cb125 probs

Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

hi all, just got meself a '84 honda 125 twin (superdream) for use after my cbt, it may be old but is in quite good condition.

however there is a problem with the running side, bike starts fine, if a bit noisy, cam chain i expext, the idle is random revs/drops, as soon as the throttle is touched it bogs down and dies.

any ideas what this could be? as im new to bikes.

thank you

garry

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

Mine did this till I balanced the carbs then all was fine.

2 new air filters and a carb balance should do it.
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Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

thank you ill give that a try. although it may be worth metioning that the air filters are the k&n type, i didnt fir them they were already on it.

also is there any way of adjusting the cam chain.

garry

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

They don't like pod filters. Does it still have the original airbox?
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Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

yeah, the guy gave me it with the bike, i tried it but it seemed to run worse?

howerver i have a new problem Sad

i took the rocker cover off to see the condition of the cam chain etc, and went to make a cuppa, i came back just in time to witness my 3 year old dropping a washer into the engine. cant see it, think it has gone all the way down Crying or Very sad

needless to say it must be retrieved, any suggestions please Embarassed

Garry

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

Thank you, fpr the relpy, ill give it a go tomorrow, if the washer dosn't fall out, guess ill have to stip the engine then Crying or Very sad

Garry

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

I've heard of people greasing the flywheel in the hope that it'll pick the offending article up from the bottom of the crank when turned by hand. More often on 2-strokes to get dropped small end needle rollers. Works sometimes.

You can also sometimes get them by pushing a magnet on a stick in through the hole where the oilpump pickup goes (if it'll fit, can't remember the exact setup on a CB125). Bits tend to gravitate to the lowest point which is where the pickup usually is.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

thanks again, ill guees ill just have to see what i can do.

one more thing bike is a 82 cb125 twin, im looking for a cam chain but i am unsure what one i need, had a look on wemoto, but the pics of the chains dont look any thing like mine.

anywhere else i could try?

thanks again.

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Is it a superdream (electric start) or the older CB125T (kick start)?

All the best

Keith
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Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

its a superdream, 125 twin,elec start, there are listings on wemoto for TDC/TDE/TDJ, etc i dont know which one ive got, new to bikes.

sorry for askin silly questions.

Garry

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

At that age it will be a TDC. It is very early for a Superdream though.

All the best

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

Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

Thanks for that keith Very Happy

progress is being made, thought i'd have a look at the carbs while im waiting for some bits to arrive, the piston in the right hand carb is sitting a lot higher than the left at rest, methinks this is while it was behaving badly.

Garry

deliriousthun... · Spanner Monkey Joined: 29 Mar 2008 Karma :

Might be naïve, but I think worth suggesting, as we all miss the obvious from time to time.. Maybe you've accidentally left the choke on?

EDIT: oops, didn't read your last post properly, sorry Razz

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Tom

Garth84x · Two Stroke Sniffer Joined: 13 Sep 2009 Karma :

Ive made a start, took the engine apart, and im guessing from the look of things that the bottom half of the engine has to be split to change the cam chain. (and to retrive the washer, and whatever else i find)

straight forward i thought, however i cant remove the um..flywheel? magnet thingy lol, sorry any one know if has a left or right handed thread and how i can lock the engine to remove the nut

thank you.

Garry

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :