The Green Industry's Resource Center

Old 06-11-2011, 01:56 PM
finneylawns finneylawns is offline
LawnSite Member
Join Date: Apr 2011
Location: Lake Jackson, Texas
Posts: 58
Stihl - Starting Problems

I have a FC 90 stick edger (6 months old) and FS 90r trimmer (10 months), and both of them are having similar starting issues.

The first start of the day both will start on the first or second pull (usually on the first), no pumping of the bulb and setting the throttle to the "Start" position, choke left open. They both fire off and reach "Starting" running power in about 2 seconds or less.

After that, it goes down hill. (if the machine is allowed to sit longer than 5 minutes or so, the amount of time between lawns)

I have tried a number of starting combinations, but the best combination I have found is to pump the bulb a 2 to 3 times, set the throttle to wide open, choke left open, and pull anywhere from 10 to 20 times. When it finally starts, it will start real slow and gradually increase to full speed taking about 10 to 15 seconds to reach full speed. While it is increasing in power, it smells like it is "flooded". I have tried to not pump the bulb to try and alleviate this "flooded" condition, but the machine is even harder to start.

Once they are running I have no issues with power, dying, or idling. They run great.

Things that I have done:

* Always used properly mixed fuel with 93 octane, and used the orange bottle of Stihl 2-cycle oil, but recently switched to the Gray bottle. (single guy operation)
* Have changed the Spark plug
* Have cleaned the machines with Seafoam and have run numerous tanks with Seafoam
* Adjusted the Idle up to just before the head or blade will start to turn on its own.

Things that I have not tried:

* Adjusting the High or Low needles
* Changing the air filter (Have blowed them out with an air compressor)

Marcus Finney - Owner
Finney Lawns
Follow my updates on Facebook
Reply With Quote
Old 06-11-2011, 10:35 PM
jkason jkason is offline
LawnSite Senior Member
Join Date: Jul 2005
Location: Derby, CT
Posts: 548
Take the carb off and remove the side of the carb away from the primer. There's an internal filter screen that regularly gets clogged with very fine dirt/dust.
Clean that out and you should be back to normal.
We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful;
We have been doing so much, for so long, with so little, that we are now qualified to do anything with nothing.

The difference between a Technician and a Mechanic - A Technician uses a book, the Mechanic uses his brain.
Reply With Quote

starting , stihl

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Layout Style:

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Grand View Media
All times are GMT -4. The time now is 09:30 PM.

Page generated in 0.06670 seconds with 10 queries