Hi everyone, I have a semi delemma on my hands. I've got an 02 CR 250 that for the second time took off like a sewing machine gone mad and I had to kill it by stomping it into first with both breaks applied and dropping the clutch. The kill switch wouldn't do a thing. This happened this AM after cleaning the bike, opening up the line to give some gas, closing the line back down and pulled the choke (just wanted to fire up the bike after washing it and not store it with a full carb). Did I create some kind of vacuum by closing back down the petcock? It happened right when it fired up?? This was not the typical load up scenario that drops after the warm up cycle.
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The redline experience also happened last winter when climbing a snow rutted hill near pinned in 2nd right when I reached the top of the hill. When reaching the fire road I had to turn into the hill and drop the clutch after a number of attempts on the kill switch. Normally the kill switch works fine to shut down the motor at a standard RPM, but this was going off the hook. I can rule out a number of things:
1. Last year this happened with the Mikuni jetted fine (s8,190m,30p,75 needle middle, 3000 ft @ Pillsbury 40 degrees and humid. Stock piston, stock porting. The slide was clean, the cable was routed correctly, No air leaks, etc.
2. This time it was in my driveway after washing but now I have the Keihin airstriker off the 00' CR jetted with 180m,45p, 715 needle middle, 500 ft 60 degrees and humid. The carb is practially new, 2 rides with a new throttle cable, recently ported by Eric G for low to mid with Wiseco piston and new reed gaskets. Also installed a new moose billet throttle tube which checks out smooth.
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I've read through numerous threads after the first experience, checked for air leaks around my v-force reed with carb cleaner, checked the cables, and didn't find anything??
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My real concern is I just ordered a rekluse z-start and was thinking, what if this happens to take off again with an auto clutch???, I've got an oversized Clarke and can't get to the plug ...If this happens again is it gonna blow my motor with an auto clutch? Any way to shut it down?? Any ideas out there would be great. I love my powerband and would hate to have to send another jug out for porting.
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Here are my mods if it helps.. Keihin, v-force 2 on low tension, Gnarly pipe, Q silencer, Eric G porting, Stock plug, 14 oz fww, running 91 w/ spectrol @ 36/1. Eric ported for pump gas at altitude. The bike doesn't tend to ping/knock and I keep the RC cables in spec. What makes no sense is this has happened with 2 different carbs, two different cables, ported and unported. And no worries in between yesterday and last winter?? I read a post somewhere about the engine getting so hot it runs on its own but this is two different scenarios, one hot and one cold.
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Thanks for any advise all. Sorry for the long post, just wanted to give as much info. as possible. I'm just lost at this point.
***
The redline experience also happened last winter when climbing a snow rutted hill near pinned in 2nd right when I reached the top of the hill. When reaching the fire road I had to turn into the hill and drop the clutch after a number of attempts on the kill switch. Normally the kill switch works fine to shut down the motor at a standard RPM, but this was going off the hook. I can rule out a number of things:
1. Last year this happened with the Mikuni jetted fine (s8,190m,30p,75 needle middle, 3000 ft @ Pillsbury 40 degrees and humid. Stock piston, stock porting. The slide was clean, the cable was routed correctly, No air leaks, etc.
2. This time it was in my driveway after washing but now I have the Keihin airstriker off the 00' CR jetted with 180m,45p, 715 needle middle, 500 ft 60 degrees and humid. The carb is practially new, 2 rides with a new throttle cable, recently ported by Eric G for low to mid with Wiseco piston and new reed gaskets. Also installed a new moose billet throttle tube which checks out smooth.
***
I've read through numerous threads after the first experience, checked for air leaks around my v-force reed with carb cleaner, checked the cables, and didn't find anything??
***
My real concern is I just ordered a rekluse z-start and was thinking, what if this happens to take off again with an auto clutch???, I've got an oversized Clarke and can't get to the plug ...If this happens again is it gonna blow my motor with an auto clutch? Any way to shut it down?? Any ideas out there would be great. I love my powerband and would hate to have to send another jug out for porting.
***
Here are my mods if it helps.. Keihin, v-force 2 on low tension, Gnarly pipe, Q silencer, Eric G porting, Stock plug, 14 oz fww, running 91 w/ spectrol @ 36/1. Eric ported for pump gas at altitude. The bike doesn't tend to ping/knock and I keep the RC cables in spec. What makes no sense is this has happened with 2 different carbs, two different cables, ported and unported. And no worries in between yesterday and last winter?? I read a post somewhere about the engine getting so hot it runs on its own but this is two different scenarios, one hot and one cold.
***
Thanks for any advise all. Sorry for the long post, just wanted to give as much info. as possible. I'm just lost at this point.