Unseizing A Motorcycle Engine - Barn Find CB750 EP3

Рет қаралды 137,397

2 жыл бұрын

Unseizing A Motorcycle Engine - Barn Find CB750 revival! The $100 barn find CB750 takes a big leap forward in this video as I work to unseize the engine which had sat for years without spark plugs exposed to the elements. It appears that cylinder 1 and 4 had a bit of rust holding the piston rings to the cylinder walls causing the engine to be stuck.
After soaking with Marvels Mystery Oil for a while I tried working the engine loose and was successful after a few "polite" taps with a hammer on a long prybar. Look for more on this project in the future!
Bore Scope Camera used (Amazon affiliate link where I get a small commission if you make a purchase):
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UPDATE 2/28/22: See the bike running!
• CB750 FIRST START IN 4...
UPDATE 6/6/22: Full health check up. How about those compression figures!
• Barn Find CB750 Health...
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#brickhousebuilds #cb750 #unseizeengine

Пікірлер: 434

@billh4301 2 жыл бұрын

As an ex Honda tech that has rebuilt many of those engines I don't know why you wouldn't want to do at least a top end tear down to clean/replace rings/valves etc?

@malachiwhite356 2 жыл бұрын

I find motorcycles of this period better looking than today's machines with all their plasticware. Anyone else?

@robedmund9948

If that motor has been sitting for a few years, letting it sit and soak in that Marvel for a few days is a no-brainer.

@Fallen608 2 жыл бұрын

My salt for living in a country that never sold the CB750 and therefore will never have cheap old ones for me to pick up is eternal. Somebody send one to my country pls.

@livewire.. 2 жыл бұрын

I have successfully unseized multiple old engines. My favourite "additive" is a 50/50 mix of auto transmission fluid and carb cleaner. It still may take a few days but it works unless there is some serious damage to the engine internals.

@dusterowner9978 2 жыл бұрын

I never see any try evpao-rust .

@mattkayem1554 Жыл бұрын

I thought opening up that engine, cleaning and rebuilding it would have worked better but I've read somewhere in earlier comments that you didn't have time to do it. Awesome job restoring it though, I've pretty much watched most, well, a few of the videos around this bike

@stephenphillip5656 2 жыл бұрын

I was wincing & cringing when you barred that seized motor round. Thankfully nothing sheared & possibly you'll have a runner by now.

@everready19373 2 жыл бұрын

Sell that bike to me!!

@martinflanagan2506 12 сағат бұрын

Maybe a strap wrench and length of pipe instead of 2 prybars less chance of any damage. Allways enjoy your video's. Keep them coming.

@aunizlyliving2841 Жыл бұрын

I inherited one of these from my grandfather in the last week ago or so, parked since 90/91. Your knowledge and resources are beyond appreciated brother.

@skakpedersen 2 жыл бұрын

Lubricant + time + patience. Great combination, and pure heaven for this old CB. Thanks for sharing 👍

@tim.iteland.9447 2 жыл бұрын

Heating up 0 50w engine oil to smoking temperature , then carefully pouring down the spark plug holes is an old guys tip , it does work miracles (: great vid , that cb750 is awesome base condition .

@BrickHouseBuilds 2 жыл бұрын

UPDATE 2/28/22 the bike is now running! See it here:

@MarcusCreates 2 жыл бұрын

Another super video. These just keep getting better and better. Keep ‘em coming.

@philtucker1224 2 жыл бұрын

Great that the previous owner found the title so I hope you both benefit from that. A beautiful bike, I remember their first launch and how they ultimately became touring legends. 😊🏍

@brianwells5258 Жыл бұрын

Another series I binge watched over the weekend...!

@wyliehorn1568 Жыл бұрын

I love your patient, methodical, approach. Great job!

@waterboy8999 2 жыл бұрын

I remember seeing a yellow one of these in shop in 1976, I was 15 and it was so beautiful!

@fantared5263 2 жыл бұрын

A 50ml plastic syringe with clear tubing attached is good for squirting oil into cylinders and sucking it out. Also handy for bleeding brakes. And don’t remove the foil when opening a new bottle of brake fluid. Punch 2 holes 180 degrees apart on the outer edge (1 pour 1 breather) and it makes pouring and topping up much less messy. Guess who just rebuilt their brakes ? ;-) Thanks for the video.