8/24/2023 0 Comments Suzuki 250 bad spark plug symptomsAirleaks can be caused by a bad seal in the engine, or in the intake/carburetor joints. If the bike does not idle smoothly or takes a long time to settle back down to idle speed, and you've already cleaned the carburetor, you may have an airleak. Do not use steel or anything to hard to clean out the jet, you may accidently enlarge the jet, changing the fuel mixture. Poking a small piece of soft copper wire through all the holes, followed by a good blast of air or carb cleaner works well. Pay close attention to the small holes in the carburetor jets, just because you can see light through the hole does not mean it's not restricted by residue left from evaporating fuel causing a lean fuel mixture. If the tank is venting properly, and fuel flowing well to the carburetor, I'd clean the carb. With a gravity feed fuel system, a clogged gascap vent, or misrouted/to long of a fuel line are common culprits, especially as the fuel level gets lower in the tank. I would start with checking fuel flow, as well as the fuel level in the tank. Assuming that the ignition system is in tip-top shape, that sounds like a fuel related issue. Arcing across the points is a good indication of a bad condenser. Please let me know if you have any ideas as to where I can start troubleshooting (aside from the clutch, of course), as the weather's nice and I'm hoping to get it going this weekend - fingers crossed!Īlways start with checking for strong spark, a bad condenser can put out strong spark when cold, but will quickly fade. I sincerely hope the clutch isn't the culprit, since it's an expensive fix. After I got home, I "smelled" around, but couldn't pick up any burnt clutch scent. I thought - for just a second - that I smelled a burning clutch when I was riding it back home after the intersection incident. It was so weak that I had to push it up a hill to get it back to my residence. It felt as if the engine was providing power for a couple of seconds, then stopped the power delivery for a couple of seconds, and it kept doing this over and over. I managed to get it moving, but it hit 10-12 MPH on mostly flat land (where 27 MPH was common). This time I'd say I was on full throttle ~5-10 seconds while stationary.Ī couple of days later I fired it up, but it ran horribly. I've revved the engine like this in the past (with the moped stationary), but for shorter durations. It was consistently going slower afterwards, and I scurried back home as best as I could. It absolutely refused to go past 20 MPH even though I'd usually go 27-28 on the same stretch of road. I pushed off from standstill, the scooter started moving fine, but soon thereafter started lagging. I revved the engine while still stationary in anticipation of the light turning green - I didn't want to hold up traffic, and the 50cc engine takes a while to get going. Near the end of my ride, I stopped at an intersection to make a left turn. I was test-riding it after a short hiatus, and the moped was running fine. Things were looking up: I replaced the spark plug, cleaned out the exhaust, adjusted the idle / fuel screws, and even replaced the brakes (I can stop now!). These crank seals when leaking suck in transmission oil.I recently managed to get the moped running properly, albeit for only a short time. Lastly, check the reeds, float height on the carb and the crank seal on the clutch side. If so, you'll need a top end rebuild kit and of course a new spark plug. If you have trouble getting up to speed that's another sign you have clogged or stuck power valves. Check your air filter too.Ĭlogged power valves eat spark plugs for lunch and if I had to guess based on how often it sounds like you are changing the plugs you probably have clogged power valves. Bad jetting, bad gas and an incorrect gas to premix ratio all result in fouled spark plugs. If your bike releases a lot of black smoke you might have a "rich fuel" environment. A too rich air/fuel mixture is a great way to ruin a spark plug. Worn or damaged pistons leak oil which fouls the spark plugs. So, you have some work ahead of you to determine why you keep fouling the spark plug in your 2-stroke dirt bike. Running old gas is one possible answer though if you ride as often as it sounds like, you probably are not using old gas. Q: I keep fouling the spark plug on my 2008 YZ250. Here's the latest in our "Ask a Mechanic" series.
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