Please need help, very disappointed.

Discussion in 'General Questions' started by JVROOM, Oct 28, 2012.

  1. JVROOM

    JVROOM Member

    I need some help, 66cc, slant head, Jaguar CDI, expansion chamber, reed valve kit,Dellorto carb. Having trouble, tuning, not running a very well, that is inconsistent. Only 11 miles on engine, am I being too impatient and need some break in time? Very disappointed, because old and not sure what to do next.

    Years ago I had put a five flags engine kit on the same bike, which was a friction drive roller, wow, it was only, I believe 33.9cc and it ran great, I mean really good, no monkeying around, piece of cake, easily cruise at 25, and I had a top speed, at sea level, of 33, but that was dangerous and scary.

    About the only thing I haven't done, is change the wrist pin bearing, but I'm really disappointed, with this Chinese engine and not sure what else to do.

    Certainly would appreciate any thoughts and/or guidance. Everybody on this form has been great, sincerely John :sweatdrop::sweatdrop::ack2::ack2::poop::poop::poop:
     

  2. BchCruizer

    BchCruizer Banned

    I would look into another friction drive i prefer bumblebeebolton but i hear the statons are good to. good luck i dont ride the chinese kits to much hassle for something that is supposed to be fun! good luck
     
  3. IbedaYank

    IbedaYank Member

    11 miles is not enough to break in a new motor. you need to ride it easy for the first tank with oil to gas ratio of 20-1 very the rpm but do NOT run it WTFO for more then a few seconds at a time do this for at least the first tank of fuel
     
  4. Fabian

    Fabian Well-Known Member

    What ignition curve is the Jaguar CDI set to?
    What kind of reed valve intake do you have?
    Have you changed the jetting to suit the reed valve intake?

    I have not had any power or reliability improvement with a Dellorto clone carburettor (but i can't talk for a genuine Dellorto), so i reverted back to the standard NT carburettor which operated just as well.
     
  5. Fabian

    Fabian Well-Known Member

    My 2-stroke Chinese engine runs terrifically well; the reed valve intake runs beautifully and the Jaguar CDI has been reliable and very effective at solving the problems with the standard CDI.

    The NT carburettor runs with surprising consistency.
     
  6. JVROOM

    JVROOM Member

    The Jaguar CDI is set to the default position, I think B as received. I believe that was the recommendation. The Reed valve kit is from rocksolid. I have re-jetted. A few running a little rich, a lot of Hills around here and I'm having trouble figuring that part out. Because it's just running very consistent. May have a fuel delivery problem will change the fuel filter. May go back to the stock carburetor as suggested. Consider myself a decent mechanic that this thing is running inconsistent. Thank you for all your help, John :grenade4:
     
  7. Fabian

    Fabian Well-Known Member

    If you are running the slant head, the compression will be quite a bit higher than the conventional straight plug low compression cylinder head. I would be inclined to set the Jaguar CDI to the lowest ignition advance curve (to start off) with both jumpers attached to A & B

    The Rock Solid Engines reed valve intake is a jewel like piece of billet art work, and it performs quite well, once the jetting is correct.
    In my situation the jetting needed a massive increase over standard (8 jet sizes) to account for the complete lack of reversion, which is something that i was expecting, but i didn't expect it to be such a large increase.

    With a billet Rock Solid Intake tube and (optimised) standard jetting, which in my case was a No 70, gave an EGT of 450 degrees celsius when working hard. With the Rock Solid Engines reed valve intake and a No 78 jet, it still runs at 450 degrees, so the air/fuel ratio hasn't changed despite the jetting increase.
    This proves two things a) the jetting is correct and b) the reed valve intake has virtually stopped all reversion.

    More telling is that everything is on the money; the colour of the plug with reed valve intake matches the colour of the plug from the setup with the Rock Solid Engines billet intake tube.

    When i first installed the billet reed valve intake (with a No 70 jet) it ran quite poorly, which is what i was expecting, and i spent the next three hours messing around with jet size increases of a maximum 4 jet sizes and looking for air leaks.
    It frazzled my brain as 4 jet sizes still had the engine running lean, but i thought it (must) be getting on the rich side. I wasted so much time looking for air leaks because it was obvious that it was running lean as soon as i jumped on the bike and rode it 50 meters down the street.

    Eventually i just placed a No 80 jet in the carburettor and i could feel it running rich, so i went down to a No 78 and it cleaned up the carburation beautifully, but just slightly rich. I then went down to a No 76 and it was running right on the limit, maybe just a touch lean, so back in went the No 78 jet and i felt that joyful feeling of carburation perfection, which also slightly improved the low and midrange torque over a No 76 jet, but that torque increase was nothing compared to the midrange torque improvement of the reed valve intake :grin5:

    After 2 of my next door neighbours tested my bike with the reed valve intake, they both ordered one and have since installed it on their bikes, to good effect.
    Prior to their bikes running correctly and prior to me giving them hints on jetting, they both *****ed and moaned about the engine running like a bucket of c.r.a.p when installing the reed valve intake on standard jetting.
     
    Last edited: Oct 29, 2012
  8. BchCruizer

    BchCruizer Banned

    Motorized biking shouldn't be this difficult. your supposes to buy your kit install it and ride ride ride..not work work ride..
     
  9. Fabian

    Fabian Well-Known Member

    @ BchCruizer

    I read your comment and my first thought (actually you don't really want to know my first thought); suffice to say that it was an asinine comment on your behalf. It's plainly obvious that you haven't researched how a reed valve intake works, because standard jetting on a standard style intake tube cannot be transferred to a reed valve intake. They are two totally different systems and they work in two totally different ways, so it would be safe to assume that the fueling requirements will be completely different, and two bikes in two different locations will have different jetting requirements depending on air density, air temperature and humidity. The jetting for someone riding in Miami is not applicable to someone riding in New York.

