while landing on the seat. this causes slightly deformation of the valve seat and the valve moves further outside towards the opener rocker.
try to get the closing rocker close to zero. the bike runs more quiet and needs less adjusting. don't forget to check the play annually.

Bertus


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 Post subject: Re: Timing mark
PostPosted: Thu Jan 03, 2013 11:23 pm 
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Joined: Sun Oct 05, 2008 1:32 am
Posts: 73
Location: Georgia, USA
model: 750 Sport
year: 1990
Thanks. Guess I will get busy measuring and order shims.


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