Could it be a bad primary chain
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Cruiser
Joined: Sep 2015
Posts: 168
Likes: 18
From: South Texas
Could it be a bad primary chain
Ok, so 1998 Ultra Classic, I decked the heads .050 added an EV 27 cam, hydraulic lifters, adj. pushrods, ripped out the EFI and put on a Mikuni HSR 42. It runs like a scalded ape, however, it has a clack, clack, clack sound when its running kind of like bad gas pinging. I put it under load, i.e. I held the front brake and let out the clutch slowly and the noise got quieter. I checked the play in the primary chain and it has some tight spots and some loose spots and its adjusted to about 1/2" at its tightest spot. Im so ready to ride this thing but the clacking sound really has me frustrated and worried. BTW 40,000 miles on the counter.
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Cruiser
Joined: Sep 2015
Posts: 168
Likes: 18
From: South Texas
Fairly certain. We put it under load and it quieted down significantly. We are going to take it apart tonight. The only other thing I can think is possibly bad rockers? Its about the only thing that didnt get addressed in the top end.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,066
Likes: 4,568
From: Haslet Texas
That is why I said the first step is to localize the sound.
It could be something as simple as adding a couple of flats to your pushrod adjustment.
FWIW the tightest part of your primary chain should be no tighter than 5/8th" cold and 3/8th" hot according to the book.
Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
What did you preload the lifters to and what is the idle rpm?
I doubt you have any abnormal wear at the rockers. Oem rockers are good for 100k.
I doubt you have any abnormal wear at the rockers. Oem rockers are good for 100k.
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Cruiser
Joined: Sep 2015
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From: South Texas
Im not sure what you mean by lifter preload. Idle rpm is about 1000
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Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
You said you put adjustable pushrods in. How many flats did you lengthen the pushrods from zero lash? Load the lifters....
Your clack could also be a bad Compensator. They are know to get noisy. You obviously have the fsm right?
Your clack could also be a bad Compensator. They are know to get noisy. You obviously have the fsm right?