Thanks for the responses. I’m sorry about the video not loading. I’m still thinking I’m missing something. I cleaned and set the exhaust valves to Yamaha specs (using a 3.5mm wrench), cleaned the carbs and reset the fuel screws, all three plugs are burning clean and equal. I just seem to be missing midrange power. I raced my buddies bone stock ‘06 Ski Doo MXZ 600 SDI and he smoked me off the line (he has a 1.5 ripsaw) and kept pulling away until about 400 or more feet then I seemed to gain a little before we let off. I don’t have much experience with Yamaha 700 triples, so I don’t know what I should expect. I just thought I should beat his 600. Maybe I’m wrong.
Above you said the power valves were set to 3.5mm spec...that's a typo right? You meant to say 2.5mm?
You shouldn't get smoked by a 600. What peak rpm are you pulling right now? Is it maintaining 8400-8500 rpm all the way through? In the right snow conditions the 600 with ripsaw may jump out on you off the line, but you should be reeling him back in at a fairly steady pace.
I think you have some clutching issues. At 8k miles some things are certainly getting wore out. Also clutching could've been changed by previous owner. Perhaps they haven't been cleaned in a long time...you wouldn't believe how much that makes a difference just in itself. I may be barking up the wrong tree and you have a lot of clutching experience, but above I see more talk about carbs than anything, so forgive me if you have a lot of knowledge and I'm out in right field. I think the most help could be offered by some of the clutching gurus here, such as MrViper. They are going to need some info:
1. Do you just want the stock components to work like they should? This will involve pulling the primary and secondary and inspecting for wear. At 8K miles it will be recommended to replace both springs, check roller wear in primary, check buttons in secondary, what wrap is secondary at, what does belt deflection look like?, and a good thorough cleaning. And we'll hope that gearing hasn't been changed.
2. Do you want a specific setup for your type of riding? Drag racing, corner to corner trail, etc. This will involve some different springs and different helix, possibly different arms for the primary and adjusting rivets. You're probably already going to be buying springs, for another $100-$150 you can pick up a helix and some primary arms (probably from this site's parts thread) and have something that will pull a lot nicer than the stock configuration.
Just clean clutches can make a world of difference. Years ago I bought a used 93 Exciter ll sx. I mistakenly assumed the dealer place that had taken it in trade would have gone through it and cleaned clutches, etc., so I just took it right out as is that weekend to ride. My riding buddy had a Phazer at the time, it was originally a 121 that he had put a 129 on and geared it down to pull the extra track. No other mods. My Exciter was very rich feeling in the mid range and even fouled a plug once. When we lined up to drag race and compare, he smoked me pretty hard off the line and then maintained 2 lengths on me through 500'. We both knew that shouldn't happen. That week I went through the Exciter, cleaned carbs and lowered needles a notch. Then went through the clutches which were very filthy...we're talking belt strands filthy. Cleaned it all up, no adjustments made. The next weekend when we lined up, it wasn't even close. That Exciter just flat walked away.
