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Message started by klx650sm2002 on 12/16/04 at 05:45:42

Title: Exhaust performance
Post by klx650sm2002 on 12/16/04 at 05:45:42

Those of you who have fitted after-market pipes and rejetted carbs, could you tell me the header length(including the bit in the silencer), and what the improvements were at what revs/roadspeed ?

thanks a lot

Clive W :D

Title: Re: Exhaust performance
Post by Greg_650 on 12/17/04 at 04:45:33

Mine is pretty much all header, and the improvement seems to be at higher revs and speed. When I have the time, I plan to install a different baffle to improve the low end grunt a bit more.

Title: Re: Exhaust performance
Post by Max_Morley on 12/17/04 at 12:44:16

I'm using a RAASK with about 1 foot cut off and the baffle in the HD-FXD muffler would be about the end of the original RAASK. When I tried a HH Drag Pipe for a couple days, I lost about 8 mph on where I could run in 5th gear. 43 up from 35. High end was probably better. With the set up I have I'm back to 35-37 in 5th as minimum where it will pull cleanly to cruising. I'm hoping this company will develop a suitable high torque/ high HP muffler, http://www.performance-design.net/index2.htm. They have designed one that provides both torque and HP results. Years ago I had a book with a formula in it for max torque length of intake and exhaust tract or conversely max HP at RPM. In the early 70's I had a Honda SL-125 I modified and used for observed trials and commuting. I had lightened it to 200 lbs, had high back pegs, CT90 seat cut down, Preston Petty fenders (rear with light), removable headlight, and a Powroll stroker kit with a hand made exhaust from bits and pieces with a round flat muffler, forerunner to Supertrap I think, exdusher?? Had amazing torque for 150cc about 1600 - 2500 RPM. Did well in amatuer trials of the time with it. I have looked in vain for the book and/or formula since. It must have been loaned and not returned or lost in moves over the years. :)

Title: Re: Exhaust performance
Post by Ed L. on 12/17/04 at 16:30:57

Rejetted to a 152.5 main, 1/2 thickness white spacer and installed a Sportster muffler with a 8" adapter between the stock pipe and muffler. Added about 600-800 more rpm with noticable power increase above 4800rpm. Seems to have a little less torque between 2200rpm to 3200rpm. Torque comes on above 3800rpm. Haven't had a chance to see what the top speed is yet. Hope that this helps. Ride Safe

Title: Re: Exhaust performance
Post by klx650sm2002 on 12/18/04 at 01:07:57

Thanks very much for your info guys.

Clive W :D

Title: Re: Exhaust performance
Post by klx650sm2002 on 12/18/04 at 01:15:15

Hey Greg,
If you are looking for more low down grunt you could do worse than making your pipe longer, 135mm would move things down by 500rpm's (270mm=1000rpm's etc).

Clive W :D

Title: Re: Exhaust performance
Post by Greg_650 on 12/19/04 at 05:14:48

Maybe some kind of fishtail tip on the end of the Raask?

:P

Title: Re: Exhaust performance
Post by klx650sm2002 on 12/19/04 at 05:32:01

I have no experience of fishtail things.

Clive W :D

Title: Re: Exhaust performance
Post by klx650sm2002 on 12/21/04 at 08:31:02

I was going to machine an exhaust insert to help silence KLX (carb area - needle area = silencer outlet area) but not reduce power.
Anyway it was below zero in the garage so I didn't.

Clive W :D

Title: Re: Exhaust performance
Post by Lancer on 12/27/04 at 09:56:02

GANG,

I have a muffler from the company referenced above, Performance Design, and it is well worth the $. I happened to contact the owner just when he was removing one of their R&D units from a test bike and was able to buy it for $50, the regular price being about $400 for a pair of them.......these are Harley mufflers for the big road bikes. It works great, creates backpressure when in the low-mid range and acts like an open pipe when wide open throttle. I have tried several different muflers and this one is the best...hands down.

Title: Re: Exhaust performance
Post by klx650sm2002 on 12/29/04 at 06:19:35

Exhaust insert is done and fitted, haven't been out yet but it is quieter and should be big enough not to loose power.
The std. outlet is 20mm the one I've made is 40.4mm, just over 4 times the area.

Clive W :D