Cleaning The Cat

[itsnt4me]

Seems that some folks say they didn't get much out of cutting the cat material out of their exhaust and that they got more benefit from drilling out holes in the muffler. I wanted to get some of the back pressure out of the engine but didn't way to go to all the trouble of cutting out the cat and rewelding if there wasn't much of a benefit but drilling holes out of the muffler canister would be a lot simpler. I got rid of my welding equipment because I have a pacemaker and can't be around welding so was curious what you guys think. Would like to keep the stock exhaust because I like the way it looks. And I am cheap.
http://www.chinariders.net/moz-extension://a56beb30-7985-4bdd-aad5-438d15219141/img/informenter-marker-1.pnghttp://www.chinariders.net/moz-extension://a56beb30-7985-4bdd-aad5-438d15219141/img/informenter-marker-1.png

[JerryHawk250]

Gut the cat and bring it to a local muffler shop to weld it back. Probably get it done for about $20. That alone was a huge increase in performance on my Hawk. I'm still running the stock exhaust.

[itsnt4me]

Gut the cat and bring it to a local muffler shop to weld it back. Probably get it done for about $20. That alone was a huge increase in performance on my Hawk. I'm still running the stock exhaust.

Did you also drill out the muffler canister?

[JerryHawk250]

Did you also drill out the muffler canister?
Yes, That help a little more but not as much as gutting the cat. You will also need to up the main jet to a 110 or 115.

[itsnt4me]

Yes, That help a little more but not as much as gutting the cat. You will also need to up the main jet to a 110 or 115.


For sure on the rejet. Just put a new NGK plug in a few minutes ago and I am already lean. Again thanks for the info.

http://www.chinariders.net/moz-extension://a56beb30-7985-4bdd-aad5-438d15219141/img/informenter-marker-1.png

[itsnt4me]

I am going to want to cut a window out and not cut the entire pipe. If you used the window method what tool did you use to cut it out. Dremel?
http://www.chinariders.net/moz-extension://a56beb30-7985-4bdd-aad5-438d15219141/img/informenter-marker-1.png

[JerryHawk250]

You could use a cut-off wheel on a small hand grinder.

[AresROC]

Hmmm, I like the cat, lol. Don't want to be too smelly like my GSXR, but since this is only a 250 maybe there is not smell?


I would drill out the muffler just for the deeper noise... anyone have resource on how to pull the internals out?

[Cravin01]

might help?

https://www.youtube.com/watch?v=LS78bIcetbI&t=1s

[roundhouse]

The hawk does not have the gas smell after removing the cat. At least not like my old R6. I still have the cat in my other bike as I get not wanting to smell like fuel after riding.

[JerryHawk250]

Unlike the Storm, the Hawk cat is single wall construction so won't be as bad to do as Paul's http://chinariders.net/picture.php?albumid=149&pictureid=834

[Cravin01]

I didn't know that, I sure would like to see a Hawk up close to see what is shared if anything? I was thinking maybe the tanks could be swapped so I could get a fuel gauge.

[timcosby]

Hmmm, I like the cat, lol. Don't want to be too smelly like my GSXR, but since this is only a 250 maybe there is not smell?


I would drill out the muffler just for the deeper noise... anyone have resource on how to pull the internals out?

when you open up the cat and see how restrictive it is you will wonder why it even run with it in and i have no smell on the hawk.

[timcosby]

I am going to want to cut a window out and not cut the entire pipe. If you used the window method what tool did you use to cut it out. Dremel?
http://www.chinariders.net/moz-extension://a56beb30-7985-4bdd-aad5-438d15219141/img/informenter-marker-1.png

cut a big window too cause that mother doesnt want to come out of there and welding the shitty metal is a bear. i chased hole with the welder till i got tired and ordered aftermarket.

[Biker_Andy]

Is the Cat under the heat shield on the Hawk too?

My TT250 has a long slight bulde under the heat shield and a big stubby bulde where the muffler attaches to the mid pipe. It seem bigger then it needs to be for just a coupling. I assume it's hidden under the heat sheild because it would be way too convenient to remove if it was in the coupling.

[itsnt4me]

Yes, That help a little more but not as much as gutting the cat. You will also need to up the main jet to a 110 or 115.

Just ordered a new carb and a jet set for when I gut the cat. Thanks Jerry you are a wealth of information and the rest of you guys.

[JerryHawk250]

Is the Cat under the heat shield on the Hawk too?

My TT250 has a long slight bulde under the heat shield and a big stubby bulde where the muffler attaches to the mid pipe. It seem bigger then it needs to be for just a coupling. I assume it's hidden under the heat sheild because it would be way too convenient to remove if it was in the coupling.
Yes it's under the heat shield on the Hawk.