Help please 2 stroke or 4 stroke

[briandx88]

Hi guys just wandering how to find out if my 2016 sym jet4r is 2stroke or 4 stroke I have know idea of knowing as it didn’t come with the owners manual .

Any ideas how I can find this out would be great.

[aeroxbud]

If it has valves and oil lubrication in the bottom of the engine. It's a four stroke.

[90GTVert]

If there's a dipstick/oil fill and a drain plug in the crankcase, it's a four-stroke. If not, it's a two-stroke... or you haven't looked hard enough. Don't confuse this with a transmission or gearbox drain or dipstick. Those will be toward the rear of most scooter engines. Engine oil related holes will be up front, nearer the flywheel/fan area.

Two-strokes and four-strokes sound different. A four-stroke sounds like most engines that you hear, because most other engine's are four-strokes. A two-stroke sounds more tinny. Think chainsaws and weed whackers.

If people seem excited when you ride by, it's probably a two-stroke. 😁



A quick google tells me that a 2016 Jet 50 should be a two-stroke. Larger models are four-strokes.

[TheScooterJesus]

Post a picture of the engine/exhaust

[FrankenMech]

Do not run the engine until you verify the type. A two stroke (2T) will need an oil tank full of two stroke oil or pre-mixed fuel in the fuel tank. Plain gasoline without oil mixed with it somehow will ruin the engine.