A possible increase in hp?

Discussion in 'Performance Mods' started by woods39, Mar 27, 2007.

  1. woods39

    woods39 Guest

    I dont receive my China motor until next week. But I was thinking that if I took off my air filter and attached a computer fan in place and sealed it, do you think it would increase hp when turned on? Just thinking.......... please no criticism necessary!!!! :grin:

  2. jeffspeeder

    jeffspeeder Guest


    well i thaut of doing that but the problem is that the rpms would be high and it would blow all the dirt and junk in thare so i would keep the stock air filter i did a little tune up on my airintake i took a T shaped pvc and took 2 l joint and pointed them forward it really works and inreases air flow i would recomend that just let me know if thats whaut u wanna do ill give u the rest of the info of how to put it togeather
  3. woods39

    woods39 Guest

    Re: w

    Awesome I can imagine what you are talking about but would still appreciate directions on how to accomplish
  4. jeffspeeder

    jeffspeeder Guest

    ok but

    ok but u will have to get the average size pvc tubeing and make shure its the thin wall tube and get the T or just a 2 way connector and cut a 1 2 inch peice of pvc and put 1 inch on each side it needs to be small because u know thare aint much room to do this and thare a curve joint and put it on the end of the 1 inch pvc peice sticking out of the T joint (make shure u glue it or it will raddle out) pointing to the frount of the bike and u have to cut the T joint so it will fit over the air cleaner and u have to take the air filter and point the intake part up the opposite way and take a screw and screw the pvc to the air intake it will be faster.

    tell me if u did not understand and ill explain it to u
  5. jeffspeeder

    jeffspeeder Guest

    here are some pics of my intake
  6. Guest

    Guest Guest

    No, a fan won't work as a "blower" or "tubo" not nearly enough pressure.

    Opening up the intake such as the above method may help slightly, but you will want to watch that you don't make the engine run too lean by doing so.

    You may need to adjust the mixture after doing so.
    Bufu racing#1 likes this.
  7. jeffspeeder

    jeffspeeder Guest

    i would say turn ur gas and air mixtur 1 and a half turns it should run good
  8. Guest

    Guest Guest

    O.K. conflicting reports here- I've been told that these engines don't have a mixture screw...Augi? The mixture screw would only be for idle mixture anyway.
  9. gone_fishin

    gone_fishin Guest

    the basic carb that the chinese engine comes with has a screw that mechanically adjusts the idle, nothing else.

    mixture is adjusted by changing the position of the circlip on the main needle.
  10. jeffspeeder

    jeffspeeder Guest

    the method i show at the top i actually replaced back to normal for now it was not really any real big difference in hp but i noticed a little bit in top speed it helped i figured out. so when i fing a better looking and working mothod ill let you know
  11. Guest

    Guest Guest

    A better set up would be a free flowing but adequate air filter element and the carb set up to handle the extra airflow. :eek:
  12. Tom Franks

    Tom Franks Guest

    Hi Augi, My name's Tom Franks. A while back my 48cc engine (1 yr old ) was really bogging down. I (finally!) traced the problem down to the exhaust being a bit clogged. I carefully broke up some of the carbon in the exhaust pipe, then cut out the baffle one inch from the end cap. Well, lol, that did the trick!! My fuel metering needle (main needle in carb) has 4 groove settings. What would the best setting be for this lean running engine in a hot, sunny place like San Antonio, Texas? 80-100 degree heat (most of the year) somewhat humid. Thank you for your expertise, Tom :cool:
  13. gone_fishin

    gone_fishin Guest

    if this turns into a topic, i'll split it off, so don't be shy.

    tom, instead of expertise, i'll tell you what i'm up to right now...my local atmosphere is moist, but much cooler. i'm not sure what or how to adjust based on temperature. i'm sure someone here does.

    i'm at completely sea-level, matter of fact i'm seaside. i have a new magneto & CDI, new ngk b6hs, new race quality wire & boot. i have a 6V/3W bulb wired thru a switch to the white wire. the air-cleaner is a full-flow homemade thingy, the muffler is gutted but capped with the small outlet. 44 tooth sprocket. 26X1.95 tires.

    i got'er back on the asphalt this afternoon & been tweaking and test-riding all evening, finished the headlight after sunset.

    i use 36:1 real oil pre-mix.

    .020 spark plug gap.

    mixture is set at 3rd slot down

    slight bore on jet (yes, 'davo, i finally did it)

    she starts & runs really great, pulls hard from a standstill all the way to top-end, no bogging. bike & rider weigh about 275 & with a digital speedo i show a top-end of 28mph.

    i don't know if my parameters meet your needs, but i'm not getting a lot of carbon. people are gonna wanna know what you're running now: mix ratio & type, plug & gap, etc...

    boy, i'm feeling good tonight, and i realised i mostly just rambled :lol:

    did any of that help? let's wait for the real experts to chime in...
  14. Guest

    Guest Guest

    Tom, can I help? Carbon build up is from an over rich (IN OIL) mixture...run the fuel oil mix at 36 or 40/1 synthetic oil (cheap at Wal-Mart, K-Mart, Lowe's Home Depot, ect)

    San Antonio is at what altitude? If you are 1000 feet or under, I would start at the second slot from the bottom. Third slot may be too lean. No power, hot running, engine seizure.

    augi, glad you liked the "jet drilling" thing. :D
  15. Tom Franks

    Tom Franks Guest

    Hi, Joe, one thing abit odd about my motor is that when I recieved it (Feb. 06') the first thing I saw was a piece of paper that said to dismiss what the oil-fuel mix ratios were in the manual, and instead mix this: the 1st gallon they said to mix 7oz. of oil with 1 gall. the 2nd gallon mix 6oz. of oil with 1 gallon, and 3rd and thereafter mix 5oz. of oil to 1 gallon gas. Has anyone else heard of the Co. Birddog distributing doing this? Is this usual? I didn't get a actual 1:? ratio; just oz-gallons. :?
  16. Guest

    Guest Guest

    I ran about 30 minutes of break-in time with 20/1 Penzoil. I rode the next 15 miles or so at 36/1 with the same oil. After this gallon is gone, I'll go to my Poulan synthetic or Yamalube semi synthetic at 40/1.

    Kinda the same thing as you describe, but with a lot less oil in my case.

    It's safe.
  17. Tom Franks

    Tom Franks Guest

    Thanks alot, Joe. if it's safe to run with a 40:1 oil fuel mix, I'll do that then. I've had some unburned oil drip out of the exhaust before, so I'll cut back on the oil, then. And I'll set the metering needle at 2 grooves from the bottom. thanks again!! :grin: :cool:
  18. Thejman

    Thejman Guest

    What is the metering needle you guys are always adjusting. That is going to be a totally noob question. Are you talking about the idle adjustment?
  19. jeffspeeder

    jeffspeeder Guest

  20. azbill

    azbill Active Member

    the mixture needle is on end of throttle cable with circlip and c-washer
    the idle adjustment is done with the screw on the side of the carb with the spring behind it