Lean Condition uphill!

[periclesgsilva]

Hello guys! Trying to figure out how to solve my problem. Here my specs:

GasGas EC250 2011 2t
Pilot: 45
Main: 173
Air filter: Twin Air
Air bolt: 1 1/2
Gas ratio: 1,5%
Needle: default clip position

Well guys, my bike start easy even after a week inside garage. Everything ok, good power, come up in 3rd gear very easy.
The problem? When i enter in a long way uphill or a place where i need to use the throttle the engine, after some minutes, start to rev up, and become lean. I mean, when i need to call the "monster" the bike appear to "knock" the piston, lean, like the air-mixture was with so much air.
Checked: pilot 40 to 45 - Rubber who connect the carb to the vforce changed - o-rings from exhaust changed - carb cleaned - radiators with Motocool.
Maybe the inginition side crank seal? An air leak? Flow level? Checked the 16mm for PWK 38, but appear to be less gas than actual setting inside carb.
Thanks and sorry for my bad english. Cheers!

 

[n_green]

Hello guys! Trying to figure out how to solve my problem. Here my specs:

GasGas EC250 2011 2t
Pilot: 45
Main: 173
Air filter: Twin Air
Air bolt: 1 1/2
Gas ratio: 1,5%
Needle: default clip position

Well guys, my bike start easy even after a week inside garage. Everything ok, good power, come up in 3rd gear very easy.
The problem? When i enter in a long way uphill or a place where i need to use the throttle the engine, after some minutes, start to rev up, and become lean. I mean, when i need to call the "monster" the bike appear to "knock" the piston, lean, like the air-mixture was with so much air.
Checked: pilot 40 to 45 - Rubber who connect the carb to the vforce changed - o-rings from exhaust changed - carb cleaned - radiators with Motocool.
Maybe the inginition side crank seal? An air leak? Flow level? Checked the 16mm for PWK 38, but appear to be less gas than actual setting inside carb.
Thanks and sorry for my bad english. Cheers!

Sounds like your float level is see too low. If it is a 2011 bike you most likely have the AS2 carb (flat top cap that is held on with two screws/allen head bolts and has a shallower carb bowl. These carbs require a float height of approx 8.5mm.

 

[periclesgsilva]

Sounds like your float level is see too low. If it is a 2011 bike you most likely have the AS2 carb (flat top cap that is held on with two screws/allen head bolts and has a shallower carb bowl. These carbs require a float height of approx 8.5mm.

That's right! This is my carb. I will clean my bike in a few moments and posts some pictures of my float/carb. Thanks for the fast answer and help my friend!

 

[Jakobi]

And a 172/175 main is on the lean side of things for sustained WOT runs on a 250. You also didn't mention which needle and clip position, as well as where you are working throttle wise when its occurring (ie half throttle? 3/4 throttle?)

 

[periclesgsilva]

Jakobi the clip is on the middle position. I will check the needle model soon I finish the cleaning process. Also I feel the leaning process in 1/3 of throttle. I never pass this when I feel she is lean. Some minutes and I will check needle and post some pictures. Thanks for the answer and help my friend.

 

[periclesgsilva]

Hello guys! Sorry for delay.
My needle: N1EF
Carb: PWM 38
Reeds: Vforce 3
The fact: always when i hold the throttle for example, i feel the lean condition. After some "hard condition" when you need to feed the monster, the idle grows up like "Tan, tan, tan, tan". Appears to me a fuel problem.
Another fact, i never can set my idle perfect. Stay at 600rpm (an example), after 30 seconds, downs to 100rpm and engine stop.
Cheers!

 

[Jakobi]

Stock needle is no good.

Have a read of my thread for my setup of 2013 250R. It includes going through the carb and some jetting specs. http://www.gasgasrider.org/forum/showthread.php?t=16254

Setting float correctly - http://www.gasgasrider.org/forum/showthread.php?t=11886

 

[periclesgsilva]

I will try to adjust the float again.
Another thing, Jakobi. After some pictures look on the internet, i saw some difference on the wire on the float needle. Mine looks like a paper clip, inflicting some pressure in the plate of the needle. This is right? Some job quick draw (thanks Galaxy Note). The others appear to be plain.
Take a look, please.

 

[Jakobi]

From memory the wire clip just floats over the tab and the needle floats between the seat. When setting the float height the carb needs to be tipped over to where the needle rests against the seat, but before the jet depresses.

 

[periclesgsilva]

Tonight i will take a look on this one.
Another quick question: you are a motorcycle mechanic, Jakobi? I ask because i saw some pictures. All dismounted and mounted again.
Cheers!

 

[Zman]

From the first photo the floats look like they might be slightly off, where one is a little lower than the other. Make sure they are both at the same level.

 

[Jakobi]

I'm not a mechanic by trade, but I do all my own work on my bikes with exception to pressing/truing cranks.

 

[swazi_matt]

I will try to adjust the float again.
Another thing, Jakobi. After some pictures look on the internet, i saw some difference on the wire on the float needle. Mine looks like a paper clip, inflicting some pressure in the plate of the needle. This is right? Some job quick draw (thanks Galaxy Note). The others appear to be plain.
Take a look, please.

The wire should be flat on top, not bending down like the one you drew

 

[Jakobi]

I've got to work over a mates carb on his TE300 in the next couple days. Let me know if you need any pics of anything.

 

[periclesgsilva]

Interesting!

Guys, another interesting fact: if i put my GG on my garage ramp (little inclined) my idle stay ok. If i put the GG on a plain state, no idle. I mean, the same idle bolt status differ when i put on ramp or plain. Float level yet?

 

[motopsycho87]

Does sound like float height, but also, check your fuel tank breather pipe for correct orientation (take it off, you should be able to suck through from fuel tank side). Also, is a fuel filter fitted? Is it clogged?

 

[periclesgsilva]

Psycho, no fuel filter. Fuel breath ok. I can blow air inside the tank but can't suck (in gas cover). Try'ed without gas cover too. I'm really frustrated with this problem. Also, i ordered a new crank seal (ignition side) to check.

 

[periclesgsilva]

Well guys. Just to finish the epopeia! It was the crank seal. Ignition side. After changing the bike runs perfect. Thanks for all efforts to help me. Cheers and hugs from Brazil.

 

[Moto7man]

Tonight i will take a look on this one.
Another quick question: you are a motorcycle mechanic, Jakobi? I ask because i saw some pictures. All dismounted and mounted again.
Cheers!

Where are you from?

 

[periclesgsilva]

Where are you from?

From Brazil.