Topic: CB750K3 "getaway bike"

[willbird]

I traded some stuff for this bike back in 1993 or so. I do not yet have a title for it, will get to work on that. In this picture I had checked oil and seen tank was low, added oil and fired it up. As happens a lot the oil was in the oil pan not the tank so it had over flowed. I ended up stealing a lot of parts from it to rebuild my K2 back then and it just sat around. When I moved to my present house my wife saw it and nicknamed it the "getaway bike" LOL because it had a bare rear rim with no tire on it.

Way back then I do not remember noticing that somebody had lowered it a bit by sliding some fork tube up out of the triple trees.

My current plans are to get it running again then use it to work up a MicroSquirt controlled EFI and spark control setup. Seems to make sense to fire it up analog first so I need to get a points plate for it somewhere. I have a new 4 into one advancer that will work to fire it up.

I have a rack of carbs lined up from a forum member, the originals got some water in them that ruined carbs 3 and 4.

Found some water in the oil pan when I drained it so plan to drop the pan and look at oil pump, have an ebay pump to install if needed. Need to remove oil tank and have a good look at it too. I have an ebay oil tank if needed too.

Thinking about eventually stripping to the frame and painting the frame a matte finish gold and doing the body parts a matte black...it will not end up "stock" looking but no frame alterations planned...I want a running riding bike out of it with some kind of frame mount fairing if I can find something....more of a race type fairing than cruiser.

My K2 and original windjammer photo bombed this picture too :-).

Bill

[willbird]

Oh yea, and I still have the side covers but like a moron I discarded that tank....sometimes you could just smack your younger self LOL. I bought a tank off ebay that is beat up enough that it is no sin to modify it to a more modern fuel filler that is in a bold in plate big enough to be able to get an EFI fuel pump inside the tank.


Bill

[willbird]

removed oil tank and dropped oil pan today. One bolt had almost no room for a socket to get into the hex, had to lathe turn a 1/4” drive socket. no unpleasant surprises in the oil pan. dropped oil pump and installed new anti drain back rubber gizmo. want to find some socket head cap screws to use instead of the JIC that hold the cap on the anti drain back. tool relief valve apart and made sure it was moving freely.

pan gasket came off intact, cleaned the oil pan like new, scrubbed in some dawn dish soap and water first then finished up in ultra sonic cleaner.

Bill

[willbird]

Took oil tank to the car wash and rinsed it inside and out. Then some 70% rubbing alcohol. Then rinsed it several times with pump gas until that came out clean.

Bill

[willbird]

Got a used breaker plate with points and condensors from Ebay. Will have a new 4 into 1 advancer. Ordered a set of the 5 ohm coils that take plug in spark plug wires.

[willbird]

Got the alternator cover and transmission cover off today. Somebody had been in there before, no idea why. Some of the cover screws had been cross cut with a cutoff wheel for that individual to use a straight blade screwdriver. One screw was an allen bolt. Had to drill the head off one screw. The hard washer from the starter drive gear was missing. ordered a gear, shaft, and washer from ebay. I did ride this bike around with the plate from my K2 on it back in 1993 or so, it seemed to run fine. No idea why some PO had been inside this area.

[MauiK3]

A little buffing and it will be good as new!

[willbird]

A little buffing and it will be good as new!

Kinda trying to decide what direction to take there. I have a HF tank type sand blaster but currently only have coal slag media, not the best choice for aluminum because it has Iron Oxide in it. I have some ground walnut shells...big bag of them, not sure if it will feed thru the blaster or not.

[willbird]

OK first things first, the screw I drilled the head off of came out easily with ye olde vice grips. Removed oil filter housing, it uses a bigger hex center bolt than my K2.



One bolt on this cover was missing and the bolt hole was full of mud.

[willbird]

Ran parts in Ultrasonic with the Simple Green - SMP13406 Extreme Aircraft and Precision Cleaner, I want to make sure I do not run out of that stuff because it works GREAT :-).

Stuff is clean now.

[willbird]

made an aluminum plate to bolt up and seal like the oil pump does, it has a 1/4-18 NPT tapped hole to allow hooking something up and pumping oil through the filter and then through the engine, oil will then run out and probably make a mess despite trying to catch it. Will pull tappet covers off and look in there as oil flows and make sure oil is getting everywhere it should. I picked up a 12" long 2" pipe nipple and some fittings to make a container that I can put air pressure on top of the oil inside it to force it into the engine. 18" of pipe would hold 1 quart or pretty close but an 18" long deal sounded awkward. I have some Mobil 1 0-20 I will probably use to flush initially.

