This ensures you don’t stall (or flood) the engine. You don’t apply any gas to the throttle until the unit has been running for 6-10 seconds. The starting order involves verifying the choke setting, priming the bulb, and then pulling the starter cord. It’s not necessarily difficult per se – just tedious. OK, I’m being generous… you’ll pull on it almost a dozen times before it starts. It takes a few more pulls than we were used to. The biggest challenge you are likely to encounter when using this tool is starting it up. The oil needs to be changed after every 25 hours of use. That’s a shame as this takes up much more room than hanging it from a double hook with the engine side up (two-cycle engines can be stored in this way since the oils and gas are mixed together and sealed within the engine). As a result, the only “safe” storage position for this tool is lying horizontally on the ground, properly oriented. Both produced leakage from the carburetor. We did try hanging it vertically with both the engine and blade sides up. We didn’t find the unit to leak all that much oil during our use, provided we kept it horizontal during storage. It’s important to not overfill the oil, so be careful and use a funnel (a paper one is provided for first use). Checking it is just a matter of cleaning off the dipstick and then making certain the oil falls within the hatched area of the stick. The trimmer takes 10W-30 oil and holds 75mL of lubricant (oil) when full. It should be checked with the trimmer placed horizontally on the ground. ![]() The cap also serves as a dipstick to let you know the oil level. On the rear of the trimmer, you’ll find the recessed oil cap. ![]() Reviewer’s Note: See our article on 2-cycle vs 4-cycle engines. Higher quality trimmers tend to have the starter rope anchored to the back of the unit so that it can make use of a full crankshaft that is supported by a bearing on either side. This is a half-crank design with only a single bearing on the crankshaft. Just in front of the choke is the starter grip and rope which you will undoubtedly become very familiar with when using this tool. The bulb looked to be well-made and is a device you will expect to replace after several years due to the fuel taking its toll on the synthetic material. On the left side, just above the tank, you’ll see the choke lever and priming bulb. You simply twist the accessory knob to loosen it up, depress the spring-loaded coupler mechanism and remove and replace the Expand-It accessory. Accessories are changed quite easily and the process is completely tool-less. We actually used an old Edger attachment from circa 1998 that fit perfectly onto the shaft and allowed us to edge our lawn after we had made quick work of the weed-whacking. The Extended Reach Trimmer attachment (RY15522) is nearly identical to the one included with the 4 Cycle Straight Shaft trimmer (except that its shaft is yellow to match the Expand-It line of trimmers). Currently, the company has 7 attachments available: The system works with Ryobi’s Expand-It system whereby the single 4-cycle body can be used with multiple attachments. We prefer straight as it works better for taller people and facilitates cutting underneath decks and other tight paces. The system is available as a straight or curved shaft. ![]() It reminds us of the plastic panels found on a cool motocross bike. The Ryobi 4 cycle trimmer is a beautiful-looking product. The 4-cycle Straight Trimmer comes with just the string trimmer attachment, but does include both a bump head and a pro-style head that facilitates easy string replacement and will handle larger diameter string (anything from 0.095 to 0.105 in.) Using larger diameter string will make your job easier and we highly recommend going for the largest you can find that fits the Line In Pro Cut II string head.Įditor’s Note: Check out our best gas string trimmer article for our top recommendations. It also works with Ryobi’s Expand-it line of attachments – which are even backward compatible with products I bought over 10 years ago. It’s a “green” product (in more ways than one) that indeed delivers less fuss when fueling since you don’t need to pre-mix your oil and gas. ![]() The Ryobi 4 cycle trimmer RY34440 promises, among other things, quieter operation and greater fuel efficiency.
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