I will assume the user knows to replace the spark plug regularly, to use fresh fuel, and to replace or clean the air filter. This is because four-stroke engines run at higher temps, and if they aren’t getting enough air-flow they will over-heat (more on this in a future article). Adjust the idle speed if necessary. My scooter is the same way. Collectors seem to have cornered the market. Anyone who is logged in can see it but it's down at the bottom so most have either chosen to ignore it or haven't discovered it yet. Just a thought, how about raising the carb needle up a notch as an experiment to see if it improves things. I just accept that after a tank full it's done enough and in most cases so have I. Whilst in conversation with Millers Oils, as suggested by Wristpin, I mentioned that I had been mixing SAE 30 gearbox /engine oil for vintage cars with the petrol to make my own 2 stroke mix. Is this a feature of 2 stroke engines or is there something amiss with it? (4) vapor lock caused by carb vent tubes being restricted or clogged. Here I have removed the complete air filter housing for demo purposes. Just as a compete aside one of the bigger machines in our fleet was a 600cc Panther sloper with side car attached, that thing had so much pull that one day one of the farm lads tied it to the draw bar of a four wheel trailer load of Cauliflower just to see if it would pull it - and it did! I glaze busted the bore as best I could and fitted new rings. 2-Stroke Carb Tuning And Adjustment. Fingers crossed I think I have solved my restarting a hot 2 stroke problem. being 2"). If they are already dodgy, then heat will put them into failure mode. 50cc 2 stroke hard to start when hot. Hopefully the problem has now been sorted. I read somewhere that the porcelain internals of old plugs were glazed where as modern plugs are not and become contaminated . Unless you are riding in extreme climate, your bike shouldn’t take more than a few kicks to get started when properly jetted. I am Dave's Girlfriend Kellilee and bluntly and VERY SADLY he passed away early Tuesday morning. sounds like you don't have any vacuum for the petcock to deliver fuel. An engine fitted with a priming bulb type choke that's hard to start hot, and is Smokey - will likely need the carburetor to be cleaned or replaced. On a few occasions my Qualcast mower with a prewar Villiers 2 stroke engine has stopped during the cutting of the lawn. The engine may flood because of overpriming or because the choke has been left open too far, causing an excess amount of fuel to reach the combustion chamber. My garage mechanic suggested changing the condenser. Is there anything that can be done so this won't be a problem in future? That doesn't surprise me as my Dennis "eats" modern NGK plugs but runs quite happily on old Loge and KLG plugs that are possibly as old as it is. a 40 grade as suggested. Heat is the enemy of condensers (capacitors) at the best of times. When that machine was current the recommendation for oil would have been the motor oil of the day, specific mixing oils for lawn mowers  were not around until the 1960s . Remove the seat, seat … Jeremy McGrath’s CR250 two-stroke started every time because he was the King. the engine I am using is from my chainsaw, … Millers do a two stroke mixing oil specifically for vintage engines. Step 1 Place the machine on a flat surface. Welcome Guest. When the engine is too hot, fuel can't circulate properly due to the way in which vapor obstructs it and therefore the engine wouldn't start as easily as it should or it wouldn't start at all. Is PartsforScooters.com a good place?? sounds like you've got a leak in the cases somewhere if it starts fine with starting fluid. Old mower won't start when hot. If the mains aren't too bad, seals may help as may new rings in a glaze busted bore but for a lasting result a cylinder re- bore and reground crank  may be the only options. By Viper8310, June 20 in KTM 2 Stroke. I have used Champion D16 which are supposed to be the replacement for the old Com 8 in stationary engines and they fail very quickly whereas a cleaned up old Com 8 seem to last forever. One of the most irritating issues that you can run into is overheating of the engine with no apparent reason. High performance 2 stroke engines are very inefficient at low RPM and therefore it is usually best not to set them to idle. Usually the problem is the choke fails to unchoke. Also install a new spark plug because you never know. I need 21x17 13grams. Top Videos Two Ways to Skin a Knee: 2021 Honda ADV150 vs. 2021 Honda Trail 125 When coming to restart the mower on these occasions I couldn't until the engine was cold. I will try to find the article. Does everyone see the Shoutbox, or just the people who you choose? Usually a sign of a worn engine. Once you understand the basic functionality of one 2-stroke carburetor, you can … I have to manually choke it by plugging the intake hole on the air box with my finger while I start it and leave it there for 20-30 seconds till the cylinder head gets hot and the juices start flowing. The engine was stripped right down,cleaned and rebuilt with new piston rings and any wear there was, was minimal. With no seals, and the crank running in plain bushes it could be another wear situation allowing excessive ingress of air. It just needs a bit more effort ! Also, it could start cold but not warm due to the temp of the air being brought into the cylinder. After completing 1 hour of continuous mowing I stopped the mower and it restarted straight away with one turn of the handle, and I repeated this 4 times. If the scooter does turn over but still doesn't