How do u shorten a pipe?

[h400exrydr]

when i bought my ex it had a yoshi pipe on it. the guy that had it must have been ridin a wheelie and went a lil far back.this broke the grab bar. so now if i go a lil far i always hit the pipe. i just want to know how to shorten the pipe. should i jus take a sawzall and chop it down the middle or is there somethin special i ahve to do?thanks

[NacsMXer]

Do a search on "shorty pipe" this topic has been covered in detail in previous threads.

[lonestar13r]

i have a shortend yosh... i took a die grinder to it ... cut 4 1/2'' off.. line your end cap up ... punch the holes...drill the holes... put the end cap on ... polish pipe. rock n roll. i didn't have to touch my jetting...it didn't run much different. i only did it because i thought it looked cool and different. good luck...its not that hard to do. just make the cut strait so end cap fits up nice. -Ethan

[h400exrydr]

well for the holes dont u cut them off? i dont under stand that. i would figure since u r takin the end off the places where the bolts would b gone. thanks

[lonestar13r]

yeah, you do cut them off... i ment drill new holes in the remaining can you will be using.. to hold the end cap in

[capecod400ex]

when I did mine i used a metal chop saw so it was straight.

[h400exrydr]

ooooo ok. thanks guys

[h400exrydr]

when i do this...this wont hurt the engine will it? i have brand new kibble white valves. will i be alright?

[rebelbanshee]

if you put the part you cut off inside your engine it will hurt it

b4 u cut u have to pull the inside of the muffler out and then cut or your coar will be to short.

http://www.exriders.com/vbb/showthread.php?s=&threadid=191481 sis some stuff

[hondarider2006]

I searched around for a few and found this. Hope it helps.


1. Remove silencer from bike.
2. Check to see if your end cap is screwed on or riveted on. In my case they were rivets.
3. Either drill rivets out or unscrew end cap.
4. Carefully pull silencer core out of muffler.
5. Unwrap any material that is left on silencer core.
6. Determine on the muffler how much you want to remove. I chose 4.5" on the R-4.
7. I used a cut off saw. But you may use a hack saw if thats all you have. Be sure to maintain a nice flat end. Easiest way of obtaining this is take a rubber band and place it where you are gonna make your cut. Then with a tape measure be sure to have the rubber band at the same measurement at 4 places around tube.
8. Then take marker and follow around rubber band. This will ensure a nice flat edge.
9. Take a round file and take off the burred edges being extremely careful not to cut yourself.
10. Now take silencer core and place inside of muffler tube.
11. Determine how much you need by placing it all together on a bench and for the most part eye up and mark where you should cut the silencer core to fit.
12. Most cores are spot welded on the core tube. Using a file or cut off wheel cut the welds holding it together. Be sure not to damage the end as it will be needed to mate the core and muffler later.
13. To cut the core tube your best bet is to use a cut off wheel. Unless you have very steady hands for the hacksaw. You do not want to crush the core tube screen.
14. Place core tube on end you cut off in step12.
15. Place silencer core in muffler to check for proper fit. Trim off more if necessary to get a good fit.
16. Once you have the fit you are looking for pop rivet teh end back on the silencer core tube.
17. Recheck fit to ensure no mistakes were made.
18. Now use new muffler wrap to insulate silencer tube. I like the thicker tighter material. Usually a little more expensive but I think it works the best. Be sure to wrap silncer tube tight and make it about a 1/3rd larger than the muffler opening.
19. Place silencer core and tube back in muffler. Be sure to get all material in the muffler as it may burn if let out while riding. I dont have to remind you what part of your body will burn first if it ignites......
20. Place end cap onto muffler and be sure to have the tip of silencer aimed at the ground or slightly to the outer part of quad.
21. Carefully drill holes through both being sure not too put to much pressure as you may dent the silencer.
22. Pop rivet holes one at a time. Meaning drill a hole and then pop rivet that hole. That way you dont risk making the holes crooked.
23. Replace silencer on headpipe and check for fit.
24. There might be a good possibility you may have to rejet. So be sure to check plug and mood of bike before you go nuts with it.
25. Go for a nice ride in the knowledge that you did it on your own and might of helped tick off your neighbors with the little bit of noise it created.

Good luck.

[h400exrydr]

WOW thanks alot for that...now itll b even easier.

for the coar i replaced it with a steal pipe that has no holes n it that way u can rev a little faster.

[h400exrydr]

hey Lonestar13r did u take out the inside of the pipe or jus cut the hole thing? also i could use some new packing, how do u change it? do u have to drill out all of the rivets?