Bike isn't running properly

Zac

Active Member
Joined
Dec 19, 2021
Messages
167
So on Wednesday, I did a top speed run on my bike. I was riding it around before, and there seemed to be no problems. I then went WOT and at top speed, the bike just shut off. I Have a pull start on it, and the string was loose, no recoil.

When I got my bike home and took off the pull start, it was mostly ok other than some e clips breaking that held in some knobs for the pull start. Didn't seem like too big of a problem.

I replaced the eclips and started it up, and it took a couple extra pulls to start, but it idled way lower. It revved up just fine though. I went onto the road to drive it, but it was really slow. No power at all, topped out at like 10mph on a flat. Because the pull start mounts over the magneto, I feel that there's a possibility that something went wrong around that area, maybe with the CDI or magneto or the magnet itself, but I honestly don't know what exactly went wrong.

There are no air leaks, it has compression and gaskets are good. Any help or suggestions? I have an nhk br6hs, and just the standard Chinese cdi and magneto that comes with most engine kits.
 

Zac

Active Member
Joined
Dec 19, 2021
Messages
167
I recovered1 eclip, the other idk. I thought it got shredded up by the magneto because when I took the cover off, there were metal shavings
 

Zac

Active Member
Joined
Dec 19, 2021
Messages
167
IG it doesn't hurt to double check. Would it have gotten behind the magneto? I did a check with a flashlight and didn't see anything
 

Wrench

Well-Known Member
Joined
Nov 14, 2018
Messages
5,006
I recovered1 eclip, the other idk. I thought it got shredded up by the magneto because when I took the cover off, there were metal shavings
I think that's a clue. Better clean it up and check it good
 

DieselTech

Well-Known Member
Joined
Sep 18, 2021
Messages
4,002
IG it doesn't hurt to double check. Would it have gotten behind the magneto? I did a check with a flashlight and didn't see anything
I bet it's trying to shear the key off in the magnet. Therefore your timing might be off now.
 

Zac

Active Member
Joined
Dec 19, 2021
Messages
167
I just watched a video on it, and t explains that same thing. This sucks
 

DieselTech

Well-Known Member
Joined
Sep 18, 2021
Messages
4,002
I bet it's trying to shear the key off in the magnet. Therefore your timing might be off now.
That's the only bad thing I see with a pull start on 2stroke, it mounts over the magneto rotor & could cause timing issues if it trys to shear magneto rotor key that's in the crankshaft snout.
 
Top