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Discussion Starter #1
Does anyone have a way to upgrade the front suspension? I've got the rear just about as close to perfect as I can get with the shocks at 3 and the darksided 165-60/14 tire at 38 psi. But the front just isn't what it needs to be. I don't know how I can get it to handle bumps better and be smoother all around. The back is perfect like I said. Just need the front. Tried reading older posts on it but got confused fast.
 

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Read my sig line.
Don't do like me, just get some springs that suit your weight, maybe just longer spacers, experiment with oil according to taste and call it quits.

Suspension-wise, the Burgman 650 is a bike with the front fork lowered as much as possible, leaving only 3 inches of effective fork travel, less than half of normal for street going bikes.
The reason we can't have more travel is the small wheels combined with the wide and low foot-boards. The small wheels are also much worse at absorbing bumps than larger wheels.
The only way to gain fork travel is by raising the ride height front and back to keep the angles, but many have already problems with the seat height as it is.
 

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Discussion Starter #3
So how could I get the right springs/ spacers? And what would be the difference in oil weight?
 

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Discussion Starter #5
How long of spacers? And is that a special weight of oil? How can I find what's exactly right for me?
 

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Too much tinkering will spoil this great bike, learn to live with it or upgrade Fork Springs and tweak oil suitably.

I have done same and find the bike a top handler, OK can be choppy on oddly spaced undulations in certain sections of road but apart from a bit of discomfort it is no big deal.

WM
 

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Discussion Starter #8
I just know like with gearing you don't try every sprocket to see what works. There's usually a guide line. Like a 10 weight will act like this and a 15 will act like that. You know. I don't want to re do my forks every week to see which I like.
 

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GK13 unfortunately there is no guide line in dealing with fork oil as each and every one of us is different in weight and consequently how the fork forks react to that. The same is true of the fork springs and preload. Like ErikDK says you have to experiment with the forks to fine tune what your are looking for. I understand that's not the answer you were probably looking for but that's how it is unfortunately.

Greg
 

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Fork oil is not a well regulated industry. Even with the same manufacture sometimes one 10 weight is as thick as anothers 5 weight.

I did some research on automatic transmission fluids. Dexron lll is like a 8 weight, the old Type F (Ford) is a light 10 weight. But I found out that the Chrysler spec ATF+4 is a heaver 10 weight. These ARE regulated and must meet spec's set down by the car manufactures.

In my 650 I replaced my stock springs and the steel spacers with longer springs out of a 81 GoldWing and I cut them so they are about 1/2 inch longer than the stock spring with the steel spacers. It took a bit of effort getting the springs cap back on the forks. I filled them with ATF+4. To me, MUCH BETTER.
 

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Discussion Starter #11
Ok. Thank you Dave_J. I'll get that same oil. What was the before and after feeling? Smoother? Less bumpy and hard?
 

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Fork oil is not a well regulated industry. Even with the same manufacture sometimes one 10 weight is as thick as anothers 5 weight.

I did some research on automatic transmission fluids. Dexron lll is like a 8 weight, the old Type F (Ford) is a light 10 weight. But I found out that the Chrysler spec ATF+4 is a heaver 10 weight. These ARE regulated and must meet spec's set down by the car manufactures.

In my 650 I replaced my stock springs and the steel spacers with longer springs out of a 81 GoldWing and I cut them so they are about 1/2 inch longer than the stock spring with the steel spacers. It took a bit of effort getting the springs cap back on the forks. I filled them with ATF+4. To me, MUCH BETTER.
Hey Dave, new member here. I just bought a 2007 650 with less than 5000 miles on it. I rode it about 40 miles home, mostly interstate, and the front end beat my arms to death. I am a former Honda Motorcyle Mechanic from the seventies and have never experienced this in over 1000 different motorcycles. I have not really checked anything yet but was trying to gain an education through reading. I have ordered a 2004 set of used forks to experiment with and I am a machinist with access to everything. Based on my reading, here is my first plan. Get a used set of GL1000 straight springs. Add a 1" spacer and longer bolt to the bottom of the sliders and cut the springs to give me the proper preload and use some atf like you recommend. Your thoughts, what ever they may be!
Thanks
 

