XS650 750cc big bore 277 re-phase Shell #1 cam ported head titanium valves - first start ever

Finally after weeks of work I got the chance to fire up the engine for the first time ever. 2 priming kicks, then 2 kicks with ignition on and it fired right up. Little bit of tuning, timing etc. and off to the races. www.dotheton.com FTW!

[@dothetontim]

It was a whole package I worked out with Ryan for the ported head with the titanium valve train, rephased crank etc. so you're best off talking to him about it. No clearance issues at all - the XS pistons have big valve reliefs cut into them, and the 750cc pistons I used have larger than normal valve pockets to accommodate the larger intakes.

[@dothetontim]

In theory it is smoother than stock. But I went from a bone stock rebuilt motor to the fully kitted out rephased motor with the ported head, 750 kit and hot cam, so it's apples and oranges. It runs awesome. I might have done something bad running it in Alabama in October for the annual DO THE TON Mama Tried get together coinciding with the Barber Vintage Festival. Got it up to 120mph at about 9000 RPM and it's smoking a bit out the left now. Will tear into it and see what I did :)

[@ProSimex]

That is the best sounding thing I have ever heard ever..

[@milancurda8740]

Beautiful bike man,very beautiful!

[@dothetontim]

It's a 1972 Yamaha XS1b (early XS650) frame with a 1984 XS650 engine that has been significantly modified. The tank is a custom aluminum Manx replica as is the seat. Not much is stock on the bike. You can see all the details on our site - dotheton com (KZbin doesn't allow the posting of links).

[@kingzreptilez4life]

Im aware of the piston having valve reliefs, just wanted to make sure nothing touches. lol. I am going a bit over 750 and want to keep stock diameter valves and maybe reduce the intake diameter a bit. Anyways thanks for the help.

[@andrewkrencis6943]

That’s wicked man

[@zerotolerance39]

Need a video riding!! I'm currently re building my motor for my sunday cruiser chopper no details fire time being but it will require 112+ octane fuel!!!!

[@dothetontim]

If you search for Tim XS650 750cc you'll find it - topic #448 (I started the build in 2007)

[@dothetontim]

Tank is a custom one-off replica of a Norton Manx racing tank. If you want to know more about this bike and where to get a tank etc. Google us at DO THE TON (can't past a link here)

[@matsoberg1]

Now, how sweet is that!? Second stomp, huh? Is it just me or is a rephased engine running smoother?

[@kingzreptilez4life]

I looked up your build. Nice work. My only concern is the valves. Ive turned down Ti valves to OEM spec but yours are not only oversized but by the picture the intake is not dished (piston relief).Any contact there?

[@dothetontim]

Check in with Ryan at 707Racing (can't post the link here). He did the head work and rephased the crank. It has titanium valves and retainers sourced from NASCAR, as well as custom milled bronze valve guides. You can read all the gory detail over at DO THE TON (easy to find) the biggest cafe racer website out there (I run it).

[@kingzreptilez4life]

Ive done the same. Just have to cut some valves about 40mm shorter and turn them till they meet oem specs. Ive just never heard of anyone having them on the shelf. Whats the name of your thread? I looked at the forum and its pretty cool

[@ktindagt]

Excllent looking machine, Congratulations. What tank is that?

[@kingzreptilez4life]

Who supplies Ti valves for these motors? Do you have the Ti valves or just the Ti spring caps? Did you degree your #1 cam after install?

[@kingzreptilez4life]

If you do not mind me asking how much did guides, valves, caps and keepers run you?

[@paulturner3553]

Weird waddling sound. The seat looks like a real ball killer.

[@dothetontim]

The seat has a cutout for the balls, and the short open pipes coupled with the camera's microphone certainly contribute to the sound. That and the 277 degree re-phase of the crankshaft alter the sound and performance pretty significantly. It was an absolute beast easily taking me to 120MPH with more to give. Sold the bike a few years ago to a first time rider and haven't seen it or the rider since.

[@paulturner3553]

@@dothetontim, A first time rider sounds like a death sentence to me. My first bike was a 1970 Honda SL 100. Second and 3rd were 1968, 1970 Honda CL 450's. Last bike was a 1977 650 Yamaha twin. The Yamaha was the best of the 4 bikes. It had the least amount of maintenance related issues.

[@EAG3025]

What year model is the bike/