20 Most Recent 2000 Yamaha XV 125 - S Questions & Answers

i had a simuler problem with my honda cr 250 moto-x bike it would start fine and you could keep it ticking over with the throttle(i have deliberatly unscrewed the tickover in case i come off,it will cut out) when i got on it,it would go for about 400-500 metres then splutter and die and not start again for around 5 mins. i immediatly knew it was a fueling problem. so after stripping the carb and giving it a good clean out i was baffled when i got back on and it still done the same. i then dismantled the fuel tap cleaned it all out and put it back together and tested it,it was very very slow so i unsrewed my fuel cap a little and was greated with the familur gush it should deliver. problem solved! the vent in my fuel cap had crystalised up,so the fuel was coming out but the air was not getting in,causing a vacuum and slowing down the flow and basically emptying the carb quicker than it can fill back up!!! clean your carb,fuel tap and any vents in your cap or tank. if this does not work then your bike must be over fueling or low on compression.

should be able to seal or small air vent one or the other? If you need further help, reach me via phone at https://www.6ya.com/expert/scott_8b3f0f0fc5f566a7

I believe the standard starting place is to go 2 jet sizes bigger, but I would check with the manufacturer of the big bore kit to make sure. Hope this helps

old fuel and damp air will cause it ! clean out and soak in petrol and blow out with compressor !

could be an electrical short or the exhaust is leaking ! ? check wires etc

Push all the way down to 1st gear and it is a half step up from there.

SIDE PANELS /OR UNERSEAT /OR UNDER PETROL SIDE BATTEY LOOKING FOR 4 OR5 FUSE P/S LOOK FOR MAIN WIRE IS RED FROM THE START MOTOR

its one of four problems,.. not enough or excessive fuel or air. Or the filter is holding back the gas when on demand.

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it maybe that its just not charging the battery up and the lights just **** up all the power or it could be a very bad earth on the lights if you go putting in a brighter bulb thats just going to make it a lot worse, check out the charging rate first

sounds like fuel issue to me. You stated you have spark on both cylinders. If this started after someone worked on it then you need to bring it back. Only they know what they may of left off or did halfass

If you haven't used it for a year, I'd drain the gas and replace with fresh. Also since you found some dirt in the jet, I'd throughly clean the entire fuel delivery system, from the tank to the carb,,inline filter replace etc. Take the carb apart and soak in carb cleaner, then blow out, blow jets as well, and it wouldn't hurt to replace the needle valve seat. Next, make sure you are getting good spark. If you have the proper fuel/air mix and spark properly timed, your engine should start right up! Good Luck, Hope this helps!

Spring may need replacing. It could be tired after years of faithful duty. Be sure that the side stand and spring are actually made for your bike, if not, the tension and length will be off.

Happy riding...

Obe

Hi,

I had the same problem with mine. Its a dodgy ignition coil i found a spray of wd40 on it would fix it for a while by driving out the moisture. I've since put a piece of plastic bag around it which helps alot. Should really give in and buy a new coil though

Throttle cable?

sounds like you need to take it back thier resoncible to fix it with out cost to you hope you rang them and told them whats happening as it sounds like they put the pedal rod on upside down if its drum they may have dislodge your spring on the break pads hope this help also find a bike machanice you can trust motor bike clubs are good to jion as well if its disc could need a new calaper kit and flush your lines

hi,says here you had the carbs redone,it sounds to me like the carbs were not rebalanced after installation,if you do any work at all ocn carbs it is quite important that the carbs be properly rebalanced,it only takes very minor adjustments inside carbs(even a scratch on a jet)or different torque settings on screws etc will trow the balance out,if you get this done i think your problem will disappear..hope this helps