Author Topic: CL450 gas tank on 78 cb750k (Read 4361 times)

Djfob · « **on:** November 07, 2013, 03:13:13 PM »

Just finished notching the frame to fit the back of the cl450 tank. Now it looks like the petcock will hit my carb.

Looking for the simplest solution, I'm thinking blocking this off and welding a new bung. Have a mig but don't trust myself doing this, tank is dry/rusty inside.

KrautKoffin · « **Reply #1 on:** November 07, 2013, 03:18:01 PM »

Got a picture of your frame?

Djfob · « **Reply #2 on:** November 07, 2013, 04:30:20 PM »

Rough cuts done with a cut off wheel. Had to shave over 1/2" off both sides of frame. I'll be welding flat bar back in place.

BPellerine · « **Reply #3 on:** November 07, 2013, 06:36:44 PM »

could you get a right angle fitting on there and run an inline fuel tap?

Djfob · « **Reply #4 on:** November 07, 2013, 08:12:49 PM »

Quote from: BPellerine on November 07, 2013, 06:36:44 PM

could you get a right angle fitting on there and run an inline fuel tap?

Is there such a thing as an inline petcock? This way I can run a fuel hose right off the tank bung.

faux fiddy · « **Reply #5 on:** November 07, 2013, 11:43:02 PM »

You can get inline petcock and filters at ace hardware in their mower section. I always thought about plugging a 450 and using the equalizer tubes. Might have problems when low on fuel.

Does that one have a filler on the side or in the middle? It looks like it's not all beat to heck.

Djfob · « **Reply #6 on:** November 08, 2013, 08:32:51 AM »

The filler cap is in the middle but yeah the tank is a 10 footer but not too bad at all for a 40 year old tank. This is off a 72-74? Cl450.

I'm still looking for decent shape pre 71 as the tank doesn't have an oval shape.

So easiest/cheapest solution is to run inline petcock but best solution would be relocate to retain reserve function.

Djfob · « **Reply #7 on:** November 08, 2013, 08:35:51 AM »

Running fuel lines off both equalizer tubes could also work. Join them up at a T then fuel filter to carb.

MCRider · « **Reply #8 on:** November 08, 2013, 08:50:48 AM »

Looking good. AS long as I'd been in the Honda shops I was told, Oh yeah, the CL450 tank fits right on.

Well, we both know that's not quite right. I figured if I ever got around to mounting mine, I'd modify the tank rather than the frame. I know a real good tank shop that could make one from scratch, so I think they can mod one to fit. I really like the look, though it does leave the tang showing between it and the seat. Unless you make the seat longer in the front. But if the look is for a lean bratty style, just leave it showing. FYI for those who may not know, the front rubber bumpers do fit right on and it appears the extension on the rear tang will fit the stock CB750 hold down rubber. But Dj can attest to that or no.

The look from above shows a lot of engine.

BPellerine · « **Reply #9 on:** November 09, 2013, 04:44:47 PM »

yes looks nice from above a 360 tank fits much the same way and looks cool as well.bill

Djfob · « **Reply #10 on:** November 09, 2013, 05:53:41 PM »

It was easier/cheaper for me to modify the frame to fit. Love the look of this tank, reveals the engine alot more.

The rear cl450 rubber mount lines up with the cb750 frame.

Djfob · « **Reply #11 on:** November 09, 2013, 06:04:53 PM »

Quote from: BPellerine on November 09, 2013, 04:44:47 PM

yes looks nice from above a 360 tank fits much the same way and looks cool as well.bill

I'm looking at a 75 cl360 tank right now, looks smaller and cap on the right side. Is it smaller then the 450 tank too? The rear tang seems larger.

I may try this tank out since the petcock is on the left side. maybe the simplest fix to my original problem.

BPellerine · « **Reply #12 on:** November 10, 2013, 11:29:31 AM »

the 360 tank will fit on the front mounts and is a little longer but still requires some work at the rear to sit right looks better imo than the tank you have. the earlier 450 tank is much nicer .you may still have petcock issues but there is no crossover fuel line to deal with.bill

Djfob · « **Reply #13 on:** November 10, 2013, 04:21:10 PM »

The cl360 tanks I'm seeing have the crossover unless you mean cb?

