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Old 10-22-2011, 01:59 PM   #46
smokeeater495
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Return the incorrect piston and order the right one. Self porting the skirt will result in a poor running machine or a blown-up motor.
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Old 10-23-2011, 08:24 AM   #47
smokeeater495
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I just spoke to my friend who used to make pistons for Zollner. He said by drilling your own ports you will unbalance the piston and definately weaken the skirt. Guaranteed you will destroy the engine.
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Old 10-23-2011, 08:40 AM   #48
ctune80
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In the early days of MX it was common to drill and modify piston skirts on
race bikes. I've seen lots of bikes that have had modifed skirts back when
reed valve kits were coming on the market to put on the old piston port bikes.
Considering this bike won't be a racer I would think there would be little risk.

Judging by the quality of the work I'v e seen on this project I'm pretty sure it
will be done right. Make sure to chamfer the openings to eliminate sharp edges
stress risers and prevent cracking.

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ctune80 screwed with this post 10-23-2011 at 08:54 AM
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Old 01-20-2012, 11:05 PM   #49
LasseNC
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Quote:
Originally Posted by ctune80 View Post
in the early days of mx it was common to drill and modify piston skirts on
race bikes. I've seen lots of bikes that have had modifed skirts back when
reed valve kits were coming on the market to put on the old piston port bikes.
Considering this bike won't be a racer i would think there would be little risk.

Judging by the quality of the work i'v e seen on this project i'm pretty sure it
will be done right. Make sure to chamfer the openings to eliminate sharp edges
stress risers and prevent cracking.

___________________________________

the crux of the biscuit, is the apostrophe.......
Fz
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Old 07-26-2012, 06:17 PM   #50
crawler07 OP
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thanks for all the replys on the piston question fellas, i decided to go ahead and cut the ports in the piston and i have ridden it a few miles already and the vibrations arent a problem. The ride was good and their was far less vibration than before the rebuild WOO HOObut Its not all good news this bike is kicking me back like crazy and im thinking its dur to being a bit out of time maybe to advanced?? Does anyone have any tips on adjusting timing on one of these? Im assuming the stator plate is adjustable? I cant find my flywheel puller I used when I replaced the crank seals a while back.. I have made a good bit of progress on it and here is a few pics for you guys..








Didnt do good with taking pics along the way, but i will be sure to post more detailed pics of the cb 350 thats the next project
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Old 07-29-2012, 01:14 PM   #51
Twin-shocker
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Looks a good job.............I have a guy here in the UK who makes very hight quality pistons, and those he makes for me for piston port motors, are exactly the same as the ones for reed valves, other than the reed ones have boost holes milled into them.

I guess your bike might have points ignition, and if so you could probably stop kick backs by closing the points gap a little?
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