I need to know the model and size (in mm) of the carbs used on a 1998 gs500... any help would be appreciated.

I couldnt find the carb model number but I found the part I was looking for... I do have one more question though. On the carb rejetting page it says to use  No. 4 washers. Well I have looked around and noticed that not all No. 4 washers are the same thickness, some are .025in thick and some are .032in thick. What are the correct size washers I should be looking for?