All 2st Mikuni tuning -

[rockdancer]

View attachment 4604

Took a leaf out of PV dukes book
Took the day off and ride some great tracks around the Glass GHouse Mtns - Near Australia Zoo.
Beautiful clear and crisp autumn day Temp 18 to 20 deg C
Tracks everywhere and none else around

Previously my running too rich and lacking power at times
Older Mikuni TMX Running 380 main 35 pilot .
Adjusted power valve nut to top setting
Raised clip to second to lean mixture

Goes hard . Good power hit - rips.
Chugs up hills well.
Only occasional lean bog on and off throttle - not too bad
Could live with it as I like the top end and spend a of time there

Will a thinner needle tip and thicker at top help to reduce that lean bog or will a richer pilot be worth a try? Any specs on possible needle
Or does this just become too rich?
(Not viable to get Keihin for a while and you know what i reckon the Mikuni looks better )
Cheers RD

 

[Bill502]

What needle do you have in there?

 

[rockdancer]

I think its the 60 . Stock . Spark plug is looking good maybe a little too light - hard to say.

 

[Anthony_1978]

View attachment 4604

Took a leaf out of PV dukes book
Took the day off and ride some great tracks around the Glass GHouse Mtns - Near Australia Zoo.
Beautiful clear and crisp autumn day Temp 18 to 20 deg C
Tracks everywhere and none else around

Previously my running too rich and lacking power at times
Older Mikuni TMX Running 380 main 35 pilot .
Adjusted power valve nut to top setting
Raised clip to second to lean mixture

Goes hard . Good power hit - rips.
Chugs up hills well.
Only occasional lean bog on and off throttle - not too bad
Could live with it as I like the top end and spend a of time there

Will a thinner needle tip and thicker at top help to reduce that lean bog or will a richer pilot be worth a try? Any specs on possible needle
Or does this just become too rich?
(Not viable to get Keihin for a while and you know what i reckon the Mikuni looks better )
Cheers RD

i didn't know the powervalve was adjustable

 

[rockdancer]

Ok - Had to report that I am very happy with the way the Mikluni is now running

I was running a 30 pilot jet and had occasional bog from closed throttle
Tried a 37.5 pilot and this was too rich - felt dead .

Put in a 27.5 pilot jet and bingo - happy days .. Go figure. I thought it was a lean bog but leaner jet made it better
So crisp and pop the clutch and front wheels lifts easily in gears 1 to 3
I also adjusted the power valve bolt to be 3/4 up . Was all the way up before.
This is also better as it seems to open power valve earlier and gives more bottom end.
Not such a light switch.

Its amaizing what difference a couple of things can make to how a bike feels .
Also had a new back tyre on and the thing was trying to flip on the hills!

I had a couple of speed tests with an 08 TE250 from a rolling start and it was neck and neck and he was bouncing of the rev limiter.
It was also at least as quick as a TM 250f.
Now a happy boy