Dave
YaBB Moderator ModSquad
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SuzukiSavage.com Rocks!
Posts: 18099
Camp Springs, Kentucky
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I have become aware of 3 different rocker arms in the Savage engine.
The early versions are once piece construction, and the width of the part in contact with cam is narrower than the cam lobes.
I can't document when the change was made - but as some point the one piece rocker arms were changed to have a wider wearing surface, and it is almost as wide as the cam lobes.
The part numbers for the above one piece rocker are 12840-07F00 for the intake and 12850-07400 for the exhaust rocker.
In the 2004 model year there were a lot of upgrades to the Savage, and it may be the rockers were changed as well. The parts diagram shows the 1 piece rockers are listed with the same part numbers listed above - but it also lists the new style rocker that have part number 12840-24B10 for the intake and 12850-24B10 for the exhaust. These rockers are made by brazing a hardened wearing surface on to the rocker.
I will be taking photographs and posting an article in the Tech Section that shows the changes - but until I do I welcome any comments on the issue. I have seen plenty of damaged 1 piece rockers - but my experience with the new style rockers is very limited, as I have only taken 2 bikes apart that have the newer style rockers, and both of them were very low mileage. Has anyone ever seen a 2 piece rocker that has been worn or damaged?
I would suggest that anyone who needs to replace their rockers consider an upgrade to the new style rockers - the parts list doesn't show that the old style has been replaced (superceeded) by the new style - so it may be possible that you can still purchase the older style 1 piece rockers. The rocker arm shaft numbers have not changed, so it appears the rocker arms styles are interchangeable. (It might even be desirable to buy the newer style rockers and sell you old style on eBay....however youzguyz has just proven the early rockers are good for 155,000 plus miles as long as you use Rotella oil and keep you idle speed up where it belongs).
Dave
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