The 50

[koba]

It is as close to Buckets as I can get from here...
Keeps me amused.

Yeah, I totally get that buzz actually.

I'm happy to crash any of them anytime too.

[Farmaken]

Tim, have you had a look at KTM50sx pistons ??
12mm pin .8 ring 39.5mm std bore

[RMS eng]

Well if they finished the 50, spanked a few more hp out of it & put the broken old man building it on top of it, I suspect he might frighten most of the field.

thanks for the plug Dave,but not sure i have the plums to frighten anyone but my self,i know i can make a fast bike but the riding of it will be a wait and see if i ever make it to the track,hope to some time.

[cotswold]

Tim, have you had a look at KTM50sx pistons ??
12mm pin .8 ring 39.5mm std bore

They are on my list for the spare cylinder and seem to fit the bill but I was hoping to salvage the one that is at 40mm, the over size KTM is 41.5 and I think would make the bike over size....
any one work that out for me 40 stroke 41.5 bore but I think is about 54cc

[TZ350]

the over size KTM is 41.5 and I think would make the bike over size.... any one work that out for me 40 stroke 41.5 bore but I think is about 54cc

Yes 54cc ...... (its a bit pointless but 54.11 if you want to be exact)

[cotswold]

The issue I am having is that every piston that looks any good size wise has a ring pin opposite the ex port, this means the ring tips will be passing over the port seen in the picture just above the inlet port. If I just said sod it and bought one would it just be a time bomb waiting to throw me up the track?

[F5 Dave]

Ideal. Directly opposite the ex is great. It can travel over the boost port no problem as long as there's no twist, ie the port is symetrical. Run this way on the MB with KT piston

[cotswold]

Ideal. Directly opposite the ex is great. It can travel over the boost port no problem as long as there's no twist, ie the port is symetrical. Run this way on the MB with KT piston

Cheers Dave,

[TZ350]

It can travel over the boost port no problem

Ran TZ pistons for ages in the RD's, the TZ's had a central ring peg and the ring gap passed over the boost port no problem.

[F5 Dave]

Rotax 256 kart/GP engine was first I saw to do this.

[mr bucketracer]

i had to on my rd50 drill and put the ring pin in the right place , if i could do that at 17 i'm shore you will not have a promblem

[cotswold]

i had to on my rd50 drill and put the ring pin in the right place , if i could do that at 17 i'm shore you will not have a promblem

Ask KEL WHAT HE THINKS OF THAT IDEA

[TZ350]

i had to on my rd50 drill and put the ring pin in the right place , if i could do that at 17 i'm shore you will not have a promblem

Ask KEL WHAT HE THINKS OF THAT IDEA

shifting the ring peg, that didn't go so well for us.

[F5 Dave]

Pete Sales did my RD50 piston peg relocations. Always worked fine. They died for other dumb reasons of my doing.

[TZ350]

Pete Sales did my RD50 piston peg relocation's.

I think our problem was the type of wire I used for the pin. I used SS welding wire and I think it fractured, it probably would have worked if I had of used piano wire instead.