start you have to check for a spark and make sure gas is getting to the engine. I don't know what oil was used, nor in what ratio, but the resulting fluid had the consistency of castor oil. The next day, with a dead cold engine, you have to use starting fluid … Correct me if I am wrong but I think I remember the subject of air leakage around crankshaft bearings being raised previously and the question was raised about the use of modern two stroke oils being a contributing factor. I always leave mine idling for 5-10 minutes before I ride, but I don't really understand why. I wonder how many modern bikes would put up with that sort of abuse. I’ve done a ton of research over the years (as well as tossing a 2-stroke weed eater against a wall in frustration) trying to understand this issue. Thank You Brent for befriending my love he was very happy on here! This SAE 30 oil is different to the SAE 30 2 stroke oil and will not mix properly with the petrol. I have spark and getting fuel won't start if its a 2 stroke then you need fuel spark and air to get the bike to start have you got compression? Share this post. Often, the engine will continue to start for the rest of the day as long as the engine does not get too cold. Lodge plugs are very pricey these days. It is not recommended to ride the bike with the choke on, or else, the engine will be flooded and the fuel economy recorded will be the poorest you ever recorded owing to higher revs at idle. When the choke coil burns out the choke fails to turn off, not on, so it's not likely your problem. Good tip and makes sense. :help: That is where I would start too. When I started work as an apprentice, there were still a lot of these two stroke Atco's about, most got scrapped for the problem you are facing. With the help of a few squirts of starting fluid, I can get the motor to normal temps. Sometimes you will run across an old two stroke engine that will only start with a squirt of starting fluid. Just curious what some of the problems are that cause a 2 stroke to not start after it has been run and then shut off. This is all assuming that you have already checked the basics. Certain bikes require more muscle and/or technique to get started, but a solid running engine will only take 1-3 kicks to start, hot or cold. How To Warm Up A 4-Stroke Dirt Bike. For example I didn't have enough fuel in the tank or I had it idling at too slow a speed when talking to the wife etc. IT'S CALLED GARBAGE CAN AND NOT GARBAGE CANNOT. My garage mechanic suggested changing the condenser and as this was a fairly easy thing to do by changing the whole brass 'pill box' containing the points and condenser,which were known to be sound and working, I was able to restart it hot. If there was any unwanted play in the bearings perhaps this could be taken up by using a thicker oil eg. :help: My sons 50cc Adly scooter has become hard to start when its cold. ARE WE SUPPOSED TO TYPE LIKE THIS IN THE SHOUT BOX? All that kicking or pulling is just wearing out your starter and probably your leg or arm in the process. Where do you guys order Dr. Now I am not saying you should scrap yours, but it may be that you need to find someway of replacing the main bearings. This is a common symptom for both two and four stroke dirt bikes. As the wax begins to heat it expands and pushes the plunger out slowly. After approx 4 or 5 minutes the plunger is fully extended closing off the choke ciruit and no longer allowing additional fuel to flow. The bike might start off with high revs or start easy and then move to high revs. Then it's fine after that. Recommended Posts. I bought a Hitachi leaf blower last fall and I love it, except for trying to start it hot. Viper8310 Viper8310 ... in my experience with small 2 strokes, low compression causes hard starting when hot. They run fine but when you shut them down they are hard starting when worn. Most modern scooters have an automatic choke so don’t worry. I also checked the spark on the engine, and even though I had put a new or what I thought to be a new plug in the reconditioned engine it wasn't sparking well. The downside was that they needed a thorough mixing and then had a tendency to separate out if stored - hence the need for a good shaking of the can of mixture before use. Then adjust the mixture screw to achieve the highest RPM. The carb was full of oil and the jet completely blocked but after cleaning all that out and putting fresh fuel in it, it started after about 20 pulls. There are no seals on the crankshaft. Link to post Share on other sites. When a two-stroke fails to start, most riders usually yank the plug, a very logical thing to do. Another possibility is primitive cooling leading to  heat soak in the stopped engine causing premature fuel vaporisation. Making sure that the fuel tank filter is clear with no blockages that can restrict the … When hot, even after several applications of the primer the plug remains dry which suggests premature evaporation or vapour lock. They replaced the CDI twice, the stator, the coil, etc. If so start with a full one and don't worry about it! Always start with checking for strong spark, a bad condenser can put out strong spark when cold, but will quickly fade. When the scooter warms up, it starts fine. I know he would want ya all to know this. so folks, let's get down to the nitty gritty. I would start... - Suzuki FA50 Moped Fuel Tank Filter. I always let it warm up for a few minutes before I take off on it. Definitely subscribe to old spec oils for old engines, eg  a non detergent SAE 30 or 40 mono grade. I have a 1960s Kirby Lauson engined Flymo contractor that I use for the local