1977 Yamaha XS750-2D+ 750cc triple

During the winter of 1998, I updated my 1977 XS750-2D with the later, higher performance parts from a 1978 XS750SE, that's why I call it a "2D+." 

Yamaha improved the triple a little every year, but the biggest jumps in performance for the triple were the 1978 E model and the 1980 850cc version. 

I documented and quantified my progress and wrote an article about it for Classic & Motorcycle Mechanics magazine in the UK. 

The article began in the June 1999 issue and will end one of these days. 

The only parts I couldn't use were the pistons. 

Both sets of cylinders were too worn to use stock pistons/rings so I had the best set of cylinders bored to the 1st oversize, honed and fitted new pistons and rings. 

The update also included a solid state ignition, stainless steel brake hoses and a Hooker 3-1-3 exhaust system.  

For 2000, I replaced most of the fasteners with stainless steel, installed new fork seals, a front fork brace and rear shocks.  

In 2002, I replaced the Hooker 3-1-3 exhaust with a Jardine 3-1, found a set of stock sidecovers and a new fuel tank, installed slotted front disc rotors, replaced the stock front brake master cylinder with one from a XJ750 Seca and installed a 3-1 chrome air filter.

For 2003, I installed a NOS seat and mirrors from eBay.

2D+ with new Jardine 3-1 (APR 2004)

 Tkat's fork brace makes a big difference

  2D+ with Hooker 3-1-3 (MAY 1999) 

  At the Washington Monument in DC with the fairing installed (NOV 1999)

"Bikes of the Year" 1999, Yamaha R1, and 1977, Yamaha XS750 (NOV 1999) 

 Hooker 3-1-3 headers look so cool

 Grace's first ride on the 2D+ (JUN 2000)    Steve's hamming for the camera