SOHC.co.uk Forums > CB750

Engine Durability

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Bryanj:
Cam and primary chains if it has not been looked after otherwise not much except that all the rubber bits are old and hard---dont we all wish---

Waggles:
Agree with all the previous. 100,000 miles + is possible if well looked after and regular oil changes, only problem is you won't know how a 50,000 miler has been treated. Go for one with as low a mileage as you can find ( Waggles, specialist subject the bleedin obvious ) and as long as the chains seem OK ( no untoward noises ) you should be OK. Try to guess the way the motor has been treated by the rest of the bike.

My F1 is low mileage ( nearly 8,000 now! ) but is used everyday ( for 2 years ) and I find it an extremely practical and reliable bike. I have to say I am a confirmed F1-o-phile as I prefer the looks ( but know I am in the minority there and I do covet four pipes! ) and she performs like a K0, only thing I would say is as there are far fewer F1s around some parts ( like front brake caliper ) are now unavailable as there is less demand than for say a 400 four where they have been remanufactured.

I have seen a few 750s with around 20 - 25,000 on the clock so if you are lucky ........

rbt1548:
Thanks for all the help!
Cheers

Bryanj:
Just to reconfirm, I worked on a 125,000 mile old K where the bores, pistons, rings, crank and shells were all in spec, chains had been changed at 75,000 when a gear problem occured and was only stripped as the numpty had let the cam chain rattle a lot so it had eaten through the sides of the cam chain tunnel in the barrels.

Reson we knew the history is that it was originally the owners(of the shop) bike and he had serviced it for all its lift until the last numpty

steff750:
 ;) I have also got to the stage that id rather ride than rebuild ,back in the carefree seventies a lot of the bikes where run into the ground, so if its running now then you got a good one,I have seen loads of seized cams and knackered engines, i have lost count how many I have stripped for spares over the years
       one of my ko's is coming up to 55,000 If I can see 100.000 miles on that one without putting a spanner to it I will be a very happy bunny ::)

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