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1974 750 GT(Sported)

Posted: Sun Oct 07, 2012 9:40 am
by Bern
Hi Folks,

Thought I would share a few pics of the bike. I recently put new valves in, new venolia high compression sport pistons, rebuilt the carbs, revamped the electrics. She pulls amazingly now. Over the winter I plan to move the ignition switch to the front of the bike using an appropriate relay. The current position of the ignition interferes with the choke cable of the carb for the vertical cylinder. Anyone else have this issue, or could my manifold be the wrong type?

http://farm9.staticflickr.com/8316/8063 ... 9a_k_d.jpg
http://farm9.staticflickr.com/8453/8063 ... 2c_k_d.jpg
http://farm9.staticflickr.com/8171/8063 ... 53_k_d.jpg

Bern

Re: 1974 750 GT(Sported)

Posted: Mon Oct 08, 2012 3:15 am
by radecal
G'day Bern,
What carbys are you running?
My GT has a modified engine and 32mm Dels but has no problem with choke.
Regards,

Re: 1974 750 GT(Sported)

Posted: Mon Oct 08, 2012 4:40 am
by Steve Foster
G'day Bern
... new veglia high compression sport pistons ...
Curious to learn more about the pistons. Do you have a link to the manufacturer/supplier with any details?
Thanks
Steve

Re: 1974 750 GT(Sported)

Posted: Mon Oct 08, 2012 4:53 am
by Bern
Ha Veglia... i mustn't have had enough coffee. :oops:

http://www.venolia.com/

Had to ship them a set of sport pistons to manufacture from.
Im running the PHF 30s..Will post a pic later to show the positioning of the carb.

Re: 1974 750 GT(Sported)

Posted: Mon Oct 08, 2012 1:23 pm
by Steve Foster
Thanks Bern. Do you know if they were the the same weight as the Sport pistons or were they made to match the GT piston's weight?
Steve

Re: 1974 750 GT(Sported)

Posted: Mon Oct 08, 2012 3:51 pm
by BevHevSteve
I stock high compression 81mm wiesco pistons suitable for 750 bevels

https://store.bevelheaven.com/new-arriv ... 0gt/sport/

Re: 1974 750 GT(Sported)

Posted: Tue Oct 09, 2012 5:06 am
by Bern
Hi Steve,

The weight was about 3 grams heavier than the sport pistons and the wrist pins were stock 22mm. The guy who did the machining of the head said I wouldn't need to balance the crank after comparing them to my stock GT pistons. The pistons were first oversize 80.4. I wish I took a few pics before I assembled the engine. They sure were pretty. :-)

This is the issue I'm having with the rear carb. My thought is it's a horizontal cylinder manifold.
http://farm9.staticflickr.com/8456/8070 ... 13_b_d.jpg"

Bern