Topic: 1975 cb750f pitting in cylinders.

[mechanic3]

After approximately 2 years have had a chance to get back to my cb750f project. It sat in a building for about 18 years not touched. Shows 7000 miles? Changed the oil and filter,points cleaned carbs (a real mess.)new plugs and set static ignition timing. It fired right up and runs. After a few times running did a compression test. All cylinders around 140 psi. I then pulled plugs and bore scoped cylinders. Found quit a lot of pitting. Does not look good. Do you guys think its worth putting on road in this condition or am i into an overhaul? Any help would be appreciated.

[danyo]

Run it without worries now. Compression looks good so why to worry now.

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[PeWe]

140 PSI is not bad for a stock CB750.
If all 4 have same value = good.

Cruzinimage.net has cheap piston kit for future upgrade like +0.5 mm pistons.

[carnivorous chicken]

If it ain't broke...
Run it.

[PeWe]

Not smoking oil is another factor. Valves + seats with  guides and seals affect compression readings and eventual oil smoke.

Smoke from rear wheel when twisting the throttle is good too!

[mechanic3]

Thanks guys. Just wanted your opinion before spending money on tires. I think i will give it a go the way it is. Very much appreciate your help