Rickman engine choice

[Marc.com]

All these flashy Rickmans have got me agonising over my choice of engine, I have B44 motor sitting on the floor, but do I really need twin to get the full experience. Chassis is Mk3.

[Bamford#69]

Hi ,
Are you going to build a Pre 65 or a Pre 70?
A Mk3 is a Pre65 but a B44 is not .
Do you want one that will get to first corner first or one that will get to to finish line first
A 650 Triumph unit motor can be made really fast, but they are heavy,
A 500 Triumph unit motor is light and you have to revs the tits off it 
build a Matchless or AJS 500  a real metisse, if you are making it pre65

[clutchslip]

You know you really deserve one of these Marc,

http://www.ajsmoc.com/62g50csr.html

http://www.manx.co.uk/products/g50/g50engine.htm

[Marc.com]

your right I do deserve a g50 engine, if the price was in AUD it would be shocking enough, for 6600 pounds....hmmmm

[big mac]

Nothing looks or sounds as good as a 500 twin.

[Bamford#69]

  'cept a 650 Triumph twin

[clutchslip]

Well if you have Yen at your disposal I think it's a steal at the moment. With the price of well-restored TR6C s around the
8000 mark in the UK, the cost of a new G50 engine in a Mettisse frame is really not that incongruous...and of course, theres
not exactly many of them being used in the dirt. As with seemingly all things in life, the only problem is you'll end up
talking yourself into the magnesium cased short stroke version with the mag gearbox..

[jimg1au]

hi
team obsolete in  the usa made a g50 dirt bike i have a pic of it on my pc will look for it and post or send it to firko and he can post it for me
cheers
jim

[jimg1au]

i found it

[Marc.com]

Not sure the 650 engine would fit in this frame. It is set up for pre unit T100 engine at the moment so maybe. Anyone know the lengths of various power plants and what fits what, my understanding is 650 needs frame with longer engine cradle.

[firko]

I'm pretty sure you're right about the 650 unit Triumph not fitting the Mk3 pre unit frame Marc. The 650 unit Triumph needs a bigger cradle, I think the Mk3a is the correct frame for unit engines.
Have you considered using an A65 BSA engine? My California mate Mike Middleton has a genuine period 650 BSA Metisse and it's a sweetie. He bought it to Australia in '92 and won the pre 65 class at that years Ravenswood Nats. He's owned the bike since the late sixties and it's been used for everything from desert racing (his original use) to flat track and now nintage motocross. It was red when he brought it here  but has recently undergone a change to yellow "for something different".

[Marc.com]

Have you considered using an A65 BSA engine? My California mate Mike Middleton has a genuine period 650 BSA Metisse and it's a sweetie. . It was red when he brought it here  but has recently undergone a change to yellow "for something different".

wow I Rikey, man that is sweet as..... always liked the A65 engine for some reason.

[Marc.com]

thanks Firko great shot as it gives you an idea of what a big lump of coal the 650 engine is next to the smaller twin.

[vandy010]

forgive my complete lack of knowledge on pre~65 motors,
but whats the Royal Enfield Bullet 500 like as a motor? they seem to be reasonably available and i see the odd one or two when surfing the net.
just curious...

[Marc.com]

forgive my complete lack of knowledge on pre~65 motors,
but whats the Royal Enfield Bullet 500 like as a motor? they seem to be reasonably available and i see the odd one or two when surfing the net.
just curious...

still in production after all these years..... to answer your question, slow single but normally reliable.

actually I was reading Enfield are developing new motor and they will stop production of the old grinder.