Author Topic: Unlocking '74 CB750 gas tank  (Read 2300 times)

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Offline 77379

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Unlocking '74 CB750 gas tank
« on: January 22, 2017, 10:26:08 am »
The other day while I was looking for some parts I ran across and brought home a non running 1974 750. Of coarse the gas cap was locked and the P.O. didn't have the key. Do these locking gas caps have one standard key to unlock them or are they all keyed differently? Are the keys readily available for them or is a drill bit the best way to go? Gregg

Offline Stev-o

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Re: Unlocking '74 CB750 gas tank
« Reply #1 on: January 22, 2017, 01:00:49 pm »
That is not a stock Honda lock, either find a key or drill it.
Appears to be a hex, can you fit a small set of needlenose in there?

The Honda lock works with any key [or a screwdriver]
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline 77379

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Re: Unlocking '74 CB750 gas tank
« Reply #2 on: January 22, 2017, 01:42:24 pm »
I couldn't fit any of the needle nose pliers I had in there. I'm going to round up some smaller ones and give that a try. If that doesn't work I'll go ahead and drill it out. I wasn't aware it wasn't a Honda lock.

Offline b52bombardier1

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Re: Unlocking '74 CB750 gas tank
« Reply #3 on: January 22, 2017, 02:38:41 pm »
You could knock out the mounting posts instead of drilling out the key slot. Then you can reuse the cap assembly someday.

Rick

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1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline 77379

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Re: Unlocking '74 CB750 gas tank
« Reply #4 on: January 22, 2017, 06:01:35 pm »
I tried to knock the pins out but the back one was pretty stubborn. It felt like if I hit them any harder something was going to bust off so I put the hammer down and hit them with wd40. After a day of soaking I'll go at them again lightly with the hammer tomorrow. Are those pins the posts that you are referring to?

Offline b52bombardier1

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Re: Unlocking '74 CB750 gas tank
« Reply #5 on: January 22, 2017, 06:56:22 pm »
A small drill recently helped me weaken those pins for removal on a tank I'm working on.  Replacement pin sets are available on Ebay and probably elsewhere and the replacements use small "C" clips rather than pins that are peened in place.  Much easier for future removal.

Rick
1971 School Bus Yellow Aermacchi H-D Sprint 350
1972 Candy Yellow CL100 K2
1972 Candy Jet Green Honda CB500
1973 Mighty Green ST90 K0
1974 Mars Orange CT90 K5
1975 Topaz Orange ST90 K2
1976 Shiny Orange CT90
2006 Honda Foreman 500 (restored)

Offline 77379

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Re: Unlocking '74 CB750 gas tank
« Reply #6 on: January 24, 2017, 02:38:50 pm »
Thanks for the advice. I cut the pins off with the dremmel. I'll be looking for some of those replacement pins on eBay. On an older model 750 I have they are just straight pins that can be punched about and reinstalled with the help of some wd40.