TZ700 origin? anybody seen this before?

[m in sc]

https://www.oldbikemag.com.au/alex-campbell-self-made-racer/oba62-alex-campbell-13a/

saw this on FB in a group and seems legit. anybody have any deeper info on this?

"Have already mentioned this within a comment, but what I find to be quite an interesting fact about the TZ700 engine is that it was originally developed in my home town of Mount Gambier, South Australia, by Alex Campbell around 1970ish for a sidecar. It started as a pair of TR3 350s with gearboxes removed and crankshafts coupled, with the assembly bolted to a Manx Norton gearbox. Yamaha heard about it and sent a couple of engineers out to Mount Gambier, where they studied it, and later bought out the TZ700. Can read more about Alex Campbell and his motor on oldbikemag.com.au, by searching Alex Campbell."

https://www.facebook.com/groups/CarburetorAppreciationSociety/permalink/1580409589445968/

[Dvsrd]

I thought the TZ 700/750 came as a result of the GL750 four cylinder, watercooled prototype street bike?

[IR8D8R]

Definitely not for a motorcycle. The two left cylinders would be sticking way out with the primary in the middle between crankcases.

Can't really see where the drive chain comes off. It would be right in the middle of the welded up housing on the Manx GB. Surely they extended it but to where? Unless it's where the blue stuff is... Or underneath.

IR8D8R

[m in sc]

sidecar racing rig. read the article.

 

[IR8D8R]

Ah OK. I didn't see the "NEXT" I knew it was a sidecar. Thew second pic is what I needed.

[busa1300]

I thought the TZ 700/750 came as a result of the GL750 four cylinder, watercooled prototype street bike?

Yes 

[rodneya]

Thats the second crazy 4 cyl build from New Zealand / Australia. Sidecars must be big down there.

[m in sc]

but this predates the gl