What should a new engine sound like?

Oldcrow

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Jan 3, 2021
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I have never heard a motorized bike engine (tiny Chinese 2 stroke) so not sure what it should sound like. I have had many motorcycles including some single cylinder 2 strokes. The top end on this seems knochy to me, maybe that's normal for these. There's a low whiring sound when the clutch is engaged and I'm moving that I couldn't capture. Does anything sound obviously bad or out of ordinary? The engine is a Zeda 100 Firestorm, only has about 5 miles on it. I know I need to tweak the carb adjustments and check for any vacuum leaks.

 
M

Member 30571

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Sounds good to me. (y)
Did you put any grease on this little gear ?.
pVCV9o9_RyW9ZYbLwj77Tw.png
 

DAMIEN1307

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Does anything sound obviously bad or out of ordinary?
That sounds really quite decent so far. Idle sounds really solid.
Did you put any grease on this little gear ?.
Your going to want to put just a dab of either white lithium grease or red and tacky grease...just a dab because you dont want grease to work its way to the clutch pads...lol...DAMIEN
 

CrazyDan

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Jul 9, 2016
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There's a guy on youtube going by the name LA Hover that's been doing mild mods to the yd-100, might be similar issues to his. He's trying to fix the 4 stroking and hasn't tackled jets yet. He retarded the timing a little and said it helped a little. Here's his last video:
 

Oldcrow

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Jan 3, 2021
Messages
26
Sounds good to me. (y)
Did you put any grease on this little gear ?.
pVCV9o9_RyW9ZYbLwj77Tw.png
I did not but will do, the engine sounds rough to me, not rough like a multi cylinder miss fireing but a rattling metal on metal, it's sound like a 4 cylinder with a very stretched out timing chain slapping around , like shaking a soup can half full of steel marbles or an antique prototype hoarseless carriage. Maybe it normal for these and I'm just not use to it? I'm running 20 to 1 mix in the first tank. Very little visible exhaust smoke, also takes a long time to wind down when I release the throttle. So I'm thinking maybe a little lean, possible intake leak. Acceleration isn't smooth at all kind surges on and off, gets a little better after it's hot. I wish I had another to compare it to. Thanks
 
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