Utility Performance / Technical info Utility ATV Performance and Technical Discussions about specific mods, engine upgrades!

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Old 03-12-2011, 01:13 PM   #1
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more power for my 09 550

looking for some input on getting more out of my 09 550. its stock other then new maxxi bighorn tires,but when it comes to hill climbing and running in snow it just needs more mid/top end. i have read somewere about the clutch being weight'd heavy and i have read about the muffler mod but where i ride i need a spark arrester. so i'm looking for ideas i guess so it will keep up more with my 700
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Old 03-12-2011, 03:23 PM   #2
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sell the 550 and get a 700 !!!!

thats how you make a 550 keep up with a 700

i ride with some 700s and yes if we are going hard up a hill i will drop back some because i dont have the power but then we dont go fast very often

you could pipe it clutch it and snorkel it ( thats what i did ) and it will keep front tires in the air good its just top end power on hill that slows me down but it no biggy to me

the thing i like about the 550 all the guys i ride with got 700s and 800s when they are looking for fuel ( or running out ) i got half a tank
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Old 03-12-2011, 08:23 PM   #3
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If your not hitting your rev limiter you could try running 3.6s instead of 3.1s to help with that low end grunt and its going to keep you running in a better rpm range. Other wise you could do the fixed plate mod which will give you a few more mph. If you need to keep your muffler stock for spark arrestor purposes you could go with a HMF exhaust which is USFS certified so it is legal on the trails. Otherwise running 2" snorks and a power commander to compensate will help get you more power. All of these will help but your at a 150cc advantage so you'll never be able to go toe to toe on top end but better low and mid range will help you on the trails to pull away in the tight stuff and maybe you'll have enough lead by the time you hit the straight aways to make em play catch up..lol. The 550 is a great machine with better gas mileage than the 700s but the cc disadvantage means theyll run away way up top
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Old 03-12-2011, 11:18 PM   #4
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If you add more weight to the primary you will increase the time it takes the engine to increase RPMs. It will run a slower RPM at higher speeds but will lose bottom end power because engagement of the belt comes in sooner, at lower RPMs and further from the power band. It should also help the engine hold RPMs once its up there, similar to an overweight flywheel in a Jeep or whatever. I don't know how effectively that will work because I've never tried it.

If you reduce the weight in the primary it has the opposite affect. Increasing the rpms and delaying the primary's shifting adds to the bottom end and improves acceleration. It can also help the engine's ability to continue to pull in the sticky stuff if it's tuned to run in the power band. Reducing the weight also costs on the top speed side of things. I don't know of anyone who has increased the primary roller weight unless they change secondary settings.
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Old 03-13-2011, 09:48 PM   #5
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Yeah, I went to purchase an 09 550 LE new and walked out of the dealership with the 700 H1 LE and never regretted it. It was only a few hundred bucks more and it you think about it, its probably cheaper than adding mods to the 550 to wake it up.
The only suggestion I can give you is the airdam clutch mods, everybody says they are the cats meow.
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Old 03-14-2011, 04:08 AM   #6
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i got my 550 because it was under 8000 and the 700 was just about 10000 so it was much cheaper LOL

tonight i did some clutch work to mine and

i have snorkels exhaust work airdam stage 1 and now the secondary is clocked to B3 and it turns the 29.5s way better than it ever run before with stock tires it will wheelie in 4x4 high easy and pulls hard all the way to top speed

yes my topend is no land speed record LOL but my riding is never over 40 mph topped out now with the clutch work its right at 50mph on the speedo gps will be different
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my custom made rad kit
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airdam //// stage 1 rollers 19g and secondary on B3
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Old 03-14-2011, 10:27 AM   #7
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 Quote: Originally Posted by WaRiderTfT View Post
looking for some input on getting more out of my 09 550. its stock other then new maxxi bighorn tires,but when it comes to hill climbing and running in snow it just needs more mid/top end. i have read somewere about the clutch being weight'd heavy and i have read about the muffler mod but where i ride i need a spark arrester. so i'm looking for ideas i guess so it will keep up more with my 700
Don't ride with 700"s and you will never have this problem LOL just teasin! It would be cheaper though
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Old 03-16-2011, 08:31 PM   #8
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thanks for the info guys i think i have a few ideas what direction im going in stage 1 cluch mod , muffler mod with spark arrester in tip,and maybe try B3
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Old 03-16-2011, 09:01 PM   #9
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 Quote: Originally Posted by WaRiderTfT View Post
thanks for the info guys i think i have a few ideas what direction im going in stage 1 cluch mod , muffler mod with spark arrester in tip,and maybe try B3
Since you want more top end i would highly recommend going with stages 1&2 just because the fixed plate mod will give you a few more mph on the top
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Old 03-16-2011, 10:16 PM   #10
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Yeap thats what i was going to say 1&2 to get max lowend and make sure you keep your topend as well.
I would keep your secondary spring stock and after you do stage 1/2 and you want more I would then lighten the rollers up, 4-19 grams to go with your 4 stock 21 grams and then see what kind of rpms its turning after that.
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