| Author | Message | ||
     Dave_02_1200 |
I seem to remember that there was some kind of insert that added strength (and vibration) to the rear isolators. Does anyone know if such a thing actually exists? Any information would be appreciated. | ||
| Skntpig |
I have them. They were a race part made by Bartels. It's just a billet piece that fills the entire area on the outside of the ISO. It came with longer bolts. No longer made. If they weren't installed I would send you one to measure. | ||
| Drhacknstine |
Skntpig Picts? Please. | ||
| The4ork |
what is a rear isolator? | ||
| Brinnutz |
I'll have some soon to get you pics of. | ||
| Phelan |
I'd be interested too | ||
| Oldog |
what is a rear isolator? the rubber puck that fits between the frame and the motor mounting block a spring pin aligns it on the frame, and a bolt holds it on the mounting block there are 2 that hold the rear of the frame and motor mount, and one the front iso that the motor hangs from. this is the front ISOlator the motor hangs from this  these are the rear isos  they go here }  they are the flexible joints in the uniplanar mounting system invented by Erik Buell. with out these little rubber and steel marvels your buell will shake its self to pieces, quickly I have no experience with the billet spacers that are placed for racing use inside the rear isos, contact American Sport Bike on these Al has the scoop and may have a set, he can most likely get some made. (Message edited by oldog on November 10, 2009) | ||
| Dave_02_1200 |
Skntpig, Do they increase vibration to the point where it could cause other parts to break? I can live with a bit of vibration if it will make my Buell last longer. (I have been riding my Triumph TR6R since 1970 so I know I can live with some vibration) Any information regarding specifications or drawings so I could have a set locally made or a source where I could buy a set would be much appreciated. If I could borrow a set to use as models for my machine shop to reproduce them, that would be best of all. Thanks, Dave | ||
| Gowindward |
I think the whole reason for them being used by the race crews what it stiffens the rear end and chassis connection, so improves handling under racing conditions. IMHO I wouldn't think it would help in the long term health of a street bike. | ||
| Buellistic |
REAR ISOLATOR Aluminum Stiffener Bushings were made by BARTELS PERFORMANCE PRODUCTS and the Part Number is RB4070($24.95 in 1998) ... They were for RACING, which reduced the movement of the swing arm axis ... This was when the RETRO-FIT Isolators PN 47564-86B from the BIG TWIN SOFT TAIL Plate Form were OEM on the BUELL Plate Forms ... These were "CRAP" Isolators, even on a AGGRESSIVE street ridden BUELL and would not cut it riding two up ... "THEY MAKE YOUR BUELL RIDE LIKE A EARLY SPORTSTER(Milwaukee Vibrator) !!!" (Message edited by buellistic on November 11, 2009) | ||
| Road_thing |
I just sold a set of Pingel isolator bushing inserts to a BWB'er. Before I sent 'em off, I measured them and recorded the dimensions. They'd be real easy to duplicate on a lathe. If anybody wants the dimensions, let me know--they're on a pad in the Laboratorio del Entropia del Sud (thanks, Bomber!) at the ranchito. rt | ||
| 80rs427 |
Tom, I'd like a copy of those dimensions. PM sent with request. | ||
| Dave_02_1200 |
Tom, Nice TR6 on your profile. PM sent requesting isolator bushing dimensions. Thanks, Dave | ||
| Ebutch |
Never seen an aluminum iso stiffner any pictures please,I know not made any more.  | ||
| Brinnutz |
I have been told that yes, they do increase vibes btw. | ||
| Jramsey |
1.375 Dia. .875 length .625 thru hole offset .170 from center with a .950-1.00 counterbore .750 deep Leave out the oem flat washer. (Message edited by J.Ramsey on November 13, 2009) | ||
| Road_thing |
I'll get the dimensions on a sketch and post them here over the weekend. If my memory serves me (and I'm not guaranteeing that!) Jramsey's numbers look about right. rt | ||
| Ebutch |
Is oso stiffner a replacement for 3 rubber iso,s which is aluminum disk used in racing used for solid suspension for race?  | ||
| Jramsey |
The bushings are to limit the radial movement of the Iso's between the frame and swingarm/mount block. | ||
| Skntpig |
They do increase vibes some. I don't ride my bike long distances so no biggie for me. Imagine a big fat washer that fills the gap when you look at the side of the iso. Remove the bolt, insert stiffener and reinstall bolt. It fills the gap between the bolt and the round ID of the iso. It feels like the swingarm is more connected to the bike at full lean angle really pushing it. Less lateral movement or wallowing. I'm not sure if you would see a benefit unless your the type of rider that scraps the kickstand and pegs. I'm not sure if they would make the ISOs last longer or not. I will try to get pics posted. Iphone sux for putting pics on here. | ||
| Skntpig |
Not the best pic but the only one I could find.  | ||
| Ebutch |
Gotcha : Skntpig.Now at least I know what they look like.Take good care of those Bowser's!!  | ||
| Joesbuell |
I made a set for my S3, And was warned of the extra vibs.....I now hear the people saying I told you so!! way to much vibs for a street bike! | ||
| Dave_02_1200 |
Now I am wondering if it might make sense to make a set of isolator stiffeners out of hard rubber. The idea would be that they would not transmit as much vibration as the aluminum ones but might offer some added support for the rear isolators that could limit extreme movement and add to their longevity. Could this work or have I just had too much coffee? | ||
| Joesbuell |
The rear isolators last near on forever! it's the front ones that flog out regularly! | ||
| Ebutch |
195,000 miles on two Buells one rear iso torn!When it went more vibes and felt like frame was broken.  | ||
| Skntpig |
I think if you made them in any material they would still accomplish the same things. Stronger more rigid mount at the sacrifice of more vibes. The vibes aren't so bad that it makes me want to take them out and have a loosey goosey frame/swingarm again. Ladies Love It!  | ||
| Road_thing |
Here's what the Pingel versions look like in real life:  Mine were made out of aluminum. I doubt that the grade or heat treatment matters much. These would be real easy to make. rt EDITED (Twice)TO CORRECT A MATH ERROR: The offset from CL of the holes should be 0..17+/-. Thanks to Jramsey for making me doublecheck! I've deleted the incorrect drawings and posted the (hopefully) correct one below. (Message edited by road_thing on November 13, 2009) (Message edited by road_thing on November 14, 2009) | ||
| Bud |
http://twinmotorcycles.nl/webshop/artikel.asp?guid =YXHFSC&aid=953&cid=0&s=isolator&a= free Spirits still makes theme | ||
| Jramsey |
Tom, We were both off on the center hole offset, I was eyeballing a used Iso to get the rough measurements. Center hole offset is .167 - .170. A .950 or 1.00 counterbore can't be offset .250 or .400 because it would put the counterbore out side the 1.375 OD. I set up a pair of new Iso's on the mill and measured them with the DRO. Optical illusion I guess being two different size holes and the smaller one offset. I edited my earlier post with the correct offset measurement. James |
