sound of the engine

[300ec]

Hi all!
please, listen to the sound of the engine
this is a normal sound? I think the wrong sound at low revs
0:38 sec and 1:45

http://www.youtube.com/watch?v=vE-j6pc74cw

 

[Jakobi]

Hi all!
please, listen to the sound of the engine
this is a normal sound? I think the wrong sound at low revs
0:38 sec and 1:45

http://www.youtube.com/watch?v=vE-j6pc74cw

When you say low revs you mean as you come onto the throttle?? It just sounds really rich to me.

Has it only just started doing it? How many hours on the bike? Ever had a top end/rings? Does it feel super soft/weak power off the bottom? Like you have just lost a lot of grunt?

If it was running strong and just started doing this I'd start with the simple things. Pipe off, check the power valve is in the closed position (attachment 1) Use the kick starter to roll the piston over and check the rings for blow by (attachment 2). If the powervalve isn't in the right position report back and we'll go from there. Snap some pics if you can. They always help

 

[Biff]

Has it got bar mounted choke?
Mine stuck, ran rich

Biff

 

[Jakobi]

Has it got bar mounted choke?
Mine stuck, ran rich

Biff

Very good call! That choke will do it every time. Best $13 I spent on the bike was replacing it with a traditional plunger.

 

[300ec]

Has it got bar mounted choke?
Mine stuck, ran rich

Biff

it is not choke - I checked
thank you Biff)

 

[300ec]

1, Has it only just started doing it?
2, How many hours on the bike?
3, Ever had a top end/rings?
4, Does it feel super soft/weak power off the bottom?
5, Like you have just lost a lot of grunt?

If it was running strong and just started doing this I'd start with the simple things. Pipe off, check the power valve is in the closed position (attachment 1) Use the kick starter to roll the piston over and check the rings for blow by (attachment 2). If the powervalve isn't in the right position report back and we'll go from there. Snap some pics if you can. They always help

Thank you for your reply, Jacobi!
1, it already was when I bought the bike in the summer 2011
2, 10 - 15 hours after the change of the piston
3, I changed the piston and rings (and other parts), raised the needle one notch
4, I feel a loss power off the bottom
5, I'm sorry I do not understand what it means(((

now riding at -10 degrees Celsius (14 F) - everything works fine, the sound was gone, the bike pulls very well
the engine behaves badly when -20 degrees Celsius (-4F)

These are my jetting
Throttle valve/slide = 7
N1EF (2nd clip)
main jet 180
pilot jet 40
air screw setting - 2.5 turn out

I think I should change to smaller jets

sorry for my bad English(

 

[Jakobi]

Thank you for your reply, Jacobi!
1, it already was when I bought the bike in the summer 2011
2, 10 - 15 hours after the change of the piston
3, I changed the piston and rings (and other parts), raised the needle one notch
4, I feel a loss power off the bottom
5, I'm sorry I do not understand what it means((( (same as 4 - loss of grunt, loss of power/torque)

now riding at -10 degrees Celsius (14 F) - everything works fine, the sound was gone, the bike pulls very well
the engine behaves badly when -20 degrees Celsius (-4F)

These are my jetting
Throttle valve/slide = 7
N1EF (2nd clip)
main jet 180
pilot jet 40
air screw setting - 2.5 turn out

I think I should change to smaller jets

sorry for my bad English(

So from this last post I understand that the bike runs well right now, and most of the time. Its only when things get colder the bike lacks power just off idle and sounds flat/dull?

Does it feel the same as when you try to take off without warming the bike up properly? Have you tried pulling the choke on when its acting up to see if it helps. Does it do behave this way every time you get to -20C?

Did you try turning the Air Screw in to richen the pilot? As it gets colder the engine will want more fuel. If it only happens when its colder out it could be telling you something.

 

[Jakobi]

it is not choke - I checked
thank you Biff)

Checked at the time it was acting up?

 

[300ec]

1. So from this last post I understand that the bike runs well right now, and most of the time. Its only when things get colder the bike lacks power just off idle and sounds flat/dull?

2. Does it feel the same as when you try to take off without warming the bike up properly? Have you tried pulling the choke on when its acting up to see if it helps. Does it do behave this way every time you get to -20C?

3. Did you try turning the Air Screw in to richen the pilot? As it gets colder the engine will want more fuel. If it only happens when its colder out it could be telling you something.

1. Yes)
2. yes!
3. I tried to turn it counter-clockwise, not tried in a clockwise direction - it is my fault
Now try to do it in cold weather) I hope this does not happen))

Thank you, Jakobi!

 

[300ec]

Checked at the time it was acting up?

as soon as power was gone, I started to check all systems
checked the choke one of the first - opened and closed his

I hope everything will be OK)
Thanx again!

 

[Jakobi]

No damage done

Try going in (clockwise) on the pilot to richen the circuit up. I'd probably suggest going to a 42 for the temps you are dealing with. That should solve your off idle bogging. Another way to check is to whack the throttle open from idle quickly and see if the engine bogs for a seconds before responding.

The video sounded a bit rich on the needle to me, but I've got no experience jetting for negative temp at all so am a bit hesitant to make any suggestions. Maybe someone else with snow skills can chime in.