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Author Topic: the new guy. CB100 first custom  (Read 6593 times)

Offline Roots265

  • Posts: 28
  • Mmmmm Vending Machine Hotdogs.
the new guy. CB100 first custom
« on: Apr 14, 2015, 01:37:49 »
hi all
just thought id say gday. (yep im Aussi)(wollongong in fact)
been riding bikes for a while now but am just about to start my first (hopfully first of many) custom build.

i got this little CB100 for free. its been sitting in my dads shed for around 20years.
it ran (with a stuck clutch) when put away but time has not been kind,
then engine is siezed, the tank is rusted out and a family of rats made home in the seat.
but im keen to nut and bolt it anyway.

plan is to oversize the 100 engine(125)  do some lite headwork and custom upswept exhaust.
stretch a new tank a couple of inchs, fab a custom rear cowl out of my rusted tank.
clip ons or drop bars to get low riding position, rear sets to suit tank and bars.

iv got a Harley sportser for bruising the freeway so the plan for the cb is to make it fun round town.
it needs to stop and handle.
looking to upgrade the front to bigger forks and hydraulic disk with decent shocks all round.

here are some pics as she stands.



If a Jobs worth doing.
Its worth doing Twice.

Offline Brodie

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  • Posts: 2408
  • Gold Coast, Queensland
Re: the new guy. CB100 first custom
« Reply #1 on: Apr 14, 2015, 01:46:16 »
Gday, looks like a good place to start mate. Just a little rusty and crusty.

Try spraying some WD-40 down the spark plug hole. The engine probably seized because one of the valves was slightly open. Just leave it over night and then gently try to turn the motor around. If it doesn't work spray a bit more and wait a little longer. You should be able to put it in top gear and gently bump it back and forward.

Have you considered swapping the engine out for a larger one? There are quite a few that should fit, even a couple of off the shelf Chinese motors.
« Last Edit: Apr 14, 2015, 01:47:57 by Brodie »
I'm not sure, but don't ask Brodie.

Way to many build and half done projects to list here.
Sr250, Gs750, Z50A, XV1100, A10, Z160A.

Offline grcamna5

  • Posts: 1060
Re: the new guy. CB100 first custom
« Reply #2 on: Apr 14, 2015, 01:47:46 »
Your CB100 is exactly like the one I bought a few years back while on a bicycle tour across the USA;I sold my bicycle in Nebraska and purchased the CB100 and rode'er back to the E. coast then later installed the CB125 engine & instruments along w/ front disc brake;it was a fun bike. I hope you enjoy your project.  8)
Do your Best,no one can take that from you.

Offline Roots265

  • Posts: 28
  • Mmmmm Vending Machine Hotdogs.
Re: the new guy. CB100 first custom
« Reply #3 on: Apr 14, 2015, 02:29:40 »
thanks guys.
i have dumped the oil/petrol from the case, filled the chamber and case with Diesel and sprayed the whole bike with wd40.
im heading away on holidays soon and will leave the stripdown till i return. 2 months or so.
it goes through all gears and spins in nuetral so im hopings its motly ok.

plan is to get it running with this engine/bigger slug while and see if it needs more balls.
if so ill build a 125/150 for it.(who am i kidding, ill probably do this anyway)

my biggest issue will be getting registered hear in NSW Australia as our laws are quite strict. especialy for what we call blue slips. (required for curently unrego'ed vehicles)
once registered you can get away with more.

to get it running i NEED a new tank.
dont spose anyone has a CB100 or 125 tank laying around they dont want.
ill pay good cash but everyone on ebay in Aus wants to make millions and postage from OS kills a bargan.
condition isnt a big deal as i will be cutting it up in the future anyway.
mines just got too many metal worm holes in it.

cheers
Roots265
i have the old papers, last regoed in 82. so i can prove its not an import.
« Last Edit: Apr 14, 2015, 02:31:28 by Roots265 »
If a Jobs worth doing.
Its worth doing Twice.

Offline Anmic

  • Posts: 54
Re: the new guy. CB100 first custom
« Reply #4 on: Apr 14, 2015, 03:26:15 »
Have you looked at the possibility of a 125cc tank fitting? I know parts for the CB125's are alot easier to get and cheaper here in Aus. Good luck with the build mate! Im building a little two stroke racer atm in Canberra.
"Yolo is for people to stupid to understand Carpe Diem" - Jack Black

RX100 Racer - http://www.dotheton.com/forum/index.php?topic=65469.0

Suzuki GSX 250 Cafe - http://www.dotheton.com/forum/index.php?topic=61634.0

Offline haircuttergirl

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  • Posts: 1810
Re: the new guy. CB100 first custom
« Reply #5 on: May 02, 2015, 08:33:01 »
Welcome to DTT :)

Offline WhyNot

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  • Posts: 1192
  • ~~~If it ain't raining, I'm riding~~{iii}?~~prost~
Re: the new guy. CB100 first custom
« Reply #6 on: May 02, 2015, 09:16:38 »
Welcome from Georgia.........I'm in process of redoing a CB100 at this time.

Haven't been able to do much, recovering from surgery at the moment.

Good luck with the build, I will be following and hopefully help and get help along the way.

Once again, welcome.
« Last Edit: May 02, 2015, 09:19:42 by budlite282 »
2006 Harley Davidson Heritage Softail
1975 Honda CB750K5 needs carb work
1974 Honda CB350F2 needs tins painted (being lazy)
1972 Honda CB175K2 roller no engine
1972 Honda CB/CL350 Engines need roller
1972 Honda SL350K2 Frame for above engine
1972 Honda CB100K2 needs kicker shaft
1990 Mitsubishi MM needs engine rebuild
1984 Dodge D50 Beater DD since 1997

Offline magma

  • Posts: 1
Re: the new guy. CB100 first custom
« Reply #7 on: May 02, 2015, 09:35:15 »
Biiiiig fan of this little bike. You can install a six speed gearbox too

Offline grcamna5

  • Posts: 1060
Re: the new guy. CB100 first custom
« Reply #8 on: May 02, 2015, 23:15:40 »
Biiiiig fan of this little bike. You can install a six speed gearbox too

Me too  ;D 8)
Do your Best,no one can take that from you.

Offline 45exmayor

  • Posts: 127
Re: the new guy. CB100 first custom
« Reply #9 on: Sep 08, 2015, 20:10:31 »
Just found your build.  Subscribed.  Recently got my 100 with a 76 125 back on the road.  Fun to build, even more fun to ride there are quite a few 100 builds to pull info from.
« Last Edit: Sep 08, 2015, 20:12:37 by 45exmayor »
http://www.dotheton.com/forum/index.php?topic=66379.
'71 CB100/125
'02 monster 620 (sold)
'66 Triumph T100SC(sold)