SOHC.co.uk Forums > CB750

Top Speed

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Jack:
I rode the bike for the first time when I took it for it's test, which involved a ride down the A1.  It rides fine up to 65-70 mph but then just seems to fizzle out.  I must admit that the old bike was not filling me with the desire to push it much harder anyway, it was starting to feel decidedly vague in the handling department and I'm sure that from 70 mph the braking distance could be measured in minutes not meters ( and that is despite having three discs ).

I was planning to sort the carbs with a good clean out and then new floats and float valves, aswell as new main and idle jets. The ignition is of the points type but is all brand new, as are the spark plugs.

I'm pretty sure though that it is running far to rich - it will start from cold with no choke!!! ( If I put the choke on at all it promptly floods ). I have the mixture screws set at 1 1/4 turns out but it doesn't seem to make much difference what I set them at to to be honest.  The chokes themselves are all operating as they should as are the slides, so all in all the carbs are the prime suspects.

Even after taking into account the handling and brakes and any number of other little quirks that the bike displays, it still puts a smile on my face, and I did notice that the sport bike brigade took much more intrest in my old bike than I did in their shiney new machines. To that end I just want to try to get it running as good as I can.

Jack:
Sorry all my computer just freaked out on me and posted twice.:blink:

dunner:
had mine to 122mph. scared the hell out of myself
so i backed off
:evil:

dunner:
had mine to 122mph. scared the hell out of myself
so i backed off
:evil:

Asimohonda:
:) Mmmmmmmm thats more like it! So much for a so called Classic Bike comic claiming 112 mph was about top whack! \"eat my jet fumes\"My first CB750K2 which was bought \"secondhand\" topped 125mph with a \"standard\" engine My first & only Brand New bike CB750F1 also did about the same in \"standard trim\" although the ecceleration was far better.My current F1 has a lot of tuning/go faster engine bits & pieces inc sprocket/ & gearing changes I tried it when I first recommisioned it after a 10 year lay up & it was totally \"standard trim it went over the \"ton\" quite easily I,m hoping for a whole lot more from the engine mods I have made otherwise I,m going to be very disappointed :)regards Asimo

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