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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.

Got all three connecting rod journals plasti-gauged and they all passed. The attached showed the smooshed out strip on conrod #3. I'll move on the gauging the crank journals over the next few days.

So I cut the shaft and got that nut removed. That allowed me to split the cases and check out the second crank. It looks like the second crank is in better shape than the crank that was in the first engine so it looks like I can avoid a machine shop visit to dress the first crank. The next...

Those are great ideas. I do have some impact sockets that I could sacrifice for the cause but I do not have a welding machine nor do I know how to weld. I tried a bit of the air chisel idea but its pretty hard keeping the chisel centered on the nut. It jumps and skips around so much I end up...

Hi Guys - I used to read old messages from folks who would go months or years between updates and think to myself - wow, those guys are unmotivated. I am now typing one year after my last update with no progress in between. That is what life with young kids, old parents and career changes will...

So a bit of an update ... I got all of the old gasket material removed from all of the case surfaces and polished them up in good shape. I still need to pull the crank from my spare engine to see if it is better than my old crank. The next big thing will be blasting everything with disc brake...