Lifan KPX Throttle Response / possible detonation

[JerryHawk250]

MotoJane, Another possibility is that the Valves may need adjusting. Even though it is a new bike, As many of us know on the forum. Most of these bikes come from the factory with valve gaps set to tight or even too loose.

[MotoJane]

I worked with my neighbor on doing a valve adjustment. He's a retired ASC mechanic. Wow, things went from bad to worse if that's possible. Something is wrong with this engine. The valves were tight but after doing the valve adjustment this thing click and clanks down the road. I wouldn't trust driving the bike more than 2 miles from my home. I'm at a loss. These bikes really don't have much in the way of adjustments. These noises in the engine are not normal, I've been riding bikes for over 30 years.

[JerryHawk250]

Originally Posted by MotoJane

I worked with my neighbor on doing a valve adjustment. He's a retired ASC mechanic. Wow, things went from bad to worse if that's possible. Something is wrong with this engine. The valves were tight but after doing the valve adjustment this thing click and clanks down the road. I wouldn't trust driving the bike more than 2 miles from my home. I'm at a loss. These bikes really don't have much in the way of adjustments. These noises in the engine are not normal, I've been riding bikes for over 30 years.

Do you have any video so we can hear? That would really help in diagnosing the problem.

[MotoJane]

Originally Posted by JerryHawk250

Do you have any video so we can hear? That would really help in diagnosing the problem.

Venom is in the building! They've called me! As for the sound, I've sent them a clip of it and they told me to stop riding the bike. They are working with the manufacture and we are on the road for a warranty issue. In the interest of the warranty and not wanting to hurt Lifan I'm not going to upload the video. I understand things happen, it's normally a one off, but this is the world not a video game.

[J4Fun]

Originally Posted by MotoJane

I worked with my neighbor on doing a valve adjustment. He's a retired ASC mechanic. Wow, things went from bad to worse if that's possible. Something is wrong with this engine. The valves were tight but after doing the valve adjustment this thing click and clanks down the road. I wouldn't trust driving the bike more than 2 miles from my home. I'm at a loss. These bikes really don't have much in the way of adjustments. These noises in the engine are not normal, I've been riding bikes for over 30 years.

With respect here, after adjusting the valves and it went from bad to worse, that’s pointing to the valves. We’re assuming that the engine was on the compression stroke when the valves were adjusted? Easy to to get things wrong here. Plenty of info. on how to adjust them here. Thinking out loud…

[MotoJane]

Originally Posted by J4Fun

With respect here, after adjusting the valves and it went from bad to worse, that’s pointing to the valves. We’re assuming that the engine was on the compression stroke when the valves were adjusted? Easy to to get things wrong here. Plenty of info. on how to adjust them here. Thinking out loud…

As I said I did have a real mechanic helping me with the adjustment. I agree something in the valves on this bike is seriously wrong and it isn't an adjustment. Maybe they aren't seating correctly or they are bent from the factory. I'm not sure but the way the sound of this engine something is seriously wrong.