Hi,

So the engine won't start, the 2-3 last time it started I needed to give it full throttle to start it, like the choke was doing nothing.
Then this time, the engine won't start at all.

I find the spark on the plug a little on the weak side, juste a small purple lightning.
I removed the carburator and check the bowl, they are all spotless, I also checked the idle jet and it looked really good and cleaned them.

The engine only does some small "pop" time to time and nothing else.

- Brand new spark plug CR9EH-9
- Battery is full
- I changed the R/R not long ago because the voltage was going over 15V, maybe re-test the old one even tho it working on the new one ?
- It smell gas but when I remove the plug they are not full of fuel/wet, just smell the fuel.
- Even if I put a very small amount of fuel in each nothing change at all
- There is fuel in the bowl
- I also checked the sub filter & main filter
- Note that the engine is used off-road only

I want to know what to check next, the valve clearance or timing maybe ?

Thanks !

 

It should start with full choke but no throttle. You may want start there.
when you removed the idle screws they should have been between 2.25 and 2.5 turns out

 

Oups I edited my post, I mean I cleaned the "Idle jet".

I am thinking that the Stator does not provite enough power, I will check it tomorrow with a multimeter

What do you mean by Idle screws? The on on each carb? Where is it ?

Thanks !

 

The fuel/air mixture screw. It's near the fuel bowl.

 

Can it change over time like that? Because everything was working fine, and then it started getting worste and worste then this.

 

If the jets are clogged, yes

 

I follow this for testing the stator :

The strange thing is that I have 3 yellow wire coming from it, but they have continuity between all of them, so I guess my stator is bad then ?

 

It sounds like it could definitely be questionable.

 

It's repaired ! I found the problem!

I did another post, just to try to help more people:

https://cbrforum.com/forum/cbr-600f3...1/#post1333905