Trophy 900 dies when throttle opened up

Also have you checked the brass jets are still in the float assembly ? As in pic. Caused mine not to run so well. Without them it overfuels

 

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I think the holes are bigger to allow the slide to fall quicker so giving snappier throttle response, also with more flow through the slide assuming they raise quicker aswell. be interesting to see what happens when you get on the rolling road and how it fuels, with regards to jet sizes etc, Keep us posted sounds very interesting

 

Hi Quad, yes you are right, having had a 94" trident which I did the following mods - 1 opened up air box 2 K&N air filter 3 3 into1 open exhaust 4 drilled out those holes you are discussing 5 lifted needles, these gave me More Torque More Horse Power Quicker throttle response and a higher top speed, of all the mods 4 had the most noticeable effect (quickens throttle response) the T300's had CV carbies , CV stands for Constant Velocity, @ nearly all throttle butterfly positions the slide limits air flow speed's to a fairly constant speed ! Volume increases but the flow/speed stays within a set range ! This helps setting jet sizes, if the velocity changed too much there would be greater vacuum pressure sucking the fuel through the jets (flooding might ensue) engine would run too rich when throttle butterfly was opened too quickly or it would starve for fuel if jetting was too small, slide body and those vacuum ports smooth these effects out ( slows everything down) hence drilling them and adjustment of needles or jet sizes can increase power or response times.

Cheers capt.

 

Early bikes had the larger hole as described above increases response. Never heard about the one airbox flowing different to others. BTW the original filters were made by Piper X so were good quality.
If you get a dynojet kit a drill comes with the kit to open holes in the slides