Topic: CB750 K5 Swingarm Bushing Question??

[grepper]

Yes, another swingarm thread..  I searched and didn't find exactly what I was looking for.

The bike is a 1975 cb750K.

I started taking the old bushings out.  In the first attachment parts #12 and #8 just fell apart.

So it looks like from the picture (vintagecb750.com) part #28-1025 just replaces part #7.

So do I have to source out the #12 and #8 or should I buy part# 28-1026 that has the little hat part??

[Redrider969]

I bought a set of those bushings with the "lip" on them.  The set I bought was not a press fit - they slid right in.  Too loose in other words.  I ended up sending my swingarm to Mark Paris (AKA Hondaman) for a set of his custom made bushings. 

Mark's book (My Honda CB750) has a great section in it about swingarm bushings.  The book isn't cheap, but it's the absolute bible for anyone rebuilding a CB750.  Best money I've even spent on my bike.

[bjbuchanan]

It depends on the kind of bushing you have. If it looks like a top hat then those two pieces go away and the final cap thing is retained. As far as I understand tho I hope i'm not misleading you

You more than likely have that top hat/collar style that is the predominant bushing

[CycleRanger]

If you use the bronze bushings you will not need #8 and #12.

[grepper]

I’d like to note that I’ve done bronze swingarm  bushings before on other bikes, I have a good idea on how to do it right.

Redrider969:  Mark's Book is definitely on my ‘To Buy’ list.  As for paying him to do the swing arm for me, $200 is a bit much for what I want to pay.  I definitely don't want to buy a part that doesn't fit tight.  Thanks for the tip.

Bjbuchanan:  What I found when taking it apart was just like the parts diagram.   I'm not sure what you're saying.

CycleRanger:  So are you saying I should get part #28-1025?  Then what of the #8 little plastic part that I don’t need any longer? The swingarm won’t be snug anymore.

[CycleRanger]

CycleRanger:  So are you saying I should get part #28-1025?  Then what of the #8 little plastic part that I don’t need any longer? The swingarm won’t be snug anymore.

No, get the #28-1026, the shouldered bushings and you will no longer need the plastic "top hat" piece and the felt ring.

[iron_worker]

As CycleRanger said... the earlier model bikes used the straight bushings with felt dust seals and plastic thrust washers. The later model bikes used a shouldered bushing to have the bushing and thrust all in one piece (and no seal).

http://www.cmsnl.com/honda-cb750k6-four-canada_model14381/partslist/F19.html#results  (from a K6)

The CMSNL diagram you show is from an earlier bike. I'm not sure that the inner diameters of the swing arms are the same but CycleRanger seems to think so. Maybe someone else can confirm that.

IW

[CycleRanger]

As CycleRanger said... the earlier model bikes used the straight bushings with felt dust seals and plastic thrust washers. The later model bikes used a shouldered bushing to have the bushing and thrust all in one piece (and no seal).

http://www.cmsnl.com/honda-cb750k6-four-canada_model14381/partslist/F19.html#results  (from a K6)

The CMSNL diagram you show is from an earlier bike. I'm not sure that the inner diameters of the swing arms are the same but CycleRanger seems to think so. Maybe someone else can confirm that.

IW

I installed the shouldered bronze bushings in my K5 and they fit fine.
The exact same bushings also fit in my CJ360T.

[grepper]

Thanks CycleRanger,

I'm a ways away from actually doing the job.  At this point I'm just disassembling and makeing my list of the parts I need.

[SOHC4 Cafe Racer Fan]

I have a repro-Dresda boxed swingarm - mating to a CB750K2 frame.  I'm wondering if the shouldered bushings will be the best way to go.

[Cruzader]

Bump for info

I have found out that I bought the shouldered bushings made for later model cb750's. Can I use this type of bushing in my k1? If so, why is there a difference?

[bjbuchanan]

Should be alright, the shoulder eliminates the need for felt washer on some of them. With flanged bushing you have that metal/rubber cap and then the bushing for the swinger, simple and straight

[Stoli]

FYI - There is a guy in Germany who sells those bushings for $30 delivered. I've used both his and the brand that vintagecb750 sells and can't tell the difference in quality.

http://www.ebay.com/itm/Honda-CB-250-360-400-500-550-750-Four-swingarm-bronze-bushing-set-bearing-new-/280818288488?pt=Motorcycles_Parts_Accessories&hash=item4162130768&vxp=mtr

It might take an extra few days from Germany but as I recall, they arrived much quicker than expected as the seller ships them out very quickly.

[Cruzader]

Should be alright, the shoulder eliminates the need for felt washer on some of them. With flanged bushing you have that metal/rubber cap and then the bushing for the swinger, simple and straight

Thank you! That's what I was hoping, since I have already installed them in the swing arm.

I have read elsewhere that I should grease the swingarm more frequently using the shouldered bushings because of the difference in design between the early and late model swingarms.

[70CB750]

FYI - There is a guy in Germany who sells those bushings for $30 delivered. I've used both his and the brand that vintagecb750 sells and can't tell the difference in quality.

http://www.ebay.com/itm/Honda-CB-250-360-400-500-550-750-Four-swingarm-bronze-bushing-set-bearing-new-/280818288488?pt=Motorcycles_Parts_Accessories&hash=item4162130768&vxp=mtr

It might take an extra few days from Germany but as I recall, they arrived much quicker than expected as the seller ships them out very quickly.

+1 on Kenosha Kid bushings

[CycleRanger]

FYI - There is a guy in Germany who sells those bushings for $30 delivered. I've used both his and the brand that vintagecb750 sells and can't tell the difference in quality.

http://www.ebay.com/itm/Honda-CB-250-360-400-500-550-750-Four-swingarm-bronze-bushing-set-bearing-new-/280818288488?pt=Motorcycles_Parts_Accessories&hash=item4162130768&vxp=mtr

It might take an extra few days from Germany but as I recall, they arrived much quicker than expected as the seller ships them out very quickly.

+1 on Kenosha Kid bushings

+2 

[Ericcb750]

I also used a set of those "part's plus" bronze bushings from CB750 supply. I do have a 78 cb750 so I think the actual setup might be a bit different but they worked great. I stuck them in the freezer for a night and after getting the swingarm powdercoated I used a rubber mallet to bang them in. I didn't need either of those #12 or #8 but It was the top hat style that I got, It might be different. I just wanted to let you know the quality of those is really good.  All that I needed was the little plastic/rubbery cap that I think is there to help keep dirt and stuff out and also keep it a little cushioned. Hope this helps.

[bjbuchanan]

You "need" to grease more bc of the pivot bolt design. Very early models had grease fittings on end, not just the single center one. Idea is it greases better. While apart dremel swirkes in to the bolt as grease passages so it lubes better. Replace with a regular metric zero that threads rifht in, the generic ones work just fine

[Cruzader]

You "need" to grease more bc of the pivot bolt design. Very early models had grease fittings on end, not just the single center one. Idea is it greases better. While apart dremel swirkes in to the bolt as grease passages so it lubes better. Replace with a regular metric zero that threads rifht in, the generic ones work just fine

I'm not sure what you mean by most of your post. Do you have a diagram or can you direct me to another thread explaining it differently?