Stihl 045 carb bogs

[MS290man]

045 carb, freshly rebuilt with all new gaskets, screen, diaphragm, etc.. I completely disassembled the card, including the high and low needles, and sprayed carb cleaner through the adjustment holes so that I could see that both the high-speed and low-speed circuits appear to be clear. The saw will start and idle but I can't get rid of the bog in the transition between low and high; The saw hesitates then comes back. I did adjust the needle lever because the carburetor was flooding out. Adjusting the lever fixed that but I'm wondering if I adjusted it too far and it's starving for gas?

 

[backhoelover]

that or she needs some more adjusting

 

[Fish]

New needle?

 

[MS290man]

It got a new one in the rebuild

 

[bikemike]

Gasket and diaphragm are in the right spot? And status on the spark screen?

 

[Stump Shot]

There are multiple Low speed circuits in a row, is it possible the last one was missed and is plugged? Or was just simply re-contaminated, it happens sometimes even with our best efforts to clean everything.

 

[MS290man]

I thought I had 'em all cleaned out but maybe not. Thinking I should pull the Welch plug and re clean.

 

[Stump Shot]

I thought I had 'em all cleaned out but maybe not. Thinking I should pull the Welch plug and re clean.

Sometimes all it takes is one little bitty booger that was loosened up to let go and...

 

[Fish]

I would go back into the carb, set the needle lever to the correct height, then explore the carb {flooding} issue.

http://tillotson.ie/wp-content/uploads/2015/07/techinfo_hs_us.pdf

 

[MS290man]

I would go back into the carb, set the needle lever to the correct height, then explore the carb {flooding} issue.

http://tillotson.ie/wp-content/uploads/2015/07/techinfo_hs_us.pdf

That's the instructions I used, but I'll go back and check it again.....

 

[Stump Shot]

If you did try enriching the low speed needle to no avail then something else is going on. Is the gasket on the right side of the diaphragm? Spring OK? Lever right height? Fuel pump side pass a pressure test? Passages clear? Pretty much go back in and dot all the I's and cross all the T's, it's in there.

 

[bikemike]

If all else's fails the old holley 500 2 barrel carbs are easy to tune and might work for you

 

[MS290man]

Once again the hive mine comes through! I pulled the Welch plug and sure enough the back transfer port was blocked. Cleaned it out put a new plug in and the thing runs awesome! Thanks folks!

 

[Stump Shot]

Once again the hive mine comes through! I pulled the Welch plug and sure enough the back transfer port was blocked. Cleaned it out put a new plug in and the thing runs awesome! Thanks folks!

Love it when a plan comes together! Glad you were able to find it and get it going again.

 

[Ricardo Bolio]

Hi, this works for me every time. Set the low at 1 turn open. Warm up the engine then throttle up quicly, if the engine dies open 1/8 of a turn if its stalls close 1/8. Do this eather way until the transition from idel to full its quick and smooth.
Best regards.
STIHL MECHANIC.