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From the looks of it yes it is. What I don't like about those is they screw up inside the main jet nozzle. I prefer a needle to screw up and seat on the nozzle giving you a definate stop and a more acurate point to adjust from which is the parts I sent you. While it was originally a Walbro needle the nut part was drilled and tapped to accept out HR tilly high side needle. Which like I said screws in and seats on the nozzle and not screwing into the nozzle.
George the questions I have is on some of the Nikki carbs the fuel transfer tube, you refer to it as the main jet nozzle, has two jets instead of one. How would the adjustment screw/needle, at the bottom of the bowl, be effective if there are two jets
The two brass tubes that fit up in the fuel transfer tube, are these for venting or does the fuel actually travel thru them? Also behind the the "nozzle" there is a rubber nozzle gasket that has a total of of six holes, actually two are closed off. Would it be beneficial for fuel flow to open those other two holes up?
I also noticed the choke butterfly was removed from that carb, does this increase the air flow substancially?