Does not go faster than 27mph after 4 tanks??

Any suggestions?? Wrapped my exaust w/ performance wrap, gotta performance air filter and installed a new spark plug "Champion" w/ out setting a gap.. Thought it would be fully broken in and I would be able to cruise @ 'round 30mph at helf throttle, any suggestions??

The top speed is going to depend on what sprocket you are running. Are you running the standard 44 tooth that comes with most kits?

John

That's about in the middle of the "top speed" of these things...25-35 mph.

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If it ain't broke, and you mess with it long enough, it will be.

my top speed i had it up to is 32mph,but even at 28mph it feels like my butt is strapped to a rocket on a broomstick.i wouldnt sugest this but you could take off your air filter and unscrew and take off the bottom of your muffler,you will get faster acceleration and top speed for a while but the effects on the engine are not know by me.you could up the gas/oil mix to 25:1 or 30:1 but the engine could seige if to low of oil.you could get cruiser or slick tires you will gain more speed.or you could get a smaller rear sprocket.
anyway i think 27mph is fast enough on a bicycle not built to go that fast.

the cruising speed for these things is 20-25mph
with ocasional speed increases to 30-32 for short distances

Get a smaller sprocket for the rear wheel, and then like someone else on the forum likes to say"ride it like you stole it"

Try adding octane booster 1-2 ounces per gallon. It take a whole bottle for a car tank of gas.... It might increase the combustion!

these engines like regular gas and plain ol' 2-stroke oil.
not nitros, not jetfuel, or boostbottles or octane boosters but you can try it.

and set your gap on your plug while youre at it.

Octane booster is not going to do anything with a low compression engine.

Proper set up will.
But, the bottom line is that these engines are not race engines, and 27 mph is not to shabby.

__________________
If it ain't broke, and you mess with it long enough, it will be.

As Godfather says, 27mph is not bad at all. On warm days I have trouble reaching 25mph. In the cool winter days I can hit 31 mph. My motor is very sensitive to temperature.

What wheel size, how many teeth on the rear sprocket, how many rpm's is the engine running?

My bike has a 26x1.75 tire, 44 tooth rear, and runs about 23mph at 5500rpm. Sure, it can rev a bit higher but the vibes start to get excessive. The speed is as read by a Schwinn computer and the revs are as read by an ENM PT16e2 rev & hour meter. I know it could go faster with fewer teeth on the rear sprocket, but we have big hills here and I don't want to give up the hill climbing ability. I'm not sold on any of the existing gear change products but eventually someone will crack that problem with a compact, reliable and fairly priced product. That's the holy grail.