Lost oil cap, power and misfiring - Road Glide Forums
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post #1 of 27 (permalink) Old 03-17-2019, 02:54 PM Thread Starter
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Lost oil cap, power and misfiring

2005 FLTRI, 117k trouble free miles (for the most part) K&N hi flo airfilter, V&H slip ons, gear driven cams installed at 50k. Run Amsoil synthetic. Ride it on a regular basis.....mostly runs like a raped ape.

Today, making a short 30 mile trip.......cruising down the interstate, at about mile 20+ I noticed a loss of throttle power. Bike slowed from 70+ down to about 60-65 and that is all the power she had. I checked the oil pressure and oil temp gauges and all was in normal range. I went the last few miles to my destination. As I was pulling up to stop I pulled in the clutch and the bike sounded as if it was only running on one cylinder. Once I got off the bike I noticed the entire right side covered in oil and the oil filler/dipstick cap missing.


Got a ride home to get the truck and trailer..........

Thoughts?

Why would the oil pressure get high enough to blow the cap off? Oil level was below full before ride.
Besides finding a new oil cap.......What else should I be looking for?

Thanks in advance

Cut N Shoot Hog Chapter, Patriot Guard Rider
'05 FLTRI, Stage 1 setup and gear driven cams installed.
'12 FLTRU, Stage 1 setup, cams and tuner installed.

Last edited by cloud; 03-17-2019 at 03:09 PM.
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post #2 of 27 (permalink) Old 03-17-2019, 04:31 PM
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I'd have a look in the cam chest to make sure you're good in there.

2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
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post #3 of 27 (permalink) Old 03-17-2019, 05:49 PM
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post #4 of 27 (permalink) Old 03-17-2019, 06:03 PM
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Oil pressure would have nothing to do with the oil cap.


Did you check the oil level after you got it back? How low was it? I suspect some real engine damage from loss of oil.

2013 FLTRU
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post #5 of 27 (permalink) Old 03-17-2019, 06:10 PM
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I ran into a guy a few years back on side of the road. Bike had broken down due to a lack of oil. He told me he thinks he had not put the dip stick back in all the way and it came out during his ride and so did a lot of oil. Oil was all over the right side of his bike too. Like was said above, oil pressure won't cause the dipstick to come out but it may be possible for crankcase pressure to push it out if it's not in all the way. Then you have much larger issues to deal with.


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post #6 of 27 (permalink) Old 03-17-2019, 06:40 PM
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If the scavenge side of the oil pump takes a dump it will wet sump and cause a power loss , also if you have excessive piston ring blow by ( combustion chamber gasses entering the flywheel chamber ) it can increase crank case pressure , which can also lead to wet sumping .. Have a leak down test done to check how well the rings are sealing ..

Feuling makes an oil tank breather kit to help reduce the chance of blowby and oil filler cap ejection

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post #7 of 27 (permalink) Old 03-18-2019, 03:12 PM Thread Starter
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Quick update........

Today I was able to drain the oil out of the bike........drained 3 quarts. Inspected the inside of the cylinders best I could with my endoscope camera.....not much to see actually. I have a cheesy compression gauge and the aft cylinder was showing about 150psi and the front cylinder was making 10-20psi. So.........I stopped at the little bike shop across the highway, normally closed on Mondays but they were there working, I asked them and they couldn't believe the motor has 117k miles on it without any rebuild........they say it needs a complete crank up rebuild. They said they would box up the case and send it to Milwaukee......and they would do the heads and cylinders here. Said it would cost a minimum of $3500......and up from there.....take about 3 weeks.

Sound about right?

Cut N Shoot Hog Chapter, Patriot Guard Rider
'05 FLTRI, Stage 1 setup and gear driven cams installed.
'12 FLTRU, Stage 1 setup, cams and tuner installed.
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post #8 of 27 (permalink) Old 03-18-2019, 05:57 PM
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Quote:
Originally Posted by cloud View Post
Quick update........

Today I was able to drain the oil out of the bike........drained 3 quarts. Inspected the inside of the cylinders best I could with my endoscope camera.....not much to see actually. I have a cheesy compression gauge and the aft cylinder was showing about 150psi and the front cylinder was making 10-20psi. So.........I stopped at the little bike shop across the highway, normally closed on Mondays but they were there working, I asked them and they couldn't believe the motor has 117k miles on it without any rebuild........they say it needs a complete crank up rebuild. They said they would box up the case and send it to Milwaukee......and they would do the heads and cylinders here. Said it would cost a minimum of $3500......and up from there.....take about 3 weeks.

Sound about right?
I'd just buy an S&S motor .

2010 FLTRX , Stage 1, 13" Madstad, Mono tubes, SuperShox, Heritage style bars. Alpine CDE-HD149BT,Soundstream Picasso Nano Series PN4.520 , 5X7 and 6.5 Infinity Kappa speakers
If I have to explain ,you wouldn't under stand anyway.
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post #9 of 27 (permalink) Old 03-18-2019, 06:25 PM
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Compression test first, looksee in the cam chest second.


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post #10 of 27 (permalink) Old 03-18-2019, 07:34 PM
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Can you do the mechanical work yourself? If you can then take off the rocker box cover and see if you dropped a valve. Bad rings wouldn't cause a sudden drop in compression but if you blew a hole in the piston then that's another thing. If it looks like a valve springs failed then pull the heads and just have them repaired, you can get the parts from HD and most local machine shops can resurface the heads and valves. Also check the run out on the crank if the run out is in specs then chances are good that the rod bearings are good to but check the rods for any unusual play. You may be able to fix this yourself but I would recommend that you do a complete top end overhaul which you can do yourself for around $1000. good luck I hope everything works out for the best. HD does have a engine re manufacturing program which they replace everything and for your bike it would cost $3495, you can price a S&S engine and make your decision.


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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.
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