new member pics

[ou-72 750cc]

some pics of my xs1b and a very rare ou750 cc yamaha factory dirt tracker engine. the engine in the bike is also a 750 cc dirt track engine.

 

[Jim]

Nice!!

 

[Downeaster]

Pretty bike!

And I see you picked up on our fondness for pictures. Good job, we're pretty subtle about that...

 

[Raymond]

Tell us a bit more about those 750 dirt track engines?

 

[RustiePyles]

Welcome @ou-72 750cc thats one purrty XS1B. Love the chrome frame.

 

[Boog]

Oh boy, shiny!

 

[ou-72 750cc]

hi guys, the bike frame is nickel plated not chrome similar to some of the dirt track frames. the engine in the bike is the # matching 650 with a 750 kit, ported head, sifton cam, special rods, forgetrue pistons, balanced and welded crank, 36mm mikuni carbs and dyna ignition. i have owned this bike since new. the ou72 750 dirt track engine is a very rare one of fifty made by yamaha in the later 70s for dirt track racers like kenny roberts, wayne rainy and lawson. the top end of engine will not interchange with the 650cc engine. valves, rockers, cam and barrel are all different. the valves, cam and pistons are all custom made in the US. the engine also has a welded crank assy. engine uses 38mm mikuni carbs and is said to put out 90hp. thanks for interest. jim

 

[Raymond]

Smoking! Plus nickel plated frame one of my fantasies.

 

[Sparkyduc]

So wouldn’t that be a 1972 XS2?
That’s the year they made the 750’s and it’s got a XS2 front end.
Just my thoughts

 

[ou-72 750cc]

the bike is a 1971 xs1b with a xs2 front disc brake. the engine is the 650cc with a 750 kit. the other engine never came in a stock bike but was made for dirt track racers.

 

[Sparkyduc]

That explains it, thanks OU-72