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43 Posts
2005 F-12X stock except Mac-boost chip. Been a great, fast, and basically maintenance free craft for years until 2010.
Last year at the lake it acted up, but after a 10 minute cool down, while riding my 650SX, it went away completely (rode for another hour wide-open throttle no problems, now it's back!
First off: just finished yearly maintenance, new plugs, new filters (oil and air), lubed all fittings, emptied and flushed the fuel tank, just put in 91 octane.
Tested on the trailer with cooling hose attached
Tried disconnecting the boost chip, last year at the lake and now, no difference so that's not it.
Idle is normal 1200 (+-100), at 2000-2500 starts to stumble, does not appear to be the motor (hope to God), i.e. no metallic noise when I used my mechanic's stethoscope. Somewhere in the back compartment there is a clunking noise, Had thought the shaft bearing may be bad allowing the impeller to hit the outer ring when the engine torques or spins up but if so why would it do it and then stop and run fine, that makes no sense.
Other thought is the turbo unit, maybe the waste gate or WGS is bad and it bleeds off all pressure. The unit is well preserved, lubed regularly and the waste gate opens/ closes by hand.
So unsure what the hell it is. Problem is it is beyond me to diagnose. And I can't afford to take it to the local dealer, Fun Bike Center, as they charge $200 just to diagnosis it. I just retired from the Navy and am unemployed so that's not an option till I find work.
So I'm going to take it out to the beach and see if the problem persists (I know it will) but better to try and have to spend 4 hours cleaning then a $600.00 bill I CAN'T AFFORD, I can at least enjoy my 650SX.
Any advice would be helpful.
David
Last year at the lake it acted up, but after a 10 minute cool down, while riding my 650SX, it went away completely (rode for another hour wide-open throttle no problems, now it's back!
First off: just finished yearly maintenance, new plugs, new filters (oil and air), lubed all fittings, emptied and flushed the fuel tank, just put in 91 octane.
Tested on the trailer with cooling hose attached
Tried disconnecting the boost chip, last year at the lake and now, no difference so that's not it.
Idle is normal 1200 (+-100), at 2000-2500 starts to stumble, does not appear to be the motor (hope to God), i.e. no metallic noise when I used my mechanic's stethoscope. Somewhere in the back compartment there is a clunking noise, Had thought the shaft bearing may be bad allowing the impeller to hit the outer ring when the engine torques or spins up but if so why would it do it and then stop and run fine, that makes no sense.
Other thought is the turbo unit, maybe the waste gate or WGS is bad and it bleeds off all pressure. The unit is well preserved, lubed regularly and the waste gate opens/ closes by hand.
So unsure what the hell it is. Problem is it is beyond me to diagnose. And I can't afford to take it to the local dealer, Fun Bike Center, as they charge $200 just to diagnosis it. I just retired from the Navy and am unemployed so that's not an option till I find work.
So I'm going to take it out to the beach and see if the problem persists (I know it will) but better to try and have to spend 4 hours cleaning then a $600.00 bill I CAN'T AFFORD, I can at least enjoy my 650SX.
Any advice would be helpful.
David