saw running rich

[jonsered 630]

having problems with my jonsered 630, intermittently running super rich. unable to get any rpms out of it when it happens, will still idle, but under full throttle will bog down, had recently put carb kit in it and it worked fine till yesterday, any ideas?

 

[jonsered 630]

is it possible that the coil could be bad?

 

[jonsered 630]

tried tuning it some more. runs good at idle, but very rich off idle

 

[barneyrb]

On my 670 the needle valve had worn badly and was letting it move too far thus allowing too much fuel. The wear was where it hooks on the moving lever and not in the seat area. The bottom of the notch (side towards the seat) had a very rounded shoulder and was not square like the top of the slot.

 

[jonsered 630]

i had installed new needle valve whaen i installed carb kit.

 

[jonsered 630]

is it possible that the welch plugs could be leaking?

 

[dugide]

is it possible that the welch plugs could be leaking?

where are you in mn., I have relatives there.

 

[cjcocn]

is it possible that the welch plugs could be leaking?

How much did you flatten them when installing them? I usually just flatten them (no sealant) and never had a problem.

 

[jonsered 630]

i just pounded them in.

 

[jonsered 630]

took carb apart agian, didnt see any problems, reinstalled carb, revs nice for a few times , then bogs down, fuel actually making muffler wet, any advice?

 

[cjcocn]

Did you set your metering valve?

 

[jonsered 630]

how do i set it?

 

[cjcocn]

how do i set it?

Depends on the carb.

First off, which type of carb is it? Tillotson? If so, which series? (hame and numbers should be on carb body)

Once we know which carb, we can go from there.

 

[jonsered 630]

the carb # is s218a223.

 

[qweesdraw]

This may help if it's a walbro carb.
http://www.wind-drifter.com/technical/WalbroServiceManual.pdf
Mark

 

[bama]

Depends on the carb.

First off, which type of carb is it? Tillotson? If so, which series? (hame and numbers should be on carb body)

Once we know which carb, we can go from there.

It should be a Tilly HS carb. Standard start-up settings are 1 turn out for each until saw is warmed up. Then adjust with tach or ear.

 

[jonsered 630]

low speed is at 1 1/4 out. idles fine, just bogs and dies on revving, i can turn high speed all the way in and it still runs rich, put carb off the 630 super and it runs great, both carbs are tillotsons

 

[TRI955]

There is a similar thread with a Shindaiwa 757 doing the same thing. I am interested to hear what the problem is. Coil?opcorn:

 

[jonsered 630]

i know its the carb. i swapped the one off the 630 super and it ran great.

 

[cjcocn]

how do i set it?

The metering lever on the Tillotson carbs should be set so that it is level with the carb housing.

If your saw runs rich enough so that fuel is coming out of the muffler then the lever may be set too high (too high = too much fuel; too low = too little fuel).