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Hey Dave, new member here. I just bought a 2007 650 with less than 5000 miles on it. I rode it about 40 miles home, mostly interstate, and the front end beat my arms to death. I am a former Honda Motorcyle Mechanic from the seventies and have never experienced this in over 1000 different motorcycles. I have not really checked anything yet but was trying to gain an education through reading. I have ordered a 2004 set of used forks to experiment with and I am a machinist with access to everything. Based on my reading, here is my first plan. Get a used set of GL1000 straight springs. Add a 1" spacer and longer bolt to the bottom of the sliders and cut the springs to give me the proper preload and use some atf like you recommend. Your thoughts, what ever they may be!
Thanks
aaalaaan , could you shoot pics and give a step by step on how you do your mod ...I’d love to have it done to my 2006.
 

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Aaalaan, welcome to the forums.

The GL1000 front springs may be too small diameter. The Burgmans forks are 41mm.

But you are getting a spare set of Burgman forks so just cut some of its spring off and put a steel washer between the two springs.

The 1 inch spacer at the bottom of the inner fork tube limiter (#15 in 3rd picture) will add a like amount of travel. So if you re-spring it to get the SAG down then you will have that travel.
Another member posted this picture

Fork tube extension.jpg


2004 Dampener.jpg


Fork tube limiter.jpg
Fork Tube.jpg
 

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Hey Dave,

I have not purchased the springs yet, so I can go with any size.I saw that diagram before and that gave me the idea. Do you think one long spring would be better? Most motorcycles do not use such a long spacer. With the extra inch of travel that I am gaining, should I go with straight or progressive? I am looking for a cushy ride and no longer push the performance of a bike and now it is just a transportation tool with enough power to get me out of trouble if needed.I got the Gold Wing spring idea from you but I have not really checked any dimensions yet. My used forks are on their way.
Another person thought that hydraulic lock was the cause. But I have to do something because the extreme harshness is unbearable. Of all the motorcyles that I have owned, I have never made a suspension modification. So I am not real picky but this front is like totally solid running a non pneumatic tire. I bought it from a dealer and have not even checked the air in the tire, they were supposed to do all that but the front tire is either over inflated or has a really stiff sidewall. They are both the original tires with an 01/07 date code. I have heard Pirellis are more cushy. So I am just getting started on this but I am determined to figure it out. Thanks for your help.
 

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I used GL 1100 springs. They are for 39mm fork tubes. The GL1000 are 37mm so 4 mm of slop is too much.

I have not looked at all these for spring lengths but all these are for 41mm diameter tubes.

