What could be wrong in Predator 212 minibike jerking when accelerating?

Mini Bike & Go-Kart Parts

#1
Hi minibike freaks

I have a minibike that starts jerking and I do not feel it goes the same speed it used to go before. When I stop at the sign and give throttle, I get a jerk and seems the bike front not keeping with the back.

I have a torque convertor, rejet, air filter and racing spark plug https://www.amazon.com/Autolite-AR3910X-Performance-Racing-Non-Resistor/dp/B000ET3X42?

I recently did:
1) Changed oil
2) Tightened the chain so it does not touch the frame. There is still slack
3) Clean the torque convertor from rubber dust
4) Clean the spark plug

Could any of the following cause? Not sure what should I try? Do I clean carb, buy a new spark plug , replace the belt for torque convertor?
 
Last edited:
#5
Hi minibike freaks

I have a minibike that starts jerking and I do not feel it goes the same speed it used to go before. When I stop at the sign and give throttle, I get a jerk and seems the bike front not keeping with the back.

I have a torque convertor, rejet, air filter and racing spark plug https://www.amazon.com/Autolite-AR3910X-Performance-Racing-Non-Resistor/dp/B000ET3X42?

I recently did:
1) Changed oil
2) Tightened the chain so it does not touch the frame. There is still slack
3) Clean the torque convertor from rubber dust
4) Clean the spark plug

Could any of the following cause? Not sure what should I try? Do I clean carb, buy a new spark plug , replace the belt for torque convertor?
Have you ever disassembled and done some preventative maintenance on the torque convertor? There are several good YouTube videos on this subject. You will need an aerosol can of dry moly lubricant. I clean ours every so often, lube the appropriate surfaces, and the tav runs great.
 

bruces

Active Member
#8
Loosen the chain a little ,and go through it link by link trying to flex the links with your fingers ,it’s possible some are seizing up and when they go through the sprockets they jerk a little instead of flowing smoothly .
 
#9
Hi minibike freaks

I have a minibike that starts jerking and I do not feel it goes the same speed it used to go before. When I stop at the sign and give throttle, I get a jerk and seems the bike front not keeping with the back.

I have a torque convertor, rejet, air filter and racing spark plug https://www.amazon.com/Autolite-AR3910X-Performance-Racing-Non-Resistor/dp/B000ET3X42?

I recently did:
1) Changed oil
2) Tightened the chain so it does not touch the frame. There is still slack
3) Clean the torque convertor from rubber dust
4) Clean the spark plug

Could any of the following cause? Not sure what should I try? Do I clean carb, buy a new spark plug , replace the belt for torque convertor?
I seem to be developing that issue, perhaps I got some graphite lube contamination despite wiping excess off, it seems issue started after the dry lube.
OR, my belt is wearing out a bit, it doesn't seem to 'grab' like it did before.
 
#10
Hi minibike freaks

I have a minibike that starts jerking and I do not feel it goes the same speed it used to go before. When I stop at the sign and give throttle, I get a jerk and seems the bike front not keeping with the back.

I have a torque convertor, rejet, air filter and racing spark plug https://www.amazon.com/Autolite-AR3910X-Performance-Racing-Non-Resistor/dp/B000ET3X42?

I recently did:
1) Changed oil
2) Tightened the chain so it does not touch the frame. There is still slack
3) Clean the torque convertor from rubber dust
4) Clean the spark plug

Could any of the following cause? Not sure what should I try? Do I clean carb, buy a new spark plug , replace the belt for torque convertor?
Try moving up to the next jet size.
My bike was sputtering, jerking, backfiring etc. a bigger jet solved that.My Coleman BT200X which is modified uses a .39.
 

Top