If you don’t have an owners manual, consult your local (Suzuki, Yamaha, KTM etc) dealership and ask them.Ī lot of riders run their bikes at 40:1. My YZ 250 runs at 32:1 which is what’s written in the owners manual. The problem with veering away from the recommended fuel/oil ratio is the carburetor is set up for the right amount of petrol/oil/air mixture, so if you significantly alter this ratio you will need to change the jets and carby settings to suit. On the other hand, if you are just pottering around and spending most of your bikes time in the low to mid revs range, that extra oil is probably an overkill and not entirely needed. If you have skills like Ryan Dungey and you ride your bike at full noise most of the time you need the recommended petrol to oil mix to keep the piston and rings properly lubricated. Keep in mind the ratios the manufacturers recommend are for a high performance dirt bike that is designed to race at its full capacity. They are the ones who know the engine better than anyone else including your local mechanic. The safest, easiest and best answer is mix it at the ratio recommended by the manufacturer of your dirt bike. However, it’s essential for two bangers and it’s something you need to do correctly or you’ll damage or even destroy the engine.Ī lot of people seem confused about what ratios to mix the fuel and oil at. Mixing 2 stroke fuel ratios for dirt bikes (premix) can be a royal pain in the jaxi, and more annoying than having to listen to Britney Spears on the office radio. Either way, if you over fill, be ready for a hell of a smoke screen.As an Amazon Associate earns from qualifying purchases. I don't think over filling will do too much permanent damage to small 1 cyl push mower engines, but it's probably much worse for larger riding mower engines. I poured some out, runs like a champ with no smoke. I was able to see the level on the dipstick after it ran for a few minutes and some old left over oil mixed in, it was quite over filled. and of course the d-bag driving by in a prius was giving me a smug look. It started up on the first pull, and of course I was expecting some smoke from oil leaking into the cylinder head, but the smoke was so thick and was showing no signs of stopping. I had trouble seeing the full line on the dipstick, so I poured in a whole quart and thought too much oil was better than not enough. I poured out the old oil and poured in some new stuff before even starting it. The engine had been sitting crooked on my garage floor for a few weeks, so some oil had leaked into the piston and I had to pull the string without the spark plug a few times and oil sprayed everywhere. I swapped it with the briggs from the beer can thin john deere deck, and luckily the handle fit right on to the craftsman deck too, and the cable was exactly at the right length, so I had a new engine and a straight handle with the safety feature in tact. after using it for a couple of weeks, the tecrapseh threw a rod(I probably should've changed the oil). the handle was also a little bent, but the deck was heavy duty and it still served its purpose. The craftsman mower had a broken cable, so I jerry rigged it by removing the brake (which stops the motor) and connecting a toggle switch, even though it was a little more dangerous. this was obviously a P.O.S from walmart made with beer can thin sheet metal. the next day, i found a john deere push mower on the side of the road with a 3.5 horse briggs on it which appeared to be brand new and in mint condition, but when i brought it home, I noticed the right rear wheel was literally tearing off of the deck. I found a craftsman push mower with an eager 1 or tecumseh engine(i think they're made by the same company)down an alley one day. Apparently Briggs & Stratton make a seriously tough engine. Started on the 3rd pull (with the same gas, oil, and plug that were in it when we left it to sit in the elements). The new fancy mower tossed a rod a month after the 3 year warranty was up, so we grabbed the ol' beat up mower from where it had been abandoned. Pretty much fogged in our whole street before it cleared up.Īs a final note, we (several years later) retired that mower by parking it out back and just leaving it there. The effect of the overfill was to blow oil, both in liquid and smoke form, through the muffler like crazy for several minutes. This occurred after we realized it had no oil in it, which we finally figured out after a Summer of having it quit working and be seized up every 20 minutes (from overheating apparently, you couldn't budge the cord until it cooled off, then it would run fine again). My Dad once WAAAAY overfilled our cheap-o mower (Briggs & Stratton engine on it) due to filling the entire oil compartment when all you're supposed to do is wet the sponge in it. Long story to include a fairly short answer, but it's pretty amusing, so I'll give the whole story.
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