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[ssls6]

I may have screwed up.  I'm replacing the lifters and inner cam bearings on my 2010 110" CVO Harley.  I put the bike at the correct TDC for the rear cylinder when I removed the rear rockers, pushrods.  I then moved to the correct TDC for the front cylinder and removed those rockers, pushrods.

I then removed the lifters then cams/camchest.  While in this state, I decided to measure the TIR of my crank (0.005 BTW).  Doing so (turning the motor over) has caused me to lose where I was.

So, I can time the cams to the flat on the crank but that flat puts the rear cylinder at TDC but I don't know if it is the correct TDC or not.  The correct one would have the injector fire off during the compression stroke and not the exhaust stroke.  I know Harley is a wasted spark system so the plugs will fire at each TDC.  I'm just confused now about the timing of the injectors.

Everywhere I look it says to just time the cams to the crank flat (dot to dot).  I feel like I'm missing something to ensure I'm at the correct TDC before putting the cams back in.

Any help is greatly appreciated.

[hd-dude]

You are overthinking it....

Simplified install procedure....

install inner chain on cams with timing marks aligned
install the cams in the plate
install the cams and plate into the motor.
install the sprockets on the outer chain with timing marks aligned
rotate flat in crankshaft to align with flat in pinion sprocket
slide pinion and rear cam sprocket on at the same time and they will be aligned and timed

[ssls6]

Thanks.  I do tend to over think things.  I realize there is no compression/exhaust stroke until the cams are installed.  I guess I'm confused over how the injectors know when to fire and when not to fire off.  Wasted spark I understand but there is no such thing as wasted fuel injection.  Does the computer figure this out each time you start it?  The crank sensor up front is going to see each revolution so it doesn't know anything other than crank position.

....confused in Texas

[ssls6]

I bet the fuel injection watches the MAP sensor and figures out what is an intake stroke thus it doesn't matter until the cams are in.   It has to be something that simple.

[prodrag1320]

just line the timing marks up when installing the cams.as long as their lined up,you don't have to worry about TDC

[ssls6]

Thanks, you're absolutely right.  Older Harley had a cam position sensor so it just took me some time to get comfortable with the idea the ECM can figure out the cam position from other parameters.

My 2010 is all buttoned up and sounds/runs great.  Johnson Hylift slow bleed lifters, new torrington cam bearings, S&S quickees, rocker lockers, new plugs and gaskets/o-rings.  My crank TIR was measured to be 0.005 which isn't great but appears par for the course.  Recentered the oil pump and now my pressure is one dot higher across the board than before.  The soft hammering sound I had around 2500 rpm is gone so maybe the rocker lockers, maybe the lifters, I don't know.

My tensioner shoes showed the smallest amount of wear.  The bike only has 6400 miles so I reused the shoes.  The cams looked good but I could tell the old cam bearings were leaving their mark.  Nothing of real concern but I'm glad they were changed out.  The lobes looked great.

It took me like 10x longer than it should as I was constantly googling, you tubing, and manual reading.  One big thing I learned was this.....

Remove the batwing outer fairing before putting the bike on the lift!!!!!  Put it back on after the bike comes off the lift!!!!  You don't need to do this for cam chest work but I did just for the hell of it.