Author Topic: Suspension upgrade recommendations? CB750 (Read 11009 times)

Tripps · « **on:** June 23, 2013, 07:53:54 PM »

My 78 CB 750 feels pretty tired in the suspension department. I own multiple bikes, so I'm not really looking for sportbike performance or touring comfort, just a recommendation for a set of decent shocks and fork springs to put some life back into the old girl.

Bootlegger56 · « **Reply #1 on:** June 23, 2013, 08:06:48 PM »

Go read the thoughts of Hondaman in the FAQ section. I am sure there are a lot of opinions but I have been happy with all the mods that I have done that he recommended.

andy750 · « **Reply #2 on:** June 23, 2013, 08:07:31 PM »

I have been very happy with Progressive Springs (heavy duty) on my K4 - have them front/rear.

cheers
Andy

flybox1 · « **Reply #3 on:** June 23, 2013, 08:16:44 PM »

Quote from: andy750 on June 23, 2013, 08:07:31 PM

I have been very happy with Progressive Springs (heavy duty) on my K4 - have them front/rear.

cheers
Andy

+1 on progressives. I have them in my front forks and I have hagons for rear shocks.
Under $300 for everything.

Tripps · « **Reply #4 on:** June 23, 2013, 08:34:37 PM »

Thanks, I have Progressives front and Hagons back on my Rocket Touring, but I didn't know if they even made them for an old Honda like mine.

Shane72 · « **Reply #5 on:** June 23, 2013, 08:43:33 PM »

Hagon.

All the best,

Shane

Tews19 · « **Reply #6 on:** June 24, 2013, 07:46:49 AM »

I ordered a set of progressives for my K1 last week... I thought I would have them today but there is an issue with shipping...... SUmmit is calling me back this afternoon. THey informed me it looks like mid July for delivery!!!!

flybox1 · « **Reply #7 on:** June 24, 2013, 08:10:33 AM »

too bad Tews19.
I picked up mine from this outfit.
shipped same day and i had them in just a few days.
If summit gives you an answer you dont want to hear....

http://www.ebay.com/itm/Progressive-Fork-Springs-Pair-1975-80-Honda-CB750F-11-1104-/180829591820?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item2a1a48990c
(11-1104 is the spring for 69-78 K/F, per Progressive, but the listing title says otherwise.)

brandEn · « **Reply #8 on:** June 24, 2013, 08:34:38 AM »

I ordered mine from Amazon! Cheapest online I could find and with my Prime membership free 2 day shipping.

Harsh · « **Reply #9 on:** June 24, 2013, 09:30:54 AM »

I went a little different direction than most here. I went with Sonic strait rate springs up front and a set of Hagons on the rear.

andy750 · « **Reply #10 on:** June 24, 2013, 10:25:50 AM »

Quote from: Harsh on June 24, 2013, 09:30:54 AM

I went a little different direction than most here. I went with Sonic strait rate springs up front and a set of Hagons on the rear.

This is exactly what I have on my K2. Sonic Springs were 1.0kg, Hagons were the 2810 shocks with adjustable dampening.

Tews19 · « **Reply #11 on:** June 25, 2013, 10:38:57 AM »

Weird summit called me last night about my order. Stated the shipping was off and that I would have today..... well ups dropped them off 20 min ago. Curious did all of you use the spacers provided? If so did you out over the washer and they stick out further then the tube?

flybox1 · « **Reply #12 on:** June 25, 2013, 11:14:51 AM »

yes, I inserted the washer and then the spacer.
not enough preload without them, and my forks nearly bottomed out without.

Tews19 · « **Reply #13 on:** June 25, 2013, 11:17:46 AM »

I contacted progressive. They had me measure. They told me to cut one spacer in half and use for both. Front end still feels spongy but it was almost impossible to use the entire spacer for one fork.

