Quick guide to high speed 66cc

[Jayraye39]

So im posting this to hopefully save the newbies some time. Ive noticed many of the rookies ask the same questions about making their motors fast. Hopfully this guide will help many achieve top performance from their stock 66cc

This quick guide with pictures will show you how to make your stock or new 66cc 40mm stroke a powerhouse. These mods and dimentions are all based off of my personal motor. This motor is between 4.5 to 5.5 horsepower and is capable of top speeds from 45-50mph. By doing these mods with these exact dimentions you can expect to see speed similar or identical to mine. Only thing i didnt include was my timing retard by half a keyway and my CDI. which is called a Catnip CDI

 

[Jayraye39]

 

[GW's Motorized]

Do you think you could include links to the threads where you did this modifications? I think that would help with some of the "how do I" questions.

 

[Jayraye39]

POWER PIPE. Hand built and tuned from scrap

So on a quest to build a tuned pipe or just a better pipe. I have taken 3 different expansion chambers and hacked them up. Im going to use the part that best fits my calculations off each pipe. combine them to make an overall better expansion pipe.. However when i cut open the nasty jack I was...

motoredbikes.com

Stock clutch hack (never slip again)

Hey guys hear to post a very cheap and reliable clutch hack without screwing with springs or buying an aftermarket plate. If your like me and have moded your motor and tuned it perfectly then chances are your stock clutch is giving in and slipping. With added torque or hp the stock clutch cannot...

motoredbikes.com

FREE needle bearing spacers 4 high RPM

Yep, cutting up an old piston is one way to get spacers, But I doubt it gonna be everyone's go to solution I'm glad you spacers are working out for you, We all knew they would,

motoredbikes.com

Open transfer port jugs. Spine sharpening

To get the most performance out of these motors you must maximized fuel mix flow and exhaust flow. To do this we take away the restrictions that come stock with these motors. This is accomplished by porting exhaust and intake ports and cleaning up transfer windows. One must also portmatch the...

motoredbikes.com

Very effective DIY velocity stack $15

So I built a velocity stack and it works absolutly fantastic. Today when I took the stack off my bike was so rich that I couldnt adjust it properly to run. Since I tuned it with the stack on I never realized how good it actually works. Here is what I did. Bought a $10 torch lighter that stands...

motoredbikes.com

Turning an ebay CNC 12cc head into a 7cc powerhouse.

It's just a punch to the face when somebody tells you your posts are not helpful to others I would like to know in other people's eyes what is more helpful? somebody that tells you what is the norm and talks to you about what it should be. Or somebody that pushes past the norm and innovates new...

motoredbikes.com

DiY small muffler/silencer. Stainless steel finish

While toying with the idea of a dual exhaust. I thought of somthing super clever. Homemade silencers that are the perfect size, sound great, and have a factory like finish. This is what my mind put together. You will need a welder or JB Weld can be substituted, empty paint can, tin snips...

motoredbikes.com

Bofeng Carb Boring.

I found a way to bore out the bofeng Carb That does not effect the first 3/4 of throttle response, air/fuel ratio, and will give you a 3mph gain when held wide open.. This mod might not work if your motor is not ported, port matched, and case matched. Take the stock intake tube bore out the...

motoredbikes.com

 

[GW's Motorized]

POWER PIPE. Hand built and tuned from scrap

So on a quest to build a tuned pipe or just a better pipe. I have taken 3 different expansion chambers and hacked them up. Im going to use the part that best fits my calculations off each pipe. combine them to make an overall better expansion pipe.. However when i cut open the nasty jack I was...

motoredbikes.com

Stock clutch hack (never slip again)

Hey guys hear to post a very cheap and reliable clutch hack without screwing with springs or buying an aftermarket plate. If your like me and have moded your motor and tuned it perfectly then chances are your stock clutch is giving in and slipping. With added torque or hp the stock clutch cannot...

motoredbikes.com

FREE needle bearing spacers 4 high RPM

Yep, cutting up an old piston is one way to get spacers, But I doubt it gonna be everyone's go to solution I'm glad you spacers are working out for you, We all knew they would,

motoredbikes.com

Open transfer port jugs. Spine sharpening

To get the most performance out of these motors you must maximized fuel mix flow and exhaust flow. To do this we take away the restrictions that come stock with these motors. This is accomplished by porting exhaust and intake ports and cleaning up transfer windows. One must also portmatch the...

motoredbikes.com

Very effective DIY velocity stack $15

So I built a velocity stack and it works absolutly fantastic. Today when I took the stack off my bike was so rich that I couldnt adjust it properly to run. Since I tuned it with the stack on I never realized how good it actually works. Here is what I did. Bought a $10 torch lighter that stands...

motoredbikes.com

Turning an ebay CNC 12cc head into a 7cc powerhouse.

It's just a punch to the face when somebody tells you your posts are not helpful to others I would like to know in other people's eyes what is more helpful? somebody that tells you what is the norm and talks to you about what it should be. Or somebody that pushes past the norm and innovates new...

motoredbikes.com

DiY small muffler/silencer. Stainless steel finish

While toying with the idea of a dual exhaust. I thought of somthing super clever. Homemade silencers that are the perfect size, sound great, and have a factory like finish. This is what my mind put together. You will need a welder or JB Weld can be substituted, empty paint can, tin snips...

motoredbikes.com

Bofeng Carb Boring.

I found a way to bore out the bofeng Carb That does not effect the first 3/4 of throttle response, air/fuel ratio, and will give you a 3mph gain when held wide open.. This mod might not work if your motor is not ported, port matched, and case matched. Take the stock intake tube bore out the...

motoredbikes.com

Awesome! Thanks!

 

[Jayraye39]

Guys please note on the carb boring mod I went 1.5 mm grinded on the top roof of the carburetor today I found out that 1.6 mm is too much and will trash the carburetor so to be on the safe side I would not grind no more than 1.2 mm on the top for that modd