N nokturnal Member Nov 15, 2013 #1 Is this normal for the coating to come off like this? I know wearing off is normal, but I have not seen these blobby spots before... It's an S3 top-end/cylinder kit. ~15h on it. What do you think?? TIA
Is this normal for the coating to come off like this? I know wearing off is normal, but I have not seen these blobby spots before... It's an S3 top-end/cylinder kit. ~15h on it. What do you think?? TIA
A AZRickD New member Nov 15, 2013 #2 Looks like a low-pressure fluid flow after shut down rather than a high compression blow-by.
N nokturnal Member Nov 15, 2013 #3 to be clear, i am talking about the silver blob marks, where it appears the "moly"(??) coating has worn/chipped off.
to be clear, i am talking about the silver blob marks, where it appears the "moly"(??) coating has worn/chipped off.
N nokturnal Member Nov 15, 2013 #4 AZRickD said: Looks like a low-pressure fluid flow after shut down rather than a high compression blow-by. Click to expand... Are you saying something (like gas?) is eating the coating off after shutdown?
AZRickD said: Looks like a low-pressure fluid flow after shut down rather than a high compression blow-by. Click to expand... Are you saying something (like gas?) is eating the coating off after shutdown?
adv rider Platinum Level Site Supporter Nov 16, 2013 #5 strange pattern I am having trouble w pic. Is that the piston skirt, or is it cylinder wall w piston at bdc? Either way, i have never seen that. Just trying to understand what i am looking at.
strange pattern I am having trouble w pic. Is that the piston skirt, or is it cylinder wall w piston at bdc? Either way, i have never seen that. Just trying to understand what i am looking at.
Jakobi Super Moderator Nov 16, 2013 #6 Its piston skirt. I've not seen the coating wear off like that either..
N nokturnal Member Nov 16, 2013 #7 Yep. It's the skirt and you can't feel them. Someone with a lot of experience with engine building figures it was just not cleaned well prior to coating.
Yep. It's the skirt and you can't feel them. Someone with a lot of experience with engine building figures it was just not cleaned well prior to coating.
gasgasman Super Moderator Staff member Nov 16, 2013 #8 Mine are like that. Probably from the ethanol blended swill.
N nokturnal Member Nov 16, 2013 #9 no ethanol has touched this engine since I have owned the bike. well before rebuild.
V vmxwinn New member Nov 18, 2013 #10 The coating on my Worsner piston came off too, but a little more uniformly. See you on the RZ site also.
The coating on my Worsner piston came off too, but a little more uniformly. See you on the RZ site also.
