If the pipe is just 3mm OD the tolerance for a press fit is going to be hard to achieve or quantify at home (2.992-2.996mm ?)

Personally I would put it in a jig under the drill press or mill, drill it to 2.9, then ream quarter (maybe half) to 3mm and press it all the way in using a 2.5mm drill bit or silver steel with a drill stop as a shoulder to do the pushing – this should keep it nice and straight – I might even pop the brass nipple on ice and I would use a dab of Locktite for sure.

Educated guess and keen motorcyclist, not a metallurgist.

Edit* I see it's 3.5mm but you get the theory hopefully, I would also be sure to remove any sharp edges off the nipple, and perhaps spin it up in the lathe or drill chuck and add a small chamfer to help wedge in, 0.5mm x 20° perhaps?

Edited By Russ B on 07/07/2014 20:59:24

Mike,

For future reference: eurocarb appears to be the genuine successor to the original UK importer of both Dellorto and Weber. … Lots of useful parts and diagrams on the site.

MichaelG.

Edited By Michael Gilligan on 08/07/2014 07:11:22

My experience of fitting a Mikuni two stroke carb onto a four stroke engine was that the emulsion tube design is quite different. This did not prevent me managing to tune it up to give quite reasonable results, but it was not trivial…I had to hacksaw off a piece of the emulsion tube that stuck up inside the intake partly surrounding the needle. I still had to be careful about opening the throttle too suddenly at low revs, but then it was a rather large bore carb for the size of engine so such things are to be expected.

John

Being a child of the mid 80's I feel like I've missed out on so many elaborate engines, with almost every mass produced car engine being an L4, with the occasional L6 or V6 and a few deviations to the motorbike scene throughout the 90's – bar the sad loss of many 2 strokers =(

The only things that stand out in my memory are Volkswagen's 2.3 V5 (nothing really special) and the long standing but slightly fragile Wankel from Mazda. I have good memories of big 2 strokes as I fortunately grew up in the garage with my head between a Kawasaki H1 and a H2 (mums and dads). I know now Aprilia are closing the curtains on the final models in its 2-stroke range.

It all feels a bit sad and homogeneous and I'll be doing my absolute best to get my hands on a few special bikes during my lifetime and doing my bit to keep them alive! I'd like a rotary… but who wouldn't……. and a big 2 stoker along with a couple of classic race bikes, one 2, one 4 stoke.

I believe there has been a bit of stir about Norton producing a new Rotary engined motorbike – I'm not sure if they'd run in to emissions issues with the tip lubrication but I guess Mazda do ok!

.

Yes