SOHC.co.uk Forums > CB750

Jetting?

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JamesH:
So to clarify, you’ve fitted 130 mains, adjusted the idle screws and all is well on your K1 running open bell-mouths? Did you get someone to set the bike up for you on the dyno in the end..?

Arch stanton:
No. I just got my Mechanic John Carr to go through everything. In order to give it a final set up after building the bike over winter. I didn't open the engine as it appears to be a very good one.
I was pleasantly surprised how easy to set up it was.
The differences between the F1 & K1 have been pointed out to me.
But from what I remember. The K1 is riding quite similar the the F1 I did 50,000 miles on many years ago. With the very same set up. Though the F had a 3/4 Rickman fairing.
I think I will be quite satisfied with it.
By the way.
John Carr built the Honda that Alan Jackson won the first 3
World formula 2 World Championships on. + was awarded the Shell oils Mechanic of the year award at the TT around 1982. He knows his stuff.

MarkCR750:
I had my 750 sohc dynoed a couple of years back, K6 engine we think!, fuelling was good above 3k revs but a bit lean below, I have a 4 into one (piper pipes and generic reverse cone silencer) and pod filters that I grafted onto the original velocity stacks from the Honda air box, I fitted 135 main jets and left the original pilot jets in,  the dyno guy (Sam Ermolenko, google him) said at the time that the silencer was stifling it a bit, at the weekend during a bored moment I drilled some bigger holes in the baffle plate, the result?, it’s gone very lean, like white plug tips lean , oops!, so I just ordered some #40 pilots, this is with PD41A carbs by the way, now I know when I fit them that everything is going to be absolutely perfect and anyone saying different is just plain wrong :), one thing I noticed when setting the float heights is that even if you set them carefully you get variance in the fuel levels across the carbs so I will be using the clear pipe on the drains method to make sure I get them all correct and the same, I have never removed pressed in pilot jets before, does anyone have any tips?, bit of heat?, pull with pliers?, new ones in the freezer before fitting?, all advice greatfully received:)
Here’s mine on the dyno
https://youtu.be/dzyp3A1TQBY

SteveD CB500K0:
I hope you had a set of ear defenders on as well!


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MarkCR750:
Pardon?

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