r304 shorty

I was just taking a look at my r304 shorty and there was some kind of flange about an inch into the end cap, you can feel that it creates a little reducer that would seem to block flow, its hard to explain but if you have one, rub ur finger down the end cap a bit and you'll feel it. now i was wondering on griding this down to make a smoother flow but don't know if it could hurt anything, im really worried that it may make it louder or sound differently?

the shorty has got to be the least restrictive silencer known. I wouldn't worry about it.

Mine has one of these as well. The reducer was added to help with top end power....No idea if it worked as I was not able to try a before and after.

Mine has one of these as well. The reducer was added to help with top end power....No idea if it worked as I was not able to try a before and after.

that reducer also helps make the engine detonate more.

its works on a similar principle to the SST pipes.

why would you want it to detonate? you guys are talking about the little flange that you can feel that would restrict the flow from the core going into the end cap? what results should i expect to see if i ground it off?

You would not want it to detonate. I think Bruce may be saying it was a not so great idea...

would i loose that much topend by removing it, and what is the sst principal?

Yea from everything Ive been taught... detonation isnt good! Maybe all my teachers were wrong though! :applause::):cry:

I've got a PC shorty along with a load of other silencers. It's my least favourite, it has quite tight bends in the pipe work and is restircted down to 23.5mm on the outlet. It's loud and loses overrev. The Dep is longer but 26mm on the outlet and much straighter pipework. Quiter and revs further. The stock 05 is 24mm on the outlet so bigger than the shorty. What you really want is the YRRD titanium silencer, 30mm tubing instead of 28.5 and and outlet of 26mm. Not easy to come by, luckily not impossible.....Yippeee

So where would one be able to find a yrrd silencer?? in the US

So where would one be able to find a yrrd silencer?? in the US

Yeah yeah

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

  • Similar Content

    • By MathiasJK
      Hi guys, I'm new here and bought a have 2001 a month ago and the engine is almost down in pieces, need the flywheel puller that's ordered and the parts needed for the rebound of the engine. I'm also ordering Haynes YZ manual as I think it will be a good buy for me.
      Anyway, the VIN strarts with CE08CE I think... on the back of my cylinder there where some mechanic had written with a marker pen -01 125. It seems like there have been a major failure before, as the head has small dents in it, and the cases are clearly not the same as the one with the VIN is much much smoother in the inlet and crank case. 
      Engine VIN is E111E I think, or something very similar to that.
      It has a white Airbox and floating front brake, I've read on other threads here that that was a new thing for -01, is it?
      Fast help would be much appreciated so that I can order parts as soon as possible.
      BTW, here a rebuild with wiseco crank, all seals, new main bearings, new ring and all new  gaskets cost about 500$. Just the crank at Yamaha was 1,200$ at the local Yamaha centre so you all should count yourself as very lucky!
      Thanks for help! I'll post other threads soon as I'm at the beginning is going to post the cases for a smoother flow and have complete HGS system. I really would love to have a 144 but I guess that will cost me insane money as everything is more expensive here, and I also guess sending head n cylinder to the U.S. would cost way to much too... So I'll, be doing what I can on my own and that's the cases for better flow and matchporting it to the cylinder. 
      I much appreciate any help! Thanks!
    • By faizakhtar125
      I've heard if you put VForce Reeds, properly jet your carb and clean the carb, change the exhaust pipe, clean the airbox and put a new air filter, and properly fix the shocks to match your weight, you can gain a ton of power?
    • By Allooushh
      Please help! I recently bought a Yz250f and have not been able to start it, it Has spark, but there are many issues with the carby which I wanna rule out before I leap into a rebuild, ( I want to avoid a rebuild if possible as I’m low on cash). The carby at the moment is a complete mess so the usual steps to fixing it might not work. So here’s the deal with the carb: 
      - It’s leaking fuel from overflow ( really fast! ) and when I mean really fast, I mean it emptied my fuel tank in 2 mins.
      - It has a slow leak coming from somewhere under the float bowl
      - the air fuel screw is not adjusted correctly 
      - I don’t know if the electrics work on it either 
      - I don’t even know if it’s shooting fuel into the cylinder or not, as after kicking it a couple times and it’s not starting I remove the spark plug and it’s still dry. ( I tried putting fuel directly into cylinder from the spark plug hole but the bike still wouldn’t start) 
      okay so I know it’s a lot but I’m not expecting anyone to answer every single question themselves. If each person could tackle whatever problem they know it would help heaps. Also just want to know what Order to fix things in as I can’t do air fuel until the bike is running and it won’t run unless I stop the leaking and get it to spray fuel into the cylinder. And buying a new carby is not an option ( I’ve got $40 to my name atm). Please help guys thanks.