SXR bent gap on sxr spark plug????????

Tom54cat

Tom54cat

Dirty Water Bikers
Location
Tricities
riding a sxr and started running like crap checked spark plug and end of spark plug touching electrode changed plug rode for another hour and happend again????? WTF any one have any ideas on whats going on?.....plenty of compression and pistons look good looking down spark plug holes???? Im lost any help is greatly appreciated

Tom
 
Tom54cat

Tom54cat

Dirty Water Bikers
Location
Tricities
Don i was already thinking it but need to hear it ......dang well if they aint breaking your not riding hard enuff .......
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
It could be something broken in there, pull the head to make sure. Is the ski moded in any way? Preignition/detonation can cause this, then you have to figure out why; lean, not high enough octane, or ignition issue.
 
Tom54cat

Tom54cat

Dirty Water Bikers
Location
Tricities
150 psi on both cylinders dont think its a ring but will pull head to confirm no mod stock boat ......it was different gas then all other skis my son likes the high premium grade which should be higher octane but was from a mom and pop gas station....
 
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Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
On a stock ski, you really shouldn't NEED premium. If everything under the head looks good, I'd check fuel filter, make sure it's not plugged, check the little filter screen in each carb, check that no air is getting into your fuel line (a loose line can cause air to be sucked in making your carb go lean), then if all that checks out, pull front cover and make sure the ignition pick up mounted in the cover is in good shape and not loose.

The only time premium should be needed is when you bump compression or advance the ignition.

Are you in Tricities, WA? It's nice and warm over there and detonation is more likely in warmer weather. The higher the octane, the slower the flame front, so it's entirely possible that you had detonation occurring in the chamber because of the premium gas and the warm weather...or you got a crappy load of gas.
 
Cannibal

Cannibal

Tasty Human
Location
Summit Lake, WA
Ya, sucks. Detonation is the usual cause for a closed gap. Sometimes you get away with the closed gap being the only damage, sometimes the damage happens before the gap closes.

Time for a rebuild, but you need to figure out why the detonation. It's nice to find a smoking gun before your rebuild so you know you won't do this to your fresh engine.

You should pressure test the engine for air leaks. This causes a lean condition and detonation. Oil in your front cover or out the back seals are a sure sign of an air leak as well as oil residue near the base gasket or case gasket.

Next check your carbs and little screen for debris.

Check fuel lines and pickup to make sure you are not sucking air in.
 
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