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Motorized Mountain Bikes and Road Bikes Motorize a full suspension mountain bike to get a smother ride or for a little more speed try motorized road bicycles. This section is for sharing ideas on motorizing your mountain and road bikes.

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  #1  
Old 01-12-2017, 02:15 AM
xXNightRiderXx xXNightRiderXx is offline
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Default i want to know, what should i install on my bike before a jackshaft, performance-wise

i have been looking at installing a jackshaft for quite some time before i actually got my engine, so i was wondering, what would you guys install to get the most out of the engine before installing the jackshaft?

I have a kent roadtech with an 80cc two cycle engine, zero upgrades, two replacement parts.

Last edited by xXNightRiderXx; 01-12-2017 at 02:19 AM. Reason: additional information
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Old 01-12-2017, 03:29 AM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

new fuel line, spark plug boot, fuel filter, air filter, custom expansion chamber (big one), port the engine, sand down the cylinder head, replace all the mounting hardware, to name a few.
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Old 01-12-2017, 07:05 AM
xXNightRiderXx xXNightRiderXx is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

those seem pretty basic. what im talking about are things that will let me get the most i possibly can out of this chinagirl, and im willing to spend up to quad what i paid for the kit.
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Old 01-12-2017, 12:52 PM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

Quote:
Originally Posted by xXNightRiderXx View Post
those seem pretty basic. what im talking about are things that will let me get the most i possibly can out of this chinagirl, and im willing to spend up to quad what i paid for the kit.
Some of those are basic, but not breaking down every 50 miles is a huge plus. Also, a big, well tuned expansion chamber is pretty much the single best thing you can do to get more power. Oh yea btw, none of the chinagirls are 80cc. The ones that say they are 80cc are actually 66cc.
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Old 01-12-2017, 06:29 PM
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Agreen Agreen is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

He gave you the right list. I'd only add a CRmachine Fred head, instead of sanding the original one down.

If you're real serious about performance, download a copy of Gordon Jennings's 2 stroke tuners handbook. You will learn about proper port timing, size, and shape, as well as everything else needed to make a 2 stroke scream.
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Old 01-12-2017, 08:48 PM
TheNecromancer13 TheNecromancer13 is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

Also, if you don't get a jackshaft, you'll want to get a hub or disc sprocket adapter so you don't rip the spokes out of your wheel.

And you will probably have to get a smaller carb jet as well, most of the 2 strokes run so rich out of the box that they'll 4 stroke even at the leanest carb setting.
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Old 01-12-2017, 11:52 PM
xXNightRiderXx xXNightRiderXx is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

Well, now I have a big problem with this engine. At idle, the rpms fluctuate, though I'm not touching anything. Also, when I try to engage the clutch, I do like you normally would, slowly with a bit of gas, but the motor acts like its getting too much or too little, idk which, and tries to die. What are the causes for these issues?

Edit: I feel I should have added this in the beginning, but im looking for a good balance between speed and torque, favoring speed. Also, if there is anyone in Las Vegas who can help, I would really appreciate it. I'm also thinking of building a jackshaft instead of buying a kit. I just installed rubber grips from a phone mount that seemed sufficient, and vibration is definitely around 25-30% what it used to be.

Last edited by xXNightRiderXx; 01-13-2017 at 01:34 AM.
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  #8  
Old 01-13-2017, 03:28 AM
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Tyler6357 Tyler6357 is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

An upgraded exhaust pipe is probably the best thing you can do to get the most out of a china girl with respect to performance.
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Old 01-13-2017, 07:38 AM
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wing nut wing nut is offline
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Default Re: i want to know, what should i install on my bike before a jackshaft, performance-

if your that serious & you have the $$$ then look at these
http://www.arrowmotorizedcycles.com/index.html
i have an older arrow 4.5 street racer & it did 45mph out of the box
...if you have a rpm fluctuation issue , you may have an air leak some where

Last edited by wing nut; 01-13-2017 at 07:40 AM.
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