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RE: MTD trimmer YM1500, 31 cc motor. Won't run without the check lever near full on. Fresh gas, mixed 1 gal to 3.2 oz 2-cycle oil. Found & tightened loosescrew on throttle butterfly valve, and loose screw on reed valve retainer. Replaced a faulty magneto module. Air filter & spark arrester screen are clean. Carb insides LOOK clean. Is there any adjustment other than the idle speed screw? Carb # 753-47807.

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Most carbs have a H (running) and L (idle) mixture screws on them, but the newer ones are getting away from that somehwhat and some aren't adjustable. I am including a tech guide for carb adjustment for a Zama carb. All diaghram carbs are similar.
http://www.zamacarb.com/tipspage.html

Posted on Aug 29, 2010

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I have 1/2 can of 8 oz oil per 1 gal gas. I need to change it to 2.6 oz oil to 1 gal for a weedeater. How much gas should I add to what I have to get the proper mix of 2.6 oz to 1 gal gas?


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What is the problem when my 27cc craftsman weed wacker starts but doesnt stay running


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What type of fuel mixture do I use for 20760 Homelite gas trimmer?


Most likely not the answer you are looking for but here is a shot:

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When mixed at this ratio it provides MORE than adequate engine protection for ALL 2-Cycle engines, including those that run in 40, and 30:1 ratios.

I mix one 2-cycle tank to label instructions on the Echo oil for 50:1. It handily runs in my Echo chainsaws, non-echo trimmer, Poulan Pro leaf blower, etc. They all run different ratios, but THRIVE on the Echo mix without as much oily residue and smoke to boot!

CAUTION: I do not know of ANY OTHER MAKE of 2-cycle oil that CAN DO THIS *SAFELY*.

Remember:

Always mix your 2-cycle fuel starting with *fresh* gas.

Mix only that which you can use in 30 days.

Use 89 Octane fuel to make your mix in small piston 2-cycle engines.

Clean and re-oil intake filters @ every 10 hrs. operation time. Check and re-gap your plug when you service your filter!

DRAIN unused fuel from tank back into gas mix container. Restart and let engine idle to run any remaining fuel out of engine and carb. Storing fuel in ANY 2-cycle longer than two weeks is going to gum them up and nothing short of a carb rebuild will get them sputtering back to life again!

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