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Discussion Starter #1
Hello,

I'm new here and I was wondering if you guys seen this mod yet. Click here: eBay item 2482306400 (Ends Jun-25-04 19:16:08 PDT) - Power Tip for Yamaha Grizzly 660 and Rhino 660 Exhaust. I purchased this item and it really improved the grizzly with more zip and get-up and go! Also what a great throaty sound now. I didn't have to rejet and since I purchased this tip I have put on over 100 miles with it without any problems. I just wanted to share this mod with you guys in case some of you are looking for that little added pep to your machine. For the $40.00 I paid I think it was a great investment.
 

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I bought one of those not long ago also. I put that tip on my grizzly, keeping the spark arrestor and baffle in, and also putting in a Pro Flow kit with a K&N filter. my grizz sounds good now, a little deeper, and the throttle response is alot better now with the increased airflow.
 

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Discussion Starter #3
big grizz,

Isn't it amazing how much that billet tip makes a difference? I also recently installed an airbox mod on my grizzly which really seemed to give the beast somemore grunt power. Thunder Products sells these things called TPI valves. I purchased two Lowboy valves from them and they mount on the top of the airbox lid. Simple to install by just cutting two 2" square holes in the plastic lid and screwing them down into place. The valves can be now adjusted to wide open postion or halfway or closed when doing a deep water crossings. I tried them for the fist time last night when we rode, and all I can say is WOW. I couldn't believe the new added raw power that these two little valves created on my grizzly. I have not rejetted the carb and the machine seems to be running fine as is. The added extra air flow seemed to do the trick for my machine. For the price of the valves I personally think it was a wise investment. I can honestly say it made a big difference in the way the grizzly hauls ass now. At least in my case, I am happy with this mod and for the price I couldn't be more thrilled.
 

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Discussion Starter #5
JPGrizzly,

The TPI valves(lowboy) were $39.50 for two plus shipping. You can check them out at WWW.thunderproducts.com
The billet exhaust tip I got on ebay for $41.50 plus shipping. When you go on ebay type in "items matching yamaha grizzly" you will see the billet tip on the second or third page. I hope this helps.
 

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I have been talking to someone that has the TPI lowboy valves installed and they have said that they are water tight when closed keeping water out on normal stream crossing and water splashing up. But if you are always running in water over the top of the airbox lid he would not suggest installing them because they are not designed to be completely water tight under pressure. If you are going to ride underwater allot it would be a good idea to have an alternate airbox lid for those rides.
 

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Discussion Starter #8
JP

dknard is correct on this. The valves are not completely water tight when submreged under water. As for normal riding situations, crossing streams and brooks etc, they are fine. Where we ride here there is a beaver dam we must cross on the trail. The water is up over the tires on my grizzly and after I crossed it with the valves open I stopped and checked if water had gotten in and all was fine and dry. Keep in mind I didn't fly thru the crossing just eased thru it. If I was planning on flying thru I would have closed them off. Also when I installed them I used silicon seal under the lid where the valves come thru just as a precautionary measure.

So in essence they are somewhat water tight when closed but I wouldn't suggest playing submarine with them either. Besides, if you look where the stock snorkel is on the airbox it's only 4 inches higher(if that) then the lid anyway. I believe if you are that deep in water to cover your airbox lid you're asking for problems anyway. just my opinion...
 

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Regarding the billet tip. Do most people put the spark arrestor back into the muffler? If so, do they have to weld it in place? If placed back in the muffler, does the spark arrestor meet USFS requirments. I would like to try this out!
 

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Discussion Starter #12
WildBarry,

I did put the original spark arrestor back in, as required by law. All you have to do is grind or drill out the spot weld in the stock tip and it will come right off. Then the three holes for the screws line up with the billet tip and you bolt it into place. It's an easy mod and only takes about 15 minutes to install. You will not need to weld the spark arrestor into place because the three screws hold it in place real secure. The billet tip I bought had a 1 5/8" wide hole for the exhaust, and now on ebay someone is selling a 2" wide hole in their tip and theirs is made from stainless steel instead of aluminum. Check on ebay under "items matching yamaha grizzly" you will find the two variations of these tips. Good luck
 

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Discussion Starter #14
WildBarry,

I will take some pics today of the TPI valves installed to give you an idea of how mine are installed. I used a Roto-Zip tool to cut out the 2" square holes, but a dremel tool will work fine also. It took me an hour or so to do the job.
 

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Discussion Starter #15
WildBarry,

I added the pics of the TPI valves on my profile. Check it out so you may have an idea of where I mounted them on the airbox lid. If you have any questions feel free to ask. Good luck.
 

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Thanks Blue Girzzly,

You have a nice looking machine. I bought the titanium edition - I really like the blue and the red. With the billet tip, have you ever considered drilling holes in the baffel? It's been mentioned in other atv forums. What are your thoughts?
 

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Discussion Starter #17
WildBarry,

Thanks for the compliments on my machine. I thought about drilling holes in the baffel but the more I gave it thought I realized it would be permanent and irreversible. I didn't want to modify something that I couldn't undo. Just incase I planned on selling the machine and a perspective future buyer wouldn't want to buy it. What is appealing to one may not be appealing to another so I left it alone. That is just my personal opinion. All the mods I added can be removed should a new buyer not want them. If I was needing more performance I would buy a after-market pipe and keep the stock one, so if a buyer didn't want it on, I could remove the pipe and put the stock pipe back on. For example, when I sold my 2001 kodiak the guy did not want the 589's I put on it. So I negotiated with him and put the stock tires and rims back on and I knocked off $100.00 on the price. Then I turned around and sold the 589's w/rims for $400.00 and made $300.00 more then I expected. Worked out great for me!
 

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I installed the power billet tip, k&N Filter, and TIP Valves. After installation, I rode the Grizz for about 30 seconds and pulled the plug. I suspected that there was something wrong because it ran like crap. The plug was white - it's running too lean. I guess I need to rejet.
 

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Discussion Starter #19
Wild Barry,

Maybe the combination of the K&N filter along with the TPI valves is causing it to burn way too lean. I didn't put a K&N on my machine just the tip and the valves and it runs fine.I also did a plug chop and the color was nice and right where it should be. I would suspect you need a re-jet also. Have you tried closing off the valves just to see if it still runs like crap? Also which exhaust tip did you end up purchasing? was it the 2" S.S one or the 1 5/8" alum. one? that also may have made a difference. As I stated above I bought the 1 5/8" tip.
 

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Hello I am also new to this forum with a new 04 grizz and 04 bruin for the wife.I have about 300 miles and after the 20 hour break-in I'm able to let er rip abit more. I have ordered a K & N air filter & the stainless bellit both from ebay and was wondering if I would have to re-jet. I ride in the Arizona desert but am fortunate enough to have a huge sandy and wooded river bottom 1/2 mile away, no trailering. Also I wanted to share that I have not had any over heating problems or gas boiling. I haven't been on any slow tough trails though.
I have riden in 100 degree weather for an hour or two but my speed has been from 15 to 50. Sorry for the long reply just wanted to get alot in.
 
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