Have a Question? Call 714·598·8392

Flat Under seat Oil Tank with or without Battery tray


This is to fit All HONDA CB750K & CB750F Models that are SOHC 1969-1978


Well, for many years I have tried all sorts of concoctions to get rid of the ugly stock oil tank on the SOHC Honda’s, I also have tried round tanks, square and stand up tanks, I now have a good selection of Oil tank to offer you now and this one is the best yet. Take a long look at the photos, I want you to see every angle of this set up, it functions so well and onnce in the chassis under the seat, its almost invisible.

Honda Flat 2

Take a look and see what you think, simply remove your old Oil tank and lines, then Bolt the Flat Oil tank under your frame, secure by drilling in frame and attaching Bolts through the frame and into oil tank, as easy as that. This holds 3 quarts of oil plus your oil lines, thats plenty enough and have sold many of these tank units.

Honda Flat 3

This tank as i said is available with or without the Battery tray and is ideal for the Cafe Racer, Brat, Bobber and Chopper people that want to get ride of the side covers and oil bag and have the frame all open either side for a much cleaner look. Quality counts and this really is a superb Oil Tank unit for your Custom machine.

Honda Flat 4

This tank also comes as a complete kit, meaning it also has the oil line adapter plate and all the 90 degree Barbed elbows that you will need and all you do is decide what length hose you will be needing and buy the hose of your choice and simply fit to the barbed ends with hose clamps.

Honda Flat 5

As these old girls only run 50 odd pounds of pressure, there is no worry about an oil line popping off, and boy will this change the look of your trusty in line four motorcycle.


Filler cap is at the top of the tank and under your seat, so tucked away and if you choose the battery tray, a small Anti Gravity 8 cell will do just fine to get the power to your bike.


Have a look and see what you see, as I have sold a few of these and people love the ease they fit and the cool way they look.


If you want to change the look of your 500 pounder and have the frame more exposed, for that stripped down Brat style look, then here it is, This is the Real McCoy!


So, if you are creating an inline Four and want a better Oil Tank, then you have come to the right place indeed. This really is a superb part and changes the look and style of the machine right away.

It is simplistic yet more than just functional, this fits easily under the frame of you SOHC HONDA FOUR and using just 4 button head bolts, you can simply drill through your frame and secure the Oil Tank in just a few minutes, easy as that.

As you can see, I have added more photos so you can get a better look at how this is put together, this is welded and then pressure tested to make sure all is good and no leaks.

You choose to paint etc but this is how she comes, all ready to fit to your machine.

You can see the Battery area, you can use this for the 8 Cell as previously mentioned or just to fit your electrical into if you are using a battery system somewhere else on the bike.

Wanted to show you all the dimensions, that way we are all on the same page.

The box is 2 and a half inches deep is great for one of the 8 cell Anti- Gravity units and tucks in there neatly with still room for fuse box or solenoid etc.

The tank tapers a little as the frame does, so nothing sticking out of the way, this is a contoured tank for the CB750K or F frame and it tucks in nicely if I do say so myself.

This is the front end of the tank and the Cap is the right height so your seat base will not touch it, a lot of time and effort has gone into the design of this piece.

Seriously, you cannot have enough photos to look at when you want to purchase an item, so I try as best as I can to fulfill that option to give you as many angles as possible and that way I know that you are happy and know that this is just the thing you have been looking for.

You can see the bungs are covered up but below on the next photo you will see that the Fittings are all included for this set up.

Here you have the fittings for the tank, you use your own hose of choice as I do not know how long you will require, but these barbed fittings are what we supply and work really well.

Lastly, these also come with the Adaptor kit, you simply fit the O-Rings into the side of the motor, then fit the plate and then screw the 90 Elbows in and then just measure for your hoses you need and you are sorted out.


PLEASE NOTE: This is a Special order part, there is a No return policy on these Oil tank Units as they are made to order, if you feel you dont think you can use it, please do not order, as these take some time to fabricate.

If it is faulty, then we will replace if you send it back to us, but being as this is a specialized part, we cannot refund on the oil tank if its not faulty. We can give store credit to the value and you send back but please look at the photos to see if this is the design you require for your CB750 HONDA.




Weight 6.0 lbs
Dimensions 16 × 7 × 5 in


There are no reviews yet.

Be the first to review “Flat Under seat Oil Tank with or without Battery tray”