Question about 2007 Highland Supermotard

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I have a cpi sx 50 cc with a big bore kit 80cc i put a new spark plug in and it fires up no problem and rides ok then after about five min riding the bike cuts out and wont start again until it cools down please let me know if you know thanks paul

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Sounds like an ignition problem namely the coil or module. you might check to see if these are warm to the touch or hot after riding your 5 min. if so a meter check will determine if replacement is necessary. also check for loose leads anywhere. also make sure your plug is good and the right heat range for the bike. i assume you are saying it quits running but doesnt lock up. if its seizing up then your rebuild kit is likely the culprit and will have to tear it down and check clearances with the rings and cylinders and piston etc. good luck.

Posted on Jun 01, 2010

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New spark plugs last 10-15 minutes of riding


Hi and welcome to FixYa,

Offhand, the only factor to be checked that could foul a sparkplug for your bike would be the 2T oil injector/pump. There is too much 2T oil going to the combustion chamber. Either the injector would require restricting or for some reason, there is also 2T oil in the fuel tank (pre-mix).

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 07, 2008 | 2008 KTM 250 SX

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