Wednesday 26 June 2013

Buttoned Up

Got a call from Roger. 11 days from now is the first and likely only dirt track race in our area. Afraid we're not going to make it. Probably best anyways, never ridden on a dirt track before:). I am stoked about getting this thing out there though. We'll post some video if I can get it sideways later. Hopefully we can keep it uprightish. Roger got his little Yamaha done. I don't have any good pictures, but I got one with my cell.






...back to the XS.
So some more progress.
Bottom end is mostly together.

Bought the 750 kit from Gary Hoos a few months back. Didn't bother sending him my cylinder as he had a '71 sitting on his bench. The only difference I could find was the four bolt tensioner vs. the six bolt on my "72, so I went ahead and bought it from him.

I welded a couple of lugs on to the tensioner mount so I could use all six bolts on my tensioner. I assume Yamaha did this change for a reason. Anyways now my '71 cylinder accepts my six bolt tensioner.




Got the cylinders on, then realized I forgot the o-rings for around the sleeve bottoms. So took it all apart and added the o-rings. It was then I realized when they bore the casting for the bigger sleeves, they don't bother with the o-ring grooves. So after some research... seems nobody bothers with them on the big bores, so off they came and the cylinder went back on. That was a waste of an hour or two.



New electricity maker installed. This is a nice piece. Don't hesitate to send $300.00 to TC Choppers, it's good stuff.


Don't like the kickstarter action so much. Has to rotate 70 -80 degrees before engaging. Have to open that back up and see if we can resolve this issue. Seems that most of them are like this. 

Took out about 20 lbs. of shafts, gears and starter motor. We'll be kick only. Just as any good race bike should be. Have to figure out a good seal solution for the gaping hole where the starter used to reside. I'll get one of them nice lithium battery's from Ballistic, they're tiny little things. 

Have to decide if we're going to put the stock decompression unit back in. The '72 has the cool little lever under the throttle, but of course this is gone with the modern throttle tube assembly. Have to figure that one out as well.


Friday 21 June 2013

No excuses now

So the rear lower frame mount is now moved to allow clearance for the carbs.
The engine ends up rotated about 5 degrees forward, fits nice.

Mount removed

Mount removed

Newly re-located mount
My ugly welding

Top fuel Harley head beside my little 650 head.
Almost done. Valves will go back in this week.

Top fueler barrel, cool stuff Roger gets to play with.


 So no more excuses. The engine is starting to go together finally. We'll get it assembled then back in the frame for pipe fitting and bracket locating. Ended up with SS 1 5/8" diameter pipe material. The 1 3/4" was 16 ga, so I figured I'd rather have the 18 ga in the 1 5/8" diameter. Might help a little with bottom end as well. Still not sure if we are going high pipe or low????