Alrytie guys, been awhile, but to keep you all in the pic as to what had happened exactly with my motor and what I have done to get it up and running again. Well the task at hand was no joke, but I was phsyched out for the task. I pulled outt the motor and took it up to my spare room and began the strip down. The last motor I stripped down was a Jetta 2 CLi 16valve, so I had some previous stripping
experience
. I pulled off the heads, dropped out the sump and I noticed some metal pieces lying around in there
. pulled out the oil pump to take a better look and
there it was!! rod end was in pieces and the bore of my number 3 cylinder was bust and the crankshaft was scored. So yip, the search began for a replacement motor. After some serious battling, as some guys wanted to tax me the same for a motor as what I would pay for another bike, I thought I would try for and NC24 motor, but also no luck. Now, I knew I had an old NC24 block lying around somewhere, so I pulled it out and thought
"I wonder If I could use the upper NC24 on my Lower NC30??" I know all you guru's here would say no, so I thought what the heck, what do I have to loose. Well, It ended up being a success story that I will tell my Grandchildren, because I actually pulled it off
Yup, did some Mods to it, replaced conrod and rod end, bearings, crankshaft and vroom vroom. Yes it is running now, so before you guys cut me down, IT IS RUNNING. It wasn't all that simple though and I found out some things the hardway for any of you that are thinking of doing it.
1. The mounting holes on the carb side for the cam gears will not line up (about 3mm to high). I filed it oval and then machine out a 5mm thick oversized washer to cover the oval and some valemoid gasket paper (2mm thick) to seal it up nicely.
2. The oil pipes on top of the block, under the metal water pipe is not used on an NC30, so I cut them and blocked them off with silver solder. BUT!!! The little oil hole that goes from the Cylinder hear to the crankshaft journal joins up with the hole and was not machined fully through
(NC24 used a different way to get the oil up to the heads) and I found this out the very HARD WAY
after my first assemble and startup. It cost me having to get another set of cams and holders, cos mine seized up after like ten minutes of the motor idling. After a second teardown (by now I did it in double kwik time) I noticed this and with the aid of a 5inch tungsten carbide drill bit, I carefully drilled out the incomplete hole all the way through to the hole that went from the top of the block (where the pipes I blocked off are). Now my cams will be getting oil.
3. Used the NC30 lower crankcase, as the gearbox gears and selector forks and barrel were different to that of the NC30.
4. Aluwelded the hole that was on the Lower crankcase at the beginning.
Everything else pretty much butted up perfectly and after running it for a while, there are still no oil leaks, between the cases or at the cam gear mounting holes. Should anything break, It was still worth the effort as I still am looking for a reasonable motor down the line. But for now, she is running and goes pretty darn well might I add.
