SOHC.co.uk Forums > CB350/400

cb400-four speed.

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scifi:
Hi All, I am a bit underwelmed by my 400-four's top speed.  I thought they were capable of 100mph laps of the TT, .
I have a local one and a half mile straight road, and find that it is difficult to get more than 65 mph from the 400 either in 5th or 6th gear.
Is this as much as they do, because of the Sit Up and Beg riding position..?

I Also don't like the six speed box..  Need to change 1st to 2nd, to 3rd, to 4th, just to get up to 30mph in the village.  My old BSA could do all that in 2nd gear.

I am sure my old CB200 was quicker....   Any thoughts..

K2-K6:
The CB200 is much more of a grunty little motor and tuned more for that torque in low range, to quite good effect.

The 400 really needs to be revved out to get the higher end performance. Generally low torque but productive high rev performance.  Youd probably need to ring it right out to red line in forth before even thinking about fith if wanting to see how fast it'll go. It just won't reward early upchanged ratios with much in the way of ultimate pace.

You've got to let the four sing its head off for extraction of absolutely speed.

Johnwebley:
Never had a CB400,

remember these are early 70s bikes,

Your bike sounds like it needs a going over,

I think head on the tank,bum in the air it could do a ton,

The engine has been raced,enlarged to 460 by Mochek,

They were quick,

Sure you're not confusing it with the CBR400 Baby blade,or the VFR400?

Totally different bikes



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Mikep328:
IF you are going through the gears/shifting at, say 9k+ RPM and having trouble getting to 65MPH, the bike is clearly not running properly.  My totally stock 400F will easily reach 90+ on a level road while riding in the normal position.  Never tried it in a "race position" but 100MPH seems possible in a crouch.

SteveD CB500K0:
My roommate at Uni (1977) had a speeding ticket at 104mph on his std 400/4 on the M23.

Must have been the downhill bit.

He was really chuffed


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