Re: My KB125 Rebuild


Gurus.....

Progress is slow, unable to get time between work & my 1 yr kid.

Anyhow, over past week, cleaned the carb and started the bike.
Was expecting to see an improvement in the engine firing/running.

However, it runs only on choke and dies when choke is closed or on throttle.

What have I done:
- checked the float height per manual (24 mm from case edge to float top, keeping carb inverted)
- cleaned whole carb in petrol
- Air screw setting - 2 turns out from closed (tried opening 2 more turns out)
- Throttle adjusting screw setting - several settings from low to high. (at high setting it runs at scarily high rpms)

Don't know what next, please advise.

Regards

Re: My KB125 Rebuild

Your Idle circuit is blocked....First remove the Idle jet and blow air through it. Remove the air screw and blow air through it, while blocking the Right side air hole with finger....next blow air through the idle jet seat hole....this should clear the muck......
The Throttle needle is set at the middle position....
The air screw setting is 1.5~2 turns from fully closed position...1 turn = 360 degree turn....
First try with 1 turn and then adjust for 1.5 and if it sounds rich, turn to 2 turns....
I am Presuming you have not touched the Rotary Disc Valve...

Re: My KB125 Rebuild

psr sir,

Thank you for helping.
Yestarday post work I removed the carb and cleaned the hell out of it.
And today post work, I fixed it and started the engine.

Its still refusing to idle. As soon as I let go of the choke, engine dies.

I have not touched the rotary disc.

What and where should I look/do next?

Regards

Re: My KB125 Rebuild

Quick update....

RTZ idling beautifully now.....1500 rpm.
I had removed the resonator while removing the tank and forgot to put it back.
Once fitted.....no air leaks.....idle on.

Thanks again.
Will start a new thread and stop free riding on this one.

Regards.

Re: My KB125 Rebuild

Really wonderfull thread throughout....!!!
one can learn alot of things for years by reffering this thread.

I can see not only the real craftsman spirit but brotherhood and dedications of peoples...!!!

thanx a lot for a wonderfull and really inspirational thread ...hope i will start a whole new thread on DIY basis someday if my work allowed me to do so

Re: My KB125 Rebuild

Dear Friends,

This thread is on;y 25 pages but for Raj its 4 years of hard work. I really salute the comradre in this group, esp psr anna and kb100 kudos to you guys. I have bought a KB125 and its time to DIY!

Re: My KB125 Rebuild

how much did you pay for this,

Re: My KB125 Rebuild

Here\'s a bike which I got as a gift from a friend about 9 years ago. I rode it for about a year and then destiny took me away from Ahmedabad. I am now seriously thinking of rebuilding this bike here in Bangalore. Do you think it\'s a good idea? Can anyone help me, in Bangalore, with a good mechanic and spare part dealer?

Re: My KB125 Rebuild

i found a 98 model KAWASAKI KB125 at scrap condition on a trip to tamilnadu.. i bought it, brought it home ( kottayam kerala). . restored it to its original pride.. this thread right here served as a bible through the restoration process.. thanking you all friends who are here. you guys are one in a million.

Re: My KB125 Rebuild

And I see a well maintained Bajaj BRAVO there, Is it still running on stock paint?
I remember, Bravo's had the best paint quality those days.

Re: My KB125 Rebuild

yes brorher.the bravo is of my friend. its company paint , single owned nd just 17k kms till date.

Re: My KB125 Rebuild

Looks pretty rough... though in Bangalore I suspect there are good resources, and the bike could come out looking like the one (from KL) in the posts below yours. Moreover, on the bright side, it is conceivable that the paint (?) spatter would've actually served to preserve the chrome...

My 125 was in scrap condition when I bought it, worse than yours, engine apart in a box, I guess about eight years ago now. At one point I had it fixed up reasonably well for the 15-year re-registration inspection. Since then, having been both daily beater and long-range Himalayan tourer, it's degraded and once again looks pretty much like a scrap item - but it runs well, still has valid RC, and brings such a smile to my face when I twist the handgrip. Will likely start a thread soon myself, as I'm planning to do a little rebuilding for the next inspection (coming year). It's going to be a cafe-racer-style build, I guess, already moved in that direction. Older son's just started school, and (crazy as it may seem) I think I'm going to fix this up nice and try to convince my wife to take him to school on it (the seat on my Impulse is too high for her, and not much point in buying a new scooter when I've got a perfectly good 19-year-old bike sitting there...).

Though relatively simple, these are slightly quirky bikes mechanically, and I'm not sure I'd advise a complete DIY-type thing if you completely lack experience (I'm an engineer who's been a DIY'er for decades and I still had a lot to learn with these). Mechanics who really know these bikes are going to be fewer and fewer now, as well. If you do get going on it, please keep the forum informed as to your progress, and if not, do PM me before you scrap it... I'd probably be keen on buying a few choice engine parts, or maybe the entire engine.

Regards,
-Eric

Re: My KB125 Rebuild

Sir could you please give me the link of service manual of kb125?

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Really awsome sir nice restoration.sir where did you get the spare parts of kb 125?