pwizl
XS650 Addict
Blasted the cases, got them primed and painted. Also chased all the threads, with some help, on each case half to get ready for assembly this weekend.
Picked up a nice set of used cylinders on the cheap, old ones would have to be bored out and the cost of that plus new oversized pistons and rings just didn't make sense. The original pistons are in great shape, so new rings and the new cylinders were much cheaper. - - -
Hi pwizl,
awesome job so far and I look forward to seeing the finished product.
OK, not to diss you but some folks do have gaps in their tech info.
New rings must be gapped before install and your post don't say you did so.
True that!! Haven't done the pistons yet though. Actually planning on doing all the gaps tonight
I was just saying that getting new rings and a good set of used cylinders was cheaper than trying to save that originals after boring and having to buy oversized pistons and rings.
Thanks for keeping an eye on me though fredintoon , I need all the help I can get!!
Have you measured the bore diameter of the used cylinders you bought, to be sure they match up with your existing pistons. Piston to cylinder clearance is important, as is cylinder taper. Specs are in the Yamaha Service Manual.
Awesome finish on everything! I wish I had the patients to make everything so perfect.
You're doing a fine job on the engine re-build
Here's a method I used a few years ago to install the cylinders and pistons:
The following method makes installing the cylinders/pistons very easy.
Place the cylinders upside down on the bench.Install the inner wrist pin circlips into both pistons at the same time you install rings and then put the pistons fully into the cylinders from the bottom. A popsicle stick works well to guide the rings past the chamfered edge on the cylinder bottom. No ring compressor needed.
Install cylinder base gasket. Rotate the engine to stand on its nose, so that the cylinders/pistons can slide onto the studs horizontally. Slide the cylinders/pistons down the studs,feeding cam chain as you go. I used a clamp to hold the conn rods just below the cylinder bottom. Tap the pistons down until holes line up for the wrist pins. Install the wrist pins and outer circ clips. Remove clamp and slide the cylinders fully into the crankcase. Rotate engine so cylinders are vertical again. Carry on with front camchain guide, camshaft/bearings etc.
With this method, you're not fighting with the weight of the cylinders and less chance of the camchain falling downward.