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04-14-2019, 12:35 PM

#40130

Jesse Open

Join Date: Mar 2018

Location: 30 Miles North of Canada Border

Posts: 3,788

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Original early style FA-65 carb with broken NVA removed. Note small, black window, next to brass at 2 O'Clock. This is the fuel entry port that accepts metered fuel from NVA. Also note threads stop just above that port. About 2mm below surface. This is as deep as you should thread the valve upon assembly.

Comparison between the donor needle body from an early FA-120 "Fathead" with the remaining portion of the original NVA. The 120 body does not have the metering hole;the 65 part does. We will need to somehow get that metering part into the 120 needle body!

View from the carb body side of the 120 needle body. The ID is .129"

Here is a view inside the 65 orifice, from the needle side.

Brass mandrel to hold the 65 orifice end for turning to part it and reduce the diameter to .127"

Tack soldered in place

Diameter turned and the metering "pill" with the orifice in place is parted from the old body.

Here is the "pill" just before pressing into position for sweat soldering

Soldered, nearly done!

Freshly repaired OEM early carb, ready to run. Donor parts were: Needle from FA-65 carb rebuild kit, needle body from early FA-120 and the original metering orifice from the early FA-65 carb.

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