This morning I picked up the "NSR head to lathe adapter" ring and spacers from the machining shop. Only cost $75 which was half of what I was told it would cost. Win. In order to make it attach to the head, three of the 6 stud holes in the head were tapped M8. It worked a treat.
One point of interest that was bought to my attention by "he who must be obeyed" that I hadn't really thought about:
With the deck height on the Wossner (22.0mm) about 0.6mm less that that of the standard Honda pistons (22.6mm), this means that I am effectively raising all the ports by 0.6mm. I am actually pretty happy with this and will be interested to see how the power delivery comes on as a result. I will probably loose a slight amount of low-end/ midrange and gain a bit of top end. Time will tell. If it is a bit peaky, I can always machine a bit off the bottom of the barrels to get things back to normal I guess.
Just for the record, I am using standard 0.6mm thick base gaskets and standard 0.3mm thick head gaskets.
I am too tired to do a proper write up right now. Its been a long day in someone else's workshop.
I was up at 06:00 and it is now 23:25. Yeah, I'm gettin soft.
Here are some pics though:
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| Weight of piston assembly with 20mm wide RM125 small end bearing |
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| Head adapter ring for lathe 01 |
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| Head adaptor ring for lathe 02 |
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| Head before machining |
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| Machining close up |
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| Machining |
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| Squish set at 0.8mm 01 |
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| Squish set at0.8mm 02 |
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| Squish set at 0.8mm 03 |
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| Combustion volume set to 12.8ml to top of spark plug hole |
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| Chamfer on top edge of barrel is non-optimal. probably there to ease the nikasil coating process? |
An interesting Fuel vs Squish dynograph
here
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