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Discussion Starter · #1 ·
I am going to look at and probably purchase 3 pocket bikes tomorrow, 2 cags and a cateye I am only looking to mod one cag as of right now, where should I start for mods to make it go faster? What is the most bang for the buck with them? I have worked on them before but not a lot. I did a head kit on one, but I didn't grind any ports or anything in it, just got one from daves discount motors, also where is a good place to order from? The cags are MTA2, below is the link to pics of them.

http://www.pocketbikeplanet.com/showthread.php?t=79782
 

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I got the billet head kit on my avatar Lucky 7 bike on eBay for $75 to my door, came with a 12mm FC crank, piston & rings, cyld, 4 pcs head, extra set of rings & gaskets new China plug and all, think there was a small rocket key also. Getting a package deal is the best & cheapest way. Then you can port the cyld when you get it.
 

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I mean should I start there, or start with like bigger carb or exhaust or something? Also how much power will that add?
I always start with fuel delivery,,air induction,,basic mods,,power mods and then exhaust.........It depends on how much power you want as to the type of mods needed to be done.............

Theres membere all over the forum doing engine builds.....One member is just giving his newer model 43cc cag a lil more uumph with some simple mods and so far he is quite happy with the results versing the mods so far but plans on going bigger............

http://www.pocketbikeplanet.com/showthread.php?t=79663
 

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So I think I will start with flushing all 3 fuel tanks and lines. And I want to put a new carb on one cag. What carb would you recommend to get and what air filter?
For the cag id get a WT603 pumper carb retrofit kit.....A floater carb on a small engine isnt too efficient compared to an easy to tune-in pumpercarb...The airfilter you need a 3" UNI foam airfilter



 

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Discussion Starter · #9 ·
What does a carb setup like that usually run? I have a dremel and thinking about just porting out the carb for now? As my plastics are a lot worse shape than I thought and I am not sure if I want to continue with the fixing, or just order some more when I get the money hopefully this week.
 

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If you want more power every little bit helps. Bigger intake and exhaust systems & more compression are the best way to get more RPMs & Power. I started buy modding my stock stuuf then later started building hp engines.
 

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Discussion Starter · #13 ·
I have been searching for the thread that shows how to port the carb but have came up empty handed. Will I have to rejet after porting? What else can I port with my dremel here at home to "open it up" a little bit. My exhaust can part(very end) is loose and just flapping around, should I just weld it back or is there a mod to do to it since it is broke now?
 

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Most taper the front out to the choke ring I go half way thru it. You can bore out the back side to 14mm / 9/16" but I would not try it with a drill, the walls are thin, and if you go to big air you pass by the sides of the carb piston. Here is a carb I modded.
 

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Im pretty partial to taperporting a carb with a 2 stroker...That bottleneck creates alot of velocity kind of like a pressure builder for a compressor......2 strokes thrive on velocity...4 strokers thrive on larger volume..



 

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Discussion Starter · #16 ·
Yea I went through and tapered it almost to the walls, did not wanna take the chance to go farther, since I will replace it sooner than later. I will replace it with a kit with vstack and everything.
 
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