Then let's do an update again.
First we made some spacers to mock up the swingarm mounts in their final place.
We mainly wanted to check at this point if the frame tubes clear the engine nicely.
As we don't have a proper 3D model of the engine, that clearance/fitment really need to be checked on the actual engine.
So we proceeded and mocked up the tubes for the rear section of the frame.
Note that the top tube has also already been shortened.
That looks then like this.
Everything is roughly in place and a few tack welds hold the parts together...
The the frame went to our welders.
They made a small jig out of some steel tubes which we still had laying around and then TIG welded the complete assembly.
After they did their magic, I put the frame back on the engine to check the distorsion.
That's the result...
While there's of course some distorsion, it's actuall all better then expected.
We don't need to mechanically straighten the frame, it can be used as it.
But that's also due to a small trick!
The swingarm mounts are so far not bored to size, they're still 4mm smaller in diameter.
Once the frame is completly finished and all the small parts are welded on, we'll put the frame on one of our machines and drill out both axle mounts to size, all in one go.
In this way we can make sure they're straight and that the position and angle are correct.
The top tube will also be the oil tank for the engine.
So we had to add a filler neck as well as flanges for the hoses.
The oil feed is down at the left, lower frame rail. It has been internally broken through to the main tube.
The oil return is the long tube, which we weld into the bottom of the main tube.
It's long enough to end over the oil level, when the tank is filled.
At last there's still the cam-cover vent hose.
We used an 8mm tube which goes into the tank on the bottom end and then inside the tank to the filler.
I asked my welder to take some pictures this time...
And that's the current state of affairs...