Originally Posted by Roelof (Post 11316350)

Before the coated pistons there were a lot of issues with damaged pistons at the exhaust port, they looked like they had to less lubrication in conbination with a tight pinch and so the surface of the piston showed as it was rubbed.

The coating was a some kind of DLC which creates a very low friction surface. But after running in the part where it touched the sleeve most had no coating anymore. Probably they have done it to give it a smoother run-in for not damaging the piston.
In the real automotive industry (as I was tod for sure with Mercedes) this is also done a lot on the crankpins.

Originally Posted by kyosho malaysia (Post 11296591)

use 97,99 will lost some power

Originally Posted by Roelof (Post 11316487)

I would go for the rocksolid 35-plus-21 with a steel bearing.

Originally Posted by Roelof (Post 11336895)

Which Collari?

Originally Posted by Roelof (Post 11338896)

The Collari WC09 has the R7 rod again and som other advantages. So if you can get it for (almost) the same price it is a good choice.

Originally Posted by speed6 (Post 11326623)

Yesterday i tried using odonnel 77 and after inspecting the plug it did look like the underneath whole is much bigger than the nova one so compression is reduced and it was also felt on the track especially the acceleration.

Am i right or is the clutch slipping a bit :)

Engine is a 12PT

Originally Posted by howard85may (Post 11358274)

What's the best way to break in a keep on .21? Thanks.

Originally Posted by Grinder (Post 11358301)

Originally Posted by howard85may (Post 11360261)

Step 2, when you say establish a rich idle, do you mean start it at factory settings or lean it on the top or bottom a little?

Step 3, is that continuous 750cc of fuel or heat cycle every tank until 750cc has been run?

Step 4, same question as step three, heat cycle every tank or continuous for 750cc?

Thanks for all your help. You're deffinately an asset to this hobby.

Originally Posted by Grinder (Post 11363243)

Rich idle usually means factory settings. Just make the idle where it will not shut off, and some raw fuel is coming out of the exhaust.

No need to heat cycle each tank. In between each 750cc is fine.

Originally Posted by howard85may (Post 11363693)

http://www.youtube.com/watch?v=JT2GQr9UEoM

How's this look? Nothing special, just starting the break in process. Idled through 150cc tank today. Next step tomorrow. So for the next step, should i just leave the needle settings as they are from factory and run it for another 750cc or should i lean it a little? Thanks for the help.