Making your own manual CCT

[Visitor Q]

Right, in essence I think its safe to say the CBR has eaten another CCT.

Irritating, especially as I'm poor and David Silver spares wants 50 quid for a new one, and its only been about 10k since the last one.

I've just found out about manual ones, which is news to me as I assumed the camchain actually moved in and out and needed constant variance (ala pedal bike drive chains with that little tensioner behind the rear wheel gear stack).

Having remembered I had an old CCT lying about, and seeing just how simple the manual ones are (despite wanting £50 quid for them), I was wondering if anyone had considered machining their own? Or for that matter, converting the CCT body in to a manual one.

It's not as mad as it sounds, on the CBR one the top off the CCT when hollowed out has a ~6mm thread, and the actual rounded bit that contacts the blade/guide is encased within a sleeve that naturally fits within the CCT and is retained (regardless of spring).

So, if I were to source a long enough bolt and a nut that fitted it, and perhaps use a crush washer on the top (I have a spare CCT gasket kicking about too ) to be extra careful, I could have a rattle free life for sometime, for next to fuck all.

Thoughts? I do only have a rudimentary grasp of mechanics I'll be honest, but to me this seems very painfully obvious (especially given how shite Honda CCT's seem to be).
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[Visitor Q]

By the way, this is a manual jobby (as said, sold for £50 )

https://www.bigccracing.com/shopfiles/product/image259_big.jpg
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...

[chris-red]

I'd worry about the cam chain ripping the the top of the bolt off, you have to make sure it was strong enough for the job. Providing it doesn't leak oil I can't see why it wouldn't be fine.
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[Pete.]

The chain doesn't ride over the bolt - the bolt just presses on the back of the tensioner blade.
Making one of those would be very easy if you had the equipment. All they do is take a normal bolt and turn the head down on it, make a plate, tap it for the bolt, screw it through the plate and fit a nut which is pinned to the end of the bolt. Oil is kept in by a small o-ring on the bolt thread which seals on a countersink in the plate. The big trick is knowing how much tension to put on them.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Visitor Q]

[Kickstart]

Hi

Your idea does sound feasable, although would partly depend on the metal of the adjuster being half decent to hold the bolt.

However are you sure the problem isn't just a worn cam chain. Not really much to wear out in a cam chain tensioner.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Visitor Q]

[Kickstart]

Hi

Honda cam chains used to be dire, but thought the CBR600 one was no worse than any other bike cam chain.

The cam chains are basically ratchets, allowing them to push out to take up slack but not move back and release the cam chain. Not really much to wear.

However a knackered cam chain isn't going to be solved by a new tensioner.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[mad4it028]

when i had my cbr 600 i was always changing them so changed the chain same problem!!
how i solved this was to take off the cct remove the circlip which lets you into the spring i then fitted a stronger spring which fitted inside the standard spring refitted the circlip refitted the cct did 20000 miles on it before i sold it and was still fine

think the spring i use was an exhaust spring off the front pipe of a pug 106 i may be wrong on that tho
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[Pete.]

[Visitor Q]

[virus]

Getting it machined = yes, making one out of an old one = no.

Ill explain, the automatic CCT on my gpz failed when I was rebuilding the engine, now for those that arent familiar with kwak CCTs, its got a oil seal bolt on the end, then inside is a slot you put a screwdriver in to do your adjusting etc, me being a cheapskate decided to put a much longer bolt in place of the oil seal bolt, with a washer and 2 locknuts on.

All worked well until I fired it up the other day and the bolt dropped out of the CCT, turns out 4mm or so of thread on that oil seal bolt isnt up for the job.


so, your 2 best options are, get on ebay and find another cheap, or get it machined properly into a manual one.

Cheers
John
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owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance.

[Pete.]

[D O G]

I changed the CCT on my SRAD to a manual one (which I bought, not built!), pain in the arse IMO.

You do have to retension it regularly - like each oil change, somewhat annoying. I would try the spring mod as previously suggested (perhaps by a CCT from the breakers to modify), or wait a month and get a new genuine one.

[Visitor Q]

[D O G]

[Visitor Q]

[iooi]