[willbird]

Also got bold and grabbed the alternator rotor and cranked motor over a few turns, seems fine. When I dragged it up from it's 20 tomb out back I kicked it once with the kick starter after pulling plugs and squirting in oil to see if it had tied up. Plugs are just finger tight right now. PO had if I recall right maybe 4 different types of plugs in it LOL.

Also grabbed a couple M6x1.0 Socket Head Capscrews for the oil pump stopper valve cover, had to grab the original bolts in the vise to break them loose.

[willbird]

Found a guy local who will vapor blast the parts shown for a lot cheaper than I thought. Dropped them off, will pick up tmw. They are pretty beat up so I told him in advance that I knew they would still look beat up after vapor blasting. Once they are done I will talk with him some about what grit to sand stuff to before vapor blasting for a good result. Should be able to pick them up tmw morning. He works days and I work nights. He would love to have more vapor blasting work though he said.

[willbird]

OK here are the port and bolt hole locations for the oil feed plate. The right hand hole is the oil pump pressure port. The bolt hole near it is slightly below centerline, difficult to know 50 years later if that was intentional or if there was some error in production. The dowels fit pretty snug so things have to be correct for all of them to fit when it bolts together, two go deeper into the pump than the third. The dowel by the oil pressure feed only slips into the pump a very short distance so the other two are really doing the job of aligning the pump.

[willbird]

Here are the engine covers after Ultrasonic cleaning.


Here are the engine covers after vapor blasting, I knew in advance that these covers were not perfect by any means, but this is the best they will ever look IMHO. The guy is looking for more work, if you need something I can put you in contact.

[BenelliSEI]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

[willbird]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

[newday777]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

It might yellow from the heat??

Get some Sharkhide to protect the aluminum from oxidation

https://www.eastwood.com/sharkhide-aluminum-protectant-quart.html

[newday777]

Otherwise plan to protect the aluminum with semichrome paste or White Diamond metal polish every 6 months to a year.

[willbird]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

It might yellow from the heat??

Get some Sharkhide to protect the aluminum from oxidation

https://www.eastwood.com/sharkhide-aluminum-protectant-quart.html

Wow they are proud of that stuff LOL, probably plus another $20 UPS the way they work LOL.

Bill

[newday777]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

It might yellow from the heat??

Get some Sharkhide to protect the aluminum from oxidation

https://www.eastwood.com/sharkhide-aluminum-protectant-quart.html

Wow they are proud of that stuff LOL, probably plus another $20 UPS the way they work LOL.

Bill

Naw
Amazon has it in a spray can

Sharkhide Aerosol Metal Protectant https://a.co/d/gRRjkPf

[willbird]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

It might yellow from the heat??

Get some Sharkhide to protect the aluminum from oxidation

https://www.eastwood.com/sharkhide-aluminum-protectant-quart.html

Wow they are proud of that stuff LOL, probably plus another $20 UPS the way they work LOL.

Bill

Naw
Amazon has it in a spray can

Sharkhide Aerosol Metal Protectant https://a.co/d/gRRjkPf

A mere $39 :-).

[newday777]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

It might yellow from the heat??

Get some Sharkhide to protect the aluminum from oxidation

https://www.eastwood.com/sharkhide-aluminum-protectant-quart.html

Wow they are proud of that stuff LOL, probably plus another $20 UPS the way they work LOL.

Bill

Naw
Amazon has it in a spray can

Sharkhide Aerosol Metal Protectant https://a.co/d/gRRjkPf

A mere $39 :-).

Well then polish away till yer heart is content.

[willbird]

Those covers look great. I did the same with the S/C. They go to the polishing guy next.

I have some 100% silicone spray, wondering if it would be good to spray them with that and wipe dry

It might yellow from the heat??

Get some Sharkhide to protect the aluminum from oxidation

https://www.eastwood.com/sharkhide-aluminum-protectant-quart.html

Wow they are proud of that stuff LOL, probably plus another $20 UPS the way they work LOL.

Bill

Naw
Amazon has it in a spray can

Sharkhide Aerosol Metal Protectant https://a.co/d/gRRjkPf

A mere $39 :-).

Well then polish away till yer heart is content.

I'll take your word for it :-). Threw down for a quart from the zon of am, it was the best buy per ounce I think. Sounds like a quart goes a long way.

Bill

[willbird]

Stripped the ruined carbs down to see what can be salvaged. Two carb bodies might work. Looks like 27201 needles lifted as high as they go with clip notches. PO had pods on it when I got it. It did run good the little bit I rode it then. Carb bodies are stamped 657A K1. No jets or jet holders when I exhumed it from it's slumber in my shed.