some hesitation at coasting

[reidalpine]

Hi all! I'm experiencing a little hesitation (stumbling) when coasting -especially in higher gears..
it only occurs when I'm just "holding" it at speed -Not on accelerating.
Can't say pulling out choke makes it better either...

-Would enrichen by the mixing-screw be the right place to start?
Upon adjusting I think it was set at poss. too low figure (under 1,5% Nox) if I'm not wrong

I've also mounted a K&N air-filter to the dual carb (Weber Dir 32-32) so maybe emulsion-pipe
could be suspected to be too lean too ??
I'd like to change one item at a time so as not to confuse myself unneccessary -Easily done
I'm afraid!

Oh yes -motor is C2JP 7-13 1397cc 5TX

-Hope you guys are having a GOOD time out there! -Reid.

 

[reidalpine]

Paul?! Paul!!-if you don't come out from where you're hiding soon you Will stay there till midnight and No din-din at that ..you hear?? -Reid.

 

[mr-reno-139]

This forum doesn't work like facebook where mentioning my name tags me in a post ☺
The wonder of the wifi in hotel means I can answer easy questions but all the variables of making guesswork means too much typing and thinking
However if you want to pay my expenses i am happy to come and have
A look ☺

 

[angel]

Don't bother with idle mixture screw, does not hava any effect at part throttle.

Emulsion tube is a good point to start, but a bit of a guesswork deciding on which is richer or leaner at that particular point.

Depending on what you mean "cruising", idle jets may or may not have an effect on mixture.

 

[reidalpine]

Hi there Angel! Hope all is well with you down Athens.. Tested some more today and it seems this hesitation occurs in all gears
-a little worse in 4th and 5th. When brought up to chosen speed and I let of throttle,so as just to maintain speed it stutters
and feels lean.I'm talking mid-register rpm's Don't really have a clue Actual rpms, as tacho hasn't been mounted yet.

Installed a small reducer today as only front sports-muffler made it sound like a kamikaze-jet especially on decelleration-Lots
of blaring and some backfiring.. Much better now,no backfiring just deeper throatier sound on acc.. -Reid.

 

[reidalpine]

after installing that small reducer near to end of exhaust-system hesitation seems somewhat better but still not all gone
-could it have been kind of a suck-out or what?

I guess getting you Paul over here to have a look-see woud be out of my budget as I hear you're high maintanance when
moving amongst normal humans ?? (like the Phantom-All heard of but seldomly seen) -Reid.

 

[angel]

Try a slightly larger idle jet if you have one, for a start.

An AFR meter is invaluable for such situations. It has happened to me a lot of times to "feel" a hesitation as leanness, while in fact it was due to overly rich mixture, or vice versa.

 

[reidalpine]

Thanx again Angel. I noticed today new exhaust-pipe is very slightly blackish inside
-just kind of Dry sooty stuff, so you might be rigth in thinking rich mixture , I will recheck both Co and Nox-levels first.. -Reid