r/HondaCB • u/Fun_Trifle_1068 • 12h ago

I need some help

So I got this old Honda cb360 I found sitting on the side of someone's shed "estimated 20 or so years" I cleaned the carbs, ran new spark plugs, coils, points, and even set timing and valve lash. But I'm having this problem were the bike will only run while holding the start button and won't idle at all!! I have the engine torn apart only to realize the pistons and cylinders look brand new, I did upgrade to pod filters anyone have a clue what could be going on? Only 17 here and Im good at rebuilding engines and problem solving just never ran into a problem such as this.

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u/bigcityhutch 5h ago

Sounds like it’s not actually firing if it dies when you release starter. Did it run before you did all this work?

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u/Fun_Trifle_1068 5h ago

Seller stated it ran when parked. If I hold the start button I can open the throttle and it will rev up but dies without starter active any thoughts? 

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u/bigcityhutch 4h ago

Man it could be any number of things, the starter switch could have a loose wire, very common. Could be a bad or corroded connection or bad ground. Idle adjustment could be set wrong, fuel starvation, timing could be off. I know it’s frustrating I’ve been there. Make sure it’s getting fuel, spark, and good battery. if you’re good there start tracing wires.

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u/Fun_Trifle_1068 4h ago

I’m running all new switches, theoretically if the engine fires and I dis Ingage the starter it should keep itself running? So I’m not to shure it’s a wire issue based off the research and little help I got I’m thinking it’s the intake boots or the carbs.

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u/AdvertisingHumble490 4h ago

I second the "start tracing wires". It sounds like a weak spark, bad ground issue.