QuestionHi John,
Things are progressing. Here are a few things I did tonight.
1. Compression is 100psi
2. Removed muffler assembly and ran without it on. Big improvement.
3. I found a hole in the primer ball but I suspect this doesn't affect the operations since the unit will run with the primer ball dry.
4. Gap is set at 0.030in.
5. I can now get the high rev. It still runs pretty rough, however it is tougher to tell without the muffler on.
6. To get the High Rev I still need to have both screws open only about 1/4 to 1/2 turn.
7. I still can't get the unit to idle. I need to have the butterfly open about 1/4 to 1/2 way to keep it running.
8. I'm getting a fair bit of oil coming out of the exhaust. I suspect my oil/gas mix may be a little too rich.
Do you think the fuel pump valve could be out of calibration. I didn't get any type of gauge with the kit to set it.
Thanks for your help.
Regards,
Randy
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Followup To
Question -
I have a Homelite SX-135 Trimmer. I bought it used and it wouldn't run so I put a carb kit into it and it runs ok. However, I can't get the typical high RPM scream out of it and it won't idle (have to keep my hand on the trigger to keep it idleing).
I have the LS carb screw turned out approx 1 turn and the HS screw almost closed. This is the only way it will run. Spark plug is gapped at 0.055.
I've changed the fuel filter, complete carb kit and carb-block gasket. The muffler seems to have a fair bit of build up on the spark screen.
Any ideas?
Thanks,
Randy
Answer -
Hello Randy:
First Check the Exhaust Port for Carbon Blockage. Check the Muffler and Clean the Spark Arrestor Screen of Blockage. You should be Able to Set the HS and LS Screws at 1 1/2 Turns Out to Start The Engine. Rev the Engine and Turn the HS Screw In Until the Revs are Proper. **NOT TOO HIGH. IF YOU SET THE HS SCREW TO LEAN IT MAY CAUSE DAMAGE TO THE CYLINDER AND PISTON** Now Set the LS Screw so that when Reving the Engine from Idle to High Revs there is No Hesitation. Then Set the Idle Screw. If the Carburator Pump Needle is Set Correctly the Trimmer should Idle. If the Pump Needle is Set Wrong the Pump will Either Flood the Engine or it will Starve the Engine for Fuel. There is Usually a Gauge in the Rebuild Kit that is Used to Check the Pump Needle. If you Didnt Bend the Pump Arm you should be Ok. Hope this Helps. Let me know what Happens, Please. Thanks.
Good Luck
Respectfully
John
PS: Set the Plug to .030in. Thanks.
John
Answer Hello Randy:
From what you Described, I would Check the Fuel Pump Needle Valve. It sounds like it is Allowing too Much Fuel into the Carburator and Flooding the Engine. The Fuel Mixture Screws are too Lean for Normal Operation. Normally the HS and LS Screws are About 1 to 1 1/4 out when Adjusted for the Engine to Run and Idle Properly. Hope this Helps. Let me know what Happens, Please. Thanks.
Good Luck
Respectfully
John
