possum Posted September 5, 2013 Report Share Posted September 5, 2013 Good luck. Literally Quote Link to comment Share on other sites More sharing options...
apeik Posted September 13, 2013 Author Report Share Posted September 13, 2013 just got cylinders back from millennium this morning, they did a beautiful job on the nikasil/hone/chamfer. Get some time next week ill get it togather and see how squish/comp comes out. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted September 14, 2013 Report Share Posted September 14, 2013 I wasn't aware that they always chamfered them. Did they come back blue? The usually come back like new. Quote Link to comment Share on other sites More sharing options...
apeik Posted September 14, 2013 Author Report Share Posted September 14, 2013 i got them back and painted them. im pretty sure they chamfer all 2 stroke ports? Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 18, 2013 Report Share Posted September 18, 2013 mine have always come back like that from them Quote Link to comment Share on other sites More sharing options...
apeik Posted September 18, 2013 Author Report Share Posted September 18, 2013 Upon closer inspection, my pistons i ran for maybe 5 +/- hours in the cylinders before i got them replated are pretty much wrecked. guess the ''ready to run'' cylinders weren't so ready to run. New set of pistons on the way. Anyone ever seen them wear so quick/bad across the intake bridge? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted September 18, 2013 Report Share Posted September 18, 2013 Yes. That happens pretty quick sometimes. On the bigger bore engines it looks like that immediately, and just gets worse. If your ring end gap is in spec on those, I'd run them. Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted September 19, 2013 Report Share Posted September 19, 2013 Nikasil is hard stuff...seems to scar the pistons pretty quick Quote Link to comment Share on other sites More sharing options...
mike0chek Posted September 19, 2013 Report Share Posted September 19, 2013 yup my cub gets the same wear with about the same run time Quote Link to comment Share on other sites More sharing options...
dirtydownunder Posted September 19, 2013 Report Share Posted September 19, 2013 they look better than mine, after 4 hrs. Quote Link to comment Share on other sites More sharing options...
apeik Posted September 19, 2013 Author Report Share Posted September 19, 2013 well damn, never had pistons look this bad after 40 hours in a steel bore and being run to death. Guess the nikasil is just really hard on aluminum. The pistons are already on the way, so i guess ill just keep the old one's for backup's. Just concerned me with the massive wear on the bottom corners of the skirts(piston rocking), and the flat spot across the intake bridge on one. Oddly one piston looks quite a bit better than the other. Learned something new though, thanks for all the input guy's. Also i ended up using a dgk needle with my new 35 pwk's last time because that's the only way it would run even close to right on the vp q16, but on pump gas im thinking about starting out at 162main, cel 4th clip, 48 pilot when i get it back together as a starting point. Last time i could never get it jetted right no matter what i tried im guessing because of detonation and the domes. Quote Link to comment Share on other sites More sharing options...
m671054 Posted September 19, 2013 Report Share Posted September 19, 2013 Check out milleniums site for cleaning info after a replate. i thought they were cleaned before shipping but they say they need to be cleaned more. i bet this is causing most of the wear Quote Link to comment Share on other sites More sharing options...
apeik Posted September 19, 2013 Author Report Share Posted September 19, 2013 m67, the wear was from before the replate, the fresh cylinders are still sitting on the bench waiting for be wiped down with 2stroke oil, i already washed them out with soap and water and put new water jacket plugs and put the studs back in. They had to be pretty egg shaped before, you could hear the piston slapping at idle, i think it's time to buy a bore gauge so i know for sure next time. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted September 19, 2013 Report Share Posted September 19, 2013 Clean the bore with brake cleaner before assembly. Quote Link to comment Share on other sites More sharing options...
cjc Posted September 22, 2013 Report Share Posted September 22, 2013 Clean the bore with brake cleaner before assembly. then use dextron atf on a white lint free cloth and wipe out the cylinder till it stops leaving trace on the cloth. then clean it again with brake cleaner to remove atf. the atf is great at pulling crud out of the pores. Quote Link to comment Share on other sites More sharing options...
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