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grizzly 660 air box mod questions

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13K views 19 replies 7 participants last post by  reogem  
I'm not sure I follow, how do I set my pod? I'm not sure what that is, nor what my screen is? I was under the impression it was as simple as removing the stock filter and guide and then installing the pieces like the link I posted.

everyone in those threads seemed to be referencing 700s?
That post was for the 700. That thread does not apply to your 660. So just don't follow it.

Your Highlifter link is the correct method of modifying the 660 Air box and installing a clamp on style filter. I have this exact setup done to mine as well. Very easy and fairly cheap. I think I paid $8.00 for my Spectre filter plate at a local automotive performance shop.

After you have your box modified and the plate ready to be bolted to the box, apply silicone to the surface and to the bolts themselves. All the details are in the Highlifter thread. The computer drawing shows all the details needed......except for one slight detail. In that thread the guy used some rubber to seal the plate to the box (with silicone). This simply is not required. Once you start at it, the whole thing will make more sense.
 
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You don't need to rejet with this filter installation. Your only changing a filter. Not upgrading a complete intake system.

Ridgway, this mod is not really about getting more air to the 660 engine. Its more about installing a better filter design (clamp on style), to help save the engine from taking in unfiltered air.
 
I originally bought that plastic intake but after inspecting it I had a feeling it would distort from the hose clamp. So after much research I found a heavy duty aluminum flange for under $10 delivered and it works great for my 2016. Its under several model names but one is ebay # 310751207629. I now use a clamp-on unifilter and eliminate the dust risk with the garbage stock one.
Nice find. This is what we want to hear. Thanks for sharing it.

I would like to add though. The plastic adapter would of worked fine. You do not need over tighten the clamp. You only need it snuggled up enough to secure the filter. That's all.
 
So I did this mod about 14 months ago. I don't ride it much other than around the house and took my first decent length ride (~15 miles) in april and checked it when I got home. I found the gray plastic piece had melted and my filter was barely hanging on (BOTTOM PICTURE - sorry theyre out of order)


replaced the plastic piece and the very next ride on it probably 4 months later (around some buddys short trails) is when i noticed the bike running like shit. backfiring, not wanting to cruise at an idle speed or it would stall. I got home and noticed the plastic piece had began to melt again. i tightened it up and cleaned the carb, noticed the black plastic thing in the back of the carb had gotten hot and stuck open - so I sanded it down and cleaned everything again and it ran fine.

then it started running like garbage again and i was again trying to diagnose the backfiring and running like crap issue for awhile so I had cleaned the carb, drained the gas, etc. and found the plastic piece had stuck in the open position again. when I was running it in the yard trying to figure out the issue i apparenlty melted the air filter at some point from it backfiring??

either way i could have caught things a little sooner - but I had nothing but problems after I did this mod to my bike 0/10 would not recommend it was a giant waste of time. perhaps everything was coincidental but I had the bike for a year and did twice as much riding that first year than I did the entire time I had that slip on filter mod. cleaned everything up last fall after I found the second issue and it ran fine with a stock filter.
You have a problem with your bike. Could be many things, but more than likely valves are tight. The airbox mod is not your problem nor will it cause a problem.

Think of it this way. There is thousands of people out there with this airbox mod (me included), who have no issues. You had yours melt and your blaming the mod? Your looking at it incorrectly.

How about we try to help you fix the underlying cause and get you back to riding with a 100% properly operating bike?
 
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