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1980 Darmah Carb Tuning

Posted: Mon Jun 14, 2021 12:22 am
by killfile
Hey folks!
Thanks to everyone that helped me get my '75 860GT carbs better sorted. It's now finished on NorcalTT (500ish miles) and one MotoMelee(900ish miles).

I've now picked up a low mileage 1980 Darmah and I'm trying to get the PHF32(AD/AS) carbs sorted. I've completely disassembled them and have taken notes on what's inside. For the most part no surprises, #122 main jet, #55 idle jet, but the float needles are mismatched. The front carb was running a #250 float needle and the rear carb was running a #300. The #250 seems fine, but the #300 needs to be replaced. I'm assuming the #300 is incorrect as Steve lists it as typically being for PHM carbs in the store and that I should it switch out for a #250. Still being a bit of a bevel novice, I thought I'd mention this here as I have occasionally heard people mention setting up the rear carb different from the front. Thanks all!

Re: 1980 Darmah Carb Tuning

Posted: Mon Jun 14, 2021 3:25 am
by Craig in France
killfile wrote: Mon Jun 14, 2021 12:22 am <snip> ... I thought I'd mention this here as I have occasionally heard people mention setting up the rear carb different from the front.
Never heard the needle valves being different. Can't see why they would - one will flow more juice than the other, that's all.

Re: 1980 Darmah Carb Tuning

Posted: Mon Jun 14, 2021 5:06 am
by ducadini
The difference between the #250 and the #300 is just 0.5 mm , thus the latter is giving more flow.
Unless You're flat-out, not much difference for a bevel.
Of course float-hight has to be checked.

ciao
joseph