Are you in the U.S.?....  There are no 93' models..... 89' to 94' none...
86' to 88' is a #155 main...

I doubt it...
Do you think you're running lean?...
If you do, you may have an adjustable needle jet.  Early models here did... It will allow you to adjust the needle jet by moving a c-clip,... which will richen you up a bit and might boost acceleration.. if you need it.  Assuming you're lean now.... or, it will make you sputter and smoke under acceleration if you're not.  
Costs nothing to try, but a little work..

On a stock bike,... a #155 main is pretty hefty... I'm running a #150 with a filter and muffler mod...

Just jetting to match... Proper jetting depends very much on weather, elevation, and temperature.... but I would think the main jet is O.K.
Try adjusting the needle clip,... drill out the idle mix plug and adjust that,.. if you need more than three turns out from fully seated, go one step up on your pilot jet.  

Here's some general tips on tuning your carb....
In general...

hotter  air = go leaner
more humidity = go leaner
higher altidude = go leaner

cooler air = go richer
less humid = go richer
lower altitude = go richer


Barometric pressure effects jetting in a big way, humidity, air temp, and elevation.  Some places have extreme  variations in barometric pressures and if you live there, your pipe will blue.  I live in the high desert and temps can change 40 degrees f in a couple hours, humidity can vary wildly too.  No way to jet for that.  

A good indicator of overall jetting is the weather...if popping/backfiring increases on humid days, or at higher elevation, that indicates rich....less popping on those days indicates lean.

To test the main, accelerate from 30 or 40 mph, in 4th or 5th gear at full throttle for several seconds, then reduce throttle by about 1/8,...if power increases for a second, you are lean on the main jet.  Go up one jet size and test again.  Do testing on an average day,... not too hot, wet or weird...

jabman wrote on 07/17/09 at 04:09:05:



If you are int he UK you are getting pissed on all the time. You have different weather so you are probably jetted for those conditions. Uk in general has a cooler, more wet climate. I would think that is the reasoning for a more rich jetting from stock.