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I know the CB350 is really a 325cc motor with 64mm pistons. The CB360 is a 358cc motor with 67mm pistons. I'm not sure if the stroke is the same or what (if any) similarities in tolerances there are in the bottom ends, but I'm pretty sure the motors don't mount up the same way. I have a 360 over at a friends house for storage. I can verify this for certain if you'd like.
I got the S12 (3mm) overbore pistons for my 350 making it a 358. Couldn't find the S12 rings though. The awesome folks at Bore Tech hipped me to the fact that the 360 rings would work. Loe and behold, they did. Good thing to know about the wrist pin though. We were going to steal the 360 pistons out of the 360 my buddy and I have for his 350 motor rebuild. Glad to know it won't work before we wasted any time trying.
FYI, the 360 we picked up for $40 and it is all of $40 worth of motorcycle. SERIOUS basket case. Just a shade worse then the 71 350 we rescued from a marsh. When we unloaded that bike from the van snakes came flying out of the mufflers! Seriously. It was hilarious. Got the bike running though. 9 years on its side in a marshy area and it fired up without rebuilding the motor (just carbs, points, and condensers). A real testament to the durability of these little bikes. The motor is week as hell though so that's why it's being rebuilt. Still we were tickled it started and ran at all.
The CL360 I'm getting is all there, just in many boxes. The guy said it was smoking really bad when he parked it ~8 years ago and never did anything else with it. Then he let his nephews get some experience working on things by taking it apart which is why it comes to me in boxes. I can't complain much since he is giving it to me for free and he's even delivering it the 1.5 hours (one way) for free too. I had to convince him to let me buy him lunch/dinner. It's my first bike so even if I for some reason can't get it running it won' be like I have a bunch of money tied up in it. We were talking earlier today and I mentioned I have a lot of experience working on muscle cars and hot rods but none working with bikes and he said I should let him know if I ever need him to come over to help out. He is officially my new best friend. lol
The pictures he sent me show there is almost no rust anywhere even inside the tanks he's giving me and the exhaust setups he said he would bring too. This is going real off topic, but how much do you think it would cost to rebuild the motor to stock specs? How much to rebuild the suspension to stock specs? How much to rebuild the drum brakes to stock specs? I know you don't have much to go off of, but assuming nothing has been touched for 8 years, what would you guys/gals guess?
For Free? Nice. Congratulations you officially are the proud owner of one of the best bikes to learn how to work on. If you have experience with other motors your going to be fine. As far as costs go, look around a lot. Some places can be a bit pricey with NOS parts but certain after market options which are perfectly fine are available. eBay has TONS of stuff.
If the bike was smoking bad I'd say on the low side it may need rings or valves. Possibly new valve seats. All affordable and not really that tough to do. On the high side maybe pistons and getting your cylinder honed or possibly over bored if there is any significant damage to the cylinder wall. Still not to expensive even if you have to take it to a shop for honing/boring. I'm getting a 3mm over bore done and the shop is charging me $75.
While your inside the motor you have an opportunity to make a few of the designs weaker points better. I recommend replacing the cam chain with a stronger one like a Tsubaki and also replacing the horrible rubber tensioner with something like the KA Performance cam chain slider. Also a bit of port, polish, and flow on the head couldn't hurt. You can also improve clutch performance with some Barnett Kevlar friction disks and alloy disks plus heavier clutch springs if you like. All of the above are very affordable and readily available.
I got my Cam chain, slider, and clutch parts from http://www.bore-tech.com check out their site and give them a call if you have any questions. They were extremely helpful in answering many of my questions about my motor build. Great folks. I give them an A+ in the customer service department. Good luck with your new project. Post some pics when it arrives.
I got some NOS S12 pistons made by Rocky off eBay for $9. Funny thing is same day I found a NOS head gasket. What are the chances? Haven't seen one since. Bore Tech sells some 67.5 pistons and rings. They're really nice but a bit on the pricey side.
Believe it or not,,,bore tech price is cheap, this side of the border stock .050mm c\w rings, pins ,keepers were well over $200 a side....that was 7yrs ago
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