SOHC.co.uk Forums > CB750

F2 Engine

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Waggles:
....... or replaced under warranty with original screws refitted .........  ???
Bryan makes a good point though, you might want to check them out as its not in a frame, not a big job to see if they are OK and you would kick yourself if you found out they were shot once you put it in a frame

kifer:
I presume the valve guide problem is due to mileage and not standing, Only heard this over last few years, back in late seventies
early eighties had a couple of F2's thrashed and neglected big miles with no problems [ except a sandstone wall in the Isle of Man. ]
Would like to know more Cheers.

UK Pete:
I have seen untoched F2,s with 30.000 miles + still running ok with no smoke or noises, but then i have heard through forums that you are lucky to get 10.000 miles before they need work to the valve  guides,
Dont be scared off by all this talk , i think people only talk about worst cases, its almost getting the done thing to wright these engines off ,but when you talk to people with f2,s at bike meets and places there are many who are not on the forums and so are unaware of any issues.and have had no problems
 i spoke to a guy recently who has had no problems whatsoever, and he has owned 2 of them, both with higher milages than 30k, but as the others say do yourself a favour and check it out as the engine has to come out of the frame to get to the top end which is a pain in  the arse, if you do find your guides are shot then be prepared for a large bill unless you can do the work yourself
pete

Waggles:
To be honest I feel a bit guilty for posting that jpeg and inadvertantly adding to the 'F2s are no good' myth. If you read my original post it was more to get comments on rather than scaremonger as it seemed a bit excessive to me. I too knew someone 'back in the day' with an F2 and he had no problems. We can only guess at why guides have failed ( lower gearing causing higher revs, higher redline too if I recall correctly, more radical cam, dodgy batch of guides? ) and I guess we have no figures on how many so the 'check it out' advice still seems sensible.

Would I have an F2? probably not, but that is more because I am an F1 fanatic and don't like comstar wheels than it is any engine worries, if I came by an F2 I doubt I would sell it! Lets declare a 'Be nice to F2s' month, they are after all the fastest sohc 750s. Anyone with an F2 should post their mileage and whether they have had problems, smallish sample I guess but it might prove something.

kifer:
Thanks to all,  I think it is good to hear comments from both sides of the fence and I to are an F1 person, And sorry to some but not a lover of commie wheels,  As far as miles go I have had big miles off both models and I remember a lad in the early 80's doing best part of 80'000 before a major strip on his 79 F2.  Maybe there is some luck involved but I believe a bike in constant use mostly will produce higher miles with less trouble.
Sounds a good idea to find out what sort of miles has been had by the various models'
So over to you peeps out there.  Thanks again.  :-\

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