« Reply #5 on: October 25, 2021, 04:06:44 AM »
In the stock frame, the hoses only fit onto the oil tank and the engine in one way. The S-curved hose goes to the lower rear engine oil port, the other one goes from the outer oil tank spigot to the front engine oil port. This one stands taller off the engine than the first one.
The breather hose on the back of the oil tank goes to the back of the engine until the 1975 K6/F0/later model bikes that have an oil separator, which is a plastic container that is fitted beneath the frame's battery box.
Which year/model is the bike?
It's a bitsa cafe racer not a stock bike. Does the breather from the rear of the rocker cover go to the top of the oil tank?
The tanks changed in 1976 on the K models from the pre K6 oil tanks and again in 1977/78 K model so the year and model of the tank matters. The K5 and earlier oil tanks have a vent off the back of the tank which was eliminated on the K6 tanks and replaced with one on the bottom of the tank to the oil separator(I just became aware of this difference yesterday according to Anders as we were discussing changing out the charging system to his high output adapted system the mounts an R1 voltage regulator under the battery box and the K5 and earlier oil tanks have to be changed to a K6 oil tank for clearance)
I thought I still had pictures of a K4 tank I painted last year but can't find it in my phone and my K6 tank is in my storage so I won't have pictures to post here for a while.....

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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
2008 GL1800 my daily ride and cross country runner
Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A