Hi Loek.

I was busy with my lathe in my Garage. I had to fit the air funnel on the dellortos.
The engine should still work  with damped and filtered air.

You have got an PM.

Regards

Ralf

Hi Loek,

a BT1100 is good engine to start a new build up of a race engine. You can use the lighter crankshaft, the cylinders (nicasil plated instead of sleeves) and many other parts depending on their condition. The pistons are o.k but not good for a high compression ratio. Then you need something special made. I think that Sepp has new pistons on offer ?

In my old TR1 crankcase I found that the outer rings of the main bearings have rotated in the crankcase bore. The race inner ring on the right hand side shows lots of frictional corrosion.  
I changed the right main bearing from ball to a roller bearing. But then you have to add a turned distance ring between race outer ring and the crankcase bore. Finally I used Loctite 648 to fix the parts together. Now the thermal expansion of the crankshaft takes place inside the roller bearing and not between  crankshaft journal and race inner ring. Hopefully......

I have now almost finished my TR1  and going to start/check the engine next week. Then the dellortos will work up for the first time.

Hi Ralf

How did the bearings turn out?
Thinking about doing the same on both side so I can use standard bearing sizes.
Yamaha asks ~130 euro per main bearing