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Author Topic: My CB100 Cafe Racer exhaust  (Read 2019 times)

Offline coyote13

  • Posts: 1201
Re: My CB100 Cafe Racer exhaust
« Reply #10 on: May 11, 2018, 12:30:44 »
I believe that's just the nature of the carburetor, crack the throttle too fast and you basically flood it.  Not uncommon on old motos.
Half the fun's in the get there...

Offline waldo101

  • Posts: 24
Re: My CB100 Cafe Racer exhaust
« Reply #11 on: May 11, 2018, 18:57:44 »
its just gotten worse, it starts after a few kicks but if I twist the throttle the smallest bit it tries to bog out and starts popping out the carb, does anyone know what would cause this? I've cleaned the carb 3 times and I have made sure every hole is cleared. could this be an issue with the timing or valves?

Offline datadavid

  • Posts: 1450
Re: My CB100 Cafe Racer exhaust
« Reply #12 on: May 15, 2018, 13:09:42 »
What do you know about jetting?

Offline datadavid

  • Posts: 1450
Re: My CB100 Cafe Racer exhaust
« Reply #13 on: May 15, 2018, 13:10:52 »
I believe that's just the nature of the carburetor, crack the throttle too fast and you basically flood it.  Not uncommon on old motos.
No. It does not flood, its fuel starved when you open fully at low revs. Flooded with air more like.

Offline coyote13

  • Posts: 1201
Re: My CB100 Cafe Racer exhaust
« Reply #14 on: May 15, 2018, 13:23:31 »
I guess that's what I meant, just poorly worded.  Thanks for clarifying dd
Half the fun's in the get there...

Offline waldo101

  • Posts: 24
Re: My CB100 Cafe Racer exhaust
« Reply #15 on: May 15, 2018, 20:04:54 »
i know nothing about jetting, the carby is stock, I ended up adjusting the timing and its worked good since then.

Offline waldo101

  • Posts: 24
Re: My CB100 Cafe Racer exhaust
« Reply #16 on: May 15, 2018, 22:15:26 »
If i pull throttle to fast it will try and bog down but i do it reasonable speed its okay and revs up good. The spark plug is black and i don't need choke to start the bike. will being too rich in mixture bog the bike? Im not sure what to do.

Offline datadavid

  • Posts: 1450
Re: My CB100 Cafe Racer exhaust
« Reply #17 on: May 16, 2018, 05:02:20 »
Mechanical carbs do that, its normal.
Black plug and starting w/o choke indicates rich condition. You should do some light reading on carburator tuning before you do anything else!

Offline irk miller

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Re: My CB100 Cafe Racer exhaust
« Reply #18 on: May 16, 2018, 08:55:00 »
What datadavid said plus this is good guide to give you an idea what is where when it comes to tune. 


Offline waldo101

  • Posts: 24
Re: My CB100 Cafe Racer exhaust
« Reply #19 on: May 16, 2018, 09:41:08 »
thank you, i will get onto that tomorrow. fixed one thing then another problem pops up, when the bike is idling every now and then it sounds like the cam chain is rattling around, i have got the tensioner on the max, could the tensioner be broken? i accidentally took the tensioner bolt out all the way last month on the outside of the engine and Im not sure if the bolt was supposed to clip into something inside the engine?