HONDA CB100 FrankenBike ( No Running Lights )

4812 Views 26 Replies 5 Participants Last post by Boostamante, Oct 3, 2017

Boostamante

Discussion Starter · Sep 11, 2017

So i bought this 1972 Honda CB100 a while back for a couple hundred bucks. It ran a bit rough and had no lights wired up. Since then i have ran new gas in it and have managed to get her running somewhat decent ( might need a carb clean and new gaskets ). I see no evidence of a stator and it seems to only been used as a dirt bike in its past life. I would love to run lights and have at least a working brake light but cant figure out what the best way to go about it. Cant really tell if the engine is the original CB from another bike or a CL. ( the original exhaust ran High vs the low CB style ).

I have 2 options in my head, one is run a LED head light and wire up a small 12v battery or figure out they correct stator that will work with mentioned engine ( The isnt option isnt ideal but it works ). Currently the bike runs without a battery and has one wire coming out the left side that goes to a kill switch.

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Tanshanomi

· #5 · Sep 11, 2017

Boostamante said:
Cant really tell if the engine is the original CB from another bike or a CL. ( the original exhaust ran High vs the low CB style ).

The engine is a '78-later XR100 or XL100, which is not closely related to either the CB100 or CL100 engines made in 1972. The engine is actually a bored out version of what was originally sold as the XL75.

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Boostamante said:
Currently the bike runs without a battery and has one wire coming out the left side that goes to a kill switch.

The lack of lights and battery suggest it's the XR version. 80cc and 100cc versions were made for many years and lasted until 2013 as the CRF100.

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Tanshanomi

· #7 · Sep 12, 2017

Boostamante said:
This explains why the CB100 Exhaust didnt quite bolt up. HA! Hence the funky mod exhaust i did. If its a XR100 engine, how can i tell? engine is stamped with HE01 and cant seem to come up with anything using google

I believe XR80s and XR100s were HE0's

1983 starts with HE0#E-52~
1984 starts with HE0#E-53~
1985 starts with HE0#E-54~
etc...

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Tanshanomi

· #9 · Sep 12, 2017

XB33BSA said:
i already told you, the engine capacity, it is stamped into the fucking cylinder fucking barrel
it is actually fucking cast right in to the fucking aluminum
if you cant even follow simple things like where to see the capacity of the engine,how the fucking hell will you learn to fix your motorcycle over the interrnet ? thats the point nobody does and that is another reason not to own a fixer bike because you know nothing
read books if you want to repair a motorcycle
trying to get that machine worthy for street riding is pure insanity ,why not just flush your money, all of it ,down the toilet ?
ride it like it is until it breaks and then give it to some young 'un

I think he was saying how could he tell if it was a CB100 or XR100 engine, which would both say "99cc" on the barrel.

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Tanshanomi

· #13 · Sep 13, 2017 (Edited)

Boostamante said:
Seems I have the 80cc engine. At least i know that for sure now. Wanted to make sure so i could order a carb rebuild kit as it idles a little rough and am afarid to crack her open and find out i need to replace gaskets. Would the XR100 /CB100 carbs / kits be the same?

NOPE. Let's start with this: what's the full engine number?

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Tanshanomi

· #18 · Sep 18, 2017

Boostamante said:
he01e-5104395

That's a 1980 XR80.

All the correct parts for this engine can be found here:
1980 XR80 A Honda Motorcycle Parts

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Tanshanomi

· #20 · Sep 20, 2017

Thought it would be relevant to include this chart here, considering all we've been discussing re: the little XL and XR models.

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Tanshanomi

· #21 · Sep 20, 2017

Boostamante said:
That's both good to know and a bummer at the same time. Lol, I'll get her running smooth, ride her and possibly hack job some lights for her so I can at least be visible in the hood. Thanks for your help guys!

The quick-and-dirty option is to run total-loss lighting off a 14.4V rechargeable battery. You can find a 3AH cordless drill pack and a charger for around $50-60. I'm guessing that would run a 25W low beam plus an LED stop/tail light for about 90 minutes per charge. I'd just be sure to get a Ni-MH battery so you can reliably recharge it from a totally discharged state.

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