HondaCB650

LUCKY LUCKY LUCKY MAN!!! It looks exactly like mine (except in a LOT better shape!!)!!

It's amazing what a little cleaning and paint can do to the look of a bike! Since you've got it all torn apart, could you take some detailed pictures of the cylinder head? Specifically the combustion chamber, intake and exhaust ports, and the valve bowls? I'm trying to see how much material is avail...

I get an average of 4.6L/100km or approx 50mpg with the drilled mufflers on my bike. Is that highway, city, or mixed driving? I made a 5 hour trip to my parents' house on I-70 a couple of weeks ago and it got 47mpg both ways going 70mph. Driving around town I usually manage 55 to 60mpg. I'm willing...

I'll try to get a recording, but all I have is my camera/video phone (I'll have to figure out how to keep the sound from over driving the microphone). It's not nearly as loud as open headers, but obviously louder than stock. It doesn't have any "buzz" to it at high revs, and has kind of a ...

Well, I got them out. They're basically "glass packs" that are about 6 inches long. I just had to do a heck of a lot of pulling to get them out. They're simply shoved into a hole that's about the same size (tight fit). The steel plate with the 3 rivets is all that was holding it all togeth...

The stock ports on the 650s are much better than the SOHC 750's. Much. The US '79 model had the 63hp and the Euro model had the 50hp cam, I believe. I guess "smaller" isn't really a good description. I mean low-RPM tuned. Low lift, short duration, little overlap. For instance, the peak tor...

I'll be looking forward to seeing how things work out for you. I hope the formulas were some help. Have you considered some type of forced induction? It seems to be popular with some of the newer bikes. Thanks. Hopefully I'll get this stuff done before gas prices jump up to $4 a gallon... I've neve...

I would think those low-rpm optimized engines are lower compression because at those low compression ratios you have absolutely no worry about detonation. The small camshafts increase the dynamic compression and therefore less of it will "bleed" into the intake (reversion). An engine like ...

I guess all I need is the compressed gasket thickness and the combustion chamber volume. ??

How do I pull this thing out (circled in red)? I've pulled, twisted, cranked, hammered, and pretty much every combination and it won't come out.

What are the exact engine specs on the '79 CB650? I need to know the bore, stroke, head gasket thickness, and combustion chamber cc's. Is there enough room to shave the head/cylinders for higher compression? I want ~10:1 but if that's not possible with a simple head/cylinder planing, how high do you...