2007-06-08 13:37:28 · 12 answers · asked by Anonymous in Cars & Transportation ➔ Motorcycles
Argggghhhhh!!!!!
piston slap in a motorcycle is caused by the same thing that causes it in a car, your air/fuel mixture is preigniting, another name for piston slap is preignition.
It can be caused by several things. low grade gas, most likely. can also be caused by timing to advanced, carbon deposits in the cylinder. or even overheating will cause it.
2007-06-08 16:58:52 · answer #1 · answered by Nancy P 5 · 0⤊ 3⤋
The only other reason I can add is piston skirt length.
Stroker pistons have the wrist pin hole relocated lower on the skirt, making the piston ride higher at TDC and lower at BDC, in effect, lengthening the stroke of the engine. The side effect of this is with a shorter piston skirt length, the piston tends to rock, or "SLAP" more.
2007-06-08 22:11:31 · answer #2 · answered by strech 7 · 0⤊ 2⤋
Running the engine low on oil, especially under load for long runs will cause the skirts on the pistons to wear quickly, then, the piston slap knock noise. Time to rebuild.
2007-06-08 14:15:29 · answer #3 · answered by Mikel 4 · 2⤊ 1⤋
2 Stroke Piston Slap
2016-12-17 09:56:49 · answer #4 · answered by ? 4 · 0⤊ 0⤋
the piston moves too high and "slaps" the top. In cars, it usually goes away when it heats up. It can cause damage to the top of the piston and cause it to round out.
2007-06-09 06:45:16 · answer #5 · answered by Anonymous · 0⤊ 2⤋
a mechanic has already told you what the problem is, in fact when the oil is low, and the noise gets louder that confirms the problem is likely in the bottom of the motor, and is likely due to low oil in the past. That knock is probably a bearing that already spun, and now you have a tight spot , which is getting a little worse for every second that engine is running. Its also getting ready to blow up. I suggest you stop driving it until its fixed. or your going to have nothing to rebuild
2016-05-20 05:58:10 · answer #6 · answered by angeles 3 · 0⤊ 0⤋
You sure it's piston slap?
Might just be "ping" from bad gas, or from cruddy/misgapped spark plugs. Check your spark plugs, then buy a bottle of gas additive (you know, STP makes it, it's supposed to clean carburetors or fuel injectors or whatnot) and pour a quarter of the bottle into a fresh tank of gas.
2007-06-10 10:19:09 · answer #7 · answered by Anonymous · 1⤊ 0⤋
large clearance between the piston and cylinder, or in the connecting rod/wristpin/piston area.
Sometimes, engines meant for racing have loose clearances built in, to allow for heat expansion. Therefore, before they're "up to temperature", there's some rattle in there.
2007-06-08 13:41:08 · answer #8 · answered by The Avatar 3 · 3⤊ 1⤋
piston slap is caused by slack somewhere in your motor.it can be a rod bearing,wear on the wrist pin,a wrist pin bearing,worn out rings,a number of things really.you just have to take the engine apart and find out where the slack is coming from.
2007-06-08 13:49:58 · answer #9 · answered by husqvarnadirtbiker 1 · 0⤊ 3⤋
Most of time it's bad crank bearing. Tear down time for the lower end. And that sucks cause the season is just stating in the nothern part of this country, USA.
Get er done and ride-on
2007-06-08 13:47:43 · answer #10 · answered by LifeRyder 4 · 0⤊ 4⤋