CRSBear400
Posts: 5834
Joined: 6/4/2002
From: Haynesville/Minden, LA
Status: offline
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If you purchased the Dynojet Kit for your 300, the largest mainjet provided with the kit would be a 132 size. Next would be a 130. I ran the Dynojet 132 mainjet, Dynojet needle, and an aftermarket free flowing exhaust on my '99 300 with a 1.5" free flowing snorkel. My bike was tuned as perfectly as it could be without being put on a dyno. There was no "pop," "miss," or hesitation anywhere throughout the rpm range. I could turn 26x12/26x9.5 Vampires fairly well in thick mud. But, it would occasionally bog slightly in thick mud. When the Outlaws came out in 26" sizes, I purchased a set of 26x12/26x10's and put them on my bike. I made no changes other than tires to my 300. I could not pull the Outlaws effectively in the same holes where I could easily turn the Vampires. So, I traded the 26" Outlaws to a buddy for a set of 26x10/25x9.5 Outlaws. I had could turn this setup better, but it would still bog in a few places where the mud was moderately thick. It also wouldn't perform as good because the narrower tires on the rear. Eventually, I went back with 26x12/26x9.5 Vampires. Again, it pulled this combo better then any of the Outlaws I ran and was awesome in the mud! That's why I try to inform people that when you ride in truly thick, nasty mud or even thick sludge, the 300's will run into power issues with overly aggressive tires. There is a lot of hype behind the power and gearing of the 300 that simply isn't true. I've owned 3 of them and ran probably 20 different tire setups on them. I know what the won't do without going into the motor. No amount of backpressuer or jetting or air intake sizing is going to be enough to compensate for your loss of power. These mods simply add more throttle response and make the bike more crisp when you crack the throttle. It sounds like it is doing a lot more than it really is. I hate to say it, but you're either going to have to change tires or go into the motor.
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05 Mudstock-1st-IRS
06 Mudstock 2nd-0-400
06 Cypress Creek 1st 400cc/3rd 400-599
07 SkoolzOut Easter Bog 1st-501+up
07 Buffalo Gap 3rd-0-500/3rd-501+up
07 Spring MudFest 3rd 0-400
07 Can-Am Nats 2nd-0-400
08 C.M.R Mudfest 2nd 0-400
08 Bayou Mud Racing 3rd 701+up
08 PSR Texas Mudfest Pro A 1st R1
08 PSR Texas Mudfest Pro A 1st R2
08 C.M.R CanAm Nats Mud Drag 2nd
08 C.M.R. H'coming C3 Bog 3rd
08 C.M.R. H'coming SwampX C1 3rd
www.flickr.com/photos/cale_angela/sets/
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RE: I CANT TURN THEM!!!!! - 
Only other solution is to either get rid of the 12's out back for a set of 9.5's, or get a different tire on all 4. The thick mud you're in is only gonna make you pull your hair out trying to pull the Laws! I've been through this before with my 300. I learned the hard way. 
There is not much to be gained powerwise from these mods. The power will be crisper and it may rev better. But the lack of compression, torque and gearing is where both the problem and the solution can be found.