2020 T-Boss 410 running problems

[downseast]

Hi everyone

Recently purchased a 2020 T-Boss 410 in what appears to be good condition

First time with this machine – I also have a diesel Kawasaki Mule which so far seems a better machine

It didn’t start and idle well particularly from cold when I got it and sudden take off ( now solved with new clutch parts ) was all or nothing !

I have replaced the idle valve, throttle position sensor, had the injector professionally checked ( ok) and also the pressure sensor this is a fuel injection engine, also plug and lead etc!

It still doesn’t run well and when starting I have to hold revs for a while as it wont idle but stall, thereafter its better and I have rebooted the ecu which has improved it

When I go to start it clicks as if there is a hydraulic lock and wont return after two or three attempts it then does turn over and start bit I need to give it a bit of throttle to start – is this normal ?

Is there adjustment for the air idle valve ?

The engine seems rough and with vibration compared to other engines I have been used to but some say this is normal?

I haven’t changed the Lambda sensor yet, anyone know how much difference this might make ( I have a new Bosch universal to fit )

Any advice very much appreciated, thanks