HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
MX926

2008 Muffler Packing Issues

5 posts in this topic

-I just wondered if anyone else has had trouble with the packing in the 08 450.. Mine lasted about 3 weeks of hard riding, I repacked it, and had the same result.

-I then switched to a shortened 07 muffler, bike ran great, better performance, but same problem 3 weeks and no more packing left.

-I'm currently running a stock 07 muffler, and have no packing problems, however i would like to run the shortened 07 muffler becuase of the performance characteristics.

-I'm wondering if my jetting is affecting the exhaust temperature? My muffler is a nice gray color, and the bike seems to run great jetting wise. I mix 1 gal of power110 race fuel with 4 gallons of 93 octane. My jetting is:

168 main

45 pilot

clip in stock #3 position

Fuel screw 1-1/2 turns out

Bike is completely stock

I'm in minnesota where its been upper 70's and 80's.

And the packing I'm using is FMF 4-stroke packing, which I have used previously and had no trouble.

-Anyone have any suggestions?

Share this post


Link to post
Share on other sites

If you can get 93 octane in your area then IMO you are wasting time and money on the race fuel. Your jetting should be OK. The 07 muffler is a much better exhaust but you may not be packing it well enough. If you are using the stringy style packing the only way I could ever get it packed tight enough is by taking off the end cap and packing it around the baffle. It is a little more work but will last longer. The best way is to buy a cartridge style packing like a lot of companies sell now but they are alittle more money.

Share this post


Link to post
Share on other sites

I've tried packing it super-tight, and I've have packed it in a normal manner. Both however seem to bring the same result. The packing I'm using is fmf 4- stroke which comes in non-string type. As far as the race gas, it seems to make everything a little crisper, and I'm getting a super good deal on it, otherwise I would just use pump gas.

Share this post


Link to post
Share on other sites

168 seems rich for an '08, but the race fuel may be oxygenated enough to need that.

I have had poor luck using FMF packing in my son's DRD exhaust , and solved the problem by using the DRD packing cartridge. It is vastly easier to use (not to mention the reduction in loose glass fibers in/on your clothes), and has outlasted enough FMF repacks to have made up the difference in cost.

The '08 muffler is going to be hard on packing because the internal baffling forces a greater amount of exhaust gas into the packing.

Share this post


Link to post
Share on other sites

i had the stock pipe on my 07 for quite awhile and stock packing lasted about 30 hrs, and since i get no more then 10 to 15. i used fmf packing for awhile, but its garbage. i tried the moose cartridge style thats a little more money and bike specific and i got probably another 5 hours out of it, but it got to a point where re-riveting my pipe everytime was taking its toll. i've got a drd on there now and its about the same situation, every 10 to 15. how hard you're riding does affect it i think, but i guess just live with it, thats what i've come up with

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0