Rufion

I have seen a website which says removing them in combo with "their package" of jetting filter and dyno time you get xyz increases.

Anybody played around?

kai ju

When the VTR came out in 98 it had a tendency to die if you pulled the clutch and chopped the throttle, like when coming to a stop after a good run.
What happens is that the port velocity drops so much that it can no longer pull enough fuel from the carb to keep the engine running.
I used to be able to kill the 98 at will with the right combo of throttle/clutch.
In response Honda introduced the "restricted " manifolds that maintain port velocity and pretty much prevent the stalling.
I've ridden pre and after bikes and can't really tell a difference, other than that it no longer stalls.
Kai ju

jschmidt

What site is that?

oicdn

http://www.dynobike.com/vtr1000_tips.htm

Is the only site I could find...and damn they got some high numbers for just jetting and filtering....on a stock exhaust...BS flag???

jschmidt

Aha! I was wondering if they were the source of this BS rumor. I believe what is pictured there (and I've seen that pic elsewhere) is the French model VTR that is horsepower limited. I've never seen that on a US spec bike.

However the place is in Australia, so I suppose they may have the horsepower restricted version too.

They are also wrong about the K&N Filter. On an unmodified VTR engine, you can expect to gain nothing or lose about a horsepower. It's also worth noting that they seem to give basically the same advice for every other bike.

So yes, I absolutely call BS. But I'm willing to give them some benefit of the doubt since they live upside down. :wink:

oicdn

So a filter on a slip-on'd only motor is worthless?

jschmidt

Well, it'll be cleanable. But the stock filter flows more than adequately for the stock motor. A slip on really doesn't make any difference.

Years ago, a K&N was a must-have performance mod for most any bike. Not so much anymore.