Dipstick popping out

[Gonzo]

My buddy has a 1990 flhtcu, with an S&S 96 inch we installed about 4 years ago. Seems like now all of a sudden when he goes on a long ride, his dipstick will pop out. I know I've seen this thread on here before, but cant remember what the problem was. Anybody got any ideas. I told him my first thought was either the pressure relief valve on the oil pump was sticking, or a plug in one of the oil lines or passageways. Any help?
Gonzo

[Gonzo]

I think I also heard it could be from putting a TC-88 oil filter on an Evo, but I wasnt sure if I was remembering right......

[HDdude5]

If the dipstick has O Rings on it, replace them. If it is the other style, the rubber is probably just giving it up after all these years. I'd try the above before I do any sort of surgery.
Bill

[hotham]

I put an after market dip stick in mine and found out later,  that the end of the stick was bottoming out.  This was not unusual.  This can cause your problem.

[Scooter1-2putt]

On my 98' FLSTC the dipstick popped out a couple of times after a oil change. I sucked out about 1/4 to 1/3 qt. of oil and haven't had it pop out again.

Scooter

[bobrk1]

according to the HD catalog I looked at the better than stock filter fits both, check that the breather is not blocked, is the dipstick loose?

[mldmkr]

'99 FLSTC evo. Dealer convinced me to use the TC filter when I first bought the bike. Plug would pop out occasionally. Three years later and  after 3 sets of rocker gaskets I stopped using it. Haven't had a problem blowing the dipstick except for one time (overfilled). To insure good grip of the rubber with the neck of the tank, after checking oil I wipe dry the neck along with the rubber of the dipstick...seems to work. Ride safe.....Fred.

[taddpole76]

I have an aftermarket dipstick, the type with the temp gauge, on my '91 softail. several ears ago....maybe 5.....or 8 years.....10?....., the dipstick would pop out when I would first start the engine. I fixed the problem by buying a thin O-ring at a local hardware store, maybe 1/32" cross section diameter, and installed it on the rubber plug, in between the two raised sealing portions of the plug. Works great. Still have it on the bike now.

Before I put the O-ring on, I installed the original stock dipstick, I didn't have a problem with it popping out. My conclusion is that the aftermarket dipstick did not have as tight of a ftting tolerance, or the rubber wore out some or compressed.

[EagleFTE]

We see these posts from time to time and I always wonder how often this is caused by too restrictive of a oil filter or over servicing.  Evos don't like a restrictive filter and some of the good car filters as well as the 5 micron HD filter have been known to cause problems.

[harleytoprock]

If the oil tank is overfilled, the dipstick can pop out.

[Hillside Motorcycle]

They just get worn after a period of time, and need to be replaced.
I'd start there.