More VC625 carb voodoo/experimentation

[slonomo]

Originally Posted by oldphart

Thanks! I'll go back to being cranky and baffled.

Shop reefer is full of Bud. That helps....

Jim

You shouldn't say "reefer" and "bud" in the same sentence

[oldphart]

Originally Posted by slonomo

You shouldn't say "reefer" and "bud" in the same sentence

Those were the days.....

I'll stop there before I incriminate myself further.

Jim

[oldphart]

Back at it again. I took a calipers capable of measuring depth and verified that (for sure!) the needle is at least 1mm + from seating fully in the jet. I can't cut more threads on the needle because it's an oddball thread that isn't in my set (4mm x 80). The jet that came with the adjustable needle is about 2mm/.080. What if....I opened an extra stock main jet up to something less than that and tried that? Say, 1.5-1.6 mm? The smaller hole will take less travel of the needle 'up' to bottom out.

Opinions? Ideas?

Thanks!
Jim

[Shepard]

Here's an idea that I have used -- I've used a brass flat washer salvaged from a old needle jet and shimmed the main jet down closer to the needle. You could make a shim spacer on a lathe if you have access, just don't use steel.

Drill the main jet to 1/16" or .0625 unless you have smaller drill bits -- if you had a .050 drill bit that would be better. A big jet for a Ruxin carburetor would be in the .040's range

[Shepard]

Here's a few pictures of the experimental work I've done that works.

[oldphart]

I found some perfectly sized brass washers to use as spacers at McMaster-Carr. Gonna' try that in the next day or so. Your nice knurled mixture screw sure makes mine that I soldered 1/4 steel tubing on look humble. Nice work!

Jim

[slonomo]

I think you can buy that little brass knurled screw.