I just got a new cylinder stud for my 2002 TOMOS LX and after putting it on and torqueing down in a criss-sroos pattern at 10 ft/lbs, i was not able to go faster than 35 mph in which before hand, i was able to do at least 40. The problem is that when I hit 35, the engine starts to studder and be on the verge of 4-stroking but doesn't completely 4-stroke. When I go down a hill, it 4-strokes. So, I am thinking it is a problem w/ the needle in the carb or something in the electrical. My jet size is correct so I know it is not that and I did blast every part of the carb I could get to w/ carb cleaner except the needle. Also, I did wire up a key ignition switch 8 months ago and used thin speaker wire for that but I don't think that is the problem either. So, any input on what the problem is would be nice.