Honda-SOHC

Maybe we should credit the chap that now owns the letter, it is William Moss.
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I know the bulletin about battery vents dropping acid on chains is in one of Ash's places Julie but that is the first time i have seen the letter, i think i will print it and put it in the bulletin folder i have as long as its ok by you

Our valued sohc member K2-K6 uses what I perceive as an unusual Syntax style in his posts.
They are authoritative presenting replies that are always interesting as well evidenced and thorough.
At the risk of sounding critical I have often wondered if English is his first language, mine wasn't as I lived in Austria during my early childhood moving to the UK permanently when I was 5 years of age.
This post is intended to be complementary not in any way a criticism. It might be that K2-K6 is a University  Mechanical Engineering Don who loves old Honda's.

I’ve never been so insulted

Can’t drink that, it needs more tea in it!


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Quote from: McCabe-Thiele (Ted) on September 09, 2024, 12:08:08 PM

I am not advocating this as an answer Mike - if you are running the standard air cleaner system there are adjustments that you could make with the needle rather than changing any jets - raising all four  needles on the sliders would richen the mixture at any given throttle opening. (i.e.one groove lower than the mid point effectively raising the needle in the jet)

There must be a reason why they put five grooves in the needle - might be for those living at high or low altitudes.

Its indolvable Ted as its not the jetting doing this.

Its too high a ratio for the torque available to pull, but if you sent it downhill in that gear (removing some resistance effectively) then it would carry on rising in revs.

Raising the needles will just make it rich for all of the general running scenarios other than this one. It's set correctly as it is.

Needle adjustment is there for scenarios you described though, primarily altitude. It would also be unacceptable to produce a carburettor with no adjustment too, then expect a long service life out of it. It just must have some level of compensation built in to cover reasonable eventuality in its usage.

Love your techy explanations Nigel. I now understand CV carbs more.