Topic: Riding a CB650

[Ibsen]

VIDEO CLIP

[Pinhead]

That's quite a bit louder than my 650. I really need to get rid of these quiet stock mufflers. How fast were you going? And where? That two-lane looked more like a one-way single lane road where I come from.

[Vatch]

That sounds so much better than my 650!  Hmmm, maybe the baffles need to removed or have some holes drilled in them or something.  I need to do top end work this fall anyway (left boot is getting more oil spots with every ride), so I might as well redo the carbs again after I open up the exhausts a little 

[Ibsen]

That's quite a bit louder than my 650. I really need to get rid of these quiet stock mufflers. How fast were you going? And where? That two-lane looked more like a one-way single lane road where I come from.

I didn't go as fast as it looks like on the video. 

That is a local road a couple of miles outside the town I live in here in Norway. That is what many of the country roads over here looks like, twisty and narrow. But again, the camera makes it look more narrow than it really is.
The stock mufflers are drilled. This was done by the PO. 
This is how the they are drilled. I'm afraid the picure isn't the best, but it should give you an idea.

[Pinhead]

I inverted the colors with Paint so you can see the holes a little better. Looks like I've got something I can do without replacing the whole exhaust! Do you think doing this will yield any other benefits besides the added sound? Is that enough to offer enough less restriction to see any gains?

[dusterdude]

you might,but i gottta say,i love your avatar

[Ibsen]

I inverted the colors with Paint so you can see the holes a little better. Looks like I've got something I can do without replacing the whole exhaust! Do you think doing this will yield any other benefits besides the added sound? Is that enough to offer enough less restriction to see any gains?

Thanks for improving the pic.

If the mufflers had been without the drilled holes when I got the bike, I don't think I would have drilled them. But since they were I didn't have any option. I really don't know how the bike ran before the holes were drilled, so I can't tell if it made any difference though. There are no running problems, so it seems to work. However, the stock 92 main jets had been replaced with 98 mains.
What I do know is that sometimes when you open a stock system that way, performance sometimes goes down, and fuel consumption goes up.
The consume on this bike is an average of 50~51 mpg. The best I have seen on a long ride with cruising speed around 55mph is 56mpg,  ridden a bit harder, 44mpg. So it doesn't seem that the drilling of these mufflers have had much influence on the fuel comsumption.

This is how it sounds running on the main stand:

http://home.online.no/~ivbekkel/CB650/CB650.WAV

[Pinhead]

I think the 650 got 40 or 45 mpg from the factory, so the jets/exhaust seems to have actually improved efficiency. It's recommended to go to 98 mains anyway, so it looks like when I get my jets I'll try the exhaust mod. Thanks for the pics!!

Dusterdude- Thanks. Someone else on thte forum has a similar avatar, but I believe he's using the half-on-fire face of Nicolas Cage. Do a search for Nightrider. It's a new movie (a remake rather) that will be coming out in a while. Looks really good, even though he's driving a POS HD chopper.