RD/RZ 250-350 motor Used in dirt track

[Dono113]

Sitting in the garage yesterday going over a few pic's of bikes I've owned and I came across my old RZ250 with a 350 top end, man this thing was quick little 2 smoker. Then the thought popped in about using those motors in  dirt track anyone done this swap or contemplated??? Would the RG250/500 work too if you could go down that route

[Lozza]

Have you got a RG5 motor spare? I dunno if the 350 would be any good for dirt track, but with the obscenely cheap stroker cranks and a Athena kit to take you out to 421cc(about 75 peaky HP) it would be a lot of fun trying

[SON]

RD/RZ 350/375/420 brilliant on Dirttrack. I am currently building two.
RG250 /500 not so good, I have had several of both and have plenty of experience with the 500 tuning even in Formula 500 Speedcars, Tony Prior won several OZ Titles powered by them.
Lozza please build one, I would be happy to help,

[Lozza]

Where are all the RG500 bottom ends then? 

[SON]

Metros or Steve L for an ex Japan RG400 bottom end
New 500 top end or worn 500 top end and big bore it to 680,
that will make it mental,
Good Luck getting someone to ride it
I think Gilesy would be too sensible,
maybe Willis or Danial Stauffer

[Lozza]

Thanks but I'll go with my Japanese contacts. TZR 3xv cylinders over RGV is the latest option we are looking into. The standard RG cylinder is well mid 80's technology.

[SON]

For what purpose ?
Or for what chassis ?
I have a RS250 waiting for horsepower
livo wants to use his new tig.

[ChrisACT]

Do it, already!  What could possibly go wrong?

[Lozza]

Christ no keep Glen away from AC, take it down to the Tig Man     RGV/RS or even the RG frame (with the German shock kit) work a treat , RGV is a bit tight though. Want to go either P6 or Pre 95 PCRA.

[SON]

I still have the Schwantz pipes, Carbon cans and the AP Carbon brakes from my first Lucky Strike Replica from 92.
Seat, Fairings and a few other bits,

[Lozza]

Lets make some moulds off the fairings?

[SON]

Mario made the moulds 20 years ago,
I have them somewhere,
The bike from Streetbike mag is on the website,

[SON]

better not hijack the thread,
I have two Flattrackers with Yamaha twin engines
1 has an air cooled bottom end with a TZ750 cylinder so 375cc a genuine little brother to the most famous of all Flattrackers,
the other is RZ bored and stroked to 420, that is going into a DT200 chassis moded by another forum member,
I am building it to frighten people at the Flattrack Nats and the Troy Bayliss Classic

[Dono113]

A couple of RD400 just popped up on ebay
http://www.ebay.com.au/itm/YAMAHA-RD-400-CLASSIC-BIKE-PROJECT-RACER-/121066086736?pt=AU_Motorcycles&hash=item1c3019e150
And hijack away my good man it's enlightening to hear people's thoughts

[firko]