SOHC.co.uk Forums > CB750

CB750 K1 Valve Timing Question

<< < (7/10) > >>

K2-K6:
Just thought of another key aspect of the carb idle setting routine.

Although written in the sixties, it will take account of fuel difference including any formulation changes and ethanol content.

It's using the fuel you have in use to properly calibrate the whole low speed running ability on these engines.

Very clever  ;D

cbxman:
Nigel,

Thank you for your in-depth analysis of what is going here.

Yes, the procedure should make allowances for varying qualities of fuel, bearing in mind these bikes were sold all over the world.

Interestingly, Hondaman on .net has written about how the ethanol content, that Mr Honda was probably not planning for, has affected the way ethanol alters the burn rate and temperature.  He suggests that the main jet emulsifier holes which have two different diameters, the smaller ones should be drilled to the size of the upper ones....I think.  Opening the holes up allows more air to the mixture without reducing the fuel rate through the main jet....I think.....

As I am lucky enough to live in an area where the premium fuels are slated as having no ethanol in them, I will reserve judgement.

Anybody seeing this information should check very carefully before altering their emulsion tubes.  They seem to be quite scarce items.

Cheers,

Jerry

SteveD CB500K0:
Where in Suffolk are you Jerry?
We are all on the way.

Actually, I’m there already as mother-in-law lives in Woodbridge.

Berkshire Superunleaded is 5%


Sent from my iPhone using Tapatalk

cbxman:
Steve,

I'm very near Needham Market.

Jerry,

K2-K6:
Jerry, do you have a link to the hondaman thread about ethanol?  I'm interested in reading it but couldn't readily find it on that forum.

Thanks, Nigel.

Navigation

[0] Message Index

[#] Next page

[*] Previous page