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Author Topic: Possibly entering the 378 club!  (Read 4177 times)

Offline Brodie

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I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline Bone91

  • Posts: 26
Re: Possibly entering the 378 club!
« Reply #81 on: Jul 06, 2018, 02:40:20 »
Ahhh too easy Miniatureninja and thank you for the link Brodie

Sent from my SM-G930F using DO THE TON mobile app


Offline MiniatureNinja

  • Posts: 454
Re: Possibly entering the 378 club!
« Reply #82 on: Jul 06, 2018, 02:53:27 »
This will be my approach, minimise disruption and chance of putting it back together incorrectly!

Whatís the liklihood of case bolts breaking when i undo them?
Should i reuse old bolts or buy new?
Anything else to worry about?

Steve

there was a thread (a very detailed thread) on the hondatwins site back in 2012 or so, never finished and the guy disappeared but he broke several of those case bolts, I would be prepared for it and take it slow, considering that is must have been done in the past - since someone put a bolt in the tensioner arm, I would say be on the lookout for other things inside that may be improperly installed or missing
'75 Honda CB360 - thread

Offline Sderbyshire

  • Posts: 249
  • Into Sailing, classic Triumph cars and motorbikes.
Re: Possibly entering the 378 club!
« Reply #83 on: Jul 08, 2018, 08:55:07 »
So, valves arrived yesterday, from israel in 5 days !!!

Still awaitng the cam sprocket and bolts.

Iíve decided that although the cam tensioner is clearly Ďmodifiedí it has been working fine for the 3 years iíve had the bike so am going to put off separating the crankcases and get the motor running.

I want to see how itís working in 389cc configuration and then address any issues at the same time as the tensioner over the winter. There have been several bodges on this bike that have come to light during my ownership, so to be honest i dont want to uncover anything else in the crankcase unless i have to !

Watch out for updates when the sprocket and bolts arrive, hopefully this week.

Steve
Ps, shall be loctiting and tripple checking those pesky 7mm bolts !

Offline MiniatureNinja

  • Posts: 454
Re: Possibly entering the 378 club!
« Reply #84 on: Jul 08, 2018, 20:26:09 »
I never loctited mine and I'm just crossing my fingers everything inside there doesn't explode.

I already got a scare when I left the points advancer/cam bolt off and the bike jumped ignition timing, back-firing loudly before dying the very first time I started it up...
hope that is all the scare for my bike!

as for opening up cans of worms - yea save it for the winter!
'75 Honda CB360 - thread

Offline crazypj

  • Posts: 13155
  • Split personality, I fake being smart
Re: Possibly entering the 378 club!
« Reply #85 on: Jul 09, 2018, 16:37:58 »
Case bolts should come out pretty easy. Never had a problem re-using them. It may be a good idea to get a flat punch and 'shock' them with a sharp smack before trying to unscrew though. I've done full stip, all mods, new cam chain and tensioner 'horseshoe' in about 10 hrs (from bad runner to good runner, engine in and out etc) Not sure if I could do it as fast today though as arm and back are pretty messed up plus I'm 10 yrs older  ;D
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline advCo

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Re: Possibly entering the 378 club!
« Reply #86 on: Jul 10, 2018, 12:13:14 »
Pretty sure I use a couple of taps with an electric impact to break them loose on both the CB360 (I had to split the cases like 3 times on that bike  ;D) and the XL, haven't broken one yet.

The small taps are better than a breaker bar with a lot of leverage IMO with those long collared case bolts. In any case they aren't torqued very high so they shouldn't take that much force to break loose.

That being said if you haven't had any issues with the tensioner I wouldn't even bother messing with it.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0 - Sold
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0 - Sold
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0
'97 BMW F650st - http://www.dotheton.com/forum/index.php?topic=75732.0

Offline Sderbyshire

  • Posts: 249
  • Into Sailing, classic Triumph cars and motorbikes.
Re: Possibly entering the 378 club!
« Reply #87 on: Jul 14, 2018, 13:58:39 »
In the absence of engine parts, seem to be coming from the us to the uk by donkey...... i thought iíd tidy up the tail end and do some badge engineering :-)

The 70mm pistons equate to a displacement of 389.4cc which is pretty close to 390cc..... and a 9 is an upside down 6.......

Careful work with hacksaw and dremel and we have a CB390 !


Offline Sderbyshire

  • Posts: 249
  • Into Sailing, classic Triumph cars and motorbikes.
Re: Possibly entering the 378 club!
« Reply #88 on: Jul 14, 2018, 14:00:26 »
Arty garden shot......

Offline MiniatureNinja

  • Posts: 454
Re: Possibly entering the 378 club!
« Reply #89 on: Jul 14, 2018, 14:28:20 »
How cool is that! I have thought about modifying the cylinder badge by making it say "376" but thats ok... I'll stick to explaining (bragging) that it's really a 380 anyway
'75 Honda CB360 - thread