Please help!! Need bike for work

[Chrisgoosen]

Hi I use my motorized bike (80cc from china to be specific) to and from work. Long story short it starts up just fine runs great for about 15-16 mins then starts jerking a bit then begins to lose power and then get is fine for a sec and loses power and dies. And this happens every single time ride at the EXACT same place on the route both ways to the point I pass a certain spot I just turn it off and pedal. If I don't turn it off 20-40 seconds later it happens. I have set my timer on my odometer as well to be sure I wasn't just imagining it, it's been going on for 7 months

 

[Baconator101]

This has been happening for 7 months? WTF? There's trolls and then there's this.

 

[Chrisgoosen]

I have brought it to multiple mechanics and all r like ok should be good ( very small town and only motorized bike mechanic is a crazy old guy who only sounds like he knows what he is doing and want some pretty stupid fees .... I.E wanted $250 just to shorten my chain) and nope same thing every time. I thought MAYBE it was a faulty motor or something but this is the second motorized bike this is happening with hence the PLEASE HELP

 

[Chrisgoosen]

So I started recording at the 10 min mark on my run today

 

[crassius]

I'd first check the gas tank is venting properly by riding without the cap tight to see if that helps. Then I'd be looking at things that could overheat after a certain amount of time.

 

[Frankenstein]

Hey now that could be it, if he was running consistently enough performance wise a part could heat up in the electrical department and cut out.

I'm not convinced this is a serious person yet though so I'll just watch lol...

 

[Chrisgoosen]

I pulled the cap off 2 rides ago and it's seemed to go smoother but then continued dying. I have been wondering about the overheating as while as after I shut it off then after 10 min runs fine again. I will say one of the mechanics took out my round column bolt as it came loose in the motor and filed itself down. The mechanic said I didn't need a new one as it is where a pull starter would connect too wether that's true or not I haven't been able to find out. As for the over heating of that is the case then I'm wondering y it's over heating so fast I don't feel any extra friction or resistance and I do keep it well lubed. I opened the header and the piston is completely dry no oil or lube not sure if that's normal and I'm running it at 16:1 which is what the instructions say ( during break in and after both 16:1 which I feel is weird)

 

[Chrisgoosen]

Trust me I'm serious I took a video I will post on YouTube later and send a link. This is no prank.

 

[gary55]

I have just experienced the third bad cdi in a row. all out of brand new pk80 engine kits. They do not go bad till after a few minutes of running. They do so gradually and mimic something causing a rich condition. They spark tests good. If I didn't have a stock of cdi's I ordered from another vendor, and read a post by crassius on a cdi issue he was having earlier I would probably still be scratching my head.

 

[Chrisgoosen]

Oh yeah that could be it. Sounds like it makes sense and y the mechanics out here can figure it out. Do u recommend any specific place to order from or any place should be fine?