41 Honda CR-250R (81)
41 Honda XR-250L (91-96)
41 Honda XR-250R (86-89)
41 Honda XR-250R (90-04)
41 Honda XR-350R (83)
41 Honda XR-350R (84)
41 Honda XR-350R (85)
41 Honda CB-400F (89-90)
41 Honda CR-450R (81)
41 Honda CBR-600F2 (91-94)
41 Honda CBR-600SE (98 )
41 Honda XL-600V "Transalp" (89-90)
41 Honda NT-650 "Hawk GT" (89-91)
41 Honda NX-650 (88-89)
41 Honda CB-750 "Nighthawk" (91-03)
41 Honda RVF-720R (94)
41 Honda VF-750C "Magna" (94-03)
41 Honda VF-750C2 "Magna Deluxe" (97-00)
41 Honda VFR-750F (90-97)
41 Honda VT-750CDA/B/C/D "Shadow American Classic Ed. Deluxe"
(03)
41 Honda VT-750DC (01-03)
41 Honda PC-800 (89-90, 94-98 )
41 Honda CBR-1000F "Hurricane" (87-91, 93-96)
41 Honda VF-1000F "Interceptor" (84)
41 Honda VTR-1000F "Super Hawk" (98-04)
41 Honda ST-1100 (91-02)
41 Honda VF-1100C "V65 Magna" (83-86)
41 Honda VT-1100C "Shadow 1100" (85-90, 92-96)
41 Honda VT-1100C2 (95-99)/ C2-2 (97) "Shadow 1100 American
Classic Ed."
41 Honda VT-1100C3 "Shadow Aero" (98-02)
41 Honda VT-1100D2 "Shadow 1100 American Classic Ed." (99)
41 Honda VT-1100T "Shadow 1100 American Classic Ed. Tourer"
(98-00)
41 Honda GL-1200 "Goldwing" (84)
41 Honda GL-1200 I "Interstate" (84-87)
41 Honda GL-1200L "Ltd" (85)
41 Honda VTX-1300C (04)
41 Honda GL-1500 "Goldwing" (88-90)
41 Honda GL-1500I "Interstate" (91-96)
41 Kawasaki KX-125 B1 (82)
41 Kawasaki KX-125 H1 (90)
41 Kawasaki KDX-200E5-E6 (93-94)
41 Kawasaki KX-250H1 (90)
41 Kawasaki KXT-250B1 (86)
41 Kawasaki EN-500C1-C8 "Vulcan 500 Ltd" (96-03)
41 Kawasaki EN-500C9 "Vulcan 500 Ltd" (04)
41 Kawasaki KX-500 E2 (90)
41 Kawasaki ZX-600D1-D4 "Ninja (ZX-6)" (90-93)
41 Kawasaki ZX-600E1-E12 "Ninja (ZX-6)" (93-04)
41 Kawasaki ZX-600F1-F3 "Ninja (ZX-6R)" (95-97)
41 Kawasaki ZR-750C1-C3 (91-93)
41 Kawasaki ZR-750F2 (00)
41 Kawasaki ZX-750K1/K2 "Ninja (ZX-7R)" (91-92)
41 Kawasaki ZX-750L2-L3 "Ninja (ZX-7)" (94-95)
41 Kawasaki VN-800 A1-A10 "Vulcan" (95-04)
41 Kawasaki VN-800 B1-B9 "Vulcan Classic" (96-04)
41 Kawasaki VN-800 C1-C2 "Vulcan Drifter" (99-00)
41 Kawasaki ZX-900B1-B4 "Ninja (ZX-9R)" (94-97)
41 Kawasaki ZG-1000A1-A13 "Concours" (86-98 )
41 Kawasaki ZG-1000A14-A19 (99-04)
41 Kawasaki ZR-1000A1/A2 (03-04)
41 Kawasaki ZX-1000B1-B3 "Ninja (ZX-10)" (88-90)
41 Kawasaki ZX-1100E1-E3 "GPz 1100" (95-97)
41 Kawasaki ZG-1200A1/B1-B17 "Voyager XII" (86-03)
41 Kawasaki KZ-1300A1-A4 (79-82)
41 Kawasaki ZN-1300A1-A6 "Voyager" (83-88 )
41 Kawasaki VN-1500A1-A5 "Vulcan 88/Vulcan 1500"(87-91),
VN-1500 B1-B4"Vulcan 88 SE" (87-90)
41 Kawasaki VN-1500A6-A13 (92-99)
41 Kawasaki VN-1500 D1-D2 "Vulcan 1500 Classic" (96-97)
41 Kawasaki VN-1500 E1-E7 "Vulcan 1500 Classic" (98-04)
41 Kawasaki VN-1500 G1/G1A/G2 "Vulcan 1500 Nomad" (99-00)
41 Kawasaki VN-1500J1-J2 "Vulcan 1500 Drifter" (99-00)
41 Kawasaki VN-1500 L1-L5 "Vulcan 1500 Nomad Fi" (00-04)
41 Kawasaki VN-1500N1-N3 "Vulcan 1500 Classic Fi" (00-02)
41 Kawasaki VN-1500R1-R4 "Vulcan 1500 Drifter" (01-04)
41 Suzuki RM-125 L (90)
41 Suzuki RM-125 L (90)
41 Suzuki RM-250 K/L (89-90)
41 Suzuki RM-250 K/L (89-90)
41 Suzuki RMX-250 K/L (89-90)
41 Suzuki RMX-250 K/L (89-90)
41 Suzuki AN-400 K3/K4 (03-04)
41 Suzuki GSF-400 M/N/P "Bandit" (91-93)
41 Suzuki GSF-600 ST/SV/SW "Bandit" (96-98 )
41 Suzuki GSF-600 ST/SV/SW "Bandit" (96-98 )
41 Suzuki GSF-600 SX//SY/SK1/SK2/SK3 "Bandit" (99-03)
41 Suzuki GSX-600 FJ "Katana" (88 )
41 Suzuki GSX-600 FK/FL/FM "Kata
 

