Large Sprocket | Torque Exhaust - Need Dead Stop Power

My pipe would crack and start to sound great... I hollowed out a banana pipe at first then I did a kx85 pipe... Then a muffler from the original pipe... I cut off the muffler and at about 11-12 inches the straight pipe would come into it... The straight pipe was only good flat out... It made it sound badass and flames from it at night were my only light... The zoomie exaust is what will make the most power but I like the dirt bike sounds the mz65 and kx pipes make... Your never going to get around the geometry of the bicycle and capibility of the engine... It's a 100+ year old technology at best...
These engines are only 50 y/o tech that's when schnerel porting and piston tops without a big ramp to aid in scavenging became common practice and they went away from cast iron cylinder bodies and sleeves, now it seems like we've gone full circle and are coming back around again.
 
These engines are only 50 y/o tech that's when schnerel porting and piston tops without a big ramp to aid in scavenging became common practice and they went away from cast iron cylinder bodies and sleeves, now it seems like we've gone full circle and are coming back around again.
Right the safety bicycle is 100+.. now we got this
 

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Back to sprockets... I got some 46tooth coaster cut sprockets from MB rebel CDH 3/8" adapters for 1 1/2" coaster brake... I have some 40 and 44 one's and figure on having a few to try...
 

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The right pipe will help with the low end, if the pipe has a pretty long header then you will get more low end but it will be nothing as good as the higher tooth sprocket will give you for hill climbing. That is to say, you will get much more out of a 55+ tooth sprocket than the pipe.
Thanks just the answer I'm looking for. Going to try a 60 tooth on it today or tomorrow!
 
Well I have to say... This forum is DRAMATIC! lol....

I am not getting the 'bike flipping" torque I thought I would from going to the 60 tooth sprocket and torque exhaust, but the thing is a lot more fun!

1. It has crazy acceleration now. Which is much more useful than top speed for me - and much more conducive to off-roading. You can whip around a corner or tear off super fast.

2. The torque actually allows me to idle without any throttle and putter forward. Super awesome for pacing someone on foot or on a regular bike. Previously, I couldn't really ride alongside my son on his bicycle (or someone moving at a slower pace) because if I slowed down too much it would die from lack of momentum. I actually can go slower now on it (who would of thought this feature is so awesome!!) - kinda crawling forward via power from the motor. I really wanted that.

3. We're nearly at eliminating any pedaling. This is super cool. I can actually control the bike with the throttle and clutch without fear of it bogging down and dying.

4. I did have it pull me from a dead stop with feathering the clutch and NO PEDALING. Not optimal, but IDGAF if I have to replace some cheap pads. I really wanted that!

5. It still won't pull me up the easiest of the 3 hills I set out to conquer. No exhaust leak, no intake leak, no bad compression, none of the things wrong. We're getting to the point I feel like the motor just isn't strong enough to to do what I am trying to do. Oh well!
 
Well I have to say... This forum is DRAMATIC! lol....

I put the 60th tooth sprocket on and based off of what the replies said I thought this thing was going to flip me over.

Well....

I have to say it is slightly noticeable going with the 60 tooth vs the 44 tooth. I wish they made a 120 tooth now after trying the 60 tooth.

Plus, I did the upgraded exhaust.

So with the 60th tooth plus the torque exhaust it still won't climb up the easy hill out of the three I'm trying to conquer. I'm pretty much past this little 80cc motor now. It just can't put out what I need it to.

Watching my son blow up a hill on his 196cc go cart and my bike bog down and die just makes me feel like abandoning the 80cc bike stuff altogether. These 80cc motorized bikes just aren't capable of handling the basic roads where I live. I don't believe they make anything that I can do to this bike to make it climb these hills.

:cry:
Something doesn't sound right. How big of an incline are these hills? How fast will it go while going up the hills? Maybe you have an air leak or something.
 
Well, I am going to edit my last post. I feel I was little dire from the disappointment of not climbing the hill still.
 
Well, I am going to edit my last post. I feel I was little dire from the disappointment of not climbing the hill still.
I hear ya, sometimes frustration is part of the deal with these bikes, usually, when you get all the kinks worked out they become more reliable. How fast will it go up your hill with the 60 T sprocket at wide open throttle?
 
I hear ya, sometimes frustration is part of the deal with these bikes, usually, when you get all the kinks worked out they become more reliable. How fast will it go up your hill with the 60 T sprocket at wide open throttle?
It still won't climb the easiest of the 3 hills I need it to climb. So I would say that is 0 mph lol.

Its funny - as soon I get this thing reliable I start messing with it and make it less reliable.

With the exhaust and the 60 tooth I feel like I am finally at a point to let it be as is for a couple month. I enjoy it much more now than the previous load out. It is much closer to what I want from it than it has ever been.
 
Something doesn't sound right. How big of an incline are these hills? How fast will it go while going up the hills? Maybe you have an air leak or something.
These are seriously questionable hills. Inside my neighborhood with paved roads.

They are so steep bike brakes aren't strong enough to stop you from accelerating downhill when you are on them. You have to slam the brakes full clench and let your foot slide on the ground to keep from gaining speed if you want to go down them via a bicycle.
 
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