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Author Topic: Montreal Manchild with an '81 Honda CB750K  (Read 37638 times)

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #10 on: Nov 17, 2016, 14:30:49 »
And for fear of sounding like a total wally (it won't be the last time I doubt), is this the checklist I should be going through? -

http://www.cb750c.com/publicdocs/CB750_Manual/Honda1979thru83CB750ServiceManualChapter03InspectionandAdjustment.pdf

It's the Inspection and Adjustment section of the manual.

Thanks,

- J
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline Tim

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #11 on: Nov 18, 2016, 01:58:03 »
I'm in Montreal often.  Just landed from Vancouver (1am now) to be home for 12 hours then I'm flying into Montreal for the evening Friday.

Maybe on a longer trip there we should get the other Montreal members together. I think there are a few.
"Quality . . . you know what it is, yet you don't know what it is. But that's self-contradictory. But some things are better than others, that is, they have more quality. But when you try to say what the quality is, apart from the things that have it, it all goes poof! There's nothing to talk about. But if you can't say what Quality is, how do you know what it is, or how do you know that it even exists? If no one knows what it is, then for all practical purposes it doesn't exist at all. But for all practical purposes it really does exist."

Offline yorkie350

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #12 on: Nov 18, 2016, 07:29:58 »
Welcome in mate, clean looking starter bike you got there, plenty of knowledge on here so your not gonna be left high n dry remember to take plenty of pic's ask lots of questions but make it your own style ! you the one riding "RHONDA" enjoy the journey always here for Q&A's mate .
Life's too short to go slow at anything !  unless your re-building ya ride !!

 cb350f '72 café racer 
 cb550f '78 Hailwood race rep

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #13 on: Nov 18, 2016, 13:28:28 »
Cheers guys - Tim you should definitely let me know whenever you're in town and jonesing for a ride.  There are some great roads all around here - up north we've got the Laurentian mountains and to the south are the Eastern Townships...east towards the Gaspe peninsula, man it's all good =)

Thanks Yorkie, I'll definitely take you up on that...learning as I go along here and wanting to do as much work as possible on the bike myself.  Will need some help as I go along for sure so thanks again.  Going through Inspection chapter in the owners manual yesterday, I got to the cam chain adjustment and realized a previous owner had stripped the thread holding the tensioner bolt.  There was a lot of oil on the front of the engine and I guess that was responsible for at least some of it.  I've already been told that I'll need to re-thread it with a helicoil so that's on the to-do list, and hoping to get a mechanic over to have a listen to the engine and run a compression test on the cylinders (I don't have those tools sadly).

I'll definitely post pictures as I go along =)

Thanks again, and high fives from MTL,

- J
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline farmer92

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #14 on: Nov 18, 2016, 15:35:13 »
Since no one offered a high five back, i cant leave you hanging like that ;)
High five from Sherbrooke, just down the 10 from ya
 

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #15 on: Nov 21, 2016, 10:46:44 »
Good man Farmer, right back at ya =)  Lovely part of the world you live in, spent a lot of time in the Eastern Townships this summer riding with a buddy of mine.  You woke up to a dump of snow this morning?  Dammit, this winter thing sucks.

Ran my compression test over the weekend, here's how the numbers look (tested on a cold but cranking engine) -

cylinder 1 - 120
cylinder 2 - 120
cylinder 3 - 130
cylinder 4 - 100

I'm no mechanic but I think those numbers could be a lot worse...
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline advCo

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #16 on: Nov 21, 2016, 13:45:15 »
#4 is cause for concern. I would put a few squirts of oil in the spark plug hole and run the test again. If the compression goes up at all, the rings are worn or stuck. If you're going to do rings on one, you may as well just have all the cylinders/pistons measured and proceed accordingly.

« Last Edit: Nov 21, 2016, 13:47:03 by advCo »
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

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Offline farmer92

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #17 on: Nov 21, 2016, 19:28:52 »


Ya,just a wee bit of snow here...
Assembly time has arrived prematurely

+1 to what advco said
And when in doubt, replace/fix

I was a big fan of "if it ain't broke..."
Then my TC digested half a ring.
Just out of curiosity was the throttle wide open when doing the test?
If not, it can lower the reading on your gauge.

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #18 on: Nov 21, 2016, 20:29:49 »
Aaaaaarghhh it's the white stuff.  Probably not the last we'll see this winter either.  Had to plough 6" off the car this morning...man California must be nice this time of year...

Actually no, only cranked the engine, throttle was definitely not fully open.  In fact I don't remember revving the engine at all...

 
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline farmer92

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #19 on: Nov 21, 2016, 21:43:23 »
Ya... engine should be off
Remove the 4 plugs so it turns over easier

Crack throttle wide open
Turn it over for 10 secs or so.