October 10th, 2019, 07:19 AM | #1 |
ninjette.org newbie
Name: Tyler
Location: Royse City, TX
Join Date: Oct 2019 Motorcycle(s): 2004 Ninja EX250F Posts: 2
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HELP!!!!! Plastic plug on the side of Cylinder Head popped out for the second time.
The little round plug on the top left side of the cylinder head has popped out for the second time (this time while riding, the first was when I was in a parking lot) I honestly have no clue what could cause this??? I thought maybe the crank case breather hose was clogged and it had excess pressure.The first time I checked it, there was no clogging/debris.
Any insight into these engines would be greatly appreciated as this part cant be ordered online as far as I can tell. If someone does know where I can order it, please let me know that too. |
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October 12th, 2019, 02:46 AM | #2 |
ninjette.org member
Name: Garry
Location: Bungendore Australia
Join Date: Jan 2019 Motorcycle(s): GPX250 1989 model and 1990 model Posts: 98
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My best guess is that it has shrunk and gone hard and the least little bit of pressure causes it to pop out. Never heard of this before. You can plug the hole with the correct replacement part and see if it stays fixed or just use whatever fits in the hole to stop oil leaking out I suppose?
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October 12th, 2019, 06:57 AM | #3 | |
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Name: Gordon
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OP will likely need to resort to some sort of sealing adhesive. I'd suggest researching a quality product that will be permanent in nature. Do your homework, JB Weld, for example, has some new versions out there.
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October 12th, 2019, 09:46 AM | #4 |
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That thing is just a "core plug".
This is a characteristic of every engine is constructed using sand-forms to create the internal passages necessary for coolant and oil flow and other items. Every sand-cast engine block or head has one or more of these holes that are included in the design to allow quick, easy and complete removal of the sand-form after the casting process is finished. So yeah, just use something like JBweld to stick it back in there for good. https://en.wikipedia.org/wiki/Core_plug |
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October 12th, 2019, 12:13 PM | #5 |
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Name: John
Location: Appleton, WI
Join Date: Apr 2015 Motorcycle(s): Ninja 300 (race), Ninja 1000 (road) Posts: 504
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Check your crankcase vent to make sure it's not blocked and building up pressure inside there. That's the only time I've ever seen those pop out. Kinked hose where you don't expect is what I'm thinking if the actual vent is clean. Check the whole run. It only ever pops out from excessive pressure.
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October 12th, 2019, 01:51 PM | #6 | |
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Location: North Carolina
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October 12th, 2019, 02:24 PM | #7 | |
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My guess about this particular core plug is that having that hole there: aids sand removal after casting, provides a wash-out path during machining, and maybe even gets used as a pick-up or hold-down point on the assembly line. |
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1 out of 1 members found this post helpful. |
October 14th, 2019, 07:01 AM | #8 | |
ninjette.org newbie
Name: Tyler
Location: Royse City, TX
Join Date: Oct 2019 Motorcycle(s): 2004 Ninja EX250F Posts: 2
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