Rear cylinder piston carbon buildup? worse? - Road Glide Forums
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post #1 of 46 (permalink) Old 09-25-2018, 04:53 PM Thread Starter
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Rear cylinder piston carbon buildup? worse?

i've been chasing a weird metallic tapping sound that occurs from 2800-3000rpm that sounded like rocker arms flapping or a lifter not pumping up. only happens while driving and while moving and only through that rpm range. i couldn't replicate it on the bike lift.

so far i totally went through primary, compensator, clutch. replaced lifters, readjusted pushrods, serviced and check rocker boxes and arms, pulled cam plate and checked cams, bearings, and lifters.

finally was able to put a borescope down the cylinders and found the rear piston looking like this. anyone have any ideas if this is normal??? the front cylinder had carbon but it wasn't broken apart and it looked like a normal piston that had been running.

think this has something to do with the noise i've been chasing?






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post #2 of 46 (permalink) Old 09-25-2018, 05:17 PM
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I think I'm chasing the same noise. Everyone tells me there is nothing wrong with my bike. It runs good so I cant argue, but the noise is concerning to me...I hope you find it.
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post #3 of 46 (permalink) Old 09-25-2018, 05:29 PM Thread Starter
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my whole deal with the noise is it's new at 36k on the clock. started on my last road trip. i'm not a fan of "new" noises of this nature

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I think I'm chasing the same noise. Everyone tells me there is nothing wrong with my bike. It runs good so I cant argue, but the noise is concerning to me...I hope you find it.

2012 FLTRX - stage 1.5 headwork, dragos 580 cams, 10.25 comp, FM stage 1 intake, dragula 2, TTS, 13" windvest, 14" evil apes, JRI 12" shocks, progressive monotubes, hertz and alpine, hawg wired amp, custom LED gauges, custom dynamics LED signals, lots o' powder coat
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post #4 of 46 (permalink) Old 09-25-2018, 06:16 PM
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Piston looks normal. I bet the noise you are hearing is the rocker shaft against the bolt. Very common and you can get rid of it by installing a thing called Rocker Lockers.

It does look like you have some pretty good scratches on the cylinder wall though.

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post #5 of 46 (permalink) Old 09-25-2018, 07:23 PM
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That piston looks pretty god as far as build up. Shows some detonation, so the tune could use a little work still.

But that heat streak up the stud hole doesn't look good. Jugs been pertty hot.

IIWY, i'd run a leakage test and see what the rings are doing. Check it a a few locations in the bore.

After that I'd button it up and try to localize the noise a little better. If you can't duplicate it without a load on it, then crank-compensator-trans would be the areas of concern.
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post #6 of 46 (permalink) Old 09-25-2018, 08:19 PM Thread Starter
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roller rockers installed about 10k ago

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Originally Posted by RGKen View Post
Piston looks normal. I bet the noise you are hearing is the rocker shaft against the bolt. Very common and you can get rid of it by installing a thing called Rocker Lockers.

It does look like you have some pretty good scratches on the cylinder wall though.

2012 FLTRX - stage 1.5 headwork, dragos 580 cams, 10.25 comp, FM stage 1 intake, dragula 2, TTS, 13" windvest, 14" evil apes, JRI 12" shocks, progressive monotubes, hertz and alpine, hawg wired amp, custom LED gauges, custom dynamics LED signals, lots o' powder coat
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post #7 of 46 (permalink) Old 09-25-2018, 08:23 PM Thread Starter
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i did have an issue with the tune originally so think those marks are from a long time ago (i hope). my last tune was from bob at RC cycles and i have been running it for about 20k miles since he did the tune with no pinging.

i did a leakdown the other month and all was well. i didn't check different spots in the cylinder though as it is hard to turn the wheel once the air is pumped in. compression was good also.

compensator was replaced not too long ago and it is still pristine. no metal in transmission oil or metal when i took tranny cover off.

how would i check crank? anything else to check for transmission? can a bike lose a tune if an O2 sensor goes bad or anything like that? i am really starting to hit a wall. motor mounts? front stabilizer link?

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Originally Posted by Thermodyne View Post
That piston looks pretty god as far as build up. Shows some detonation, so the tune could use a little work still.

But that heat streak up the stud hole doesn't look good. Jugs been pertty hot.

IIWY, i'd run a leakage test and see what the rings are doing. Check it a a few locations in the bore.

After that I'd button it up and try to localize the noise a little better. If you can't duplicate it without a load on it, then crank-compensator-trans would be the areas of concern.

2012 FLTRX - stage 1.5 headwork, dragos 580 cams, 10.25 comp, FM stage 1 intake, dragula 2, TTS, 13" windvest, 14" evil apes, JRI 12" shocks, progressive monotubes, hertz and alpine, hawg wired amp, custom LED gauges, custom dynamics LED signals, lots o' powder coat
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post #8 of 46 (permalink) Old 09-25-2018, 08:30 PM
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You might want to vent the breather vents to the outside on the motor instead of them routed back into the throttle bodies. The oil going back through the motor is contributing to the carbon build up.
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post #9 of 46 (permalink) Old 09-25-2018, 10:55 PM
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You might want to vent the breather vents to the outside on the motor instead of them routed back into the throttle bodies. The oil going back through the motor is contributing to the carbon build up.
This is what I did a long time ago , and if the carbon just bugs you , remove the air cleaner , crank the bike up , let it get warm and take a squeeze bottle with water in it and shoot a couple good shots into the intake , do that at a high idle maybe 2000 max , it will hit the cylinder as steam and break up the carbon , but the carbon doesn't look bad , seen worser ..

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post #10 of 46 (permalink) Old 09-25-2018, 10:56 PM
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Have you checked the crank run out ??

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