MOPED ARMY

see this one? http://www.mopedarmy.com/forums/discuss/read.php?f=7&i=97681&t=85662

bump. I'm not going 17mm but I think I get it, however need to see detailed pics before and after if someone has them.

It turned out to be FAR easier than I imagined when I happened on the right tool. Luckily, when I was rifling the bin of oversized drill bits a tapered hand reaming tool caught my eye. They're very common items. Every hardware aisle will have one. I have three of them and they all measured almost exactly 14mm at the broadest point. Bring a caliper along when you go out to buy one.

I removed the dowel that is mounted crosswise at the top (used to turn the thing by hand) and chucked the tapered reamer in a hand drill. What's nice about this is that you can clamp the carb CAREFULLY in the vice and bore through slowly with the reamer without having to worry, as you would with a twist drill, about binding the bit. A drill press would be an improvement, but not really necessary using a tapered reamer.

Once the reamer has gone all the way through, you'll have to go in again from the other side since the widest part of the reamer will not get all the way through. Voila.

It doesn't leave a flawless finish, but it's no sweat to put stick a ball of steel wool on the end of a stick and run it through a few times with the drill.

Is it a 14mm intake? No problem. Otherwise there's prob little to be gained by boring the carb. While you've got the steel wool on a stick run it through the intake as well to polish things up.

Another thing to check which isn't often mentioned is the intake port at the head. Lather up the intake elbow with prussian blue (or similar) and bolt it on without the gasket. Remove it and see how well the intake boring lines up with the actual intake manifold.

It was unbeliveably off on both my Newport and my Maxi. The Maxi was especially bad. The boring was way out of round and blocking about 20 percent of the flow. It was pretty easy to dremel it out to the blue dye with a carbide bit.

Another way to gauge it is to cut a paper gasket to fit the intake manifold perfectly. Lay that pattern on the intake port and line up the bolt holes. Trace the circle inside with a marker. Dremel away.

Good luck.

its a 12...want to make it a 14...shit, I just may buy a Del carb and intake and call it a day...sounds like too much BS and I have the money to spend

I drilled my bing like what I was talking about when I started this post. The drill press is a must. use plenty of cutting fluid and a good bit.

I started this post cause I had the same question...look at the name.

All I meant was try it. Get a 9/16 drill bit and lube and go at it. You will need to cleam out all the aluminium chips and whatnot real good after. The 9/16 bit is 14.3mm, them I honed/cleaned up the inside making it 14.5mm. Take your time, use plenty of cutting fluid, and a drill press. Check out the results in the attached pic.