Steveg Posted March 11, 2021 Share Posted March 11, 2021 (edited) Hi, Just thought I would share this with the forum regarding the cam timing on certain GS1000 models with the cam wheel part number 451. A number of years ago, the top end was serviced and as per the manual, 20 rivets between the cam arrows had been set. Although it was not noticed that the end notches did not face each other as the factory manual was followed. However, the performance was always on the pow side for a 1000cc machine and not much was thought about it until I read recently that cam wheelsd with part numbers 451 should have 19 chain rivets between the arrows. This also lines up the cam end notches so they face each other. I took the cam cover off and found that I had the 451 number on the inlet cam and 490 on the exhaustr cam so today I have adjusted this to 19 rivets. see picture. Thinking about this, the cams have 30 teeth so one tooth measures as 12 camshaft degrees (24 crankshaft degrees!) so I am hoping that this fixes the performance issue. There was never any contact between the valves and pistons so I guess I was lucky, but the factory manual did not have this information documented in their manual and I have only just found this out recently. Edited March 11, 2021 by Steveg Too many pictures 2 Quote Link to comment
bomberone Posted March 11, 2021 Share Posted March 11, 2021 Yep definitely sounds like you’ve been lucky if you really have got away with it! Quote Link to comment
AmericanDefender Posted April 26 Share Posted April 26 I think I may have this issue as well. Where do I find the part # for the cam gear? Quote Link to comment
gorbys Posted April 26 Share Posted April 26 5 hours ago, AmericanDefender said: I think I may have this issue as well. Where do I find the part # for the cam gear? It's stamped right there on the cam wheel. 451. Quote Link to comment
Reinhoud Posted Saturday at 03:26 AM Share Posted Saturday at 03:26 AM How many rivets isn't interesting, the gaps at the end need to line up with face of the head where the valve cover mates. How is that? Quote Link to comment
AmericanDefender Posted Monday at 02:19 PM Share Posted Monday at 02:19 PM On 4/26/2024 at 8:26 PM, Reinhoud said: How many rivets isn't interesting, the gaps at the end need to line up with face of the head where the valve cover mates. How is that? Mine are just slightly retarded. Maybe say half a cam chain link. Quote Link to comment
AmericanDefender Posted Monday at 02:24 PM Share Posted Monday at 02:24 PM 3 minutes ago, AmericanDefender said: Mine are just slightly retarded. Maybe say half a cam chain link. This is with the crank at TDC. I've tried everything to figure it out and haven tried to counter it by putting the cams in advanced with the crank slightly retarded. No matter what I do, this is the result. Quote Link to comment
gorbys Posted Monday at 05:33 PM Share Posted Monday at 05:33 PM Chain stretch perhaps? Mine wasnt 100% flush either. Somewhere in between yours and completely straight. Compression is good and the bike runs like it should so not to fussed about it Quote Link to comment
Reinhoud Posted Monday at 09:12 PM Share Posted Monday at 09:12 PM (edited) It's never perfect from factory. When you have sprockets with slots in it you can get it like it should. But I don't think you'll notice a difference when you adjust it like it should. Edited Monday at 09:15 PM by Reinhoud Quote Link to comment
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