vanilla ice wrote:I'm not sure about the reasoning in this particular case, but I do know on two strokes the con rods do not unbolt. They are one piece. You need to press apart the crankshaft to replace/remove them. PITA.
vanilla ice wrote:Nice one on the sensors! Any chance you can give step by step details and macro pics on the job?
vanilla ice wrote:Ah thanks, missed that thread. The old yamaha 50cc scooter in my drive way is calling my visa card.. must resist!
spdas wrote:Aloha, and great work on the crankshaft attachment to the motor. I was wondering how you were going to do it! I may start a build myself if i get some spare time. For higher top speed I would be looking at getting a set of gears for the Diff, (Maybe a 7:1) .... that is what is needed for a gas 'ped if you need to get out of the 55-60 mph range and into the 80+ range.
Also a larger diameter Variator and driven face like a Kitaco, maybe as well as the heaviest weights. Try a slightly longer and wider belt so the belt does not go all the way down on the variator boss. (Machine the variator and driven face to close really tight) and with the wider/longer belt your belt should climb all the way out past the variator BEFORE you run out of pulley on the clutch side.) I am not sure what diameter weights you have (yamaha size?) if so, try Honda as they are a bit larger diameter and will close the variator halves closer without falling out. Also using an FRP ramp will help hold steady rpms vs pulley openings. Do you have a moped breaker nearby that would have an assortment of bits? In the southeast, (Maidstone?) try Chris at Scooters-r-us.
ryan_lirui wrote:I've been thinking a lot about this cvt set up of yours gwy and I was thinking what might be a big help to you is if you change up the type of throttle you're using. As far I as I know, you're using a speed based throttle, which is good for a sort of direct drive set up like most electric bikes, but might not be ideal for your application.
My interpretation of a cvt in a normal ICE engine application is that it juggles the ratio on the pulleys to always keep the motor in the optimum rpm range of your motor. When engine rpm increases, ideally those rollers fan out to adjust the pulley to a ratio that is best suited for the motor at that point in its rpm range. As a driver, you scale the amount of power you want to put through the system with the motor and the CVT translates that into wheel speed.
Currently what you're doing is a bit counter-intuitive, you're adjusting the rpm range of your motor directly and then letting the pulleys juggle around faster or slower according to the amount of rpm your motor's running at. This is probably why you're pulling less current than you did before using a CVT when you try to accelerate. What I think would be ideal is if you use a current-based throttle so that you're directly adjusting how much power you want to put through the system and the CVT be used at its greatest potential.
This way, you could optimize your set up so that you can focus more on a higher top speed and not worry as much about getting it to engage properly at lower rpm because you'll be able to crank the throttle and get full amperage out of the motor to get it up to speed.
Fechter's Current-Based Throttle: http://endless-sphere.com/forums/viewto ... d+throttle
I'm not claiming to be the expert, but please give it some thought. If someone can spot the error in my logic here then please do so.
vanilla ice wrote:In my experience looking for cheap old scooters, it is way easier to find the small ones. Hardly ever see the big ones for cheap. I can see how its smarter to go big if you're paying more for a new or late model used one though.
maydaverave wrote:a 150 cc scoot doesn't weigh much more or cost much more than a 50 cc scoot and it is built and geared for higher speeds.
dbaker wrote:Great job on the scoot, Gwhy?! I can see now where you are using your external sensors. 60MPH!
Are you using your 6fet controllers on this?
(I am sooo anticipating my bike with that motor & this thread has been 100% encouragment)
I am totaly impressed with this builds success.
katou wrote:Since it is working so well now, could you time it from zero to 60? I think that most here would be familiar with the common times and what they feel like, it would really help me understand the performance level.
I love reading about this project. If you ever take it apart to tune/repair it, it would make a great picture essay.
It's got me looking at scooters very differently...