Carby Jets?
- Thread starter canalcat
- Start date
butre
Well-Known Member
I know a .0250 wire gauge drill is about in between a 63 and a 64 jet so I would have to say they're sized in hundredths of a millimeter, ie. #72 is .72mm
I keep a handful of .0250 wire gauge drills and then embiggen the hole with a torch tip cleaner until it runs right. way cheaper than keeping an assortment of sizes with backups.
I keep a handful of .0250 wire gauge drills and then embiggen the hole with a torch tip cleaner until it runs right. way cheaper than keeping an assortment of sizes with backups.
Fabian
Well-Known Member
Unless you have a very accurate and expensive drill press and jig holder, it is much better to simply buy a range of jet sizes from No #65 to No #86, in individual sizes, eg #65, #66, #67, #68 etc
I have every numerical jet size from No #65 to No #90.
A full compliment range of jets is the only way to properly dial in your carburetter.
In the lower south eastern part of Australia, using the highest octane (non ethanol) pump grade fuel, most of my engines fall into a jet size zone of No #76, though i have had one engine that ran optimally on a No #70 jet and another engine that ran optimally on a No #86 jet.
I have every numerical jet size from No #65 to No #90.
A full compliment range of jets is the only way to properly dial in your carburetter.
In the lower south eastern part of Australia, using the highest octane (non ethanol) pump grade fuel, most of my engines fall into a jet size zone of No #76, though i have had one engine that ran optimally on a No #70 jet and another engine that ran optimally on a No #86 jet.
sbest
Active Member
Figure out if you are rich or lean (rich I'd bet). Jets here are $3-$6 apiece. Use a tip-cleaner to see what size you have and buy several sizes in the direction you need to go. in a worst case you've spent less than $20.
Steve
Steve
butre
Well-Known Member
I don't use a drill press for micro drills. mine doesn't go slow enough, so I just turn the bit by hand. I've had a few break, but they're cheap. at the rate I buy them it's cheaper than buying jets.
45u
Active Member
I hate folks that drill jets as when I work on a motor trying to get it right and the jet has been drilled I have no way to tell other then spend more time to figure it out. I have run across this MANY times working on motorcycles so from now on if I think it has been drilled I just charge the customer and put a new one in. Yes I know you can spend time using bits to figure this out but cost the customer more time and the jet is cheaper. All so when drilling a jet you can sure mess one up.
butre
Well-Known Member
I don't drill other people's jets and I do all my own repairs so you'll be happy to hear that you'll never have a bike come in that I've drilled the jets in.
45u
Active Member
butre
Well-Known Member
I don't get rid of anything, I use it until it breaks, fix it if I can and keep it for parts if I can't. if there's nothing worth keeping on it I'll send it to the scrappers, and if you're buying engines from the scrap yard you better be able to figure out something as simple as a drilled jet.
45u
Active Member
Can not take it with you when you die!
