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1977 CB750 rebuild

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SoonerJoe

1977 CB750 rebuild

Hi guys, I recently acquired a basket case 77 cb750 for 150 bucks. it was last tagged in 83 so i was only ridden for 7 yrs before someone broke off some spark plugs, removed the exhaust, and let moisture sit in the cylinders for 28 yrs. Anyways, i somehow got the motor out of the frame and tore it down. I was impressed with the brand new oil that came out of it, great looking bearings and factory cross hatch on the parts of the cylinders that were not rusted. Now to the point, i'm going to take the cylinder jug down to my favorite machine shop and have it bored first oversize. What size to i need to tell my shop to machine the bores too? Also, can i use pre-77 pistons and rings since i need to buy oversize? it's hard to find the 77-78 ones.

TOOLS1

Re: 1977 CB750 rebuild

Administrator

Need to know if it is an F, or a K model. F models had a different cylinder head which had less compression. If I were you, I would get an 850cc kit from cycle-x. Complete kit is only $240.00
Keep us informed on your progress, and how about some pictures?
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)

SoonerJoe

Re: 1977 CB750 rebuild

It is a K model. I know the three c's of power... cam, compression, and cubic inches. But i'm not really looking for something reliable and fun. I've found in my travels that when you start adding power other things start to break. I was just thinking a .25 over lit from cycle x.