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Engine noise, right side, 76 R75/7

S

skittlz74

New member
Ok I need some guidance....I have checked and rechecked all the usual suspects when it comes to engine noise, but I cannot seem to find what is causing the right side to be so loud? Left side sounds great, and right side matches everything as far as we can tell.

Valves have been adjusted to spec, rocker arms are nice and tight with the tiniest of movement and oil seeping out, pushrods are not hitting the walls, exhaust is tight and no leaks, etc.

BTW bike has 45K miles on the clock and is running really well otherwise.

Thoughts?

Video of both sides......

https://youtube.com/shorts/pdmJLf0FnSU?feature=share

And up close and personal with the right side...

https://youtube.com/shorts/tPjtvubQUGc?feature=share

Many thanks in advance!!!
 
A broken tappet is a possibility. The pieces will remain in place and the tappet will continue to function, just noisy.
 
swall said:
A broken tappet is a possibility. The pieces will remain in place and the tappet will continue to function, just noisy.
Click to expand...

Might be a stupid question, but how do I check that?

I am also going to let her idle with the cover off to see if I can pinpoint a location.....
 
Do you have a mechanics stethoscope? This could also help pinpoint the location of the noise.
 
for me, almost everytime is the carbs are out of adjustment and sync.......the clutch is the culprit for some reason kinda banging around as the engine works to catch up with the other side.........Anyway it's a sure sign for me to work a bit with the mercury guage.........God bless........Dennis
 
DennisDarrow said:
for me, almost everytime is the carbs are out of adjustment and sync.......the clutch is the culprit for some reason kinda banging around as the engine works to catch up with the other side.........Anyway it's a sure sign for me to work a bit with the mercury guage.........God bless........Dennis
Click to expand...

The carbs are tops! We synced them up last week; they were way out of whack and now ticking along nicely.
 
Report back what your measured rocker arm end float is.
  • Engine cold
  • Engine at TDC on the compression stroke
 
Lacking a stethoscope, pick a fat Phillips screwdriver, stick the handle firmly into your ear, and use the tip as your probe.

If it's not a tappet - in the second video, I (may have) heard a higher-pitched tapping noise... bad needle bearing on the rocker arm? I also recall that the tappets were upgraded due to cracking at the top and/or bottom of the "window".
 
FIXED!! OK so popped off the cover to see if we could pinpoint the noise while she idled, and still wasn't totally apparent, we decided it was the rocker arm. Pushrods and tubes are great and centered, tappets are in spec. After the 3rd attempt at these rocker arms, she is now operating as she should!! It is amazing how such a TINY adjustment can make such a huge difference!!

Thanks everyone for the repsonses!!
 
20774 said:
Glad you got to the bottom of it! What minor change did you make??
Click to expand...

Just a minuscule adjustment to the rocker blocks, a literal touch closer together. I can barely feel it move, if at all, while I still see the oil film squeeze out:)
 
skittlz74 said:
Just a minuscule adjustment to the rocker blocks, a literal touch closer together. I can barely feel it move, if at all, while I still see the oil film squeeze out:)
Click to expand...

good for you. FWIW, I set the rocker end float on my R90s to about .003" and its very quiet.....for an Airhead anyway. :)
 
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