    Motorized bicycling isn't difficult, though it can be challenging when making significant changes to the electronics or the mechanical systems or the fueling system.
    My reed valve intake (to date) has over 3,000 kilometers on it; still working to perfection, and i wouldn't even think of going back to a conventional intake tube.

    3 hours of messing around with jets could have been shortened to 30 seconds if a twin needle Walbro carburettor was fitted; which is the type of carburettor everyone should install on their engine. Having said that, (even with a Walbro carburettor) there are people who could still f&*k up the carburation with ineptitude - so short of electronic fuel injection it isn't a completely idiot proof system.

    Unfortunately Rock Solid Engines still hasn't released their (reed valve compatible) Walbro carburettor, but the moment it is released, it'll be fitted to my bike.
     
    Last edited: Oct 30, 2012
  10. Fabian

    Fabian Well-Known Member

  11. Stoltzee

    Stoltzee Member

    Diagnose

    Hard to say with "Just not running well."
    I bought a used Honda Elsinore once. When I started it, it did not run even. It would start to rev up and the then go back down, up down up down. It had a break in the rubber intake behind the carb.
     
  12. JVROOM

    JVROOM Member

    I appreciate the feedback, and you are correct, I do not understand how the two cycle operates. Obviously I need to do some study. I know the four cycle inside and out, and have many trophies to prove it from my dragracing days. Likewise I have the diesel engine down pat. Little harder for me now at my age to pick up on some of this stuff, but I appreciate the comments and help. I do understand the elevation impacts, at this time I'm running a 78 jet, at 850 feet above sea level, and suspect I might be a little lean. However as I mentioned there's a lot of hills around here and think made before mess around too much more I will let the motor break-in. Thank you for all your considerations and help, I remain, sincerely John
     
  13. Fabian

    Fabian Well-Known Member

    May i make a suggestion and put forward the idea that you ditch the NT carburettor and replace it with (the just released) Rock Solid Engines Walbro style (diaphragm) carburettor and kit which has been designed to work with the Rock Solid Engines reed valve intake.

    This news is hot off the press and i've already placed an order for the kit.
    Now we can get rid of the NT carburettor, as well as the Dellorto carburettor and it's clones and replace it with something that's user friendly and dead easy to tune.

    No more messing around with jets and pulling the carburettor apart every time the wind changes :clap:
     
  14. Fabian

    Fabian Well-Known Member

    May i make a suggestion and put forward the idea that you ditch the NT carburettor and replace it with (the just released) Rock Solid Engines Walbro style (diaphragm) carburettor and kit which has been designed to work with the Rock Solid Engines reed valve intake.

    This news is hot off the press and i've already placed an order for the kit.
    Now we can get rid of the NT carburettor, as well as the Dellorto carburettor and it's clones and replace it with something that's user friendly and dead easy to tune.

    No more messing around with jets and pulling the carburettor apart every time the wind changes :clap:
     
  15. Fabian

    Fabian Well-Known Member

  16. Stoltzee

    Stoltzee Member

    Don't feel bad John. I'm getting up there too. I got schooled on this forum site the other day. Turned out I didn't know everything. Even though I own a 2 cycle with a reed valve for a short period I did not understand the difference between a gas valve and an air valve, (Mixture screws), but thanks to the internet I learned before I really made myself look dumb.
    Turns out the screw on the carb in back (Engine side) only lets more fuel in for idling CC =Rich. The screw by the breather adjusts air/fuel mixture CC=Lean.
     
  17. JVROOM

    JVROOM Member

    I am trying to order the correct Walbro carburetor and filter. Feeling like my computer has a virus, and maybe my brain, and carburetor as well. Things just aren't working the way they should? I cannot register online with rocksolid, or fix whatever I did wrong. They're great, but I have to try to e-mail for an order, it's weird, I don't know if it has something to do with the virus protection on my computer what. But, no doubt the carburetor I have now is junk, thanks for everyone's help, John ::confused::ack2::dunce::dunce::dunce::hang::worthless:
     
  18. JVROOM

    JVROOM Member

    Okay, the Walbro carb. Isn't quite ready, not quite available.

    Regarding rocksolid, Not sure why but for whatever reason, I cannot access their website for ordering. But I have been able to work with them via e-mail, no problems they are great. However the carburetor isn't quite available yet, tried to order one, was advised that it might be a week or so yet. But will get one soon. And that'll be great, able to get rid of junk.
     
  19. Fabian

    Fabian Well-Known Member

    Believe me, the moment my eyes saw the reed valve compatible Walbro style carburettor, my credit card just flew out of my wallet.
    The reason why you will have a short wait to get your carburettor is because i ordered mine yesterday and have a slightly shorter wait than you do :grin5:
    I suspect that the person who ordered before me has a slightly shorter wait than i do.

    I wouldn't say that the standard NT carby is junk, because (in my case) it's worked reliably for 40,000 kilometers, however it was a pain the backside when messing around with the jetting; constantly disassembling and reassembling after every jet change, then wasting time with test runs, followed by more disassembly and reassembly and test runs till the carburation was correct.
     
  20. JVROOM

    JVROOM Member

    Contacted Rocksolid yesterday, mail delivery where I live is horribly slow, so I asked about paying for expedited service, it took about 20 days for me to get the Reed valve kit. I was advised that this time they are machining up the adapter from the Reed valve to the carburetor. And at this time they do not have the carburetor is in stock, the shipment they were expecting has been delayed in Japan, and they're expecting to receive it around the middle of next week. Well I guess that'll give me some time to study up on the operation of to cycle motors.:detective:
     
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