RZ500 Performance pipes

[maser01]

Hey guys,
looking at a good aftermarket exhaust system for my RZ.
Can anyone recommend a tried and tested brand and what tuning mods are required to get them working.
Also looking at replacing front fork springs to help with the new Wilbers shock just fitted, anyone help with brand of good springs that will do the job please?

Many thanks,

T

[Smoker]

Kenny at http://www.twostrokeaddicts.co.uk" onclick="window.open(this.href);return false; is a great person to talk to about dyno proven pipes.

[Questo vecchio rz]

This topic can be easy as chocolote milk or frustratingly convoluted, This is my opinion.
From what is available, "All " of them are going to increase the performance on a RZ not only from power, but additionally a massive weight loss.
If your bike is basiclly stock, in some cases rejetting might not be necessary nor recommended, but small changes would likley help optimize the bike.
Some consideration should be given to your riding "style" & what you want out of it, virtually all pipes commercially available that you can ( simply bolt up under to the stock bodywork) deliver very similar peak power numbers, but there are some that deliver fatter low & midrange power at lower peak rpm, Example: said pipes in above post, I'm not sure if they fit under stock bodywork with unmodified subframes. Your choice depends upon how you choose to ride and the feel you are after. I've ridden RZs with Toomey, Lomas and Jolly Motos they all work quite good and most who have them are perfectly happy with them. You also have a choice of material and cosmetics, from mild steel w aluminum silencers to stainless steel w carbon fiber or any combination of the two you desire. For most RZs, brands or materials dont matter one bit they all work just fine, especially on a stock or near stock RZ.
IMO ultimate performance will likley be similar with "all" avail pipes which( fit under the stock bodywork), but you may prefer a fatter midrange as like those listed in above post, it really does depend on your personal desired riding style. If you looking for maximum performance then the topic changes to modified subframes to allow optimum "custom" pipe diameters and carb jetting w better breathing filters, reeds etc..
I dont put alot if stock in dyno numbers, really not much at all as often road results tell a diffrent story. Please be aware thats my opinion, if you do there are plenty of examples out here & on the internet. I think youll be happy no matter what you choose. As far a current "new" commercially available pipes I think there is only Jim Lomas and Jolly Moto. JL, Lomas craftsmanship is far superior and easilly equalls or surpasses most custom pipes available. There are smaller custom pipe builders as well one being Kenny in the U.K.(mentioned in above post) Swarbrick & Brian Turfrey in the U.S., also Gary @ Spec 2. which you can find all about in this forum. As far as well known pipes that are used and not in production any longer are Arrow, Toomey, & some other U.K. builders as well. Again all are good choices each has its drawbacks & advantages as well.
As far as springs go, www. RaceTech and gold valve emulators w progressive springs are pretty nice.
Im sure many here can also recommend more choices and thoughts.

[maser01]

Yes............no doubt a very interesting topic with many varying opinions

I'll start doing some research on what pipes will suit my riding style

Thanks for the responses much appreciated

[giron]

you should not only focus on your riding style, but also where you will be riding. When I lived in southern California. It was mostly a congested parking lot. The weekends either the Angeles crest highway or early Sunday morning Griffith park. The pipes for southern California where all the congestion were at. The mass produced pipes without mentioning names were fine. Now I live in northern California where I'm five minutes from roads like Angeles crest highway. I can appreciate Brian Turfrey pipes.

[David de Botton]

As an apprentice bike mechanic, it was common just to burn out the muffler & scrape out the ehader as best you can.
Years later I owned my own workshop
An aircraft mechanic came in an saw all the RZ 500 pipes hanging up.
He walked over and picked one up & commented on how heavy the pipe was. I said it was full of carbon & un burnt oil
He took the set of 4 pipes to work and put them all in an acid bath. He returned the pipes a week later and all 4 were as clean as the day they were made.
To cut short
By cleaning the pipes it brought back the original pipe volume. In doing so the bike carbureted much better & the bike pulled well from low down to top end.
From that day on I never did an engine rebuild without acid bathing the pipes
The factory go to a lot of trouble to design.
It was common to just change the main jet from the stock #195 down to #165.
This worked very well.

As for the YPVS....its total crap
Try locking the power valve full open.
Then go for a ride and enjoy hitting 6,000 RPM and doing wheelings a lot easier than ever before

[David de Botton]

Has anyone tried the Original Yamaha TSI Spec exhaust pipes??

( specs sheet posted here on the forum )

With the other modifications included...a 30% increase on power through the range is AWESOME.
I am seriously considering getting a set made....Just wondering who has thgese pipes on their bike NOW ??

[begbie]

As for the YPVS....its total crap
Try locking the power valve full open.
Then go for a ride and enjoy hitting 6,000 RPM and doing wheelings a lot easier than ever before

Now try locking it fully down and tell us it it's still total crap. Sheesh some people.

[MK]

As for the YPVS....its total crap
Try locking the power valve full open.

Sorry, this statement is pure BS. That had to be said.
Everyone who has a Yamaha with a PV (be it the 350, a TZR or the RD500) immediately reckons when its not functioning.

[Questo vecchio rz]

As for the YPVS....its total crap
Try locking the power valve full open.
Then go for a ride and enjoy hitting 6,000 RPM and doing wheelings a lot easier than ever before

Yes that comment should be striken from the record, it has no validity and is simply a completley uneducated statement.

The YPVS allows the exact same topend performance fully open or locked open. A functioning YPVS system greatly improves low & midrange. & transition performance while allowing all the benefits of topend.

No debate will even be considered, Please, do some research & you will then understand

[phildu31]

Wheeling ability of a bike is a result of the variation of torque delivery among RPMs of its motor.
But not a sign of efficiency.
After all, it's a matter of taste.

[MK]

The YPVS allows the exact same topend performance fully open or locked open.

Worse than that.
Measure with locked open valves and then with the controller active. The latter one will have a slightly higher max. performance, though you'd expect exactly the same peak.
It's just in the 1-2 HP region and I have no theory why, but belive me, it's a true fact.
You can even see this effect in the EngMod simulation.

[David de Botton]

ok guys....I hear it load and clear