Re: Kawasaki kb100 RTZ rebuild

Hello guys its been a while since ive logged on to xbhp... i have just got a kb100 1990 model in non working condition and opened her up today
because the kick had some sort of a problem..turned out it was the kick ratchet..am thinking now since she is opened up i might as well restore her


i need to install a new parts
as of now i need..


1.clutch housing.
2.clutch plates pressure plates.
3.piston/rings with boring.
4.crank/crank bearings.


A.does anyone know the costs? specially of the clutch housing and plates..and crank and crank bearings?


B.i also need to know about a thin moon shaped rotation plate connected to the crank shaft it seems to be some sort of a compression holder..


C.ive never ridden a kb before.. how is it to ride? power wise? i wish to play around with the jetting and get an expansion chamber..how does the engne respond to a shaven


head will the bump in compression ratio give a significant gain in power??




i know its a ton of things in one post..any information would be welcome, the place where i live i have not seen a kb here in month's..am dying to hear how my bike sounds

Re: Kawasaki kb100 RTZ rebuild

Replies in bold.

Re: Kawasaki kb100 RTZ rebuild

thank you some much that was useful information

i am not able to start a new thread ..xbhp has changed in these few years ive been away..
well i got the connecting and crank
new engine bearing's
my block was kaput decided to sleeve it for now..maybe later ill get a new block
how do kb's run with a sleeve? anyone with experience?

Re: Kawasaki kb100 RTZ rebuild

you cant resleeve a kbs block it is a complete cast iron unit

Re: Kawasaki kb100 RTZ rebuild

Its already been done..ive also lightly polished the inlet's and machined the head to up the compresion..am keeping my fingers crossed..

Re: Kawasaki kb100 RTZ rebuild

@srinikasyap : can you please confirm whether the micarb you bought for the kb had the hole (circled in red) on the side of the carb

Re: Kawasaki kb100 RTZ rebuild

Great looking bike. I have the same wine red colour 1990 RTZ delta. Done some thing like 45000 odd kms. Now languishing in Varanasi. Tried a rebuild but the carb issue got me stumped. Got a new one from Delhi last year but it just does'nt seem to work. The mechanic who has been working on it is the guy who was there with the Bajaj service centre in 1990 when i purchased the bike who subsequently set up his own shop. But with barely any RTZ in sight in Delhi or Varanasi spares are non existent. Still looking for the tacho cable. Also have been searching for the original Stanley 12V 35/35w bulb since the last decade or so. Can anyone help me out?

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[MENTION=26930]kb100[/MENTION] : Have'nt been able to see any snaps of your KB in this thread. have a posted some after the paint job?

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Great bike. The Delta super tuned engine graphic is a throwback to the 80's and 90's. Could'n you get the rectangular headlamp or have you done the swipe deliberately because of performance issues. As far as i can remember the KB headlight were market leading at its time and in one of the reviews in 1986 or 1987 in Indian Auto Journal the rider had posted that you can see a truck before it can see you. It out performs anything on two wheels and puts a lot of 4 wheelers to shame.

Re: Kawasaki kb100 RTZ Delta super-tuned rebuild

Hey guys,I'm new to xbhp. I read this whole thread. Good to see these many KB lovers.I'm too one of it.I have a 1991 wine red KBajaj KB 100 RTZ Delta Super Tuned bike.I need some help restoring it.
The story of my bike:

My dad completed his college and got a job.The company owner wanted my dad to buy himself a bike as he in the marketing section.The company owner had a KB 100(He had a cheetah engine.....not mine which is a delta).He suggested my dad to buy a KB.But,my dad wanted to buy an RX. My dad approached his dad. My grandpa suggested him to buy a CD 100 as it give a wonderful mileage("Fill it,Shut it,Forget it" as it came in the ad).My dad refused as the CD goes as fast as my grandma....LOL...At last they came to a conclusion to buy a KB as it gave more power at good mileage.But my dad's vision changed after buying this bike. After his first ride in this bike, he fell in love with it.The year was 1991 when all this happened.He then got married and his ride trips to Ooty with my mom at high speed in the hills even scared my mom.But, even he rides so fast, he is confident driver. You can trust him when you are his pillion.He would nearly sleep on the ground when he is turning in the hair pin bends.In 1997, my brother was born and became the rider of KB at that small age by sitting on the fuel tank and my dad on the riding seat.

Then came me in 2000.I rode my first vehicle Kinetic Honda when i was in 3rd grade with my dad as pillion.I rode it alone in 5th grade.(I still remember me falling down in the first ride when i went alone).My dad taught me drive a car when i was in 7th grade.I practised in my dad's Ford Fiesta.I rode my first bike during 7th grade summer holidays.It was a TVS Apache RTR 180.This was in 2012. But, we gave the KB to my dad's uncle in 2009,I believe(Maybe 2010 or 2008).

Then years went by and completed my 10th public exam with 493/500 and as a reward, my dad bought me a second hand Yamaha FZ-16 V-fi matte black.I went for drive-bys, speed-tests etc and i rusted the contraption like anything.Now for the past the past three months, I was in talks with my dad about the KB we owned and promised he'll be getting me the bike in a week or a couple...I can't forget that bike.It has been in use from 1991 to 2007 by my dad and after that for around 2 years it stood idle. Then my dad's uncle took it, did some work it ran for around 4-5 years.Then it stood idle for around a year under the sun after the clutch phase in it was blown and he didn't get any spare.The paint has ripped off.I don't yet know the condition of the bike.I think it has a lot of work to do and i know i must get my hands dirty. I need your support in rebuilding it.I'm lucky that i'm in coimbatore and can get spares from aditya automobiles.

Thanks in advance.....

Will be posting the pics of my bike as soon as i get it.

Re: Kawasaki kb100 RTZ rebuild



These are the pics of my bike i took yesterday. Looks a lot rusted. I dont know that i'll give rebirth to it. But i'll try my best.

KB 125 vs RXG



What do you guys say about this?
KB 125 vs RXG
KB wins.

Re: KB 125 vs RXG

hello KB-100 ,

could you please help me,my KB-100 facing an issue.it feels like bike is asking for next gear even while travelling at 45 kmph.the bike revs maximum even at a 45 kmph is weired.am not sure if it has some thing to do with clutch.mechanic suggests to play with grear ratios to increase top end.but i sware bike is perfect nd having good response until 15 kmph

Re: KB 125 vs RXG

change your clutch plates and springs

Re: Kawasaki kb100 RTZ rebuild

Hello all.
I am a new member to the group.
I have been reading the thread .
Need a little help-
My KB 100 is 29 years old- 1988 model.
It is in more or less good condition. I would like to give it its glory back.
The first hurdle is , the tank is punctured at multiple locations. So how and where do i find a new or good one. Also if any other models have tanks that can fit the KB chassis without any retrofit. ..

Re: Kawasaki kb100 RTZ rebuild

you can try to get the holes filled by gas welding, or try sourcing one from the scrapyard , but do try asking old bajaj dealers in your town , you might get lucky

Re: Kawasaki kb100 RTZ rebuild

Thank you . I tried doing that... And fixed it for the time being.
I would like to have a more permanent solution. So anyone who can source a new tank .. please let me know.