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Had a crash. Changed out a few parts , including exhaust ( it was banged up so i went and got an aftermarket one ) and seen a pretty big improovement in performance. First ride after the change , heard a little pop ( just like a popcorn kernel - very subtle but still audbile ) then I had a sudden stroke of power. It felt so much faster and agile.Stock I got about 120 km/h top speed , now had around 135. The bike felt less restricted and running smoother than ever. 2 days ago , the exact opposite happened. I stopped at a red light and heart that exact sound. It is very distinguishable so I can guarantee those were the only 2 times I heard it. Then I started getting worse top speed. Way worse. Like , it struggled to reach 107 , and capped out at 108. What is happening? Some people told me it’s running “lean” , others that it’s a fuel mixture problem… I don’t know. Only 6th gear seems to be affected. 1-5 pulls tiny bit slower but barely noticable. Everything else is stock besides
the exhaust and brand new air filter ( to OEM specs ) , changed oil and only fill up with 100+ . Any help is apreciated , thanks in advance
 

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YZF R125 ABS (2015)
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53 Posts
Hi
Spark plug cap not making good contact
Spark plug drity
Ignition coil defective
Fuel tank breather obstructed
Fuel pump faulty
Fuel hose clogged
Inteke air leak check intake duct joints
Low compresion (check compression)
Throttle valve doesnt open fully
Cluth slipping
brakes dragging
 
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