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More Power for the Grizzly 350

This is a discussion on More Power for the Grizzly 350 within the Grizzly Engine & Transmission forums, part of the Grizzly Forums category; Went on another ride this weekend with my brother. He owns a 2008 Grizzly 350 IRS which to put it mildly, lacks a lot of ...


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#1
08-31-2009, 08:57 AM
More Power for the Grizzly 350

Went on another ride this weekend with my brother. He owns a 2008 Grizzly 350 IRS which to put it mildly, lacks a lot of power. I've put in a lot of seat time on 300s, 350s, 400s, etc. with other brands, and IMHO the Grizz 350 has to be one of the most under-powered mid-class atvs on the market. Obviously, he is looking to improve performance. If anyone has any tips for him, let me know and I will pass them along. I've already gave him my opinions, but I want to hear other peoples.
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#2
08-31-2009, 02:08 PM
Check my garage if you want to see what I've done with mine, its a 2wd but I have done enough I think that has helped it out. I am in beginning of doing a conversion to 4wd so I'm sure it will be different once I get this done in comparison to the 2wd performance.
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#3
08-31-2009, 05:39 PM
I use to have one it was junk slow and no power thats why i BOUGHT A 700
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#4
08-31-2009, 08:44 PM
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Originally Posted by SHOOTER View Post
I use to have one it was junk slow and no power thats why i BOUGHT A 700
It's slow and underpowered, but it's not junk.


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Originally Posted by Grizzly Ed View Post
Check my garage if you want to see what I've done with mine, its a 2wd but I have done enough I think that has helped it out. I am in beginning of doing a conversion to 4wd so I'm sure it will be different once I get this done in comparison to the 2wd performance.
Thanks man. I will pass this along. Nice mods BTW!
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#5
09-01-2009, 12:12 PM
I have one and the thing is solid, but yes, underpowered. My wife rides it now and is more than happy. It always did what I asked of it.

I did the carb spring mod and that helped. The next thing I want to do to it is the shim mod. The machine has planty of power once it gets going, just needs a lower gear to start.
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#6
07-27-2010, 12:21 PM
I have a stock 2008 yamaha grizzly 350 4x4 solid rear axle and i am getting a snorkel kit for it to go mudding, but i was wondering if i could get a lift kit and bigger tires without losing performance in the mud. or what could i do that is semi cheap to give it more power
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#7
07-27-2010, 04:19 PM
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I have a stock 2008 yamaha grizzly 350 4x4 solid rear axle and i am getting a snorkel kit for it to go mudding, but i was wondering if i could get a lift kit and bigger tires without losing performance in the mud. or what could i do that is semi cheap to give it more power
We put a 2" exhaust tip, UNI filter and added 3 450 Grizz weights to make a 3-350 and 3-450 clutch weight setup (good trail riding setup). He is still running stock tires and wheels and the difference in power is noticeable. In all, he probably has under $100 in performance mods and I would recommend that anyone with a 350 Grizzly do these simple mods. In addition to this, a re-jet of the carb is needed. We just haven't got around to doing it yet on his. And to answer your question, yes. Bigger tires would certainly have a negative impact on the power...as it would for any machine.
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#8
09-03-2012, 10:12 AM
Did you convert your 350 to 4wd? I have one and I'm planning to do the same thing. Can you share your experience? How much have you spent? What parts you need? Thank you in advance.
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#9
09-08-2012, 03:39 AM
what will the 450 weights do for the quad, I'm also wanting to get some more power out of my 350. does it give a lot more bottom end. I'm looking to do some clutch work a new pipe and a re-jet so i don't run lean.
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#10
09-08-2012, 10:44 AM
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what will the 450 weights do for the quad, I'm also wanting to get some more power out of my 350. does it give a lot more bottom end. I'm looking to do some clutch work a new pipe and a re-jet so i don't run lean.
The best thing you can do for the 350 for power is a shim. Primary Shim Having lighter weights will keep it in low longer, but the RPM will run much higher.
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#11
09-10-2012, 04:51 AM
Is there anywhere other than eBay to get the shims for the cvt. What is the Carb spring mod
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#12
03-19-2013, 09:43 PM
i have a 2011 350 grizzly.i open up original exhaust k&n air lid off #20 pilot #133.1 main jets.it runs great.wood some 450 rollers and blue secondary spring help?i really need to soon.bucket/im gone****
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#13
03-31-2014, 12:06 PM
I put a 136.3 main and 35 pilot end off pipe it help it some.
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#14
12-10-2014, 07:49 PM
Grizzly 350 Irs mods

Hey Guys-I flip about 1-3 quads a year. Buy on CL, rebuild or whatever and move them out. My son and I only ride yamahas, but i occasionally will build a polaris. I have a soft spot for something kinda american made i guess.

Nothing goes out of my garage half assed or rigged. I am 52 and enjoy putting things back together correctly. So I have just acquired a 08 350 irs. Needs a bottom end, which i have purchased, and will freshen up the top end while i am at it. I know, its just a 350, but i have rodded a bunch of warriors.

I have read with interest the clutch mods-i have seen use 3 450 weights and use 3 660 weights....which? Running stock light tires/rims. Will pipe this and jet it in the process. Will a 2mm big bore warrior piston fit? Hot Cam stage one? I only got 500 bucks in this thing dont mind throwin a few xtra hundred to help Thanks!
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12-11-2014, 09:09 AM
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Hey Guys-I flip about 1-3 quads a year. Buy on CL, rebuild or whatever and move them out. My son and I only ride yamahas, but i occasionally will build a polaris. I have a soft spot for something kinda american made i guess.

Nothing goes out of my garage half assed or rigged. I am 52 and enjoy putting things back together correctly. So I have just acquired a 08 350 irs. Needs a bottom end, which i have purchased, and will freshen up the top end while i am at it. I know, its just a 350, but i have rodded a bunch of warriors.

I have read with interest the clutch mods-i have seen use 3 450 weights and use 3 660 weights....which? Running stock light tires/rims. Will pipe this and jet it in the process. Will a 2mm big bore warrior piston fit? Hot Cam stage one? I only got 500 bucks in this thing dont mind throwin a few xtra hundred to help Thanks!
Welcome to the site from Arizona!

CVT:
With the stock tire size, get a green EPI secondary spring and shim (eBay) to your liking (total ~$40). Try this first. Mess with the stock weight setup only if you are not happy with the CVT after the spring + shim(s) + motor mods below. I would avoid using the high stall wet clutch springs from EPI because the stall speed becomes too high for most folks.

Motor:
UNI filter, cut 2-3 coils off of carb diaphragm spring, slip on muffler if you like it louder, and re-jet. There is a Wiseco 11:1 piston available that you can get in +2mm bore, but no larger big bore kit to my knowledge. The 350 Grizzly shares a piston with some of the race/sand bikes but the rod & crank are different so no stroker kits either. I am not aware of aftermarket cams available but I wouldn't think that swapping for a race/sand grind would be the best idea even if one did interchange because it would likely shift the power band too high for effective use with the CVT and the way most people use a 350 Grizzly. Maybe someone else with cam experience can chime in here.
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