750 Breva 1979 V50 Hybrid...

[remfanuk]

I have another thread about tyres/swingarms/wheels etc. on the forum but it was suggested that I reach out to 750 Breva owners who might be able to answer a query.

Are the u-joints the same on my 1979 V50 as those on a 750 Breva allowing a Breva 750 swingarm to be attached to the V50?

Many thanks.

[Frenchfrog]

Pretty certain that the splines are different....but they altered between the V50/2 and the 3 I think;certainly on the Monza and 650 series.Possible that they were altered after that too.

[guzzisteve]

If you only swap the motor is the only way.

[remfanuk]

If you only swap the motor is the only way.

So, the complete engine, gearbox and swingarm/final drive would be required, which I believe is not just a straight swap?

Thanks.

[johnk]

I don't believe you need the motor swap but you do need everything from the flywheel backwards. The transmission output (and possibly input) splines are different.

While this is being discussed, I 'think' the newer transmission will bolt into the engine and frame without too much difficulty but I don't know it. Is this actually a known possible thing? Either with a breva or even one of the later small blocks with great 6 speed transmissions?
Thanks and sorry about the minor thread hijack (if this even gets a response).

johnk

[guzzisteve]

You need to explain which parts from what models you are mixing.

[dbarale]

What’s the end goal? Fitting a wider rear tire?

[johnk]

It's on an already highly modified bike. The main things I'm looking for out of this are a stronger clutch and better transmission. I know I'll need the driveshaft and swingarm from whatever I end up using.
I started a chart to try to figure out the best gearing ratios between all the different transmissions and there are so many variables I figured I ought to find out if the cases can even bolt together and fit in my frame first.

[paulbricey]

I have a 750 Nevada gearbox (5 speed) and that WILL FIT on both my V50-3 engine & two V65 engines that I have.....between gearbox & V50 engine, it just needs the V65 clutch plate as the spline count on the V50-3 engine  output shaft is different. Not sure what year as I got it as a bucket of 'cafe racer project bits' from Gutsibits but the wire wheels were also Nevada & around 2001 vintage AFAIK. A trawl through the parts manuals should help & I've used Gutsibits site as a rough compatability checker since they generally list what fits what.

[Muzz]

There is a guy who is still listed, steamdriven NZ, who had a creation he called the Monzada. I would suggest you try a p.m. and see if he responds. Namedrop Muzz, it may help.

It took him two years to insert a Neavada engine in to the Monza frame., and he is no slouch. However, his aim was to make it as though it was original. It was not a straight swap. He would be able to help I am sure.