News:

This forum is run by RPM and donations from members.

It is the donations of the members that help offset the operating cost of the forum. The secondary benefit of being a contributing member is the ability to save big during RPM Holiday sales. For more information please check out this link: Membership has its privileges 

Thank you for your support of the all mighty FJ.

Main Menu

'84 FJ1100 resto mod

Started by stou, November 11, 2019, 06:49:11 AM

Previous topic - Next topic

FJmonkey

Pat, he would need to cross drill to connect the two ports and then plug the cross drill to seal it up. One of the existing after market plates are made the same way using 2 O-rings.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Pat Conlon

Yes, I remember seeing that, kinda complicated, but your way work wouldn't it?
I wonder if 2 small O rings are stronger in resisting the oil pressure vs the slot and 1 larger O ring.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

FJmonkey

Quote from: Pat Conlon on November 25, 2019, 12:07:21 PM
Yes, I remember seeing that, kinda complicated, but your way work wouldn't it?
I wonder if 2 small O rings are stronger in resisting the oil pressure vs the slot and 1 larger O ring.
Yes, it will work, it is only keeping the fork oil from leaking out while it passes through the groove. Not much pressure to hold back. But the smaller O-ring will have less fluid pushing on it. Think pressure per square Inch. A larger piston will push with greater force than a smaller one, it just won't move as far. In the case of a seal, no movement is the goal.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Pat Conlon

1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

stou

Quote from: Pat Conlon on November 25, 2019, 11:10:49 AM
I don't know what type of pressure is involved with the fork oil, so I suspect it's a good idea going to a O ring design instead of a paper gasket....just a hunch.
Question: If you need to slot the block off plate, how are you going to get a seal with 2 round o rings?
One large O ring like Monkey shows on his plate is the way to go.

That's the beauty of 3D printing. I can design the 2 round holes with the o'ring grooves and a channel in the part to connect the 2 holes. No need to do a cross drill hole, it will be print. I'll do the design later this week and I'll show you.

Pat Conlon

Cool, I look forward to it!

Cheers

Pat
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

Dieselman7.3

Just out of curiosity what do the ports do? You couldn't dead head them?
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

stou

I had some spare time and did the changes to my design. Here's what it look like.

Quote from: Dieselman7.3 on November 25, 2019, 04:32:18 PM
Just out of curiosity what do the ports do? You couldn't dead head them?

This allows the oil to flow and do is work. If the holes are block, it's like the anti-dive is always on and the fork become very hard.

Pat Conlon

Don't need no stinking cross drilling.....very cool. I bet RPM could sell some of those...
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

Motofun

Cool.  The only thing I'd recommend is a proper o ring groove.   :good2:
'69 Honda Trail 90
'75 Honda CB400F
'85 Yamaha RZ350
'85 Yamaha FJ1100
'89 Yamaha FJ1200
'09 Yamaha 125 Zuma
'09 Kawasaki KZ110 (grand kids)
'13 Suzuki GSXR 750 (track)
'14 Yamaha FZ-09
'18 Suzuki GSXR 1000R (track)
'23 Yamaha Tenere 7
SOLD: CBX,RZ500,Ninja 650,CB400F,V45 Sabre,CB700SC,R1

stou

I did the exact same groove like the one on the anti-dive part. It is flat but not deep, so the o'ring is very compressed when the part is bolt on. It should work fine.

Dieselman7.3

[quote/]

This allows the oil to flow and do is work. If the holes are block, it's like the anti-dive is always on and the fork become very hard.
[/quote]

Thanks. I figured it would have been like non anti dive forks if it was dead headed. But makes sense if the ports are there then they'd still be needed... I don't think my anti dives work or atleast not noticeably
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

Pat Conlon

Quote from: Dieselman7.3 on November 26, 2019, 12:28:47 PM
I don't think my anti dives work or at least not noticeably

It is safe to say, you are not alone....
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

stou

Here's the printed part. It's a little bit hard to see the chanel on the photo but there is a 6mm hole between the 2 o'ring holes.


Dieselman7.3

Quote from: Pat Conlon on November 26, 2019, 01:05:19 PM
Quote from: Dieselman7.3 on November 26, 2019, 12:28:47 PM
I don't think my anti dives work or at least not noticeably

It is safe to say, you are not alone....

I remember my old 86 not working correctly either lol.  How effective were they back in the day?
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750