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4 to 1 system - 3/5/2006 1:31:34 AM

R1000

Posts: 1128
Joined: 1/30/2006
From: Sweden
Status: offline

What are your experiences from changing the stock system to a complete 4 to 1 system?

Will there be a good increase in power, assuming the bike is properly jetted, or is it hardly noticeable and most a show thing? May cans are already changed to lighter/louder ones and there is a KN-filter to carbs, but I will change the whole exhaust system if there will be a significant power increase.

Maybe any of you have also dynoed the bike with stock exhaust and with replaced exhaust system, I'm interested in diagrams if available.

I've also seen a cheap solution where the header connection to left muffler is plugged and a free flowing muffler is fitted to the right side. Is that worth doing or is it meaningless out of a performance perspective if one already have dual free flowing mufflers. My guess is that plugging one side would disturb the flow and could even reduce exhaust flow.

Lastly, on bikes with full 4 to 1 systems, what jet sizes do yoy have in carbs?

Post #: 1

RE: 4 to 1 system - 3/5/2006 3:17:45 AM

Kaasari

Posts: 46
Joined: 12/24/2005
From: Finland
Status: offline

I replaced my 1000F's stock system to Yoshimura 4-2-1 system last winter. I got it dynoed & rejetted (sorry don't remember the jet sizes, I'll check if they were written in the dyno sheet), and after tuning the carbs it gave 128hp from back wheel, so there's definitely a good power gain. In reference 2002 Super Blackbird with 152hp from engine gave 133hp from back wheel in that same dyno. I have the dyno sheet somewhere, I try to find it and post it here. Air filter is still stock, don't know if K&N would give any more power. Complete aftermarket exhaust system weights ALOT less than stock system, so power-to-weight -ratio increases by that way too.

Also, think it good or bad, new system is definitely louder. As you can see from the image I attached, muffler in my system is quite small, and when giving it more throttle, it really blasts a loud sound. However it's nowhere near annoying, I'd call it more a manly roar, hah. I like it when driving on a motorway, I can still hear the exhaust and thus know in what state the engine is. In other words, I can 'feel' the engine better. All in all, I give complete aftermarket systems two thumbs up.

Cheers from Finland and surrounded by snow, waiting to ride my bike again.

Attachment (1)

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Post #: 2

RE: 4 to 1 system - 3/5/2006 4:00:16 AM

R1000

Posts: 1128
Joined: 1/30/2006
From: Sweden
Status: offline

Thanks Kaasari for the information, great figures! I'm having a Yoshi on my GSX R1000 and is quite happy with that. So, I will now try to find one for the CBR to. Perhaps they are not to easy to find since the bike has not been produced for some time. In worst case I will adapt a full race system from another litre-bike.

Where did you get the Yoshis system?

A lot of snow here to but I'm not keen at all start riding...

< Message edited by R1000 -- 3/5/2006 4:12:36 AM >

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Post #: 3

RE: 4 to 1 system - 3/5/2006 5:51:56 AM

Kaasari

Posts: 46
Joined: 12/24/2005
From: Finland
Status: offline

I found that dyno sheet, thought it was lost forever. I have no scanner so I took a photo from it, hope it's ok. In comments line it says for jets "125", don't know at all what that means but probably it has something to do with jet sizes.

Other picture attached is from stock exhaust. I draw a circle to where I think is the biggest problem in stock system. For my common sense, that part restricts free flowing (and those horsepowers for that matter) quite much as it has T-like shape, not straight line, and if you want to modify the stock system you should override that part somehow.

I got my Yoshi system from ebay -like net-market here in Finland, sold by fellow CBR rider. As you said they are harder to find now so I recommend searching for second-hand markets. Laser still has it's Pro d'Or 4-2-1 system for 1000F for sale brand-new and I remember I saw that Yoshi system being sold in some German net-shop (Louis maybe?), but you'll save lots of money if you find that system second-hand. Best of luck finding it, I honestly think it greatly improves already a great bike. Don't forget to readjust the carbs after fitting that new exhaust system!

Ps. Just noticed that the exhaust picture looks like some weird 4-3-1-2 exhaust system, bad camera angle I think.

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Post #: 4

RE: 4 to 1 system - 3/5/2006 5:58:59 AM

R1000

Posts: 1128
Joined: 1/30/2006
From: Sweden
Status: offline

Thanks Kaasari. I saw that Two Bros in US still have full systems to this bike, they cost a lot although.

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Post #: 5

RE: 4 to 1 system - 3/5/2006 11:18:13 AM

old1000

Posts: 175
Joined: 2/25/2006
Status: offline

i have a full yoshi system on my 87 1000f and it is reall loud, like he said, "manly", but loud!

