How to get MORE POWER & the whole fuel selection

[mariomp]

Hey guys, I'm new to this forum; hope I'm posting this in correct location.
I just got my second Grizz after my '99 was stolen from my driveway. I like all improvements Yamaha did on the '05 from the original 98-99 models.
I've read several posts about popping wheelies and I could never do it with my 600 or with this 660.
Both beasts were stock and now that I have this 660, I'm wondering what I could do to make MORE POWER.
I live in New Mexico and ride on average at 4000-7000 MSL. I read good and bad about aftermarket air filters (K&N, etc) so I don't know if I should get one (had it on the old one, still couldn't pop the wheels). I asked my local dealer about jetting; he said "if it isn't dying or hesitating when you first get on the throttle then you're fine". I asked him if getting different jets would improve things anyway, he told me that anything is possible, but its really a guessing game without dyno and unless I know my bike well and test it pre & post with exact same road, altitude, time, temp, humidity conditions, that I really wouldn't know. I don't want to spend the money buying different jets never knowing what is what.
Here is another, thing that has me wondering things. I've got 87, 89 & 90 octane gas available here in New Mexico. My truck takes 87 and is happy, but I've always used premium gas in my toys & tools (lawn movers, tillers, etc). Friend of mine (who races cars) said that he uses 86-87 in his bikes 'cause octane rating is resistance to burn (or something) and at this altitude we have less air so getting high octane gas is a waste of money. I read a bit about it some time ago, but hell, I don't know...

So to re-cap:
* How do I make more power on the cheap
* Do I want to spend the money on aftermarket air filter or is it going to cost me more in repairs then the power gains
* How do I jet without spending too much to jet it (is there a chart)
* What gas do I use for higher altitudes and dry climates

Great forum,
thanks for any/all answers.

Mario P.

 

[MrSled]

You can get some throttle reponse out of a K&N Kit but very little top end power, The best thing that we have found is more spring on the Secondary or a shim under the spring to help hold the shift back to let the Grizz wind out more.

 

[clutch]

At your elevation you can most likely get by on the stock jetting. You can drill some 1in holes in the edges of your air box lid and let in a little more air. If you don't run in deep water that will make a difference at higher altitudes where you would need more air and smaller jets. If you do get to deeper water you can always tape over the holes. I tape mine when riding in powder snow to keep the filter from getting ice on it in cold weather. A good pipe will also make better low end/mid range power but it is more costly to go this route. I have the holes and a pipe on mine and it runs very good up to 45-50mph. Top end is about the same.

 

[Grizzhopper]

Instead of drilling hoels in your airbox lid, consider TPI calves instead. You can seal them up in a few seconds with the trapdoor they come with.

I use them and they are a great product. It beats the Uni Vents.

Take a look.

http://pg.photos.yahoo.com/ph/grizzhopp ... pg&.src=ph

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Moving more air trough your engine will allow you to introduce more fuel. If you rejet to get the ratio corrected for your elevation, you will have more power.

Someone else cannot tell you the exact jet required, because there are soooo many variable parameters to consider. We can get you in the general ballpark, but you are going to have to work at getting it "RIGHT"

Octane will not be an issue for a stock piston and even for a higher compression piston until you get up into the very hagh range above 10.5:1. Regular gas will do great. Just avoid ethenol whenever possible

A pipe will be the easiest bolt on performance mod you can do, BUT... You will still need to rejet if you want to get the most out of it.

Any mods you have planned for your Grizz that alter the airflow will affect the jetting. Keep that in mind as you purchase parts. If you put on a pipe tomorrow and rejet, then you install a K&N filter, you may need to rejet again.

Plan ahead to save yourself a lot of work.

 

[mariomp]

Thanks for the info.
I tried the holes in the air-box thing by removing the whole air-box and I still can't pop the damn thing.
It seams like it takes engine almost a second to start winding up, by that time Grizz is already rolling and won't wheelie.
I checked out eBay for the jets and am confused about what jet I need. Some auctions caution about buying just a single jet stating that main jet is not the only one that's needed. I also read here that I may need to try several different sizes. What am I looking for and what sizes should I start with, or is there a kit that has them all?
BTW, I also tried the foot on the rear rack and pop the handlebars, but with all of my 150lbs, that's not even a quarter of Grizzly's weight.

Thanks to all for ideas,
Mario P.

 

[Octane]

I would go for the foam air filters over a K&N. In my opinion, the K&Ns just dont filter as well as the foam filters do.
You could also look into an aftermarket exhaust. A lot of companies that never gave the utility quad market a second look are now offering some really nice slip-ons for utility quads that supposedly make their power down low, where you can actually use it.
Cap'n

 

[CHolloway]

How many miles are your machine. I purchased a 2005 SE Grizzly in February this year and found that the response was the same as your have described. I now have over 500KMs on the machine and now find it will wheelie on command.

FYI - I am somewhere between 100 & 500ft above sea level when riding.

Everything is still stock. I am planning to put 26" ITP Mudlite XLs on next week which may steal a little of the power. Hopefully not to much.

Regards

Chris