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I won't stop you doing fork mods (the opposite, actually) but why don't you check for correct preload and oil level before you adventuring in modding?
 

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I won't stop you doing fork mods (the opposite, actually) but why don't you check for correct preload and oil level before you adventuring in modding?
Okay, good idea, I will try that, but after all that I had read there seemed to be some real design issues. Thanks
 

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I used GL 1100 springs. They are for 39mm fork tubes. The GL1000 are 37mm so 4 mm of slop is too much.

I have not looked at all these for spring lengths but all these are for 41mm diameter tubes.

41 Honda CR-250R (81)
41 Honda XR-250L (91-96)
41 Honda XR-250R (86-89)
41 Honda XR-250R (90-04)
41 Honda XR-350R (83)
41 Honda XR-350R (84)
41 Honda XR-350R (85)
41 Honda CB-400F (89-90)
41 Honda CR-450R (81)
41 Honda CBR-600F2 (91-94)
41 Honda CBR-600SE (98 )
41 Honda XL-600V "Transalp" (89-90)
41 Honda NT-650 "Hawk GT" (89-91)
41 Honda NX-650 (88-89)
41 Honda CB-750 "Nighthawk" (91-03)
41 Honda RVF-720R (94)
41 Honda VF-750C "Magna" (94-03)
41 Honda VF-750C2 "Magna Deluxe" (97-00)
41 Honda VFR-750F (90-97)
41 Honda VT-750CDA/B/C/D "Shadow American Classic Ed. Deluxe"
(03)
41 Honda VT-750DC (01-03)
41 Honda PC-800 (89-90, 94-98 )
41 Honda CBR-1000F "Hurricane" (87-91, 93-96)
41 Honda VF-1000F "Interceptor" (84)
41 Honda VTR-1000F "Super Hawk" (98-04)
41 Honda ST-1100 (91-02)
41 Honda VF-1100C "V65 Magna" (83-86)
41 Honda VT-1100C "Shadow 1100" (85-90, 92-96)
41 Honda VT-1100C2 (95-99)/ C2-2 (97) "Shadow 1100 American
Classic Ed."
41 Honda VT-1100C3 "Shadow Aero" (98-02)
41 Honda VT-1100D2 "Shadow 1100 American Classic Ed." (99)
41 Honda VT-1100T "Shadow 1100 American Classic Ed. Tourer"
(98-00)
41 Honda GL-1200 "Goldwing" (84)
41 Honda GL-1200 I "Interstate" (84-87)
41 Honda GL-1200L "Ltd" (85)
41 Honda VTX-1300C (04)
41 Honda GL-1500 "Goldwing" (88-90)
41 Honda GL-1500I "Interstate" (91-96)
41 Kawasaki KX-125 B1 (82)
41 Kawasaki KX-125 H1 (90)