I also prefer the look of the earlier cl450 tanks but harder to come by in decent condition. Don't really like the oval look of the late model

BPellerine · « **Reply #14 on:** November 10, 2013, 08:12:13 PM »

cb 360 twin tank 75.bill just do a search

BPellerine · « **Reply #15 on:** November 13, 2013, 05:16:14 PM »

360 tank pic.bill

martin99 · « **Reply #16 on:** November 14, 2013, 02:27:40 PM »

Actually I really like what you've done there DJ, that side-on pic is very reminiscent of an old Panther stroker which IMO is one of the best looking bikes ever. In fact the more I look at it, the more I like it

Shame about the petcock issue, hope you figure a way round it.

754 · « **Reply #17 on:** November 14, 2013, 02:34:33 PM »

There is. Inline petcocks they have little red handles. You can make a hose barb to fit the stock outlet , or plug that and use the crossover tubes.

Djfob · « **Reply #18 on:** November 14, 2013, 09:10:25 PM »

Quote from: oldskoolnuts on November 14, 2013, 02:27:40 PM

Actually I really like what you've done there DJ, that side-on pic is very reminiscent of an old Panther stroker which IMO is one of the best looking bikes ever. In fact the more I look at it, the more I like it Shame about the petcock issue, hope you figure a way round it.

Thanks! I'll figure out a way to make it work. Last resort would be to move the petcock for now. It's winter up here anyways do I've got a few months to figure something out.

Does anyone by chance know the thread pitch/size of the cl450 petcock?

754 · « **Reply #19 on:** November 14, 2013, 10:00:01 PM »

Measure using wrenches..it will be METRIC, and use bolts you have around to measure the pitch.
I am guessing 14 or 16 x 1.25...

MCRider · « **Reply #20 on:** November 15, 2013, 06:37:31 AM »

There was / is a forum member that has a CB750 Turbo in blue, that uses a CL450 tank. Looked good, But I think he was running without frame tubes to make it work.

:blue71turbo"

About halfway down:
http://forums.sohc4.net/index.php?topic=129580.msg1454842#msg1454842

754 · « **Reply #21 on:** November 15, 2013, 07:36:30 AM »

He is running without the tubes cause someone cut them out, I thought.

MCRider · « **Reply #22 on:** November 15, 2013, 07:40:56 AM »

Quote from: 754 on November 15, 2013, 07:36:30 AM

He is running without the tubes cause someone cut them out, I thought.

I don't know which was the reason for what. IF the tubes were cut to accommodate the tank... or were cut to accommodate engine work and coincidentally allowed for the tank.

Old Scrambler · « **Reply #23 on:** November 15, 2013, 07:00:34 PM »

The SL350 tank will fit...........a little different each year and the '72s are aluminum. The CB500T will also fit, holds more fuel, and has knee-indents.

KrautKoffin · « **Reply #24 on:** November 15, 2013, 11:00:21 PM »

Quote from: Old Scrambler on November 15, 2013, 07:00:34 PM

The SL350 tank will fit...........a little different each year and the '72s are aluminum. The CB500T will also fit, holds more fuel, and has knee-indents.

Got pics? What year cb500t?

Djfob · « **Reply #25 on:** November 16, 2013, 08:20:40 AM »

Quote from: 754 on November 14, 2013, 10:00:01 PM

Measure using wrenches..it will be METRIC, and use bolts you have around to measure the pitch.
I am guessing 14 or 16 x 1.25...

Thanks!

Not exactly sure of the thread pitch but I found a fitting that I'm going to try. Its a m16 x 1.5

Djfob · « **Reply #26 on:** November 26, 2013, 03:30:54 PM »

Swapped to a earlier cl450 tank. Less of an oval shape and colour/original patina gives the bike a nice look.

Bung is is m16 x 1.5, still working on getting it to work since the barb doesn't clear the carbs either. Having a hard time trying to get my hands on an elbow. That would clear for sure.

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Author Topic: CL450 gas tank on 78 cb750k (Read 4361 times)