switching to progressive coil over rear shocks


Information and questions on GL1200 Goldwings (1984-1987)
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roadwanderer2
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Motorcycle: previously owned 83 GL1100A aspencade traded for a motorhome, 1981 honda GL500i silverwing interstate, 1974 yamaha xs400, 1974 Honda cb450 twin cam, 1983 honda vt30, 1982 honda 700 shadow, 1972 cb750four, and my first bike, a brand new 1982 honda CM400e. now own-1986 GL1200 aspencade SEi
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switching to progressive coil over rear shocks

Post by roadwanderer2 »



i've been thinking about changing the rear shocks on my SEi going from air to progressive 412 coil-over manual adjustable rear shocks. anyone have any opinions, pros or cons about them?

stuart.


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Rednaxs60
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Ontario 1985 GL1200 LTD (sold)

Re: switching to progressive coil over rear shocks

Post by Rednaxs60 »

Stuart - have replaced the rear air shocks on my '85 LTD with progressive shocks. Parts are:

Progressive suspension rear shocks 1200 - 76-1206B
Progressive suspension rear shock springs - 76-1364B

The ride and performance is extremely good both one and two up. I have them set on the 4th preload adjustment at all times. The only issue (quite minor) is that these are slightly longer than the air shocks and when the bike is on the centre stand the rear wheel is still on the ground. To compensate for this I will put a 1/4 to 1/2 inch piece of plywood under the centre stand. I only do this when I have to such as when I am working on the bike, otherwise I use the side stand. You do have to remove the saddlebags to adjust the preload.

As an aside, just put new Michelin Commander II tires front and rear on. Use Ride-On Tire Balancer and Sealant - 8oz in the front and rear tires. Was using Counter Act beads but prefer the Ride-On product. Check out the you tube regarding this product, it is impressive. No more ugly silver weights on the bike wheels.

Cheers
"When you write the story of your life, don't let anyone else hold the pen"

Ernest
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roadwanderer2
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Re: switching to progressive coil over rear shocks

Post by roadwanderer2 »

hey Ernest, all this information is good to know, but 2 questions.......did you install the standard or heavy duty shocks, and with the shocks set on number 4, how does your bike ride.

stuart.
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Rednaxs60
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Re: switching to progressive coil over rear shocks

Post by Rednaxs60 »

Stuart - out and about on the bike this morning, will get back to you. Have received an answer from the company in the UK that has shocks for our bikesand may be an alternative to the Progressive shock. Will get you this information as well. Their web sit is www.bitzforbikes.com.

Bike rides quite well with the preload on the 4th adjustment. Don't have to change when I ride dual.

Cheers
"When you write the story of your life, don't let anyone else hold the pen"

Ernest
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roadwanderer2
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Contact:

Re: switching to progressive coil over rear shocks

Post by roadwanderer2 »

Rednaxs60 wrote:Stuart - out and about on the bike this morning, will get back to you. Have received an answer from the company in the UK that has shocks for our bikesand may be an alternative to the Progressive shock. Will get you this information as well. Their web sit is http://www.bitzforbikes.com.

Bike rides quite well with the preload on the 4th adjustment. Don't have to change when I ride dual.

Cheers
now see, thats the information i was looking for. i want to be able to set the preload and be comfortable whether im riding one or 2 up. as for that site you gave me the link to, i can't find anything for the rear shocks be them for the 85 or the 86 1200. BTW, i meant to ask you, did you get the standard or heavy duty shocks.

stuart.
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wongsol
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Re: switching to progressive coil over rear shocks

Post by wongsol »

I've read a number of the articles posted for GL1100 and GL1200, my current is an 84 GL1200 that has no bags or windshield.

I've rebuilt the air shocks a couple of times and not happy with the ride. I want to do the same as the OP here and switch to coil over Progressives. My question regarding the 412 series is the 4226 is recommended but because I don't have the weight as the stock bike and I rarely carry a passenger, I'd like to go with a lower shock in the 412 series. Are the eyelets on all 412's the same meaning I can go to a lower ride shock easily or would there need to be mods done or is just a pain the behind and stick with the normal 14.25" travel the 412-4226's are.

