Reusing 2 Stroke parts after a seizure !

[cello]

Having had a barrel fail after it was replated and used in conjuntion with new psiton /rings /little end/etc , is it safe to re use the little end , gudgeon pin and piston ring #( visual inspection looks unscathed ) .

Having today rebuilt the engine after the platers ( should be wasters ) replated the barrel to fit the original used piston , with one new piston ring , one original old and new gudgeon pin / little end - NEW = 2 hours use but in the bike when it seized , there is a prenounced tapping nosie from the top end .

The bike appears to run ok , no smoke , with the compression back to the point when I decided to treat it to asome TLC - replate / new piston . Question is whats the tapping noise ? Is it safe to run for a period of time to determine if the plating will survive long enough to warrant chancing a new piston again . Another failure will financialy cripple me ? Anyone know if you can get a aftermarket piston to save me being ripped of by Husky prices - Bikes a 1996 Husqvarna WR250. :p

 

[georgieboy]

Cello, if i understand correctly you had yr cilinder replated and now wants to reuse certain parts.
Most often everybody reuses his bigend and rod, with that you may reuse the smallend bearings if they look shiny and good(not blue). I have reuse my pin, and also one time the clips(i am not proud of that, but i lost a clip and wanted to ride). Go with a new piston and rings though as you had a expensive replateing done.
Make very sure that you lay back the exhaust bridge for 0.05mm, (use a dremel) or you will have a mega seizure on hands. I speak outof experience here.

Sorry, i just reread what you have written.
Oke, so you already have reuses these parts, fine. When it works and were within specs, fine.
The tapping cld be the rings hitting the exhaust bridge. When you did not lay back the exhaust bridge it will hit the rings when the cilinder warms up.
Since the bridge is not cooled, it will expands rapidly, causing zero clearence between piston and cilinder/bridge.
To come back on the pistons question. Since yo already had the replating done, you shld have yr piston ready, right. Well, next year or o, you cld go for an aftermarket piston. I have found one for my huskie year 1998, same engine though, and it is a woesnner piston from germany.
Much cheaper and it is forged, so even stronger than the originals.
good luck bibi george