Just spinn'n my wheels...and not going anywhere...

Discussion in 'Frame Mounted Engines' started by SMOKN_JOE, Jan 17, 2008.

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    SMOKN_JOE Guest

    I've read quite a few post on how to gain speed and I,ve tried quite a few also...I appear to be throwing good money after bad...No matter what I've done I just can't break the 25mph barrier (actully 22mph)...So I'm hoping that some on out there can give up a few suggestions....:???:

  2. gone_fishin

    gone_fishin Guest

    methinks you're needing to get the basic adjustments under control. your stock happy-time should be giving you an easy 30mph with that 40-tooth. so let's concentrate on basic tuning instead of "gaining speed"...

    read about the carburetor, mixture settings, spark gap and conditions...learn how to diagnose and fix an intake leak...if someone has time & is so inclined, maybe they'll toss a few links in here for a starting point...while you're waiting, go play with the search engine and see what you can come up with.

    HINT to all: every page of every section has relevant info, we've worked hard to make sure there's very little garbage to wade thru, so don't be afraid to go to the back pages when looking for help.

    keep us posted in this thread about progress or lack of, hang in there because it's worth it :cool:
  3. Alaskavan

    Alaskavan Guest

    How about a detailed description of of the engine's performance? Does it seem to bog down as you accelerate? Or does it accelerate smoothly from clutch engagement up to it's present max speed? When it does get to it's top speed, what does it sound like, is it winding out high? If you flip the choke on while it's running, will that kill the engine quickly?
  4. eltatertoto

    eltatertoto Guest

    glad to see some one is having the same issues as me lol i thought i was just fat or its 2 cold (190 lb) and 4 degrees today were gettin i think they caled it a polar gust or somthin gonna last til sat of next week :(
  5. eltatertoto

    eltatertoto Guest

    not to mean to butt in but for me all of the above, except on 1 bike it accel smooth and 1 it bogs down. i actually have a vid of it bogging, here's the link http://www.youtube.com/watch?v=mjFFJfRXdiA hopefilly that will be an example for others if this is like textbook or somthing.
    Last edited by a moderator: Jan 18, 2008
  6. Alaskavan

    Alaskavan Guest

    If it bogs down, my first thought would be that it may be an air/fuel mix problem.
  7. eltatertoto

    eltatertoto Guest

    right now ive got it 20-1 with a advance auto synthetic but my other bike doesnt bog and i use the same gas for it, and i THINK the pins are the same (highest setting stock) my minibike does this but it stops once it warms up, this one was running 10 min prior to this vid.
  8. Papasaun

    Papasaun Guest

    I'm thinking what Van is steering you to is an "Air" to "Fuel" mixture problem, such as an intake leak, either at the manifold to cylinder or carb to manifold. It seems like most builders have experienced problems in those areas.

    EL? 20 - 1 is fuel to oil mix. ( just point of information).

  9. Papasaun

    Papasaun Guest

    Smokin ?
    How far into the breakin are you? Are you using the original spark plug? I see by the pictures of your bike that you took time and care in your build.
    But I'm with Augie on this, I think you need to get back to the basic's and make sure its good to go from the start. setup and initial tuning, (fuel filter?). The screen on the shut off sometimes gets clogged and this could be a possible problem too.

  10. fetor56

    fetor56 Guest

    Last edited by a moderator: Jan 18, 2008
  11. eltatertoto

    eltatertoto Guest

    thanks to all, i think it just needs broken in, because i rode it like 10 mi today and it seems to me getting better but the darned clutch hates me, i cant stop without it dieing and i have played with the cable and flour nut endlessly mabey the clutch just needs broken in? because i have it where i have it (tight) and 1 notch looser and it doesnt catch at all...

