Trophy 900 dies when throttle opened up

Probably totally stupid but are the coils deff ok?? If the rev counter drops and goes up again I know the feed comes from plug 1 so may be a culprit.
Sorry if I am a fuckwit,lol, Not a mechanic,just trying to give ideas

 

Crank position sensor can cause problems, although it usually manifests itself by cutting out the engine when it is hot and going back to normal when it has cooled down for a while.
I would also check the carb-inlet rubbers for leakage. Blow some 'Easystart' over each inlet with the engine ticking over - if the revs rise then you have a leak on that inlet. Allegedly, blowing WD40 over the inlet(s) has the same effect. This may be true. Or not!
You could also try richening the mixture slightly by using the choke lever to see if that makes things better. Again, it would point to a week mixture.
Could be some muck in the carbs, even if they have been cleaned. (Redex or similar could be your friend in this case.)
I guess you already have done so, but make sure all electrical connections are clean and sound, and disconnect whatever you don't need to connect up to run the engine. Just use the basic ignition system in case anything else is interfering with it and causing intermittent shorting out/voltage loss etc.
Just remembered an old trick from way back when .... if there is no air filter present, start the engine and then wap the throttle open and closed a bit sharpish, with your other hand covering the air intake to each carb one at a time. Allegedly this causes much suction through the carb jets and dislodges any debris that may be lurking therein.
Just a few ideas from Chateau Goolie Productions Ltd. (Usually total bollox, but hey, what the hell!!)

 

double check pilot jets. Some confuse the pilot jet with the air screw.

 

Boothy when you changed the jets was it like for like or did you up size cos of the pod filters? ..just a thought

 

Mains are more flat out what about pilots and needle position

 

I bought a jet kit from sigma6 for mine it included mains 125 /pilots 45 if I,m right pilots deal with mid range.. On another note you can get carb cleaner aerosol that you can spray into carbs when running,that might clean out anything you've missed

 

Just had a thought,if your running off a remote fuel tank have you blocked off the vacuum pipe that should go to the back of the tap?

 

Here pic of vacuum take offs, two are covered with rubber boot one isn`t this goes to your tanktap, if running remote tank then the one without needs to be covered aswell. For experiment just cover hole with your finger, should give enough of a seal to test it

 

if/when you take the carbs off check those needle clips if one of them has dislodged it will run like a pig mid range,I had that before on a gsxr and it took days to spot it

 

I was always led to believe hesitation then revs shooting up as you release the throttle are usually an indicator of lean running....

But if the rev counter is playing up too then I'd replace one by one the things you changed before ie. Sensor leads coils etc.

 

Always a good way if you have changed stuff and got problems is to change everything you have done back to standard and check see if it runs ok. It might be lean with pods on but at least should run pretty clean. Then change main jets see if that causes problem, then pilots etc to see at which point problems start, just a suggestion, I have taken mine off dozens on times doesn`t bother me,rather be outside tinkering with bike than alot of people sitting inside watching crap on TV, that is unless it`s Six Nations Rugby then everything stops for that