hey i own a stock 350 raptor and i have a few questions. any help wil be wikked.

1) recently i would be driving with more than enogh gas, and my bike will just bogg out as if i hit rerserve(but i didnt) then it will snap outta it. somtimes it will bogg like that then backfire... is this a carb problem, does it just need to be cleaned? if you had this problem and know how to fix it please tell me.

2) i want to get more power out of my bike. is it posiable to get more top end and bottom end at the same time by changeing sprockets? or does it just have to be one or the other. if u own a 350 raptor and u changed ur sprockets can u let me know what size u choce.

3) i have about 300-400 bucks. what parts should i buy to make it a faster more powerfull bike. wheres the most "bang for my buck" as the old people say.

thanks.

 

Welcome to the forums.

When you change your sprockets your changing the gearing. It will either be higher geared or lower geared it can't be both. Most ppl I've spoke with drops one tooth on the front making it snappier on bottom end because, those 350's are a little too high geared anyway (IMO). For the most bang for your buck you'll want an exhaust and you must rejet. Get a pro flo kit or better filter so you can remove or put holes in your airbox lid.

 

HMF exhaust, K&N filter, jet kit, quiet core.

 

In my opinion stock gearing is the best all-around setup without any other modifications. It depends on how and where you ride though, so you have to decide for yourself what sprockets will work best. Base your decision on how often you actually reach top speed. If you get to top speed and feel like you have plenty of power to go faster, are as high as the bike will rev, you can benefit from higher gearing. If you rarely ever touch 6th gear then you may be able to get away with lower gearing. But in my opinion, lower gearing really doesn't benefit these bikes at all unless you're doing a lot lot lot of slow riding and really need the lower gears. Otherwise you really aren't accelerating any faster because you're spending more time shifting. More shifting = more time with clutch in and throttle out = slower acceleration. Keep in mind though, that if you change the size of your rear tires, they will have the same effect as changing your sprocket. Taller tires will increase your top end speed, and smaller tires will slow you down on top end just like a smaller sprocket will. Figure on about a 5mph difference with each tooth you change from stock. But realize that if you don't have enough power to pull that higher gear all the way to top, you may end up going even slower.

I personally run a 14 tooth front sprocket and 22" rear tires, which is equivalent to running a 15 tooth front sprocket with stock tires. But i'm making a good bit more power than a stock machine, so I have the extra power to pull the higher gears. A stock or lightly modified machine wouldn't be able to pull gearing this high except going downhill.

 

k thats for all the help guys, but does anyone have any ideas to my problem where my bikes i boging out and backfireing?

 

I'm not sure if the raptor 350 has it, but other yamahas commonly have problems with a sensor for the parking brake engaging when it shouldn't, which sets the rev limiter just above idle. You can try messing with that, but otherwise you'll have to take the carb apart and take a look. Could be a stuck float, or could just be a little piece of dirt that gets stuck in the jet and then falls back out.