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scott

Mikuni Settings For A L24

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Recently picked up a set of 44 triples and currently rebuilding them. Was going to wait to put them on a L28 but i'm pretty keen to chuck them on my L24.

They came with

 

Main-160

Air- 240

Pilot-65

Pump-55

Choke-37mm

 

Kameari suggest

 

Main-150/170

Air- 200/220

Pilot-55/57.5

Pump-40

Chokes- 34/36

 

Anyone else run 44's on a L24 before? Do Kameari specs work as a good starting point?

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That set up would be too large on choke and too lean.

I'd also expect it to bog down when you pump the accelerator, due to pump jets being too large and making it rich.

Looks like it's come from a pretty warm motor.

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This is some info I had on my phone from when I was researching my tune.

 

44mm carbs

34mm venturis

150 fuel jets

210 air

57.5 pilots (1.5 turns out)

1.8 needle/seat

45 pump jets

 

o    Pilot Jets: 20% throttle = idle = low end power

o    Main Jets: Adds (or removes) fuel from the entire RPM range = higher number equals richer mix = top end power

o    Air Jets: Smaller the Air Jet the higher the RPM and the more fuel comes in = higher number equals the leaner mix

o    Power on Air Jets: Power on lower RPM band = 210/190 air jet

o    Power on Air Jets: Power on higher RPM band = 140/150 air jet

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Hi Scott,

 

I have just recently fitted 44's to my L24. Based on my experience with my engine only I would agree with Luvemfast your carbs current choke and jetting is most likely closer suited to a larger engine capacity.

 

I have 34mm chokes in mine which offers very smooth progression.

 

My jetting is currently:

 

Main Fuel - 150

Air - 200

Pilot - 57.5

Pump Nozzle - .45

 

Under load and WOT I am still too rich, so I have just been supplied 145 and 140 main fuels along with 190 and 180 main airs as my A/F ratio currently leans slightly the higher the RPM, while being too rich. As mentioned in my build thread I will have the car on the dyno in a few weeks to tune properly at the moment I am just working to get it close. I will let you know on the weekend how these new jets go and what combination I end up with.

 

Below is a link to the Mikuni suggested base line jetting for various engines including an L24 with 44's, hope it is a help.

 

http://www.mikunipower.com/PHHCarbs/PHHcatalog29.jpg

 

Billy

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Spent a bit of time tuning today, finished up with 190 airs and 140 main fuel. WOT under load is pretty close to around 12.5:1 A/F ratio and around 13.5:1 at cruise. That is probably as good as I will get it myself as a base line so its off to the dyno now. Will update once I have had it tuned properly.

 

Billy.

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Had the car on the dyno getting professionally tuned yesterday, ended up with the following:

 

34mm chokes

Main Fuel - 140

Air - 200

Pilot - 57.5

Pump Nozzle - .45

 

Hope this helps, good luck.

 

Billy

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