Hi guys,
I´m posting here in behalf of my dad regarding the engine of his A7.
Just one season, and he is in need of an engine rebuild (engine was knocking quite badly one day).
I took the engine apart for an inspection. The Conrod shells are definately worn. The timing side one was completely down to the copper (I think they were 3 material ones), had heat discoloring (green-black) and had gouges (from particles?).
Crankshaft needs to be ground and cylinders need a bore/hone.
Questions:
1. Pistons now are +60. Are there +80 available for the A7SS (are SS and std the same?). Or is it a better idea to get new liners? Are there any problems concerning the fitting of new liners?
2. Is there any explenation of why there is an oil in the primary side conrod, but not the timing side one? What is the reason for this hole? It can´t be to spray oil under the pistons, because just one of the cylinders has it?!?
3. Are there experiences regarding the longevity of the engine when fitting a real paper oilfilter and/or the SRM upgraded oilpump?
4. Is there anything special to the A7 (I´m not used to that old bikes) I sould pay attention to? I opened the sludge trap already, but it wasn´t really much in it.
I appreciate your answers.
Thanks a lot!