I have a GXV 120 Honda engine from 1987 on a HR214 SMA mower. We have had it since new and has been used regularly every year. It has been getting worse at smoking and now smokes like crazy when started cold. The smoke finally tapers off but never stops completely. It also is down on power since it will die if you engage the blade before it warms up for a couple of minutes.
I have taken it apart and it was very clean inside except for carbon in the exhaust ports and cylinder head. Everything else looks very good. As best as I can measure the bore it is 6.00 mm. Ring gaps are top .016 middle .022 oil .045. Valves have very little play in the guides and the valve seats are narrow at .035". Valve stem diameters are still standard. Valve lash was .012' on intake and exhaust.
Except for the smoking and loss of power the engine appears to be in excellent condition for it's age.
I plan on putting a new set of rings in it along with new seals and gaskets. I have a ball hone that I plan to use on the cylinder. What would be best for a fluid to use with the hone?
Also the lining on the blade brake/engagement disc is about .10" thick. Does anyone know what the new thickness is or what the service limit is?
Any help tips or suggestions would be appreciated. There is a small piece of steel mesh in the oil breather area. I'm not quite sure where it is supposed to go. I think it should go down and cover the hole that leads to the air cleaner. is this right.