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Post #: 6

RE: 4 to 1 system - 3/5/2006 12:24:10 PM

slowpoke

Posts: 518
Joined: 8/6/2005
From: Denver, Colorado
Status: offline

I know you lose a lot of weight with aftermarket exhaust, but do you also lose the centerstand?

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Post #: 7

RE: 4 to 1 system - 3/5/2006 2:55:03 PM

R1000

Posts: 1128
Joined: 1/30/2006
From: Sweden
Status: offline

I'm happy to discard the heavy center-stand and will use the portable wheelstand.

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Post #: 8

RE: 4 to 1 system - 3/5/2006 5:05:48 PM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
Status: offline

I have an aftermarket Exchust and a centerstand

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Post #: 9

RE: 4 to 1 system - 3/5/2006 7:17:31 PM

old1000

Posts: 175
Joined: 2/25/2006
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i had to take mine off, but i was happy to

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Post #: 10

RE: 4 to 1 system - 3/6/2006 12:26:00 AM

CBR_1000F

Posts: 15
Joined: 2/28/2006
From: NS, CANADA
Status: offline

I've been debating this mod since I got my CBR and only found 2Bros that had a 4-2-1 system for my bike. Only the price has been the deterrant for me... so much money, but I can only imagine how good it would sound! Go for it if you can!

_____________________________

1994 Honda CBR1000F for sale - $4000 obo

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Post #: 11

RE: 4 to 1 system - 3/9/2006 11:44:41 AM

R1000

Posts: 1128
Joined: 1/30/2006
From: Sweden
Status: offline

There are certainly not many used or new full systems around to this bike. I've ordered a Laser Pro d'Or 4-2-1 system by a German company. It costed less than half the retail price in Sweden, but was still about 600 USD.

(in reply to Kaasari)

Post #: 12

RE: 4 to 1 system - 3/10/2006 2:57:47 AM

CBR1988

Posts: 198
Joined: 10/25/2005
From: Hants UK, NY USA, NC USA, UAE now
Status: offline

Hi:
Just to let you know I have had a couple of these bikes and I have had a Vance&Hines SSR2, a OMT full race, micron slipon with stock system
and a Yoshimura pipe on the 4 CBR 1000Fs I have owned (88,91,95,&99) and only liked the V&H and micron as good as the stock system, as I
ride my bike as my main transport att, about a 1,000 miles a week. The Yosh and the OMT pipes got rid of the centerstands and were pretty loud
and I feel the only real perf advantage I got was all the weight I got rid of. The microns are ok but the plug was a pain to get out, when I went to
put it back to stock for a long trip I was going on.
I really feel the V&H 4/1 SSR2 gave the best all around performance as well as a good sound but only really was slightly loud at full throttle.
I like my centerstand and the V&H works with or with out it and is still available from vance & hines new and would be my only choice for a 4/1
pipe. I like the slip on micron but the plug is hard to take in and out when I want to put the stock pipes back on and I kept the V&h pipe for later
use.

If you look on ebay you can find one(V&H SSR2) they go for about $100-250 USD used and then I would send it off to get a jet hot ceramic coating
($150.USD) and it would probally make you very happy for many years to come, and they are rebuildable with parts thru V&H or
www.Dennis kirk.com. A new OMT just sold on Ebay for $50.00 USD this week but had no baffle end.

I hope you enjoy the bike with the pipe you buy and get many years of fun riding on it, good luck.

BTW the jets ended up being 132s but thats with all the work thats been done. My stage1 was 124 mains (yosh pipe, K&N filter and jet kit) and
works well with stock pipes and K&N too.

< Message edited by CBR1988 -- 3/10/2006 3:23:17 AM >

_____________________________

When In Doubt Do Without

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Post #: 13

RE: 4 to 1 system - 3/10/2006 5:02:20 AM

simochell

Posts: 50
Joined: 2/3/2006
Status: offline

I have a REMUS 4-2-1 system fitted to my 1990 fl,
stainless headers,link pipe and an alloy race can.
I`ts loud when your giving it some beans,but not offensive,and gives good power and torque gains without rejetting.
They come in two options,54mm link pipe for race look and sound,or 76mm pre baffled link pipe which is the one i have.
And a multitude of can styles.
I`ts beutifully made too!But not cheap!
500+ UK pounds.
I`ll try to find a link with price,pics etc and post later.

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Post #: 14

RE: 4 to 1 system - 3/10/2006 5:04:18 AM

simochell

Posts: 50
Joined: 2/3/2006
Status: offline

Forgot to mention,it keeps the centrestand and drain plug access too.

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Post #: 15