50ccs of fury 14 year olds get to school ride

why not just put a limit stop screw in the throttle where it runs great till 70

and not stress the motor or the kids mother?

not everything needs to produce that final erg prior to explosion
 
cxman said:
why not just put a limit stop screw in the throttle where it runs great till 70

and not stress the motor or the kids mother?

not everything needs to produce that final erg prior to explosion
Click to expand...

LOL I thought of that too. He's responsible enough to have the power and not use it unless he needs it. We live on a road that folks do 60MPH on even though it's a 45MPH limit. I'd like him to be able to do the 2 miles on that road before he gets to town at at least the speed limit. Right now he can do 35ish. My thoughts were to put the stop on first to make it rev right but he's ridden enough now that I am leaning more to letting it rev a bit more. Plus I ride it to go get movies and lotto tickets and would like it to be a little faster too. ;D

Edit: I think I'll do the stop first, then in a month or so we'll look at the other.
 
so to drudge up this thread, he's licensed, crashed it, healed and is riding again. I ported the intake which turned out to be a mistake. The cheapo carb is for a 4 stroke and the restriction in the intake was allowing it to run fine, my attempt to make it breath better made getting the jetting right impossible. So it runs along then stalls out and then hard to start etc. Broke down and grabbed a proper 2-stroke carb and adapter, will be cutting the bolt flange off the intake and attaching this, it should match up to the bike as it's for a Yamaha Zuma 50cc 2 stroke read valve engine very similar to the Hyosung. Issue I had until I found a shop I could ask was to attach a carb like this I have to cut off the flange and it's where the oil injection happens on the bike, didn't want to lose that to have to pre-mix. this carb has an injector port built in so good to keep it. I should be able to get this one to tune for reliable running.

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need to cut the manifold off where circled in green. need to leave it clean and ready for the coupler.

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Good luck with the new carb. Many years ago in Arkansas a 14 yo was supposed to be limited to 45 mph. As a result, we put throttle blocks on the throttle cable which allowed the slide to open only about 3/4 of the way. We weren't allowed to remove the block until the rider turned 16. But we were allowed to "tell" them how to remove it if their parents or older siblings wanted to ride it.
 
LOL. this thing had 3 restrictions from factory for rules here, all were removed about 10 mins after it left the dealer I am sure. I looked for them all and they were gone. one as a CDI wire, cut alreay, one was a plate under the manifold reducing it by half, gone too the 3rd is a washer that stops the variator from opening all the way it too was gone.
 
Update, got the manifold trimmed, carb mounted and promptly snapped the oil injection cable off the throttle while trying to re-adjust it. So swapped to pre-mix for now. Took 2 evenings of tuning but last night I got it to fire up, idle, then run down the road at a steady 40MPH, no heat seizes, revs smoother, just plain runs right for the first time since we bought it. only issue was I stuck the throttle slide wide open and had to kill it and pull over and fix it. I think I kept trying to get more out of it and cranked it a little too hard and jammed the slide. Need to check that out tonight but I think we got this thing ready for school this fall. I also realized I had stretched the fuel line a little too far so need to get some more and make a longer piece for the new carb inlet, it's of course in a totally different spot than the other one was,
 
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