Help with rockers
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6th Gear
Joined: Sep 2009
Posts: 12
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Help with rockers
I have an '09 fatbob on which I am installing a stg II 103" big bore kit w/ 255 cams. I am just looking for a little help so I don't screw up anything.
I am reinstalling the rockers. I have the piston at TDC. When I took it apart the rockers sat flat on the rocker box with bolts out and the piston at TDC. Now when putting it back together they do not.
I am thinking that with the stock cams both valves were closed at TDC and w/the 255's both valves will be partially open at TDC, due to the overlap at this point. Is this correct?
If so, do I just evenly tighten the bolts down while the rockers push the valves open?
Thanks for your time.
Linz
I am reinstalling the rockers. I have the piston at TDC. When I took it apart the rockers sat flat on the rocker box with bolts out and the piston at TDC. Now when putting it back together they do not.
I am thinking that with the stock cams both valves were closed at TDC and w/the 255's both valves will be partially open at TDC, due to the overlap at this point. Is this correct?
If so, do I just evenly tighten the bolts down while the rockers push the valves open?
Thanks for your time.
Linz
Seasoned HDF Member
Joined: Nov 2010
Posts: 17,547
Likes: 7,153
From: Oxford, Nc
Yes, regardless of the cam change your lifters also expanded when the pressure on them was released. They'll bleed back down when you install the rockers after a few minutes.
Last edited by Stiggy; Dec 26, 2011 at 05:53 AM.
Road Warrior
Joined: Apr 2010
Posts: 1,739
Likes: 10
From: Suffolk, England
Just stick the bike in a high gear and rotate the back wheel until the pushrods are at their lowest again.
Don't forget to get it back into neutral before trying to start it afterwards though!
Don't forget to get it back into neutral before trying to start it afterwards though!
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