I'm just curious if anyone has tried a balance tube on the exhaust pipes (like a H-pipe on a car) to equalize the pressure. Also, does modifying the stock muffler add much power? I know the DS guys have it good with an endcap mod for extra HP. Does anyone make a slip-on for the V? Thanks...

 

I was thinking the exact same thing the other day. I've seen street bikes like that. Wonder when we'll see the V?

 

Muzzy has an equal length pipe if that's what you mean.

Too answer you question about what Yama dust taste like.

It tastes just like Kawa dust, but it a lot harder to find.[img]i/expressions/face-icon-small-cool.gif[/img]

 

I have talked to race car engine builders that tell me that the talk always used to be ..equal length headers. Nowadays they use formulas that work just as well without equal length. Apearently(and I forget exact formulas they mention) ,that for instance ,the other pipe can be 1/4 as long,or 3/4 as long,...but not 1/2 as long. ...things like that.
I have a set of HMF duals here for the v. HMF's have 1 1/4 primary pipes that step up to 1 1/2 for the rest of the length. I just cut them apart and made 1 3/8 primary sections on these pipes to test on the dyno and see how it changes peak rpm/hp ,etc. With the FST kit and cams/porting, I'm quite sure bigger head pipes will help. I'll have it on a Real dyno(crankshaft) next week to experiment.
I do have a set of MBRP duals for sale if anyone is interested.MBRP's stainless duals work great and are not too loud,but are 1 1/4 pipes like the others. I want to experiment with pipes of larger size for the mods.(I bought this bike to test with for a couple months,...that was a year ago,lol.)

 

Heck, man, we have a 1 1/2 inch dies for our mandrel bender, at work! Do you think that 1 1/2 is too big for a 650? I plan on using larger cams, and the CDI is on it's way.

 

In my opinion an H pipe would work great, it always quiets things down a bit also. Also an A.R. and step type header would also work great, especially with high overlap cams.

 

I believe that the Yoshi Duals have a crossover tube. HMF offers a slip-on.

 

I'm not sure the H-pipe does all that much. Case in point: Yoshimura duals come with an H-pipe, and I had a set of Yoshimura duals on my V-Force until just a month ago. Yoshimura recommends keeping stock jetting with their pipe, at sea level. I have an airbox mod on my V-Force, so I found that perfect jetting for my V-Force with the Yoshimura pipe was actually one jet size bigger than stock (138/142), where I ride at 6000 ft above sea level.

I was not to impressed with performance and decided changes were in order, so I sold the Yoshimura exhaust and went to a Muzzy two into one single exhaust. I also installed a Dalton clutch kit and a FST CDI. With the new set up I found that I needed to go another 1 1/4 turns out with the pilot air screws, had to change to Dynojet needles that are set on their richest setting, and had to go up three sizes on the main jet of each carb, in order to get back to perfect jetting. And this is still at 6000 ft altitude, with the same airbox mod.

Needless to say my V-Force is running a whole bunch stronger than it was before. And as an example of how much better it is running, when I drag raced my son on his stock YFZ before he would beat me by one quad length in a 300 ft drag race. Now I beat him by 3 to 4 quad lengths in the same 300 ft drag race. The Dalton clutch may have helped improve drag times, but it most certainly did not affect jetting, and I would tend to think that being able to go up three jet sizes in each carb has made a big improvement in performance.

So if the H-pipe helps so much, why did the Yoshimura pipe not move as much air through the engine as the Muzzy pipe? Something to think about ...

OL

 

Could be many things. Pipe diameter? Overall length? Tunned pipe? Stepped pipe? Or something else?
The only real way to tell would be to H the Muzzy pipe and pop it on a dyno.

 

would an "H" in the Muzzy pipe have any benfits if it's a 2-into-1?