Silliarse Posted October 13, 2022 Report Share Posted October 13, 2022 While pottering around on the dunes with my son, my bike, a gas gas 125 has decided to kill itself. While in top gear (and thankfully on a straight bit of beach) the throttle seemed to jam wide open, with no response from throttle, clutch or kill switch (once I`d wrestled it to a halt.) After continuing to scream it then rapidly died. And surprise surprise it isn`t keen on starting, just sounds horribly rattley on the kick start. So my questions to you clever people are What caused this,what`s the damage likely to be and once rebuilt how do I prevent it happening again? I had just filled it with fresh fuel containing 63ml of putoline. Thanks, Jack Quote Link to comment Share on other sites More sharing options...
kurtas Posted October 13, 2022 Report Share Posted October 13, 2022 The throttle has jammed on. In the event of the throttle jamming on you can pull the cable out of the twist grip control at the handle bars, purely by reefing it out, this will normally release the jammed throttle. Second option is to cover the exhaust outlet, if an engine can't expel gases it cant run. Also you could have jammed the brakes on and killed the engine that way. If you are lucky you have only destroyed the top end and the bottom end is still usable, it needs to be disassembled and checked. 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted October 14, 2022 Report Share Posted October 14, 2022 Minimum would be a top end and cylinder. But as bad as it sounds could also be a rod. In case you missed it, it`s not a race bike. It could of been the cable, the throttle assembly, the slide, carb body or missing the needle jet and or the cable attached to the slide improperly. Good luck. Quote Link to comment Share on other sites More sharing options...
rotors7 Posted October 14, 2022 Report Share Posted October 14, 2022 Could it not just be, hopefully...... the woodruff key ? 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted October 15, 2022 Report Share Posted October 15, 2022 That it could, but I would just pull the header pipe to have a look,see. 1 Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted October 15, 2022 Report Share Posted October 15, 2022 I agree with rotors7. I've seen bikes do that with only result being shearing the woodruff key locating the flywheel. You could be lucky. 1 Quote Link to comment Share on other sites More sharing options...
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