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[dsn_klr650] muffler cutaway and performance
Posted: Fri Apr 21, 2000 10:53 pm
by cloudhid@aol.com
>anyone have the link to the stock exhaust cutaway?
Courtesy of Skip.
http://members.aol.com/cloudhid/exhaust.gif
Redondo Ron
[dsn_klr650] muffler cutaway and performance
Posted: Fri Apr 21, 2000 11:39 pm
by wileyE_@excite.com
Thanks Skip and Ron, The cutaway just verified my thoughts about
drilling out the endplate. Mine will stay intact.
For anyone interested I did some revealing testing last summer that
proved to me that the airbox and pipe are not really as 'corked up'
as one might assume. I got a cobra isde with the bike and thought I'd
give it a try. It had been drilled out and was pretty loud. Not
wanting to lean out I started my CV carb mainjet selection process.
Off came the front fender and handgards and out to the top speed
proving road. In trying to find the main size that gave the best top
speed (this method works for me) I found the bike had lost some. I
tried a bunch of jets with the airbox in different configs (cover
off, snorkel off etc) and couldn't mach the stock "corked up" speed.
Called a bud and borrow his supertrapp, was up to 12 discs and same
story. The stock pipe, dyno jet w/140, box intact always gave the
same or better results on the top end. Not saying the other pipes or
box mods are junk or don't improve sound or throttle response but if
the stock box/pipe was corked up I would thing it would have shown at
top speed. I am building a "can" made with calculated quarter wave
baffles based on the airbox volume, can't wait to hear it and test it
against the stocker.
[dsn_klr650] muffler cutaway and performance
Posted: Fri Apr 21, 2000 11:47 pm
by Kurt Simpson
> story. The stock pipe, dyno jet w/140, box intact always gave the
> same or better results on the top end. Not saying the other pipes or
> box mods are junk or don't improve sound or throttle response but if
> the stock box/pipe was corked up I would thing it would have shown at
> top speed.
My SOP dyno told me similar things but I've always thought the mods improved
the low and mid-range response...albeit at the sacrifice of top end...
Kurt
[dsn_klr650] muffler cutaway and performance
Posted: Sat Apr 22, 2000 3:25 am
by Jim Hyman
--- In
DSN_klr650@egroups.com, "Kurt Simpson" wrote:
[snip]
>> story. The stock pipe, dyno jet w/140, box intact always gave the
>> same or better results on the top end. Not saying the other pipes
>>or box mods are junk or don't improve sound or throttle response
>> but the stock box/pipe was corked up I would thing it would have
>> shown at top speed.
>>
> My SOP dyno told me similar things but I've always thought the mods
> improved the low and mid-range response...albeit at the sacrifice
> of top end...
>
> Kurt
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Generally, if your valves are adjusted to the tighter side of the
speck, this will give you somewhat more top-end power, with a
slight loss of low & mid-range power. Also, valves that are set at
the looser end of the specs tend to give better/crisper throttle
response in the low & mid-range.
Gee, I wonder if this is gonna open a major debate . . .
Professor
'95 KLR650-A9
Federal Way, WA. [USA]
[dsn_klr650] muffler cutaway and performance
Posted: Sat Apr 22, 2000 7:53 am
by Denzfeat@aol.com
Kurt writes:
<< the mods improved the low and mid-range response...albeit at the sacrifice
of top end... >>
That's almost always the case with aftermarket exhaust/jetting mods on street
bikes. Thing is, most of us run the engines at lower revs on the street; at
those speeds the modified engines (assuming proper jetting, etc.) are more
responsive and therefore faster. But if you want to run the 1/4 mile or top
end or the dyno, stick with the stock exhaust.
Pete the exhausted Streak
[dsn_klr650] muffler cutaway and performance
Posted: Sat Apr 22, 2000 8:53 am
by TLrydr@aol.com
I had a cheap cobra pipe, On my last trip to Big Bend the right side
plastic side pannel melted, I have the Kaw, saddle bags,
I had a welder friend of mine Gut the stock pipe, and welded a end cone that
points down ward, I then repainted black, Looks all stock , I picked up about
3 to 4 H/P over the cobra pipe, It has a real DEEP tone. and not to loud.
And Kaw is going to replace the side pannels free, Cool.
Cheap
Mike
In a message dated 4/21/00 10:43:45 PM EST, wileyE_@... writes:
<< anyone have the link to the stock exhaust cutaway? >>
[dsn_klr650] muffler cutaway and performance
Posted: Sat Apr 22, 2000 8:12 pm
by Jim Hyman
Wiley,
Theory is fine, but what matters is when the rubber meets the
road/dirt. My experience with tuning up hundreds of cycles showed
that a good running machine will be pull stronger in the lower/mid
range with the valves set MINIMALLY looser than the stock valve
spec. By this I mean if the valve clearance should be .004", I
would set the clearance so that a .005" feeler gauge would ALMOST
fit. Most customers don't give feedback to a mechanic (unless there
is a problem), however some customers reported comments like
"my bike runs better than ...". There are several books available
that deal with 4-stroke performance tuning that deal with the cam-
timing modifications that you mentioned. I've never had the chance
to try it myself. It would be interesting to hear from others that
have tinkered with camshaft timing. Any takers?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Subject: Re: [DSN_klr650] muffler cutaway and performance
Date: Sat, 22 Apr 2000 15:24:22 -0000
From: wileyE_@...
No debate here professor, in theory anyway. Loose valves equal
shorter duration, tight ones longer. I think saw somewhere that the
klr cams were ground at 256? I've always wondered about changing the
lobe centers by advancing/retarding one of the cams, did it on my ole
1100 zook and it is the big difference between a wr and yz 400
yammie. Anyone daring enough to try it on their klr?
wileyE
A6
Olympic Peninsula
> Generally, if your valves are adjusted to the tighter side of the
> speck, this will give you somewhat more top-end power, with a
> slight loss of low & mid-range power. Also, valves that
are set at
> the looser end of the specs tend to give better/crisper throttle
> response in the low & mid-range.
>
> Gee, I wonder if this is gonna open a major debate . . .
>
> Professor
> '95 KLR650-A9
> Federal Way, WA. [USA]
[dsn_klr650] tire irons
Posted: Mon Apr 24, 2000 1:56 pm
by Chuck MacKarness
For the road I use little old
>irons that use to come in early Jap tool kits. about 6 inches long and
>use whatever for a cheater pipe.
Recently, I used the handles of the box-end wrenches found in the OEM tool kit, they worked fine.
---
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Rev. Chuck
:^)>+
A13
...Thousands of smiles and not yet broke in!
http://klr650.50megs.com
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