Topic: Help in ID parts please

[Swoop]

Hi there,
I picked up a sandcast last year to restore and finally got around to opening up the siezed motor.
It has spun a rod bearing on the crank. Q1- Is it worth repariing/ expensive?
This bike came with a set of 65 mm pistons...no markings (but I haven't cleaned them up yet...I think it is an 836 piston...Q2-how do I tell the compresion ratio? Any thoughts on how to free a stuck ring?

This bike came with a spare K0 motor, trashed cam and journals. I opened it up to see if I can use the crank and it has 64 mm piistons and alloy rods (ART). The rods are marked Forged on 1 side and MC Japan on the other. Q3- Any thoughts on what kit these are from and CR? Any thoughts on the rods...I have read that alloy forged rods are not too popular now and a bit overrated.

I plan on putting stock equipment back into the Sandcast and have another K0 donor motor for that if I dont repair the crank or use the one with the alloys. I am also thinking of making a K0 project later and using some of the goodies i am finding for that.

I have posted pics.....ART piston 64 mm on the right - ? 65 mm on the left.

Any help will be appreciated as I can't find anything on MC Japan Alloy rods on the net so far.

Thanks

Steve

[bryanj]

If a rod bearing has spun you will need a "new" crank and rod as the crank cannot be ground (OK it can but nobody makes undersize shells) and the rod will be oval easiest is to transplant a later one, as to the rest of it cant help there sorry

[Jerry Rxman Griffin aka MuthaF'er]

Steve,

The 64 is from a 810 kit. Can't ID from the pix. My 810 is Yoshimura. There were others out there also but did not seem as popular as 836. I used 810 to save room for the next time I blew it up. It's been quite a while since I've seen my pistons.(uses 1968-1972ish CB 350 rings!!) I think they are manufactured by ART whoever the hell that is. I think it's the same manufacturer as Honda. I do not believe however that mine have as much CR as what yours looks to have. Mine are 10.25 I think. You may have some 12.5. Any other markings at all? I seem to recall that there was something else on mine. Operative word here is "think'. Looks like you have the makings for a fast engine. Call APE/look up about the crank. They do rebuilds, lighten and balance. If they can repair it and you're going to "build" an engine may as well have the lightening and balancing done at the same time.   
Jerry

[Swoop]

Thanks for he help....the 65 mm has RAND or IRAND stampd inside it......
Great ......I got a set of air compressor pistons.   

[chung]

Sounds like great fun, stock is soooooooo boring (no pun intended) I would try to transplant to entire assembly into the KO cases. Crank, bearings, rods, cly case and pistons. If it was done proper then it's all balanced and a few extra CCs never hurts. If the line bore is the same size on both cases then go for it m8.

Check the K1 head too, might have some goodies there as well. HD springs, oversize valves ect. Do yourself a favor and use steel thread inserts on all the fasteners on the head. They rarely make it past the first installation.