churchyard, it starts second pull when cold and with great difficulty when hot. This SAE 30 oil is different to the SAE 30 2 stroke oil and will not mix properly with the petrol. Try it! It was being chucked out as the owner said it wouldn't start. Wow, I just found this. I don't really know how to say this but straight. My scooter usually starts OK on the 2nd or 3rd kick. https://youtu.be/mU7gzUwFQAY May be worn rings or drawing air around worn crankshaft bearings and seals. I have acquired an old two stroke mower built in 1959. If that doesn't work, try taking off all of the plastics and check all of the wiring connections carefully. On the flipside: I have recently repaired a four stroke mower whose owner's wife filled it with some bizarre two stroke mix. I have a 1960s Kirby Lauson engined Flymo contractor that I use for the local churchyard, it starts second pull when cold and with great difficulty when hot . You have to get it started and let it warm up first. check it by removing the spark plug and put your finger over the hole air try and start the bike your finger should be pulled into the hole if … Typical problems include hard starting, rough running, a need to adjust the carburetor during use to keep the engine from stalling, a need to rev the engine to keep it from dying, and not starting at all. To check for a spark, remove the spark plug from the cylinder, hold the tip of the plug against the cylinder head and crank the engine. It reads fine on the AC side of the multimeter. running hot... overheating 2 stroke. hmm.. 2 Stroke engines can be finicky. check your intake and reeds for cracks or leaks. When the engine is started a voltage is applied to the heater and the wax heats up. Have memories of those roller shuttered pump cabinets that used to stand on garage forecourts - sort of orange colour I think. A good point that Wristpin makes about old plugs. To test choke plate type, remove the air filter. Enter a word or two to find entries in the forum section. Pull the carb and clean out the idle and main jets. It's usually not too hard and your scooter should start ideally on the 1st kick, but 2nd or 3rd kick is OK too. May be the new rings have not bedded in, particularly if the bore was not glaze busted when they were fitted. Apparently this still is not being used much. I then changed this for an old plug which I had and there was a noticeable improvement. Then turn the mixture screw 1/8 turn in to be sure you are on the safe side (rich). This sounds like worn main bearings, if you try and lift the flywheel, can you feel any movement between the crankshaft and the main bearing, there shouldn't be any appreciable amount. How to start 2 stroke motorcycle won't start easily - YouTube Wristpin's points about ordinary oil are well taken but the point about requiring a good shaking is moot, especially if the tank isn't run dry between uses. Most of the reasons by which a hot engine would be hard to start are based on problems related to the fuel. The answer being to revert to old style SAE30 oil without any additives, the theory being that the modern oils are less able to sustain the sealing effect on the bearings. This 2-stroke carb tuning guide will give you all the information you need to tune your 2-stroke carburetor for peak performance, no matter the make or model. Yes, you definitely need two-stroke specific oil. Many 2-cycle engines have problems and are sent to the junk yard before their time. Should have asked from the outset - is a full tank enough for your usual mowing session? Hi guys I know that with 2 stroke bike engines you are supposed to let them warm up before you use them. It’s to the point I have to take my Stihl with me also so I … Anyway I hate to see old things chucked away so I took it away and stripped it down. This isn't a hot 4 stroke we're are talking about here, 2 stroke engines are very easy to start hot or cold, and hard starting is a sign that something is not right in your engine. There is little or no up and down movement on the main bearings and just a little side play. YAY! I found that the cylinder head nuts and crankcase nuts weren't fully tight so I tightened them up again. (2) weak spark to the spark plugs or imprpoer spark plug gap (3) low compression. They started when cold, but wouldn't start from hot, the cost of replacing the crankcases (the bush was part of the case) out weighed the value of the machine. Go and check out the new one I have made. I am using SAE 30 oil mixed with the petrol in the proportions originally specified. Did you measure the bore for wear and "out of round" and what were the end gaps of the rings when installed in the worn bore? The Millers offering is basically a similar product but with additives to overcome the mixing and separation during storing issues. Thanks for watching and if you have any questions tell me it the comments below. (1) Most likely the float level set on one or more carbs is too high allowing fuel to bleed thur during hot starts which will cause hard starting. When an engine is hot it will bring in heated air which is less dense, as to when it is cold the air wont be heated up by the engine and be more dense, leading to greater compression. Ok, I found that the voltage going to the choke is AC, not DC so that explains not being able to read it. Ahh.. New feature for a new riding season! To set up this test start up your scooter and ensure the choke is off if your scooter has a manual choke. When hot, even after several applications of the primer the plug remains dry which suggests premature evaporation or vapour lock.
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