No power above a certain rpm(MRT PRO 50CC)
Posted: Tue Jul 25, 2017 7:26 pm
Hey guy's,
I'm from Belgium, but I'm trying to figure out my problem with my bike.
So I was riding my bike(with restriction = 50km/h) and at some moment I felt that I was losing power.
But because I was going to replace the cylinder and piston when the parts arrived I just drove it a few more kilometers, and over those kilometer's it was losing more and more power.
So I put the bike in the garage and waited for the parts to arrive and apparently the piston and cylinder was as dead as they can be :'(
https://1drv.ms/i/s!AiVA6AaDGvQHg_wRMVicle9av-82Qg
https://1drv.ms/i/s!AiVA6AaDGvQHg_wTAB4gd9FrZHh8dg
So I replaced them both and a few other things :
-Spark plug
-Cylinder
-Piston
But after trying it it didn't changed anything at all, so I was trying to figure out the problem.
I first blamed the problem on myself not reajusting the carburetor after putting the new cylinder on it.
But I've tried jets from 60-120 and it would still not run fine at neither of those jets and I've been busy adjusting for 2 whole days, so it's not that I'm not taking time for it.
Because that didn't changed anything, I replaced the membrane, which eventually also did nothing(it gave it a little more power).
So eventually I decided to blame it on the ignition system and I changed the next items :
-CDI
-sparkplug
-spark wire(or how it's called)
Neither of those new parts changed something about the problem, so I was still blaming it on the ignition part, but now specifically on the stator or pickup.
So I measured the stators with a multimeter and compared it with the workshop manual from my bike.
(The link of the manual will be on the bottom of the post)
And I found out that the coil which is responsible for providing the voltage for the spark is 130 ohm's more than it is in the manual, so I'm almost sure this is the problem.
But I'm asking if I'm right because I'm not totally sure.
----------------
Here are the results from the coils in the stator :
(keep in mind it has 10-20% tolerance at 20°c)
White & Red : Manual = 130ohm
On my bike = 135ohm
White & Green : Manual = 700ohm
On my bike = 880ohm
-----------------
Links :
- Workshop manual AM6 = https://1drv.ms/b/s!AiVA6AaDGvQHg-o0B-JBL1e7ru885A
- Workshop manual MRT PRO 50CC = https://1drv.ms/b/s!AiVA6AaDGvQHg-oxIIS1PkBYfcX08w
Kind regards Alec_B
I'm from Belgium, but I'm trying to figure out my problem with my bike.
So I was riding my bike(with restriction = 50km/h) and at some moment I felt that I was losing power.
But because I was going to replace the cylinder and piston when the parts arrived I just drove it a few more kilometers, and over those kilometer's it was losing more and more power.
So I put the bike in the garage and waited for the parts to arrive and apparently the piston and cylinder was as dead as they can be :'(
https://1drv.ms/i/s!AiVA6AaDGvQHg_wRMVicle9av-82Qg
https://1drv.ms/i/s!AiVA6AaDGvQHg_wTAB4gd9FrZHh8dg
So I replaced them both and a few other things :
-Spark plug
-Cylinder
-Piston
But after trying it it didn't changed anything at all, so I was trying to figure out the problem.
I first blamed the problem on myself not reajusting the carburetor after putting the new cylinder on it.
But I've tried jets from 60-120 and it would still not run fine at neither of those jets and I've been busy adjusting for 2 whole days, so it's not that I'm not taking time for it.
Because that didn't changed anything, I replaced the membrane, which eventually also did nothing(it gave it a little more power).
So eventually I decided to blame it on the ignition system and I changed the next items :
-CDI
-sparkplug
-spark wire(or how it's called)
Neither of those new parts changed something about the problem, so I was still blaming it on the ignition part, but now specifically on the stator or pickup.
So I measured the stators with a multimeter and compared it with the workshop manual from my bike.
(The link of the manual will be on the bottom of the post)
And I found out that the coil which is responsible for providing the voltage for the spark is 130 ohm's more than it is in the manual, so I'm almost sure this is the problem.
But I'm asking if I'm right because I'm not totally sure.
----------------
Here are the results from the coils in the stator :
(keep in mind it has 10-20% tolerance at 20°c)
White & Red : Manual = 130ohm
On my bike = 135ohm
White & Green : Manual = 700ohm
On my bike = 880ohm
-----------------
Links :
- Workshop manual AM6 = https://1drv.ms/b/s!AiVA6AaDGvQHg-o0B-JBL1e7ru885A
- Workshop manual MRT PRO 50CC = https://1drv.ms/b/s!AiVA6AaDGvQHg-oxIIS1PkBYfcX08w
Kind regards Alec_B