How are you ?
When did this happen, how long ago ? What were the weather conditions ? What were the riding conditions ? Has there been a change in elevation ? Did this happen after the bike had sat for quite a long time without being ridden ?
Lots of directions to go here. I will start with a few and let me know if you have questions, I will list what to check and look for and some tips here.
Clean or replace the air filter. If the bike has sat without being ridden for quite some time or if it has been a while since the last carburetor service, then I would rebuild or clean the carburetor. Check for intake leaks around the intake boot and head gasket, which is located between the engine and carburetor, spray some carburetor cleaner in thee areas and if the rpms change, you have a intake leak, If the boots are cracked or torn replace them. Check your ignition coil wire and spark plug cap for splits or cracks, if there damaged replace them ( I would trim them back about 1/4 of an inch or so and see if it helps, the spark plug cap, can be removed by turning it counter clockwise ) Lastly compression test, vacuum test and crankcase pressure test to verify intake and crank seals and gaskets.
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Thanks. RaceTech ( Suzuki ATV & Motorcycle Expert )
Of you have other thoughts or questions. please post them.
If you do, please reply back by answering my above questions and then your repsonse and your sparkplug colors.
Thanks for the advice. My mechanic suggested that i replace the reed valves after doing so, the problem slightly lessened but didn't go away. now when i change my spark plugs, i found alot of oil residue