Hello all. I have a 07 Grizzly 350 IRS 4X4. So far I have added the K&N replacement filter with Pre-charger wrap. I'm looking for more top-end speed. I have in mind a FMF Powerline muffler, FMF Jet kit, and the Hauck machined sheave. Do you think that adding all of these will give me more top speed? Will any of those mods take away from the top speed? Any other suggestions? THANKS!!!

 

all of that sounds pretty good, but i would try an oversized carb and mabye changing the rear sprocket for one with few more teeth for top speed...

 

The rear end might be a tough one to find, and I might lose some rear wheel torque. My biggest concern is putting all this stuff in, and even though it gets to top speed in a shorter time, it's not actually any FASTER you know? That's why I'm not going with a clutch kit like EPI.

What are some of the Wolvy 350 guys doing for more top speed?

 

You already seem to realize that by doing this you really aren't going to gain too much....

Unfortunately... you aren't going to get too much more out of that 350 as far as top speed goes... even with all that fancy Muffler / Jet Kit / Sheave... you MIGHT get 5 mph on the top end.....


Also there is no "Rear" sprocket to change as this is a shaft driven IRS ATV

 

double post

 

Save your money and trade the quad in on a more powerful one. Or sell it yourself.

 

<div class="FTQUOTE"><begin quote>Originally posted by: HeftyLefty

Save your money and trade the quad in on a more powerful one. Or sell it yourself.</end quote></div>

I knew that was coming!

5 more mph would actually make me really happy. Any more than that and I'm liabile to really hurt myself. Where I ride it's more technical, so it's nice to have a smaller narrower bike, but I like the idea of squeezing everything I can out of a motor.

Thanks everyone.

 

Of course that was coming.... This isn't the days of buying a wimpy 6 cylinder mustang and dropping in a fat 351 Stroker motor to gain crazy hp...

You probably should have looked at the Big Bear IRS 400 or the GRizzly 450 IRS... when you went to purchase your grizz 350.. I am assuming you bought it Brand new... Both machines are the same size as the Grizzly 350... in the case of the Big Bear IRS.. it is a 5 speed instead of the auto .. and comes with Mud-lite tires for a mere $100 more MSRP over the Grizz 350...

I ride technical and I love my Grizzly 450! I have full skid plate protection which takes a beating in some of the places I ride..

What is the top end of the Grizzly 350? 40mph? My Grizz 450 gets about 50-55 if I want.. I hardly ride it over 40-45 even if the big bores are doing 50-60...

 

The Big Bear and the Grizz 400 are an older design, both the 350 and 450 have the ability to lock the front axle, which I really like and sold me on that, but the 450 was at the time out of my price range. This is my first bike and I never rode anything ever before. I'm savin for a Grizz 700 (or what ever it will be in about 5 years) but until then I'm lookin for just a tad more out of the 350 until it gets sent to strictly snowplowing and field mowing duty. As for current top speed I can get it about 47-50 downhill, well that's where the speedo tops out, probably 40-42 on level ground.

 

<div class="FTQUOTE"><begin quote>You probably should have looked at the Big Bear IRS 400 </end quote></div>

The 400 Bigbear with the older 386cc motor is geared low and over revs at its top end of 45mph just like my 350 Big Bear did.

You really need to get at least the 401cc Yamaha,s found in the 400 Grizzly to hit the 50s.

My old 350 Big Bear,same engine 348cc engine as the Grizzly did everything well but on long straight logging roads it was to slow to keep up with the people I rode with and it bleed of too much speed on long inclines,and needed 1 or two down shifts for long hills that did not look like much .

Because your ATV is a Belt drive maybe a clutch kit would gain some top end for you.

5 mph is a big gain, If your doing 45mph and someone passes you doing 50 you will feel like your standing still.