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Author Topic: Montreal Manchild with an '81 Honda CB750K  (Read 37556 times)

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #820 on: Oct 01, 2017, 15:25:35 »
Ah, it seems that in Rhonda's exertions yesterday she may have slightly over done it.  Hope I didn't push her too hard, but there is most definitely a rather disconcerting noise coming out from behind the  timing cover.

At idle the noise is more of a rattle, but at around 2000rpm there's a rapid ticking sound.  I removed the cover to see if there was anything obvious going on but - to my eyes anyway - not so much.  Fearing the worst, hoping for the best.  It does not sound very healthy.

Any idea on where to start?

Looks like this thread may not be dead quite yet...
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #821 on: Oct 01, 2017, 16:25:59 »
Fixed it - there are three steel bolts behind the advancer unit, all three of which had backed out. Once I got the crankcase cover off I could get enough of a 12mm spanner onto them to tighten them up. No more ticking noise.




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

Offline esmoojee

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #822 on: Oct 01, 2017, 22:38:52 »
I believe thatís the three starter clutch bolts. Those back out all the time. If youíre not gonna do the R6 mod then I would suggest using red loctite on them or itíll keep happening.

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #823 on: Oct 02, 2017, 00:02:20 »
What sorcery is this R6 mod?
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline esmoojee

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #824 on: Oct 02, 2017, 03:27:17 »
hahaha itís an upgrade to the starter clutch. Here you go

Offline esmoojee

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #825 on: Oct 02, 2017, 03:28:14 »
Youíd be surprised how many upgrades and mods there are for these bikes.

Offline The Jimbonaut

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #826 on: Oct 02, 2017, 10:40:05 »
Ah cool, thanks man for the great vid.  Definitely something to consider.  Are there any other advantages to the R6 upgrade?  Or do you think thread locker on the bolts would do the job?

I'd love to know more about these kind of mods! 
"I'm telling you Donnie, nuthin' but nuthin' but right"

Offline esmoojee

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #827 on: Oct 03, 2017, 13:37:19 »
The R6 will last a long time, itís just a better design. The original starter clutches werenít great the bearings fail. Youíll know when it goes. The red loctite should last at least as long time. Just make sure you clean the oil off really well. 

Offline esmoojee

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Re: Montreal Manchild with an '81 Honda CB750K
« Reply #828 on: Oct 03, 2017, 13:39:26 »
Thereís a relay mod to charge the coils faster, thereís a shifting mod because from the factory the bike sometimes doesnít want to downshift properly. Um, thereís a clutch mod to make it smoother. So much you can do if you have the money.