41 Kawasaki KDX-200E5-E6 (93-94)
41 Kawasaki KX-250H1 (90)
41 Kawasaki KXT-250B1 (86)
41 Kawasaki EN-500C1-C8 "Vulcan 500 Ltd" (96-03)
41 Kawasaki EN-500C9 "Vulcan 500 Ltd" (04)
41 Kawasaki KX-500 E2 (90)
41 Kawasaki ZX-600D1-D4 "Ninja (ZX-6)" (90-93)
41 Kawasaki ZX-600E1-E12 "Ninja (ZX-6)" (93-04)
41 Kawasaki ZX-600F1-F3 "Ninja (ZX-6R)" (95-97)
41 Kawasaki ZR-750C1-C3 (91-93)
41 Kawasaki ZR-750F2 (00)
41 Kawasaki ZX-750K1/K2 "Ninja (ZX-7R)" (91-92)
41 Kawasaki ZX-750L2-L3 "Ninja (ZX-7)" (94-95)
41 Kawasaki VN-800 A1-A10 "Vulcan" (95-04)
41 Kawasaki VN-800 B1-B9 "Vulcan Classic" (96-04)
41 Kawasaki VN-800 C1-C2 "Vulcan Drifter" (99-00)
41 Kawasaki ZX-900B1-B4 "Ninja (ZX-9R)" (94-97)
41 Kawasaki ZG-1000A1-A13 "Concours" (86-98 )
41 Kawasaki ZG-1000A14-A19 (99-04)
41 Kawasaki ZR-1000A1/A2 (03-04)
41 Kawasaki ZX-1000B1-B3 "Ninja (ZX-10)" (88-90)
41 Kawasaki ZX-1100E1-E3 "GPz 1100" (95-97)
41 Kawasaki ZG-1200A1/B1-B17 "Voyager XII" (86-03)
41 Kawasaki KZ-1300A1-A4 (79-82)
41 Kawasaki ZN-1300A1-A6 "Voyager" (83-88 )
41 Kawasaki VN-1500A1-A5 "Vulcan 88/Vulcan 1500"(87-91),
VN-1500 B1-B4"Vulcan 88 SE" (87-90)
41 Kawasaki VN-1500A6-A13 (92-99)
41 Kawasaki VN-1500 D1-D2 "Vulcan 1500 Classic" (96-97)
41 Kawasaki VN-1500 E1-E7 "Vulcan 1500 Classic" (98-04)
41 Kawasaki VN-1500 G1/G1A/G2 "Vulcan 1500 Nomad" (99-00)
41 Kawasaki VN-1500J1-J2 "Vulcan 1500 Drifter" (99-00)
41 Kawasaki VN-1500 L1-L5 "Vulcan 1500 Nomad Fi" (00-04)
41 Kawasaki VN-1500N1-N3 "Vulcan 1500 Classic Fi" (00-02)
41 Kawasaki VN-1500R1-R4 "Vulcan 1500 Drifter" (01-04)
41 Suzuki RM-125 L (90)
41 Suzuki RM-125 L (90)
41 Suzuki RM-250 K/L (89-90)
41 Suzuki RM-250 K/L (89-90)
41 Suzuki RMX-250 K/L (89-90)
41 Suzuki RMX-250 K/L (89-90)
41 Suzuki AN-400 K3/K4 (03-04)
41 Suzuki GSF-400 M/N/P "Bandit" (91-93)
41 Suzuki GSF-600 ST/SV/SW "Bandit" (96-98 )
41 Suzuki GSF-600 ST/SV/SW "Bandit" (96-98 )
41 Suzuki GSF-600 SX//SY/SK1/SK2/SK3 "Bandit" (99-03)
41 Suzuki GSX-600 FJ "Katana" (88 )
41 Suzuki GSX-600 FK/FL/FM "Kata
Dave, thanks for all the info. I will find some long ones, designed for similar weight, so that I can cut them to length.
 
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