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Author Topic: '74 cb360 build  (Read 1628 times)

Offline nismoman8899

  • Posts: 59
Re: '74 cb360 build
« Reply #10 on: Feb 11, 2017, 19:02:36 »
Email set for every hour to check for new mail haha.  I was debating on purchasing the  4 i posted but didnt let others go for it. Let me know if you do decide to sell 2. Im in illinois

Offline redwillissuperman

  • Posts: 990
  • Keep it simple- engine, wheels, bars
Re: '74 cb360 build
« Reply #11 on: Feb 11, 2017, 22:03:48 »
Email set for every hour to check for new mail haha.  I was debating on purchasing the  4 i posted but didnt let others go for it. Let me know if you do decide to sell 2. Im in illinois

I'm making sleeves for the 69.5mm.  That makes displacement 385cc. I have a backup plan if that's not enough speed-


Offline nismoman8899

  • Posts: 59
Re: '74 cb360 build
« Reply #12 on: Feb 11, 2017, 23:44:49 »
Nice!

Offline randy lahey

  • Posts: 30
Re: '74 cb360 build
« Reply #13 on: Mar 19, 2017, 11:46:21 »
It's been a little while since my last post and I'm bored at work so I figured I'd give a little update.  I've pretty much got the wheels built.  I had the hubs powder coated, used new spokes from 4 into 1, and rims from mikesxs.  I've built bmx wheels in the past and didn't find it too challenging, but never motorcycle wheels. This was a little more complicated due to the mikesxs rims being a little rough around the seam, and also my lack of a proper truing stand.  I didn't want to buy a stand figuring I could just make one, but instead I improvised.  I also got a pair of second hand shinko 244 tires that were never used for $30 a piece!

I've also got the bottom end of the engine together.  I sandblasted all the covers and painted them with flat black engine enamel.  I got a set of stainless hex head bolts which is kinda essential considering how fucked up the stock phillips bolts get.  I'm not using the electric start So I removed everything involved with that.  For the starter hole I've heard that a freeze plug works to block that but I haven't got one yet.

I am going the 378cc route and I've got the pistons and cylinders back from the machine shop, got the gs850 rings, and a head gasket ordered from coppergaskets.us.  I did have to order new cam chain tensioners because out of the two engines I have, the slipper on one is broken and the other one is missing.....apparently a common problem with these things.

I have some free time coming up and a lot of the parts and stuff I need, so hopefully next update won't be too far away.  Spring is also fast approaching so i kinda gotta get a move on.  Next update should have wheels mounted, and all or at least part of the top end done.


Offline HURCO550

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  • Posts: 2873
  • Life is short. Smile while you still have teeth.
Re: '74 cb360 build
« Reply #14 on: Mar 19, 2017, 23:29:05 »
Looking great man! I'm a sucker for shouldered aluminium hoops too. Nice work
Keep er' Between The Ditches!!!

1976 BMW R90/6 farkilitious: http://www.dotheton.com/forum/index.php?topic=74349.msg882477#msg882477
1975 RD350 Road Racer: http://www.dotheton.com/forum/index.php?topic=70652.msg833688#msg833688
1973 Ironhead Hardtail: http://www.dotheton.com/forum/index.php?topic=68135.msg788081#msg788081
1976 GT250 Rebuild: http://www.dotheton.com/forum/index.php?topic=64973.new#new
Full Custom Pit Bike: http://www.dotheton.com/forum/index.php?topic=66954.new#new
1971 Yamaha 90cc twin HS1: http://www.dotheton.com/forum/index.php?topic=70498.0
"Two strokes are the motorcycle equivalent to Thors chariot. Full of glory and memories of battles victorious" ~ von yinzer
"Are there any die hard KZ550LTD fans in existence?" ~ doc_rot

Offline randy lahey

  • Posts: 30
Re: '74 cb360 build
« Reply #15 on: Apr 14, 2017, 08:25:13 »
Well I've gotten quite a bit done since my last post.  I've been meaning to update my progress a little more, but I'd rather be working on my bike than writing about the work I've done on my bike  ;D.  Anyways, I've got the engine finished, and the wheels built and mounted.

So as I mentioned earlier, I had the cylinders bored and fitted with gs850 pistons.  The bottom end internals checked out so I just cleaned and reassembled with new seals and gaskets.  It only had about 11,000 miles (or kilometers?) on it, so it wasn't in too bad of shape.  As for the top end, with the conversion i had get a copper gasket from coppergaskets.us at .4 thickness, which is a little thinner than stock.  I cleaned up the cylinder head (although it did have some damage in one cylinder that apparently I didn't take a picture of, I don't think it will have any effect.), half-ass polished the exhaust ports, and lapped the valves.  Unfortunately once I got the head torqued down, i realized the spark plug threads were pretty chewed up on one cylinder, but I just so happened to have a spark plug thread repair kit to fix that.  I degree'd the cam and it was about 3 degrees advanced, which should give it a little more low end power at the sacrifice of losing some off the top end, but given the high RPM oiling problems of these engines, I figured that's a good thing. 

The wheels are mounted with shinko 244 tires, 3.00x18 on the front and 3.5x18 on the rear.  My choice of these tires was based on getting a used set that had never been used for $30 a piece, but also because that's pretty much the look I'm going for. 

Sorry for the shitty pictures, my "workshop" is in my dank old farmhouse basement and the lighting sucks.