Topic: need advice for front suspension overhaul on 1976 CB750 K

[pbelanger]

Greetings everyone,

My 1976 CB750 K is due for a front suspension overhaul. Oil doesn't seem to leak (in fact, I think it doesn't), but I find the suspension to be very soft when I push on it sitting on the bike. (bike at rest, leaning on the suspension, and pushing on it) Plus, when I'm riding, it feels "bumpy" a lot. I mean, every little bump I it, I feel like to only suspension I have is the front tire. It gets a little scary on high speed corners, as you can imagine.

If I was to order parts through eBay, what would you recommend?

I presume, since the tubes are good:

1) seals, as they are probably not that expensive?
2) springs?

Any other thoughts?

Thanks in advance for your help and considerable knowledge, as always.

Nest regards,

Paul

1976 CB750 K

[Gordon]

Have you checked the level of the fork oil?

[pbelanger]

I must admit I didn't. But then again, that could explain why it's a bit bumpy. But the extreme softness while in "compression" mode? Wouldn't that be "spring" related?

[pbelanger]

Hi all,

Today, I finally found some time to look into this. First, I purged the old oil inside both fron tubes. Then added some fresh 10W30 and purged them again real good. Now, I added just what it says in the Clymer manual: 7.0 - 7.3 oz in each fork.

I went for a test ride. The thing was HARD as hell, worst than before. It really felt like the only suspension I had was the fron tire! I got back home and squirted 2 good shots off each tube and went again for a test ride. It's still really stiff. At rest, I could feel it wasn't quite right. I then squirted 2 more good shots off each tube. Now, it begins to feel smooth again, but it just isn't optimal.

Question: how much oil do you guys add when you fill each tube?

Thanks in advance for your help,

Paul