How to Port a 47/49cc Pocket Bike Engine

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1. if you shave the counterweight on the crank like a spear it increases rpm a shit ton
2. ok got you thanx
3. so what do u suggest I have a mini quad that does not start I purchased a high-performance carburetor and was looking into one of those Motors just as an engine swap
4. hey have u used those high performance motor from ebay that go for $129 are they any good?
5. I'm rebuilding one of these motors now as well got off my cousin for free except it has electric start and charging system
6. The valves in the carbs on these bikes are just screaming sloppiness. Take the intake manifold off the block and screw it on the carb and you'll see how restrictive those valves are. Port 'em.
7. or rpm
8. aye does porting the engine increase speed
9. Hey man, I noticed you had the same engine as my mini bike. I've been having troubles starting it up I know I have spark because I bought a new spark plug for it but the thing is it seems to leak from the carb, it looks to be missing a fuel return line, I don't know much about these 49cc's but I'm thinking that could be the problem?
10. yo how fast is it now
11. can anyone help me I got a 49cc pocket bike 2 stroke but I'm not getting spark
12. after i did this i used a tachometer full throttle @ 8,256rpm no load on the back tyre
13. Hahaha great portjob, it'll run - just as before. Waste of time when you don't even note the scavenge timing or know what it is ... Randomly ported cylinder, will rather lack a lot of power ...
14. how was the torque loss? top end loss? did you even gap the sparkplug a little more or lessor change its heat range? cause that messed with alot
15. The reason you replaced the top end TWICE,you DONT KNOW WHAT YOUR DOING
16. That's not a dremel... That's cheap shit $2.99 harbor freight rotary tool
    And that shit won't be able to properly do a port job nigger
17. Drop it into a bucket of some diesel to clean it out.
18. a nice carb, reeds, and exhaust will go a very long way too. those Chinese stock carbs blow ass.
19. Pocket bike engine is NOT a race motor!  OMG...
20. u should make a video of how to bulid a whole mini bike out of scrap cuz i just finshed mine and i had some promblems and u should throw in some tools for the winnings