Honda CB750 CB900 CB1100 CBX DOHC Mystery Cylinder Head Plug
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- Опубликовано: 23 фев 2021
- There is a somewhat mysterious plug on the cylinder head that begins to leak oil. I explain why I find it mysterious and demonstrate a quick repair.
Parts fiches at CMSNL:
www.cmsnl.com/honda-cb750f-75...
The plug itself is Honda part no. 91208-422-003
Here's a tip when you're looking for an obscure part: try Googling with and without the dashes. In my experience, more/different links come up, especially as regards eBay listings.
CB750 DOHC Scheduled Maintenance:
• 1980 Honda CB750F DOHC...
Guma tee: guma.bandcamp.com/merch
gumaverse.com 
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thank you so much Guma, I really needed this part. Very nice video. Cant wait to see your video about carbs. I have a 79 DOHC.
Exactly what I needed to watch, great job. Thank you 👍👍
Wow who knew?! Thanks, super helpful!!
Nicely done.
Good info
Sehr schönes Motorrad..
Danke für den Bericht
That looks like you could tap a thread and make up a metal grub screw.
Anecdotally that plugg is meant to release overpressure in the crankcase before you blow a seal if the crankcase breather is blocked, if you use sealant on the plugg that function would be nulled. But that is only Anecdotal evidence but it seems plausible if somewhat redundant on a "air-cooled" motorcycle. Haven't disassembled a F engine so Haven't been able to check passages my self.
Plausible but redundant indeed! I can see how it would be the first thing to go if pressure was building in the top end
I have a plastic plug/ nut on the chain cover side of a cb750f2n (1993 rc42), it has "do not remove" written into it.
Any idea what lives in there?
Probably blocking a hole that was created when the engine was cast out of aluminum.
Great!! Does the CBX use the same part? Also, can the 750F head be removed with the engine in the frame? I'm getting conflicting views...I remember the road test in CW magazine stating that the frame is arched to allow this, but my Climer manual for the 750 states that the engine must be removed from the frame to take the head off.
Richard, according to the parts fiche this part is on all three of these bikes. The 750 head cannot be removed in-frame. The valve cover yes, but there is not enough clearance for the head to come off.
👍🏻😀
Why not use PC7 to see to Plug hole -
I'd never use a paper towel inside a hole in any engine, your asking for a piece to catch and stay inside potentially clogging an oil passage.