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  1. xXNightRiderXx

    79cc Sportsman Flyer build

    I was waiting for this, lol. Good to know that you're getting things figured out. When I finally manage to get that carb, that'll come in handy. Month after next, I'll finally be able to build those new wheels for my bike, and then I can worry about the carb. My only concern is that the rear...
  2. xXNightRiderXx

    79cc Sportsman Flyer build

    Bogging and stalling uphill would suggest too much fuel. Try a .040 jet first, see what that does. Sometimes, smaller adjustments get you further than larger ones.
  3. xXNightRiderXx

    79cc Sportsman Flyer build

    Pretty clever Eddy, done in true American fashion, lol.
  4. xXNightRiderXx

    79cc Sportsman Flyer build

    That's what I had to do with my gallon tank. It would only fit further back on the top tube, so any straight barb would kink the hose, so I threaded in a 1/4" swivel elbow barb to clear my cylinder head and keep the fuel line as smooth as possible.
  5. xXNightRiderXx

    79cc Sportsman Flyer build

    I'm thinking of adding a paper filter between the petcock and the carb, further filter out any sediment that remains. Once I get my 178cc 5 speed chopper built, I'll continue modding the 79cc 8 speed.
  6. xXNightRiderXx

    79cc Sportsman Flyer build

    I don't use a fuel screen, that's what the filter's for. If your fuel screen is causing problems, just delete it. My fuel system has no problems now, other than proper AFR. My filter: https://www.amazon.com/dp/B000VSDZIK/ref=cm_sw_r_cp_apa_glt_fabc_8WTH7525E6MRP24VVCMP?_encoding=UTF8&psc=1...
  7. xXNightRiderXx

    79cc Sportsman Flyer build

    I have a 1/4" glass filter with a superfine plastic mesh. My gas tank attachment is a 1/4" elbow swivel barb, to clear my engine and ensure a clean line with no kinks. I have a petcock between the filter and the carb, where the line transitions from the 1/4" to the 3/16". No debris is causing a...
  8. xXNightRiderXx

    79cc Sportsman Flyer build

    Because of the angle of my engine, I have to use the diy kit. However, I don't have a welder, which is why I either need a carb that will bolt right on or a clamp on/spigot mount carb. I can use heater hose for the spigot mount carb, and if it's for a two stroke, then I'll just adjust the fuel...
  9. xXNightRiderXx

    79cc Sportsman Flyer build

    The main difference is the pz19 is made for four strokes, the phbg is for two strokes. I'll have to make mixture adjustments to compensate for that. Does your pz19 just bolt right onto the engine, or does it need a specific intake? If it needs an intake to match it, I'll have to have one made...
  10. xXNightRiderXx

    8 speed 79cc revival

    I found a company that has done custom cams for this engine: performancecams.com $135 for a custom welded profile. What I'm thinking is offset timing, but maintaining the intake opening position and making the closing position a few degrees later, and maintaining exhaust duration, but moving...
  11. xXNightRiderXx

    79cc Sportsman Flyer build

    Well, I may just have to reevaluate my jetting options. I've got a #78 in it now, but the stock was #65. With this carb, I might have to do a #75 or #72. I can readjust if I need to with the dellorto.
  12. xXNightRiderXx

    79cc Sportsman Flyer build

    I'm gearing up to get my wheels built in a couple months. Until then, I'll be pulling my engine and doing some port work with double cut carbide bits and 80g sanding spirals. For the exhaust, I'll be using 400g spirals. My brother has a DeWalt 20v drill I can use.
  13. xXNightRiderXx

    Cutting down on frame vibrations and stress cracks

    The expanding foam is great for high frequency vibrations, but won't do much for engine vibrations. It's been tested by Spank Industries in mtb components for exactly what it's good for. High frequency vibrations fatigue the rider on long rides, both on motorbikes and mountain bikes. Your best...
  14. xXNightRiderXx

    79cc Sportsman Flyer build

    Maybe not, but it is easier to remove the governor in one whole piece and then tap the hole with the flywheel removed.
  15. xXNightRiderXx

    79cc Sportsman Flyer build

    Lol, my bad. It's a phbg 19. Dellorto. I might just go with this one, since I already have an intake that will bolt onto my engine and uses a clamp on carb. https://www.treatland.tv/dellorto-PHBG-AS-19mm-clamp-style-p/dellorto-phbg-19-as-2506.htm It has mixture screws, it has a pull choke, I...
  16. xXNightRiderXx

    79cc Sportsman Flyer build

    I've bypassed the entire governor system. The carb is now directly actuated by the throttle linkage. And yes, I know the carb is bored super small (17mm) for this engine, that's why I'm looking for a 19mm ID intake so I can use the pbhg 19. I can use a piece of 25mm ID heater hose as a collar to...
  17. xXNightRiderXx

    79cc Sportsman Flyer build

    Actually, now that I think about it, 3 month old gas can cause some issues. Maybe try with a fresh can? What is the jet size currently in your carb? If it's below #80, that could be the culprit. Using my stock carb and my high flow air filter, I get better power when I use a #80 than when I use...
  18. xXNightRiderXx

    79cc Sportsman Flyer build

    Yeah, you're too lean. With a 4 stroke engine, it's easy to tell. If you gain power with less air, your jet is either too small, or your needle too low. I'd say lower the clip a notch and retest. If it's still lean, lower the clip another notch. If it's still lean, then jet up one size and try...
  19. xXNightRiderXx

    79cc Sportsman Flyer build

    Will you also be adding a cam, or keeping the stock cam? I'm wanting to modify my valve timing a couple degrees, make it as efficient as possible. Have the exhaust open a couple degrees later and the intake a couple of degrees earlier, and have them both close a couple degrees later. In...
  20. xXNightRiderXx

    8 speed 79cc revival

    I probably could have made this better. I'm the one who wrote it, and after all this time of not even thinking about it, I'm having a hard time deciphering it. So, I'm going to streamline my wiring representation once I've redone my wiring. And yes, I do need to redo it. It's a rats nest and...