Did you cut in half as progressive recommended?

flybox1 · « **Reply #14 on:** June 25, 2013, 11:36:40 AM »

nope. i used the whole spacer. 30mm IIRC. compressed it with my ratchet and the fork cap and screwed it in using my 6'5" leverage

followed the small sheet of directions indicating the top of the springs should be below the deepest thread, so thats what i did.
still feels a bit soft to me $:-\$

grcamna2 · « **Reply #15 on:** June 25, 2013, 01:42:24 PM »

I've enjoyed using large stacked up flat washers as spacers w/ much success.

bollingball · « **Reply #16 on:** June 25, 2013, 01:54:26 PM »

Quote from: grcamna2 on June 25, 2013, 01:42:24 PM

I've enjoyed using stacked up flat washers as spacers w/ much success.

That sounds very adjustable.

http://www.cyclexchange.net/Frame%20Page.htm

I'm thinking very seriously about cycle-X lowering kit for my 78 I just can't stand this tipy toe any longer. Makes it tough moving it around in the shop. Has anyone with a 78 tried it with the Progressive springs?
Ken

Tripps · « **Reply #17 on:** June 25, 2013, 07:35:16 PM »

Hmm, not hearing good about the Progressives here, truth be told I am not that impressed on my Rocket either, how are the Sonics, those who have them. (this is exactly why I asked for recommendations.)

Tews19 · « **Reply #18 on:** June 25, 2013, 07:45:23 PM »

look into gold valves for the forks. I think racetech sells them.

I took the progressives for a quick ride around my neighborhood. I noticed the front wasn't jumping all over and i could lean more into the corners. Tomorrow if the rain lets up I will give an update.

One thing I noticed is that the front end seems higher.

Tripps · « **Reply #19 on:** June 27, 2013, 05:04:17 AM »

The Progressives were an improvement over stock on my Rocket, but I expected a huge difference, maybe I'm expecting too much, after all, it isn't a sport bike.

andy750 · « **Reply #20 on:** June 27, 2013, 07:26:47 AM »

Quote from: Tripps on June 25, 2013, 07:35:16 PM

Hmm, not hearing good about the Progressives here,

Not from me I really like the front progressives on my K4 - and have them on the rear as well. Used them for the last 40,000 miles and couldnt be happier. So far I have found the straight springs to be a little stiffer (same 10w oil) but dont have enough mileage on them to compare. Old forks are old forks though

Tripps · « **Reply #21 on:** June 27, 2013, 05:33:34 PM »

Quote from: andy750 on June 27, 2013, 07:26:47 AM

Quote from: Tripps on June 25, 2013, 07:35:16 PM
Hmm, not hearing good about the Progressives here,

Not from me I really like the front progressives on my K4 - and have them on the rear as well. Used them for the last 40,000 miles and couldnt be happier. So far I have found the straight springs to be a little stiffer (same 10w oil) but dont have enough mileage on them to compare. Old forks are old forks though

Not sure I understand, do you mean you have Progressive non-progressive shocks? (straight springs)

Grabcon · « **Reply #22 on:** June 27, 2013, 05:54:28 PM »

I would recommend to anyone that is doing suspension work on a new or old bike to pick up a copy of "Race Tech's Motorcycle Suspension Bible". I am not promoting Race Tech or anyone else but this book has a lot of information that will apply to all of the bikes you own.

andy750 · « **Reply #23 on:** June 27, 2013, 07:00:37 PM »

Quote from: Tripps on June 27, 2013, 05:33:34 PM

Not sure I understand, do you mean you have Progressive non-progressive shocks? (straight springs)

Sorry I have 2 bikes - CB750K4 with Progressive springs; CB750K2 with straight springs.

Sorry for the confusion.

Tripps · « **Reply #24 on:** June 27, 2013, 07:40:12 PM »

Ahh, OK. yes, I was looking at your sig, like a girl I used to know, you've been around the block a time or 2

Nice bikes.

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Author Topic: Suspension upgrade recommendations? CB750 (Read 11009 times)

bollingball