I have compression, spark, and gas/oil mix. engine not starting.
I have excellent compression, spark, and gas/oil. It isn't the carb. I took that entirely apart, cleaned it, and reassembled it. I know the primer button works, and it doesn't even run when I put starting fluid in. I'm thinking about tearing it all apart, cleaning, and reassembling. any thoughts?
An expert who has achieved level 3 by getting 1000 points
An expert that got 20 achievements.
An expert that got 10 achievements.
An expert that got 5 achievements.
Re: I have compression, spark, and gas/oil mix. engine...
When cleaning the carb., use a De tek Brush,(used for cleaning between teeth), to clean the small portals. The smallest particles can keep it from running. More than likely though, It will be the small screen in carb. It can become clogged up to the point where you can't even see daylight through it; not good!
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need. goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
You need several things for a running internal combustion engine:
Spark (to start)
You've shown that you have a workable spark plug so far. Going from the above, consider as well
Fuel. Bad / old / contaminated fuel. Clogged fuel filter. If it's a motor that needs gas/oil mix, does your gas have the right oil mix?
Air: Dirty, clogged air filter or air inlet.
Spark. Is any electricity making it to that proven-workable spark plug?
Compression. For this one, the most likely problem (other than a toss-the-engine thing like a broken piston) would be if the spark plug is not tightened into the mount hole, allowing the air to leak out rather than compress.
Exhaust. Most lawn mowers will have a spark arrestor on the exhaust to make sure you don't set a dry yard on fire with your exhaust. It's often overlooked in diagnosing two-stroke engines. Make sure it's not clogged or blocked.
Lubrication. Is there oil of the right type, and up to a proper level on the dipstick. No oil equals way too much friction in the engine.
When you tilt the mower too much oil will mix with gas. Try taking out the spark plug and cleaning it good in case some oil got on it. If this don't solve it, drain the gas and refill with fresh gas in case oil mixed with it when you tilted the mower.
If the saw briefly runs when you prime the carb and/or cylinder with gas then most likely fuel is not getting thru the carb. Try rebuilding the carb and replacing the fuel filter first. You can also search on youtube and google for troubleshooting tips.
On this model the carburateur will sometimes come loose, in which case the engine will lose compression. Check that the carb is tightly mounted. Otherwise, the most common reason for non-starting is that you are using either old or or an inexact gas/ 2 cycle engine oil mixture. Remix a new batch using exactly one gallon gas and a measured on gallon mix of 2 cycle engine oil. Drain the blower's existing gas into a jar and replace it. You can use the jar of mixed oil and gas to light a campfire or bonfire, or just let it evaporate.
if you have a good compression,a strong enough blue spark and carburetion for the fuel air mixture try priming the engine(put small amount of gas in the spark plug hole)then start the engine.If the engine runs only the gas you put inside the cilinder there is a carburetion problem to find and fix.
let me know regards savumihai71
There is a proper way to start the engine. Four controls are on your bike to assist in starting.
The choke, used when the engine is cold. Pull the red knob for choke.
The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
The de-compression lever, always used.
The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Give a strong kick through the full sweep of the kickstart lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.
DO NOT mix oil in the gas on your four stroke engine. You will foul the spark plug(s), build up deposits on the valves and head, and make a smokey, smelly mess. A two stroke engine uses the fuel/oil mix to lubricate the engine before being used as fuel. A four stroke engine has a separate lubrication system and does not normally burn any oil. As the name implies, a two stroke engine works in two strokes. The first stroke is downward, where the fuel/oil mix and air are drawn into the cylinder. The momentum from the crankshaft counterbalance or force from the other cylinder(s) drive the piston back up compressing the mix, and the spark plug sparks at or slightly before the top of the stroke. The rapid combustion of the fuel/oil/air mix drives the piston down, which is the power stroke, and then the cycle starts all over again. A four stroke engine has an intake stroke down taking in the fuel/air mix, a compression stroke up, a power stroke down as the fuel/air mix is ignited at or before the top of the stroke, and a exhaust stroke up before starting all over again. A four stroke is much cleaner and more reliable than a two stroke, but it is heavier and has less torque. A two stroke engine is much lighter and has more torque, but takes more maintenance.
1. has it been sitting?
2.if yes dump out the old gas and what is premixed since it is possibly old, 2 months max.
3. new prem gas and oil mix.
4.press the comp release when starting , was this pressed when you checked compression?
5.if will not sart try a quick blast of WD-40 in carb or a little gas. WD is flammable and will let you know if fuel related. if it fires for a couple seconds then sparks ok and still has gas problem. try one more time and maybe stuck fuel pump flaps in carb will become unstuck. if it runs on WD or small amount of gas in carb but not otherwise, sparks OK. time to rebuild carb check filter and Gas Line.
As always when playing with gas or other Flammables have a Fire Extinguisher ready for the "Expected". Always expect a fire that way you are calm, VERY important if you have spectators.
Safety Guy Bill