My big boys toy

[theplumber]

really good job on cleanin up the tail. that for sure is on my to-do list, but for now i gots finish my riser and bar set up cuz like you said the season flies by fast. once again NICE!!! 

[gymix]

Oldsmoker,

I'm new to CB-1s. Just picked up a basket case. Your exhaust looked cored out in the pic. Is it?

Thanks

[oldsmoker]

Yes its got the baffle taken out. I used a hole saw just a bit smaller than the outer lip and then a long chisel to work on the inner weld. Yeah, I make it sound easy, but there was some twisting and banging and more than a few curses involved. Once out and the edges were filed it looked good and has a really nice sound.

[REgina CB-1]

Any re-jetting concerns?

[oldsmoker]

I went to a Dynojet stage 1 kit at the same time. This kit works well with a stock air filter and a stock or modified exhaust.

[REgina CB-1]

Any trouble? Flat spots? I want to do that too but my bike is running so well right now... Just want to b sure things will get noticeably better, without losing anything.

[oldsmoker]

No problems. I did notice a slight boost in power, not great but OK. What is really apparent is the very cool sound!! Almost like a MotoGP bike but not as loud.

[Daveontheedge]

Do you have any issues with backfiring or would there be from losing some back pressure when you remove the baffles?

[oldsmoker]

Very light popping, almost a gurgle on decel. No loud pows. I hope that descibes it OK.

[Daveontheedge]

Worth the effort?

[oldsmoker]

Oh Yes!
 The least expensive upgrade you can make.

 REgina and Daveontheedge,
 I had some hesitation also, no backup exhaust or a line on a replacement at the time, but I wanted a freer flowing exhaust to go with the jet kit. I have since passed on two Kerker exhausts that were priced right to stay with my modified stock pipe. Thats not to say I wont go to a lighter, more stylish exhaust in the future. I'm just satisfied with what I have right now.

[Daveontheedge]

Right on. Would it work with stock jets or do you recommend re-jetting at the same time? And what length of chisel is needed? Any tips if you were to do it again?

[oldsmoker]

The stock -1 is set up on the lean side, so a jet kit is a must. The only thing I would add to the kit is a #38 slow jet.
 The larger slow jet will help cold starts and adds a little more fuel throughout the rpm range. Don't adjust the pilot screws unless you find you have idle/low rpm issues, but you should remove the pilot screw stops while you have the carbs off the bike.

 As for the chisel, anything over 12" ( 264mm ).
 Tips: use a holesaw just a bit larger than the exhaust outlet pipe before you cut with the larger holesaw. That way you can remove that flap of metal and have more wiggle room and a better view inside the can.
         leave the exhaust on the bike. Its a stable hands free location to work from.
         elevate the bike if posible. the bed of a standard pickup truck is perfect, it puts the exhaust close to eye level and you can tie down the bike.
         use a very bright light. the inside of the can is covered with soot and very dark.   
         

[Rage]

Ft and RR tires are Conti  Road Attack, 150/70 17 rr and 120/70 17 ft

I have the same tires (almost) but I ran with 120/60-17 and 160/60-17. How were they by the way?

[oldsmoker]

I like them alot. They stick better and I feel more confident in turns.
 I commute alot on the highway so I tend to get flat centers. On the stock tires I could get one season before I started to worry about changing the rear, but it looks like I may get two seasons out of the Road Attacks.