High End missing

[gregwillclark]

Afternoon all! I Finally got the fazer back from the garage today after quite a bit of work. All ses to be running well after an 80 mile ride around Brecon, but I did notice a bit of hesitance at the top end when overtaking a car on the motorway. I took it up to around 9.5k rpm and it was pulling like a train, then suddenly it felt like it hit a brick wall and it started missing, opened the throttle a bit more and a suddern surge of power! It's very strange, was wondering if the HT leads or rectifiers could be breaking down under heavy load??

Greg

[Punkstig]

Sounds like it's dropping a cylinder, after its warmed up spray/ throw a bit of water on the exhaust headers, if one takes longer to dry off that points to the cylinder with the problem

[gregwillclark]

All cylinders firing fine at low revs and tick over.

[gregwillclark]

Anyone know if the coils can cause this?? Anything I can do to diagnose the issue?

[Sanchezz]

Looks like air filter problem to me. Some say this is hiflo air filter issue. Just my two cents though..

[MarkWales]

Any improvement?

[gregwillclark]

Not sure yet, Ive changed the plug caps to new NGK's from M&P, also adjusted the TPS as this was showing 10k rather than 5 so I will hopefully find out this weekend.