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QUADCRAZY ATV Forum & Community
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Recent Forum Topics
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3
1988 LT80 Crankcase Full of Oil
I have NO experience with 2-stroke...I just came to look at your post to see why "crankcase full of oil" would be considered a problem 🙂 -
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1988 LT80 Crankcase Full of Oil
First off, Thanks for the detailed reply. The fluid I drained from the carb and seapping out the exhaust port is definitely straight 2 cycle oil. It's blue and thick. It will only crank over a few times before it "locks up". I pull the spark plug and it's dripping with oil. I turn it over without plug until no oil comes out, put the plug back in and the same thing happens. I have fuel off and line from oil pump disconnected. The oil tank is also empty after sitting which is why I thought it may have drained into carb and crankcase. My thought was to just premix the gas as you mentioned was done prior to oil tanks. I just bought the manual(I'll have print as its hard to read PDF on my phone), but not seeing anything about filling or draining crankcase. There is oil about an inch from the bottom of cylinder once removed. I just don't understand where else oil filling the cylinder could be coming from after I drained carb and rolled it over without plug have fuel and oil injector disconnect. I'll pull the cylinder off and take a photo. -
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What's the best kid's atv?
Good opportunity to revive an older topic. 😁 For anyone 6 and older, check out the following Kawasaki KFX 50 Polaris Outlaw 70 Suzuki Quadsport Z50 -
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Rockymtnatv - Ten Dollars Or Less - Rocky Mountain ATV/MC
Anyone purchase or check out Rockymtnatv lately? Well I was just browsing over there and they have a pretty cool section called Ten Dollars Or Less. Some interesting things to check out if you are in the market. -
3
94 Kawasaki Mojave 250 - No spark, Very confused
Simple test is to look for a pulse of voltage coming out of the stator plug. Most of the wires will have a regular AC voltage and be insulated from the earth, and one wire or a pair of wires will have a pulse. -
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1988 LT80 Crankcase Full of Oil
I'm pretty sure the oil pump will have a spring loaded valve(check valve) to prevent oil from the oil tank draining straight through the pump and into the engine. The weight of oil under the influence of gravity isn't enough to open the valve, but the vacuum/pressure applied to the oil by the pump does open the valve. To test that valve you might be able to disconnect the hose going from the pump to the carb or inlet and watching to see there is no slow leak of oil from it. I say might because I'm not sure that will have a oil pipe, some models might pump oil through a hole in the cases to the main bearings. If the oil isn't leaking out of the hose it may be leaking from the pump into the engine due to wear, but, even with wear it should only leak when it's not running, if the check valve I described isn't working. And.. All that said.. Are you sure it is oil overflowing out of the engine ? Those oil tanks don't hold much oil. Are you sure it's not fuel with a bit of oil in it ? Have you checked the fuel tap is operating properly ? And to answer your questions.. The insides of older two-strokes were lubricated by oil mixed into the fuel in the fuel tank. In those models they got too much oil at light duty, or too little oil under sever conditions, depending how much oil you pre-mixed into the fuel. In later models they used a small oil pump to inject oil into the carb or inlet. The pump is adjusted by a cable from the throttle so that the pump puts out more oil at larger throttle settings. That tends to ensure the engine gets the right amount of oil for the load it's under. That system though still didn't distribute the oil to the critical places as well as we might hope so in even later designs they started pumping the oil straight to the main bearings and it got mixed and distributed with the fuel to lubricate the rod and pistons in the crankcase. Some models they used oil straight to the bearings, and to the carb or inlet, at the same time, using hoses or drilled passages. . -
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94 Kawasaki Mojave 250 - No spark, Very confused
Thank you for the reply, Mech. I'll have to go and try this later. I was struggling to remove some of the flakes last week, but i guess i need to go back and get it as spotless as possible. I really appreciate your response. Hopefully everything works out. -
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94 Kawasaki Mojave 250 - No spark, Very confused
It only takes a single flake of steel, bridging between the trigger coil's steel core and the flywheel, to short out the magnetic field between the flywheel and the trigger coil's pole, and the cdi won't fire. A build up of iron dust on the trigger pole can do the same thing. You need to get an analogue volt gauge and check there is a pulse of voltage getting to the cdi. A digital gauge won't always detect the brief pulse but the needle on the analogue gauge will flicker so you see it. Some kawasaki use a 12v system of ignition so if the trigger pulse is getting through and it still isn't sparking then we need to get a manual and check the resistances and output voltages of the stator. If there is no pulse from the trigger coil then you check there is continuity from the cdi unit to the trigger coil and if that's ok you need to take the side cover off and get every flake of steel off the flywheel and stator pole. Steel flakes or dust can also short out the charging cores of the stator. The best way I've found for getting dust or flakes off is to use a rag and grab it and wipe it off. It takes a while fighting the magnetism but eventually it's possible to get every little flake out and enough dust off to prevent it bridging the gap between pole and flywheel.- 1
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1988 LT80 Crankcase Full of Oil
Greetings, Have a 88 LT80 that been sitting for a couple years. Bought a new piston, cylinder and head. Installed these, rolled it over and it quickly locks up. Took carb apart. It was full of what appears to be 2 cycle oil. Cleaned it, but keeps locking up and 2 cycle oil continues to seap from exhaust port. When i installed new cylinder, I noticed crankcase was full of oil. I'm now wondering if that oil is what's getting sucked up into cylinder. Should there be no oil in crankcase? If that the case, how is crank and rod lubricated? Sorry, never worked on a 2 stroke. Thanks! -
3
94 Kawasaki Mojave 250 - No spark, Very confused
Hello, im looking for some input on this situation i have. My 94 Mojave has no spark, and i have no idea what it is. Ive replaced/tested the magneto, the pickup coil, cdi, the ignition coil. Even the key and Killswitch. I haven't tested the harness its self, but i have tried another harness and still nothing. The only thing i can think of is the fly wheel itself. I have found a lot of metal shavings in the fly wheel and have cleaned it the best I could. But nothing happened afterwards. I am truly stumped here and hoping some of yous could shed some knowledge/ideas that could help get this thing to fire.
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