cbr600 exhaust swap

[89cb1]

i know that the cb1's engine and the engine in the cbr600 are the same juts a diifferent size of pistons. So will the stock cbr600 full exhaust fit on the cb1? My plan is to swap them so that it will have more flow so that i can put a jet kit in it. Also does ne one know where to get a jet kit because the motorcycle shops around me don't have it. Thanks

[clarkdw]

Can't answer about the CB600 exhaust but there are almost always jet kits listed on ebay. Here is one such listing. There are other cheaper ones as well.

http://cgi.ebay.ca/DYNOJET-JETKIT-HON-CB-1-1128_W0QQitemZ130199948157QQihZ003QQcategoryZ35597QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Doing a whole lot of work to the CB-1 to gain hp could turn out to be a pretty fruitless exercise. You could spend a lot of time and money and the slowest 600 sportbike will still kick your butt in a straight line. Putting your time and money into the suspension to tweak the handling will give you a bike that will leave most litre bikes and 600s in the dust when you ride the twisties or on a tight road course at a track day.

[89cb1]

Thanks but what stage should i put it at? I want it as fast as possible that is still reliable. And is it hard to do myself? Also i have to make more flow through my exhaust how would i go about doing that? Thanks again

[REgina CB-1]

hey 89. Welcome to the forum. I haven't been here that long and I plan to be here allot so I really don't want to offend anyone, especially the guys who have been riding cb-1 long b4 me. Actually i haven't even ridden one yet, mine is still in transit.

Anyway, I see that everytime you post about making your bike faster someone is advising against it. DON"T LISTEN. you're on the right track. I have a plan for upgrades too. I know what you're thinking. You aren't planning on spanking a hayabusa, but you want to go faster. Me too.

O.K. exhaust. Yes. you may notice a small improvement. If you can, think about doing your intake, exhaust, and getting your jetting done professionally all at the same time. I keep hearing about Dyno-jetting but I don't know anything about it. Maybe some of the other guys can help us out with that one.

check this site out for some ideas - www.hondacb1.com

You can also consider swapping the cams with the 400RR (i think). You might want to consider a port and polish, performance carbs, bore kit, turbo. Whatever. Also adding or subtracting teeth to your sprockets can change things allot.

See we need guys like you to do stuff and report back how it works. We should keep the CB-1 culture evolving. We all know the bike has legendary handling characteristics, but some of us need to know how far it can go.

I plan to ride more or less stock this year then make some modifications in the off season. I'll keep you posted, please do the same.

[clarkdw]

Please don't misunderstand my intention in addressing the issue of modifying the CB-1. I think it is great that people have enthusiasm for doing that. Just that it is such a rare and unusual bike that the parts sources for aftermarket stuff have all but completely dried up. If you find parts they will either be prohibitively expensive to bring from Japan where a few can be found or will be simply unavailable. There were few enough go fast parts for the bike even in its prime years and now almost twenty years down the road you have to be very lucky to find any usable stuff.

The folks who do head work will be happy to do the head for you but it will also be extremely expensive to do and because of the rarity of the bike it will likely be the first and last of its kind that the guy will see. Hard to get a really great porting job without the benefit of development work using many heads on the flow bench. Pistons and internal engine parts other than stock stuff will all be custom built.

Once you ride the bike you will appreciate that the power is mostly available above 10,000rpm and to try and install 400rr cams (if you can find a set) will pretty much make the bike useless on the street as they make the little screamer even more peaky. If you choose to use forced induction to up the hp, you will need to get custom low compression pistons and custom ground cams to make it worthwhile. It would be a shame to find out that the bottom end of the engine is not up to the task then and I know of no one who can answer if it is.

So, I am not advising against modifying your bikes at all. I am just suggesting to you that if you do plan on it, you better have very deep pockets and no matter what you spend on increasing hp, a $2500 Honda 600 is gonna kick your butt.

I sincerely do hope you enjoy riding your bike stock or upgraded as much as I have mine.


edit: Dyno-Jet is just the manufacturer of a jetting kit that is available for the CB-1. One of the few new parts regularly available on ebay for the bike.

[89cb1]

i have absolutly no itention of boring out or turboing my cb1. i know it isn't faster than any 600 but i did have some realistic goals. I know it's already faster than the ex500 and ex250 and bikes of that size but i also want to be able to beat the little riced up civics my buddies drive. I don't want my cb1 to hit 300 km/h but i would like it to hit 200 if possible and maybe get my wheel off the ground. I know it can be done I'm a small guy about 135 pounds and with a jet kit and an exhaust I can't see why my goals can't be achieved. The cb1 is really fun in the twisties and I do love driving it i just want a little more pep. So i think you had the wrong intention of what i meant by making it faster. Anyways thatnks for all the help and i do have one last question does anyone know about a kerker exhaust system the fits on the cb1. I read about it all the time on the internet so i was just wondering about it. Thanks again

[clarkdw]

Getting the front wheel off the ground is a very achieveable goal with this bike. It will beat most of the 500's all day long. The combination of 200km/h AND getting the front wheel off the ground may be a very big requirement. My bike is a very healthy stock bike. On stock 15-41 rear gearing it will bounce off the rev limiter in 6th gear. That is close to 200km/h on the clock but using GPS it is exactly 180km/h. Changing the gearing to 15-37 to reduce highway rpm allows me to hit 180km/h at redline 13,500rpm instead of reaching the rev limiter about 1000rpm higher, still measured on GPS. On a long downhill run with a good tailwind you MIGHT reach 200km/h. With some bodywork added to clean up the aerodynamics it might be more do-able. Upping the gearing to get the high top end and better highway cruising rpm KILLS the bottom end of the bike. Because it is so peaky in the hp, doing the change slowed my 1/4 mile times from 13.8 to 14.25sec. All of it lost in the first 60ft time. Wheelies are just about impossible now.

