Surfacing Polini Head and Cyld - Pocket Bike Forum - Mini Bikes
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post #1 of 1 (permalink) Old 04-25-2017 Thread Starter
Surfacing Polini Head and Cyld

OK, alot of you have heard me talk about my surface block that I use to make carb, cylds & heads mating surfaces flat. I made this 1 1/2" thick plate alum at the machine/fab shop I worked at while running my 1015cc Pro Stock Kawasaki drag bike to surface carb & or intake manifolds. It's flat within .0003" of and inch, made on a Bridgeport Mill. Works really Good on small Pocket bike parts. I you double sided 3M poster tape to put the sandpaper on the block. I start with wet/dry sandpaper 100grit, then 240 and then 400 to finish it smoother than a baby's but, lol. It's alot like lapping valves to there seats in a 4 stroke head.
This 4.2 hp Polini cyld had a nick between the O ring head gasket and the cyld opening and it looked like it was slowly burning thru the O ring at that point. You can see it the nick at the bottom part of the head surface in the first photo and then the last 2 are of the finished product. PS; The first photo has my BZM 690 racing cases I painted black when I did the Polini cyld.
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File Type: jpg 100_0676.JPG (508.0 KB, 7 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....

Last edited by EPR; 04-25-2017 at 02:01 PM.
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