AJS Daytona Losing power

[kezzington]

So many people do not like the AJS brand any more but for me I love my little bike.

AJS Daytona MK4 2019

The bike is Fuel injected

Now my problem is whilst accelerating past 2nd my bike jerks and stutters and just bottoms out around 1/4 to 3/4 twist on the throttle.

Once I open the throttle fully the revs climb and the back actually moves, I am a novice when it comes to engines sadly and only know a few things to check.

Now what I have done is stripped the air filter / injection parts and cleaned them up, this however did nothing to change the problem

Next I tried replacing the spark plugs now this actually did bring back my performance it stopped everything for a day now its gone back to how it was

on only one of the spark plugs there was some slight burn marks.

If anyone can help me with a few things on where to look I would be grateful on your help

With things as they are due to Covid-19 its hard as hell to find a good mechanic who can help as all are fully booked

[dynax]

The only thing i can think of is the O2 sensor not working if it has one

[kezzington]

Yes it has 1 on each exhaust im just waiting on an EFI scanner atm to hook up to it so i can check all the sensors thank you for your input

[Snod Blatter]

Next I tried replacing the spark plugs now this actually did bring back my performance it stopped everything for a day now its gone back to how it was

on only one of the spark plugs there was some slight burn marks.

Maybe try a new plug cap? This is surely a large part of the problem, if not all of it!