gearing? 49cc two stroke kit

gotgas? · Apr 22, 2013

hi i'm looking for some info on a two stroke china 49cc motor kit LEB off ebay. The kit came with a 39 tooth sprocket and i have it mounted on a 10 speed road bike it had 27" tires i changed the to 24". I'M wondering if its geared to hi, it doesent's have any hill climbing power the top speed is about 26mph any help would be awsome. thanks gotgas?

crassius · Apr 22, 2013

hill climbing will depend on your weight also - that 26mph sounds like you haven't gotten the engine run in yet, so too soon to tell about the sprocket

gotgas? · Apr 22, 2013

its got about 600 miles /30 mile trips i weigh 150

MotorBicycleRacing · Apr 22, 2013

gotgas? said:
its got about 600 miles /30 mile trips i weigh 150

600 miles is well broken in.
With a 39 tooth sprocket on 24" wheels at 7000 rpm = 31 mph

cumminsbayou · Apr 22, 2013

I have a 39 tooth on mine it does fine with 26in tires and climbs hills fair i do have to peddle on some in grass, I haven't gotten mine to top speed but i have gotten it to 26 so something is up with yours. I am 140 pounds it does every thing i want really. What oil ratio are you running?

gotgas? · Apr 22, 2013

4oz to a gallon

gotgas? · Apr 22, 2013

the top speed is 26 going down hill

MotorBicycleRacing · Apr 22, 2013

gotgas? said:
the top speed is 26 going down hill

49 cc motors can be a little gutless.

do you have a pic of your bike?

gotgas? · Apr 22, 2013

just did a compression test cold 65psi what do they normily run

gotgas? · Apr 22, 2013

Here it is ain't she a beauty, rotfl

crassius · Apr 22, 2013

sounds like you might be a bit lean - get near a hill and lift the needle one notch & see if that gets you up the hill better, if so, try one more notch

if you improve on the hill, then try the flat again & see if you're faster

gotgas? · Apr 23, 2013

I have tried the needle in all the notches with out much luck it seems to run best in the middle.

crassius · Apr 23, 2013

seems like you're left with changing to a 44tooth to see if that helps - having both hill problems & flat problems might be just a weak motor tho, which could take a lot of looking into

cumminsbayou · Apr 23, 2013

crassius said:
seems like you're left with changing to a 44tooth to see if that helps - having both hill problems & flat problems might be just a weak motor tho, which could take a lot of looking into

i can tell you the 39 tooth sprocket isn't geared to high, my motor has lots of miles on it way more than his and it does hills and stuff great

gotgas? · Apr 23, 2013

thank for you help i'm thinking about a new bike and kit i would like a 66/80cc. what are you guys running thanks gotgas?

MotorBicycleRacing · Apr 23, 2013

cumminsbayou said:
i can tell you the 39 tooth sprocket isn't geared to high, my motor has lots of miles on it way more than his and it does hills and stuff great

Is it a 49 cc or a 66 cc?

crassius · Apr 23, 2013

I like a 66cc, but running with 24" wheels will often cause top speed problems - climbing hills should be really easy tho.

gotgas? · Apr 23, 2013

the setup i have now is a 49cc. what is your top speed on your 66cc

crassius · Apr 23, 2013

most of the 66cc motors will do about 30mph for 150lb rider with 44t & 26"

gotgas? · Apr 23, 2013

i put a longer spark plug in and it seems to run better i'm going to mill the head some and see if i can get better compression

gotgas? · Apr 24, 2013

i have compression!!! 90psi running great i cant wait to clock it ill let you know what the top speed

gearing? 49cc two stroke kit

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