horse power pipe and carb dirt cycle

Discussion in 'Photos & Bicycle Builds' started by ultimusmaximus, Jan 26, 2008.

  1. ultimusmaximus

    ultimusmaximus New Member

    here are some pics of the new hp carb and super performance pipe mods... the difference is amazing in power!!! and the sound is super cool too... instead of the stock boring sound it has a very crisp snappy pop sound, and its also completely out of the way of your leg... and now i can hall a** up this big dirt hill i had to help peddle up before... i also skimmed the head, ported, and put a 56 tooth sprocket on so it cruzes at 25 istead of 35, but throws dirt up when accelerating off road! these mods have got to bring it up to 4 or 5 horse instead of stock 3.5 horse... if i put the original 44 tooth sprocket on im sure it could exceed 40 but im more into power...
     

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  2. Nice....good that it is not in the way of the legs too!

    Andrew
     
  3. SirJakesus

    SirJakesus Guest

    Awesome off road machine! With that setup do you encounter much offroad terrain that it cant handle? I bet you can practically take off with that thing with clutch control only with that much gear reduction. Cool stuff thanks for the pix. Thinking of making these things for sale?
     
  4. ultimusmaximus

    ultimusmaximus New Member

    thanks jake... there are off road fire trails behind my house that are hilly and before i couldnt make it the hills with out peddling, but now i can practically idle up them... its no struggle to take off with clutch control even up hill! it took a lot of customizing and machining to get everything to fit properly but its definitely doable
     
  5. SirJakesus

    SirJakesus Guest

    Good to know, i had basically given up on the idea of using my HT mountain bike in anything more off-road than dirt roads as it just didnt have the torque to keep the bike going without slipping the clutch constantly. It doesnt look like you've done anything special with the sprocket hook up though, any problems with that kind of torque on the spokes yet? I killed a couple good wheels riding my MTB hard before i tore it down to build my chopper. I can only hope you bring a friend out on those fire trails with a digital cam to take some videos. I bet that thing could even tear it up even through deep snow. Totally sweet :)
     
  6. cwucat42

    cwucat42 Guest

    Gnarly looking ride! Love the red engine.
     
  7. Hi,
    Hard to tell from the pic but what carb did you use?
    Thanks
    Andrew
     
  8. ultimusmaximus

    ultimusmaximus New Member

    i have actually broke a few spokes before the mods but i just buy new ones for a couple bucks and replace them... the new setup is so new i havnt broke any spokes yet... im sure they will break eventually, but the next project is to get a more efficient sprocket setup... maybe a disk break and mount the sprocket to the disk... ive seen some guys do that, or a different wheel... we will see, if you guys have any ideas love to hear... thanks
     
  9. ultimusmaximus

    ultimusmaximus New Member

    andy, its the big bore horse power carb from pocketbikes unlimited... i wasnt sure how it would work but it turned out perfect with very minor machining... great fit and excellent performance...
     
  10. Easy Rider

    Easy Rider Guest

    Looking good Maximus! You did a good job on the header pipe!
     
  11. ultimusmaximus

    ultimusmaximus New Member

    haha thanks Rider, ill have to put up some video for everyone to see. oh and if you have anymore tips Rider or anything let me know thanks...
     
  12. cooltoy

    cooltoy Member

    Thats what I love about this site,just when you think youve seen it all, a person "invents" a new and better way. I hope you tell us what machining you did to carb and where you got the "parts" for the muffler. I want more info, please!
     
  13. ultimusmaximus

    ultimusmaximus New Member

    just drilled out the holes and machined down the manifold for a better fit, it doesnt require much at all... as far as the "parts" for the pipe, i used a one inch peace of steal tubing with a u bend in it, welded it to the pipes flange, bended accordingly to fit between peddles and chain then welded it to the expansion chamber... turned out to be an excellent header pipe!
     
  14. cooltoy

    cooltoy Member

    Thanks, so you did not really have to machine the carb.drilling bigger holes is not a big deal at all.So I guess you bought the end ( expansion chamber)? Is it a little quieter for sneaking around the city? I know you called it a "crisp sound" and I like the sounds of that but I have to be a sneaky little , under the radar kind of guy! lol
     
  15. now THAT is a sick ride. very cool modifications! It's amazing to hear how that thing pulls off road... makes me want to do some work on the old motored bike!
     
  16. ultimusmaximus

    ultimusmaximus New Member

    hey cooltoy, yeah i bought this expansion chamber http://www.earthscooters.com/exhaust.html and this carbhttp://www.pocketbikesunlimited.com/BIGBORE.html the carb required just minor machining on the manifold for a better fit along with the holes drilled... and the sound of the pipe is louder than stock especially at low rpm, but once you raise the rpm it sord of milds out... if you are trying to ride sneeky, this pipe is not going to help, its more of a performance pipe, but it does sound awsome... it sounds like this from idle, to acceleration, back to idle - pop pop pop pop, vvrrrrrrruuuuuuummmmmmmmm, pop pop pop pop... lol
     
  17. ultimusmaximus

    ultimusmaximus New Member

    thanks Jackson... i took it for a ride today after getting it dialed in and the bike pulls stinking wheelies! then i pinned it in the dirt and the rear tire breaks loose especiall when turning! also the streets were wet today and i pinned it while making a u-turn on my street and the rear tire broke loose again and spun out! on the stinking asphault! lol, im amazed at the power, i cant wait to go for a good ride tom. now that its all dialed in..
     
  18. Egor

    Egor Guest

    Good looking bike, looks like a lot of fun. A few questions, Is that a roller bearing small end engine? Did you change the intake timing? I have not messed with the transfer ports, did you raise or widen them? I have the exhaust at 1.1 in from the top, and wider all around. That carb looks like it would make a big difference, the Walbro is a good choice, I have not tried a pulse carb yet. Think about a reed block on the intake with the flow through the piston, I would like to hear some more feedback on that system. I am trying to put one together. If you go there, I will let you know how to introduce another port for intake, if you don't already know about that. I get it from the old Hodaka days. I guess you would call it a fourth port on one of these. Do a search here for "reed valve" Have fun, Dave
    PS: I went looking and saw you were posting over at the Easy Rider mods. Think about the reed induction I think you would like it in the off road conditions, should pull like a freight train.
     
    Last edited by a moderator: Jan 28, 2008
  19. ultimusmaximus

    ultimusmaximus New Member

    thanks Dave... the engine is an "80cc" from spooky tooth... i havnt messed with the transfer ports either, it seems kinda hard to get in there... and the header pipe manifold is machined to match the cylinder... the cylinder/head is skimmed down to increase the compression with a better spark plug. the reed block sounds awsome, talk to easy rider about that, he showed me a race bike with the same engine with a reed cage on it and it looked pretty trick... and let me know of any other little mods or ideas you think would help... thanks Dave...
     
  20. Ultimusmaximus,
    I have good news - i will be in LA later this year as a promotion for our new bikes - and i hope that i may be able to entice a few of the "enthusiasts" to get down to a track for a bit of a ride/race. We will even throw some cash in for prizes etc. We will have some bikes for testing (thrashing) and will be looking to get some local support but more details on that to follow. Perhaps you may want to join us and bring that filth ride with you? Got any companions who also may take an interest in showing of thier creations?
     
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