Bad throttle response 3W 106 CS

[sapca]

Hi,

The throttle response from my 3W 106 CS is verry slow
The engine starts verry well.
The idle and full throttle is great,bud the response from idle to full throttle is slow.
I use Pefa cans,Aspe fuel and a verry quick throttle servo ( Fut 9354 )
The prop is a menz 28/8.
The engine has 15 l of fuel burned.
Mannifolds 19 cm long.

I have turned the needles in almost all positions that is possible.

Help !!!

Regards

Sapca

[Vic3D]

	Quote: Originally Posted by sapca
	Hi, The throttle response from my 3W 106 CS is verry slow The engine starts verry well. The idle and full throttle is great,bud the response from idle to full throttle is slow. I use Pefa cans,Aspe fuel and a verry quick throttle servo ( Fut 9354 ) The prop is a menz 28/8. The engine has 15 l of fuel burned. Mannifolds 19 cm long. I have turned the needles in almost all positions that is possible. Help !!! Regards Sapca

Sounds to me like your low end needle is not set right, or you got some junk inside your carb. Check your carb screen inside the carb to see if there's anything blocking the fuel in there.

If it's clean, you have to work on your low end needle. 1 and a 1/2 turns out is a good starting point. Test your transition, if it's hesitant, then you're too lean, open it up a bit. If it burbles all the way up, then you're rich, close it a little. Once you reach a rough OK transition, then start doing fine adjustments on the needle as they get pretty sensitive. Good luck!

Vic

[plane]

Set the low needle first and get that out of the way. Then start leaning the hi needle. What is happening is air is drawing through the hi speed circuit too soon. Keith Baker explains this very well in the BME 115 thread on RCU. Keep leaning the hi needle until your transition is perfect. Don't worry about over leaning the hi because as long as your midrange is loading up your hi needle is still too far open.

[sapca]

Hi Vic,

The engine don't hesitant and not burbles.

He goes smooth from idle to full throttle,bud not fast enough.

When I lean the idle for 1/8 ,then he hasitant.

Is it possible that the muffer make him so lazy ???

The pefa's are for 75 cc

It feels like I have put -70% of expo on my throttle curve

Regards

Sapca

[plaster93]

Sapca,
If your using the PEFA "M" cannisters that is your problem, as I have the same problem. I don't think the "M" can has enough volume to work properly with the 106. The 3W website recommends the PEFA "MS" or "L" cannister. More than likely you will have better throttle transition with a larger can.

[Bunky F. Knuckle]

Check you throttle ATV's. We had this discussion in Celina yesterday. The closer you get to 100/100 the better off you are. If you set something up say, 20% low stick, 140 high stick, then yes, you'll have issues with bad response. Check that out, and then start playing with needles.

[rcign]

An engine with electronic ignition will bog from idle if the low needle is too rich...The ignition advances with change in rpm, not the other way around, it can't magically tell when or how much advance it needs...If the low is too rich the acceleration of the crank will be slow and advance will lag, slow response...
If the high needle is not set first it could be too lean in the first place, then the low has to be set rich to compensate...Best to start at LEAST 1 1/2 open on both, set the high for max rpm first, then set the low...
Don't believe it ? Close the high all the way, then try to set the low...You WILL understand.....
Most EI is at full advance at 4000 rpm.....

[thewrap]

It can sometimes be that it's not drawing fuel correctly. You could have Airbubbles or like Vic said it's in your needle valve.

[sapca]

Hi,

I have cleaned the carb and ordered a set of BMB canisters ( competition X 70 )
I called 3W and they told me that the muffers can be to small.

I will see tomorrow that the other muffers makes difference.

I will let you know.

I have no airbubbles in the fuelline,and I think there is notting whrong with the needle valve.

I the manual from tillotson HS carb they whrite this:

ENGINE
WILL NOT
ACCELERATE:
Incorrect setting on diaphragm lever==solution === Reset

How can I reset the diaphragm ???

Regards

Sapca

[rcign]

.

[DesertHucker]

	Quote: Originally Posted by sapca
	Hi, The throttle response from my 3W 106 CS is verry slow The engine starts verry well. The idle and full throttle is great,bud the response from idle to full throttle is slow. I use Pefa cans,Aspe fuel and a verry quick throttle servo ( Fut 9354 ) The prop is a menz 28/8. The engine has 15 l of fuel burned. Mannifolds 19 cm long. I have turned the needles in almost all positions that is possible. Help !!! Regards Sapca

28x8 prop what revs are you getting.
I have the 106cs 28x10 mejzlic 7000rpm.
sure you are not over revving the engine, these produce their power at low revs 5800-6400 i was told by 3W.
The small cans will choke your engine i use the 3w cans huge volume in side.
I was warned about using small cans could destroy the engine. and Void warranty.
I had them in an extra 140mm long headers now in the yak 235mm headers no difference in performance.

[sapca]

Hi dudes,

I have found the problem

I have take off the air intake horn, and now the engine has a verry agressif throttle response.

I see ,the hole in the horn is mutch smaler than the intake of the carb,so I think he did not gets the air he needed.

Regards

Sapca

[plaster93]

I heard that you can turn the snokel around to face the prop and it will actually increase your rpms, as it is funneling the air into the intake.

[kjkflying]

sounds like it might be to lean on the high needle.i have the same engine and it was doing the same thing.after riching up the high end it has great responce and higher rpms.