Guide: Preparing a block for a Big bore cylinder (part 2)

I have previously processed the engine block to fit my Malossi big bore cylinder
Now it's time to cut out the transfer channels and boost channel.
The effect increases due to the flow of fresh gases in the crankcase gets better.

Check out the Youtubeclip at the end



picture 01
Use the cylinder basegasket as a template


picture 02
Use a scribe to mark where you should cut
Tip
Screw the template with studs and nuts so it stays in place


picture 03
This is the "transfer channel"


picture 04
This is the "boost Channel"


picture 05
Other "transfer channel"


picture 06
Cutting down the channel towards the line
Tip
I use a cutter with a rounded top


picture 07
Try to keep the same angle (slope) of the channel
You should not cut out the bottom of the channel
Tip
Dont press hard
Move counterclockwise


picture 08
I grind the edges of the channel with the larger cutter
NOTE!
Be careful do not to scratch the gasket surface


picture 09
I then use a smaller cutter to be able to fix the corners
Then take the other corner in the same way


picture 10
I finish the surface with a grindingstone
Tip
The surface should be as if it were sanded with 240's grit paper


picture 11
I verify that the port is in line with the channel


picture 12
Then do I second transfer channel in the same way


picture 13
Then the boost channel
The same tool and method as previously


picture 14
A file makes it easier to fix the corners

Follow my continued work with my Malossi Big bore 87cc
In the next step, I cut out the block for the crank with the long rod