Scooterotica

Im putting a Gori GP50 on my Avanti 225 motor. 110 x 60 crank LI150 box but can use SX200 or maybe even TV200 if I can find it.


What final drive gearing would people recommend? Don't want to plunge in a buy the wrong clutch sprocket


The GP50 pipe fits well with the larger Avanti cylinder BTW, plenty of clearance all round.

Use Tony Cassidy's gearbox calculator. I'd probably aim for around 4.6 unless the Gori is a revvy pipe.

Download it from here .... https://avantone.wordpress.com/
You can compare 2 gearbox set-ups side by side with it.

Cheers man.


The people I got the pipe from suggest its quite revvy.

I would go with a 4.8:1 final drive

http://www.ilambretta.co.uk/forum/viewt ... n&start=40

It's a high rpm pipe.

It's easy to get sucked in to the whole gp50 thing with its high power output but looking at those dyno charts I'd go for the gori 50 every time over the gori gp50.

I wouldn't say I was "sucked in" The pipe I really wanted isn't readily available, Ron Moss Clubman so after much deliberating I plumped for this.

I didn't want an expansion exhaust and all the other clubman type pipes seem to have drawbacks. I asked Ron that many questions I thought I was being a pest so decided this was the one as it seems to offer what I was looking for.

I did ask on here a while ago but no one really offered any worthwhile advice and people went on about making one and when I asked what they did (being an engineer myself) no one seemed to know or have any insight so I gave up.

I was just saying the gp50, the most expensive pipe they do is the one everyone seems to be talking about but if you check out those dyno graphs it makes very good power but it has a narrow power band and peaks early.

On the other hand the gori 50 although les peak power has a much better and more rideable spread of power.

If I were getting one(and I probably will) it would be the gori 50 from Rimini, they say it has specific modifications only available from them so should be good.

I just wonder if folks are being sucked in by the beautifully sectionaly welded down pipe which to be fair looks the b@11@x.

Gearing wise: I'd say 18x47 or 4.8:1

I've got it now, I'll try it and see how it goes.

Hopefully it's not all revs and clutch or it will be coming off.