I think that this year I will be going back to at least stock gearing or possibly 15-42 as the bike will be used for track days and not as much highway riding. The top end speed is not nearly as important to me as the fun factor. 13.80 sec quarters should put away most of the riced up civics. I had a b-16 v-tech powered CRX and it would run 14.0 quarter. At 135lb you should have no trouble pulling the front wheel with stock gearing.

The kerker system may still be available for about $600 U.S. I will dig around and see if I can find the old links to where it was found. try searching the old posts here and  http://hondacb1.proboards7.com/ there might be some help there.

[ptlcb1]

89cb1,
     Clarkdw is right.  It can get very expensive trying to get more power out of the CB-1 engine.  I know this first hand.  When the bike was sold in the States, for only 2 yrs, '89 and '90, even then there wasnt much in terms of performance upgrades.  Now almost 20 yrs. later, its near impossible to find the upgrades that were once available.  The ideal situation, is to have a connection in Japan.  There, the CB-1 was sold from '89 to '93, I believe. There will be more parts over there.  If you choose to do so this way, be patient, because its going to take some time and money...

Based on what you stated as being your goals, is where I will start.  You stated, "getting your wheel off the ground".  This is a simple one.  The US market CB-1, doesnt have much power down low.  Like Clarkdw said, above 10 grand is where its true power is.  To be able to increase your chances of getting the front wheel off the ground at low speed, do what some stunters do.  Increase the size of the rear sprocket.  This will give you faster acceleration, but a lower top speed.  You can only go so large on the rear spocket, because eventually, you are going to need a longer chain.  This will give you more grunt down low, so when you crack open the throttle and pull on the bars, the front should come up easier.  As stated earlier, you will also have quicker acceleration for your buddies in the "riced up civics"...

With regards to the engine of the CB-1.  I do believe it was made from the same castings as the CBR600 Hurricane engine which came out in the late '80s.  I doubt that an exhaust from a CBR600 today will fit the CB-1. So you will need to do some research regarding this.  If you can get your hands on a Kerker exhaust, it will allow the engine to exhale better and will be much lighter than the stock exhaust system.  

The lighter you can make the CB-1, the better your power to weight ratio will be, which will improve the performance of the bike.  Keep this in mind always!  

The Dyno Jet Stage 1 kit is probably the only jet kit you are going to find.  With whatever type of exhaust system you find or maybe have made for it, you should re-jet the carbs.  As stated in a previous post, once you find an exhaust and jet kit, you should then find a performance shop in your area, that does work on bikes, that has a dyno.  A dyno will be able to tell you what your optimal air/fuel ratio should be.  This ratio, is very important in getting the most out of the mods.

On the intake side, a easy and cheap way to increase the CB-1s power, is to take the snorkels off of the air box.  The stock air box is very restrictive.  The way it is designed, it sucks hot air from the engine back into the carbs.  Not good.  Removing the snorkels allows the engine to breath in fresher, cooler air, thus increasing power.  If you are going to do this, you might as well remove the paper air filter and make a foam filter to take its place.  No company that I know of produced a foam filter for the CB-1.  Its a pain in the butt to cut out the paper filter, but worth doing in search for more power... This should also be done prior to going to a dyno.  With these mods, you will notice an increase in power, but the key is riding it in the powerband, from 10 grand to redline!!!  Even completely stock, if you ride it hard, with the revs above 10 grand, you will think you are on a different bike...

After the things mentioned above, it gets a great deal more expensive, in search for more power.  IF you can find the cams off a CB400RR , Jap model, they will help. But its going to cost you.  Racing carbs will help, but its going to cost you.  A big bore kit will help, but will cost you.  For the right price, almost anything is possible.  But the CB-1s ace is its handling.  Up grading the suspension will allow you to use all of the power you do have...

http://www.hondacb1.com/coolrides/09/09cool.htm  Click on the small pics to enlarge them.  This is my CB-1.  



 

[ptlcb1]

Great minds think alike. 

[89cb1]

Thanks for all the help. I've been thinkin about what you guys were saying and I think i'm going to go for low end power. I drive a lot more in the city and love how fun the bike is at low speeds. So thanks for the help.

[ptlcb1]

What do you plan on doing, to increase your low end power?

[REgina CB-1]

Sprockets?

[stussels]

i know that the cb1's engine and the engine in the cbr600 are the same juts a diifferent size of pistons.

this is not at all true.  the cb-1 uses the same clutch as a cbr600 but thats about it.  the cbr600 has chain driven cams and the cb-1 uses a gear train.  this is the biggest and most obvious difference between the two engines.  the exhaust ports of the cb1 are going to be narrower than the 600.  i dont even think the cb400sf header will line up on a cb-1 but i could be wrong there.

i think an economic way to spruce up the exhaust if its not too rusty, would be to sandblast and ceramic coat the original header and buy a slip on canister and fit.

[Rooter]

As much as I would like to install a slip-on, I just can't muster up the courage to mutilate a pretty much prestine original pipe. Does anyone know of a Kerker for sale?

[OCB-1]

I'm tempted to pull my entire exhaust system and have it ceramic coated either satin black to match OEM or chrome silver.

I would love to but a yoshimura can on it, but I don't know how to do this or which one to put as it seems they don't sell anything made for a CB-1 specifically.