Tuning evo after cam install
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finished up bike tonight and fired it up. I have a very loud tapping in the cam chest. I shut it down and let it sit for 10 mins and started it again, and still loud tapping. Starts good and idles good but loud tapping. Now what lifters, pushrods? I installed new lifters which I soaked in oil for a day. When I installed pushrods I brought a lifter to the top and adjusted the opposite lifter 3 turns as directions stated. Example brought front intake lifter to top and installed push rod and adjusted on rear intake. I extended pushrod with fingers until there was no up and down movement and then adjusted 3 turns. Could it be the new lifters? How long do they take to pump up?
Dirt don't hurt
Joined: Jan 2011
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From: Haslet Texas
finished up bike tonight and fired it up. I have a very loud tapping in the cam chest. I shut it down and let it sit for 10 mins and started it again, and still loud tapping. Starts good and idles good but loud tapping. Now what lifters, pushrods? I installed new lifters which I soaked in oil for a day. When I installed pushrods I brought a lifter to the top and adjusted the opposite lifter 3 turns as directions stated. Example brought front intake lifter to top and installed push rod and adjusted on rear intake. I extended pushrod with fingers until there was no up and down movement and then adjusted 3 turns. Could it be the new lifters? How long do they take to pump up?
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yes I was on heel of cam. Took out lash and then adjusted 3 turns. After adjusting 3 turns I was still able to twist the pushrod (didn't have to wait for lifters to bleed down before twisting them). I waited 15min between each adjustment anyway to be on the safe side. I figured this was do to installing new lifters.
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yes I was on heel of cam. Took out lash and then adjusted 3 turns. After adjusting 3 turns I was still able to twist the pushrod (didn't have to wait for lifters to bleed down before twisting them). I waited 15min between each adjustment anyway to be on the safe side. I figured this was do to installing new lifters.
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I don't have an oil pressure gauge. I will check for oil in the top of the tappet blocks today after work. How long will a new dry lifter take to pump up and stop tapping? Should I pour a little oil in the top of the tappet blocks?
Road Captain
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From: Florida
I dont think pouring it into the top will work because they pump up from the bottom using oil pressure. One thing that can be done is to take the spark plugs out and turn the motor over in 5 second intervals. Once you know you have oil pressure (you cant really check w/o a guage) you do about 4 more 5 second intervals and the lifters should be pumped up. If you just changed cam then your oil system should still be fine, assuming it was before. If the lifters are dry when you check, i would try 4/5 5second intervals of turning the motor over and check the lifters again for oil.
Last edited by Frankenbagger; Mar 8, 2012 at 08:02 AM.
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From: Florida
Before trying to pump the lifters up you may also want to adjust the pushrods one more time (wont take long if the lifters are dry because they bleed down fast). This time I would do it by pulling the timing hole on the case and putting each cylinder at top dead center and adjust the pushrods on that cylinder. With dry lifters you have to be very careful when finding the "zero lash" that the manual talks about because if the pushrod sits for a very short time you will be able to turn it again and some people then think they are not at zero lash. Find the zero lash and stop right there from that position do your 18 turns then lock the pushrod. As soon as you can turn the pushrod again its safe to move to the other pushrod on that same cylinder. After you can turn both pushrods on that cylinder, put the other cylinder at tdc and repeat the process with that one.
I know the "opposite lifter" method you described works, but it is a little more confusing and easier to make an error, this will ensure you didnt mistakenly bottom anything out before you go cranking the motor over a bunch to pump the lifters.
I know the "opposite lifter" method you described works, but it is a little more confusing and easier to make an error, this will ensure you didnt mistakenly bottom anything out before you go cranking the motor over a bunch to pump the lifters.
Last edited by Frankenbagger; Mar 8, 2012 at 08:15 AM.
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I readjusted the pushrods last night, and cranked the motor a few times with out plugs to help move the oil. Started up and the tapping is gone. I think there might be a very minimal ticking but that could also just be the difference in the cam. I will stop by my indy sometime and see if he thinks it is normal. Runs a lot better. I could feel the difference. Had a few coughs out the carb so I need to turn my pilot screw out a little, and check my timing but I think I am good to go. Thanks!