WE HAD A KTM sx450 that would randomly stall, be hard to start, miss then go on, then stall after 3 hours of riding !
We checked all the grounds, water proofed electrical connections, new in line filter, unhooked kill switch, unhooked the after market fuel controller. It would start and run, but a week or two weeks later, same issues.
Problem: drain hole out of the spark plug cavity partially plugged. When it was in the warm shop for a week, the first few hours we parked it that cavity would fill with melt water, then in a few days drain out. What it did was fill the plug cap with rusty water/rusty dust and on the wrong day more water in there would cause running issues.
New cap NGK 8408 NGK vdo5e and plug for good measure, hasn't run that strong in a year.
Oh well, always something.
We checked all the grounds, water proofed electrical connections, new in line filter, unhooked kill switch, unhooked the after market fuel controller. It would start and run, but a week or two weeks later, same issues.
Problem: drain hole out of the spark plug cavity partially plugged. When it was in the warm shop for a week, the first few hours we parked it that cavity would fill with melt water, then in a few days drain out. What it did was fill the plug cap with rusty water/rusty dust and on the wrong day more water in there would cause running issues.
New cap NGK 8408 NGK vdo5e and plug for good measure, hasn't run that strong in a year.
Oh well, always something.