    SMOKN_JOE Guest

    I just want to thank everyone for all the replies...So let me give everyone some background info...I can hope on the bike anytime of day, choke it, pop the clutch with in15ft. from where I started and it fires right up (I do need to reach down and back the choke off about 10% once it fires or it will die.) I ride around for a few minutes, then I can start to feel it bogging down ( Try to give it some gas and nothing) So when I reach that point I go ahead and back the choke all the way off, It cleans right up and it's good to go...Now that's it's running at a good temp, it will max out the 22mph within the length of a house (approx. 40-45ft. with the 44 tooth sprocket). It pulls really good all the way to 20mph nice and smooth, No bogging, surging, or vibration, Once i get to about 20mph I can start to feel vibration coming on, and at that point It feels like I've run out of either motor or gear...It just flattens out, almost like there's a governor...Now I'll tell you about some of the set up...I do run a fuel filter, and even during my riding there is a constate amount of fuel in the fuel line (clear hose)...I have "o"-ringed the carb. and while its sitting there I've sprayed it for vacuum leaks(natha)...I even went out for a good ride then came back in and took a plug reading (it was good...I'm not new to 2-strokes...but to be honest the simplisty of these motors is out of my realm a bit.) While I'm riding if I give it any choke at all, it starts to bog...I pulled the carb off to verify that my slide was opening all the way (Yep)...Now as for the RPM's it's turning, I don't know, It feels fine, I even borrowed the carb(with aircleaner) off a neighbor who bought his from SPOOKYTOOTH (80cc) and there was no difference...That when I decieded to try the 40 tooth sprocket (I did gain about 2mph)...Scince then I have replaced the plug and gapped it at .030 and set my needle at the 2nd notch down...And this is where I sit...Beautiful weather to ride in but just no pleasure in it feeling dissapointed in the hole thing...Oh and as for distance, approxamately 190-195 miles...
    Last edited by a moderator: Jan 18, 2008
  13. fetor56

    fetor56 Guest

    Really as a maximum speed(when it's run-in) u should be getting around 28MPH with very little vibration and smooth acceleration.
    Your "flattening out" seems to be mixture related...try setting the carby needle down one notch,that lifts the needle up in the carby slide and makes it run richer.Test ride,and if it improves set your needle down a further notch further riching-up your mixture...test ride.I use a plug gap of .025 but .02 also works great.
    Other than that it's a question of trial and error man.
    Last edited by a moderator: Jan 18, 2008
  14. srdavo

    srdavo Active Member

    I agree.....it sounds to me, like it's a break-in issue. most of my "happytimes" used about 10 to 12 tanks of fuel, before they smoothed out & sounded (& felt) comfortable at WOT.
    Listen to your engine...it might be telling you it's not ready to run 30+ mph yet.

    What type of 2-stroke oil are you using? Dino or Synthetic?

    I'd suggest a search on "break in", but the jury here is still out on that topic. :lol:

    IMO, I think it'll start coming to life after a few more tanks.....Patience & don't push it too hard yet.
    Last edited: Jan 18, 2008
  15. Irish John

    Irish John Guest

    Some power boost advice

    You can install the carb needle so it sits higher up by turning it upside down and you can make the inlet & exhaust gasket holes the same size as the holes themselves like they should have been if they made them properly.
    If you are quite deaf and don't mind annoying your neighbours you can drill 2 or 3 more holes in the exhaust baffles (this will give you noticeably more power by itself) or you can buy a little yoke that looks about the size of a large syringe that screws into the steel inlet pipe and forces the fuel that blows backwards back into the cylinder (this really boosts power) but unfortunately the bearings just can't cope with the extra power and the life of the engine will be shortened accordingly. I gave up doing these things when my garden started to fill up with stuffed engines and I just started slowing down and enjoying the ride. A custom made 36 tooth sprocket on the rear wheel is probably the best solution - you will pedal more uphill but on the level you can cruise at lower revs. When the engine eventually breaks as they all seem to do you will still have your sprocket wheel already installed and waiting to receive the next engine.
  16. I wish sometimes I can take my motoredbike closer to sea level to see what performance improvements I would gain. I'm actually quite happy with my 27 mph top speed,this happening only once with engine maxed out 44 tooth sprocket no less never will do that again Happy Time will never forgive me for that,always brings that up when we fight..but I like to say it maxes out at 23 mph. Then my happy time tells me it likes to cruise at around 15 mph.
    You can get a lower tooth sprocket but you lose in bottom end. This is my personal opinion but I like my 44 tooth for I actually need low end more than top end especially for that way cool and smooth little pedaling starting off that wow's the crowd.
    You're never gonna wow anyone on these bikes with top speed.
    You want top speed,find a huge hill,pull in the clutch and hold on! Then turn around and engine back up that hill.
    THAT,my friend,is how to wow the crowd.