Recent content by Frenchtom

Hope these are at the right angle. Thanks for the help!

I do not know how to figure out which Mikunis I have. There is very little writing on them. Does a picture help?

I have the stock Mikunis from the original 750 engine. I think I went 165 main jet and 47.5 primary jet but thinking about that now, those might be too big. I have not decided on the air cleaner. I have the stock air cleaner box and I may try to put high flow filters inside or I may roll the...

Too long since last update. Added a new front tire, installed the engine with a new digital electronics system, new handlebars, rebuilt and re-jetted the carbs, rebuilt the starter, and painted a bunch of stuff. Now I am trying to get my calipers un seized. I was really surprised how bad of...

Been a while but I have made some progress. The cases are painted and the cylinder is installed. That was an interesting struggle to say the least. I also lapped the valves and it passed the water leak test with flying colors. Next I will remove the solid state timing and adjust its setting...

Yup, that sounds logical. I installed the pistons, rings and cylinder over the weekend. Thanks for the insight!

Hi folks! I am building a Yamaha XS850 engine into an 896cc via a big bore kit. I got the new pistons and rings from CruzinImage and was pleased with their quality. However, when I measured the end gap in the rings, I found them to measure 0.014". The factory specification calls for 0.008" -...

I did have one valve seat that looks lightly damaged and pitted like something got sucked through and was pinched by the valve a few dozen times before it left the engine. I am hoping that lapping the valves will smooth out the pitting.

More progress - Got the cylinders painted and cleaned the head up real nice. I found some neat wire brushes on Amazon that fit rotary tools. When you spin them up the wires spread out and clean between the fins really well. One concern I have is that the manual states a 0.008" - 0.016" ring...

If ever there was a reason to check a prior owner's project work, here is a textbook example. This is the upper half of my engine case where I have partially removed a crank bearing. The bearing in this location is supposed to be a thrust bearing but the prior owner used a conventional...

So I am trying to figure out what connecting rod bearing size I need to order but cannot figure it out. My Haynes manual says to subtract a number stamped on the crank from a number stamped on the connecting rod. My Connecting rod is stamped 4 and the crank is stamped 2. The difference is the...

I plastigauged the main journal bearings with real good results. They all came in at 0.002" which is right in the middle of the 0.001" - 0.003" specification. I need to replace one journal bearing and one rod bearing so I will be surfing EBay this weekend.