Paraquat wrote on 08/19/12 at 07:01:47:I bought jets for 5 or 6 bucks, shipped, off ebay.
Just go a day without coffee.
Unless you're trying to achieve a size that isn't listed. I do recall reading somewhere here that a 52.5 and 55 is offered but someone really desired a 53.5. Could try a set of pin gages to check the sizes and ream one to suit?
--Steve
I did that one. The 52.5 was too lean and the 55 was blowing black smoke. Bad thing was that I am a machinist without any decent tools for that. But being a machinist makes you improvise and I found a safety pin with was just the right size, didn't go in the 52.5 and fell into the 55.
Opened the pin up and ground the tip like a screwdriver having sharp edges on the sides. Now the brass tends to grab suddenly when drilled, so the pin had the outer edges cutting like a reamer in an 90 degree angle, which prevents the bras from biting. It's more like shaving than cutting, and will leave smooth walls when going through. The thing that helped also was the fact that the jet was only drilled that small on the tip end. The bore was bigger on the screwdriver end and tapered down to the actual jet hole. That's what helped getting the first bite on it and keeping it centered. I put the pin in the vise and just twisted the jet back and forth until all the way through. Bike runs like a charm with that now. I'm estimating it to be a 53.5 now.
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