Honda ATC 70 throttle problem
OK My 70 cc... My first mini bike Z50...14 or 15 years old.. fun days ! Thanks for the reminder son![img]i/expressions/face-icon-small-smile.gif[/img]
70cc is the offspring of the early 1960s- s65cc step thru scooter, same engine outfited.
Let's see if this helps us come to a solution
Put the choke lever in partially choked position just a little until it starts to sound like it is being choked out.
Then back off a little. Leave the choke in this position
Let's see if this makes some kind of a difference...
Raise the trottle ever so slightly...
If it revs a little then flatens out or breaks up I would:
Check Air cleaner to see if it is clean or the element is missing or the air cleaner tube has fallen off or has some air gap... torn ripped or just missing.
Another part is that the metering needle in the center of the trottle slider has fallen off its J-C clip.
These mini engines smaller than the 90cc can not take a direct rush of air into the carb!
For some reason it does not create enough of negative air presure across the main jet vent where the metering needle rides.
Also when the slide is moving towards the open position and does not lift that needle it prohibits any fuel mixture to be created.
Main jet may be clogged!
At this point I would recommend you personally speak to a Honda Dealer close by!
You may inspire the owner with the knowledge that you have just obtained here and he may need someone in the shop to clean up the showroom or maybe start you into working on bikes, which happened to be back in the days!
If you have trouble understanding this have your dad or mom explain what I have transcripted here!