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550f running rich?

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DomP:
I've not been on here much recently as been busy with work and family, strangely now the best weather is past us I feel I need to get my 550 out again.  I've mentioned before that ive been suffering with what I believe is rich running and I have a question but first the set up-

Standard 069a carbs fully cleaned with the correct jets/needles and in the correct clip position.

Airbox is standard but I have used a Honda 500 air filter as I am missing all the breather hose parts, as a result ive blanked the breather hose port off. 

Fuel is new, tank has been flushed and new tap and filter.  The cam chain tensioner has been adjusted as has valves and timing.

Now if I really am running rich could it be because of the slight airlifted modification?   I can't get smooth acceleration but instead a big flat spot until I hit 4k at which point is snatches horribly, this is the same when in neutral, I can't slowly raise the revs as it sticks at 2-2500 then races away past 4k.

Long shot but is there anyone near Herefordshire that is up for a tinkering session with coffee or beers?  🤞

Johnwebley:
Interesting issue,

Have you had the head off?

I live in Hereford,

I could help, have you got vacuum gauges?

Are you available during the week?

Send me a PM in a couple of weeks, as I am in Italy

John

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DomP:
Hi John, I've fully rebuilt the engine with a rebore by Bryan, are you thinking being a tooth out?  I did it by the book so I'd like to think not but never rule things out,  I'm not free in the week sadly.  Italy, nice!  We were in Brac, Croatia a few weeks ago which has some Italian influences.   I've seen you are in Herefordshire, ironic with the surname Webley😃

I've got a Morgan carbtune

DomP:
Oh and much appreciated John!

Johnwebley:

--- Quote from: DomP on October 09, 2025, 08:17:13 PM ---Hi John, I've fully rebuilt the engine with a rebore by Bryan, are you thinking being a tooth out?  I did it by the book so I'd like to think not but never rule things out,  I'm not free in the week sadly.  Italy, nice!  We were in Brac, Croatia a few weeks ago which has some Italian influences.   I've seen you are in Herefordshire, ironic with the surname Webley

I've got a Morgan carbtune

--- End quote ---
Give me a message sometime after the 23rd,

I can bring a 4 gauge carb tuner,

I also have a strobe,

Do you have a remote fuel tank?

We can have a play

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