How is this 48cc engine?

[snppla]

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150211322616&ssPageName=ADME:X:AAQ:US:1123

I'm planning on converting my 26" mountain bike to a motorized bike. I just need to commute a total of 3-6 miles a day. How loud are these engines?

 

[fetor56]

The engines arn't very loud from standard....u can increase their performance by drilling out the baffle and that only makes them slightly louder,not enough to bother ppl.
http://thatsdax.com/BICYCLE_ENGINE_KIT_TIPS.html

BTW...u can quieten it down by putting small rubber blocks between the engine cooling fins(same as motorbikes)...it gets rid of much of that 2-stroke zing zing noise.

 

[iron_monkey]

Quiet at idle.

When under load they are as loud as your weedwacker engine but the pitch is much lower, like a motorbike engine. So it would be considerably less annoying.

They will be very loud/vibrate alot if you like going fast so a smaller sprocket may be necessary for aceptable noise and more importantly; not break the engine.

Sometimes metal clanging sound can be heard, due to a loose clutch plate(in my case). Or worse, a worn bushing.