My second build HOT ROD

Discussion in 'Photos & Bicycle Builds' started by 45u, Apr 10, 2016.

  1. 45u

    45u Active Member

    My second build is going to much longer do to expanse and being a scratch build. This one is going to be my HOT ROD and will be tricking the engine out since I have my stock daily rider. Biggest thing I am trying to figure out is what wheels I am going to run or build. Any suggestions are welcome. A few things I have gotten so far.
    Thanks
    Jeff

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  2. Frankfort MB's

    Frankfort MB's Well-Known Member

    From what I've heard those frames can't take a wide tire so I'd probably run 26x1.95ish.... I like a wide tire myself so I'd do some modifications to run the 2.4 cyclops tire which is a nock off maxxis hookworm for only like 15$ a tire, I'd also run a black 80cc HT engine with a Puch chrome head for looks mainly but a power increase, a coaster brake rear with a disc brake front end, a laid back seat post with some small 10 in rise apehangers, black frame with accents of chrome.... Aka handlebars, wheels, cranks, sprocket.... All this would equal to a build especially those monarch forks ;)
     
  3. 45u

    45u Active Member

    Going to run 26 x 2.35 tires and the frame can run them. I all ready have the USA made higher compression head.
    Thanks
    Jeff
     
  4. Hello Moto!

    Hello Moto! Active Member

    Check out this site for a lot of different heavy duty wheels. http://custommotoredbicycles.com/ch...26_inch_x_2125_assembled_in_usa_better_chrome This is where I plan on getting mine.

    I just ordered a skyhawk frame and some triple tree forks elsewhere for a new project. We're about in the same stage except my frame and forks are still on the way lol.

    Oh by the way here's a link to a good video on how to install your headset without buying a $70.00 tool. You can make your own!

     
    45u likes this.
  5. 45u

    45u Active Member


    Thanks for the video. I have several neck cup tools for motorcycles I think I can get one to work or adapt to work.
    Thanks
    Jeff
     
  6. 45u

    45u Active Member

    Hope fully I will be ordering a SkyHawk GT5A since the GT5-SR is not imported to the US.
    Thanks
    Jeff
     
  7. butre

    butre Well-Known Member

    I didn't even know there was a tool for it. I have a foot of 3/4 threaded rod and some nuts and washers for installing headsets and it's worked great for years.

    you can also get them in with just a mallet if you feel so inclined.
     
  8. 45u

    45u Active Member

    I will be running a Mikuni VM Series round slide carburetor 18mm clamp mount VM18-144-WP .
     
  9. 45u

    45u Active Member

    Order this for the project today. Think I got a good price $145 shipped. I will not be running the carburetor, exhuast, gad tank, or sprocket kit as I will be up grading all of these.


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    Last edited: Apr 26, 2016
  10. 45u

    45u Active Member

  11. 45u

    45u Active Member

    This is the pipe I am going to try.

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    Doug Foster likes this.
  12. 45u

    45u Active Member

    I will be doing my own porting, port timing and cutting piston. What do y'all think or recommend?

    Just remove 1.6mm from the piston intake skirt and use your rotary tool and cutting disc to raise the exhaust port by 1mm increments till you achieve the speed you want. Use a small file to round off the newly formed lip where you removed metal. That is to prevent the piston rings from snagging on that lip.
     
  13. butre

    butre Well-Known Member

    are you going to go with a reed valve or no?

    for piston port engines I trim the piston skirt, widen and polish the exhaust port, install a second base gasket, lower the intake port back to stock, increase the intake duration, stuff the case, cut out the transfer walls, remove any casting flashes from the transfers, and notch the piston at the transfers for more duration and better flow

    for reed valves I do the same thing plus cut a window in the piston and a third transfer over the intake.

    I don't suggest using a cutting disc, a carbide burr will give you much cleaner results. if it's an option a milling machine makes widening the exhaust port much easier.
     
  14. 45u

    45u Active Member


    What carburetor are you running? For now no reed valve. When you say stuff the case are you talking about reduce case volume? Do you by chance have any pictures?
     
    Last edited: Apr 26, 2016
  15. butre

    butre Well-Known Member

    I'm using a Keihin PZ19, but it's not working too well with my current setup (carb is at a fairly extreme angle due to clearance issues) and will be switching to a diaphragm style from a pocket bike sooner or later.

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    I go a little further than that and weld in some material between the case halves too, just enough that the rod end doesn't smack it.
     
    Last edited: Apr 26, 2016
  16. 45u

    45u Active Member

    On my 1/5 scale radio control buggy they do not come with full circle cranks so they make stuffed cranks to take up some crank case volume. On my RC buggy I run diaphragm carbs on them.

    On my first build I have a SHA on it as the stock carburetor would not fit. I all so had to change the front engine mount to get clearance but it does not rub anywhere now.
    Thanks
    Jeff
     
  17. Hello Moto!

    Hello Moto! Active Member

    Can't wait to see it once you start puttin it together man. I haven't got a motor for my frame yet. I'm trying to decide between goin with an actual skyhawk motor in suit with the frame or maybe a pk80 motor.
     
  18. Frankfort MB's

    Frankfort MB's Well-Known Member

    I actually bought the same exhaust and was going to try it after I get my bike running right after a new top end hope they work well
     
  19. 45u

    45u Active Member

    I have my Sky Hawk on the way so I know what I will be running. Once here first thing is to tear it all the way down. The eBay motor I bought for my other motor bike had a bunch of trash, grit and dirt in it. Glade I took it all apart. On this build will be doing much more to the inside.
     
  20. Hello Moto!

    Hello Moto! Active Member

    I must of been lucky with my eBay motor, it runs great. Been messin with carb jets and it's almost there. I got to 30mph yesterday with a 44t and weighing 240. Not bad for all stock with what they refer to as a HP carb. In fact, the eBay motor runs a hell of a lot better than the gasbike silver slant I mounted for a brief time. In the future I will spend the extra and go with either a skyhawk motor or maybe a pk80 just for some kind of reputable quality straight outta the box. Other than that, I have no problem with stock performance with the HP carb. It's like a cheap Dellorto knock off but is a big improvement over the stock NT. I might start a build thread once I get a few more parts for the skyhawk frame.
     
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