Gs750 cam timing

[Kevref]

I am refitting the cams on my 1977 GS750… got the timing marks all lined up as per the manual. But after putting on the middle tensioner at the top, the  # 1 timing mark on the exhaust side is out… is that correct there is a slight difference after fitting the top tensioner? Thanks all

[Gixer1460]

Yes - invariably there will be slack in the chain and that idler pulls it into the center moving the cams around. Easy way around this is to put cams in correct place and 'karate chop' the slack between to two cams. This acts like the idler and shows if they are right or a tooth out.