TIA
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Rednaxs60
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Ontario 1985 GL1200 LTD (sold)

Re: switching to progressive coil over rear shocks

Post by Rednaxs60 »

I believe the 1200 air shocks are 13.75 inch eye to eye (centre). The Progressives that I have posted are 14.5 inches eye to eye (centre). There is no change or mods required to install. The only issue is that the rear tire will touch the ground when on the centre stand. I have noticed no difference in the ride, solo or two up.
"When you write the story of your life, don't let anyone else hold the pen"

Ernest
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Goldenponyboy
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Re: switching to progressive coil over rear shocks

Post by Goldenponyboy »

Rednaxs60 wrote: Tue Mar 23, 2021 11:12 pm I believe the 1200 air shocks are 13.75 inch eye to eye (centre). The Progressives that I have posted are 14.5 inches eye to eye (centre). There is no change or mods required to install. The only issue is that the rear tire will touch the ground when on the centre stand. I have noticed no difference in the ride, solo or two up.
Hey Ernest is your bike back together again and on the road?
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Rednaxs60
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2012 Suzuki DL1000 VStrom (sold)
2008 GL1800 (sold)
Ontario 1985 GL1200 LTD (sold)

Re: switching to progressive coil over rear shocks

Post by Rednaxs60 »

Yes it is. Have some small issues such as finding out why the fast idle on cold start is not quite right, new rear shocks coming - Hagon with the remote preload adjustment. Had an issue with the FD. There has always been a "clunk" in the rear end mostly when starting out in first. Checked the FD and it was out of spec. Was going to change the various shims but instead got a 1500 rear end, FD and all the bits - already had the rear wheel, and changed out the 1200 FD for a 1500 FD. Used the 1200 rear wheel, caliper mount and axle, with spacers, fits and works well. Did use the 1500 FD spacer instead of the one for the 1200. The 1500 FD spacer is a bit longer. Had to drill out the swing arm bolt holes for the larger bolts on the 1500 FD, used the 1200 prop shaft as well. No need to install the 1500 rear wheel, caliper mount until necessary.
"When you write the story of your life, don't let anyone else hold the pen"

Ernest
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Re: switching to progressive coil over rear shocks

Post by Goldenponyboy »

Rednaxs60 wrote: Sat Mar 27, 2021 8:10 pm Yes it is. Have some small issues such as finding out why the fast idle on cold start is not quite right, new rear shocks coming - Hagon with the remote preload adjustment. Had an issue with the FD. There has always been a "clunk" in the rear end mostly when starting out in first. Checked the FD and it was out of spec. Was going to change the various shims but instead got a 1500 rear end, FD and all the bits - already had the rear wheel, and changed out the 1200 FD for a 1500 FD. Used the 1200 rear wheel, caliper mount and axle, with spacers, fits and works well. Did use the 1500 FD spacer instead of the one for the 1200. The 1500 FD spacer is a bit longer. Had to drill out the swing arm bolt holes for the larger bolts on the 1500 FD, used the 1200 prop shaft as well. No need to install the 1500 rear wheel, caliper mount until necessary.
Thats great that you got it back together and on the road. I will look into servicing my back shocks soon now that the front is done and ready for the summer. I cant find much about the Hagon shocks on their site. What is the benefit to the 1500 FD? I have the same clunk.
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Rednaxs60
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Joined: Wed Nov 18, 2015 12:44 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1985 GL1200 LTD
2014 Can-Am Spyder RT LE
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2012 Suzuki DL1000 VStrom (sold)
2008 GL1800 (sold)
Ontario 1985 GL1200 LTD (sold)

Re: switching to progressive coil over rear shocks

Post by Rednaxs60 »

Goldenponyboy wrote: Sun Mar 28, 2021 12:01 am
Rednaxs60 wrote: Sat Mar 27, 2021 8:10 pm Yes it is. Have some small issues such as finding out why the fast idle on cold start is not quite right, new rear shocks coming - Hagon with the remote preload adjustment. Had an issue with the FD. There has always been a "clunk" in the rear end mostly when starting out in first. Checked the FD and it was out of spec. Was going to change the various shims but instead got a 1500 rear end, FD and all the bits - already had the rear wheel, and changed out the 1200 FD for a 1500 FD. Used the 1200 rear wheel, caliper mount and axle, with spacers, fits and works well. Did use the 1500 FD spacer instead of the one for the 1200. The 1500 FD spacer is a bit longer. Had to drill out the swing arm bolt holes for the larger bolts on the 1500 FD, used the 1200 prop shaft as well. No need to install the 1500 rear wheel, caliper mount until necessary.
Thats great that you got it back together and on the road. I will look into servicing my back shocks soon now that the front is done and ready for the summer. I cant find much about the Hagon shocks on their site. What is the benefit to the 1500 FD? I have the same clunk.
The benefit is I did not have to fool around with the 1200 FD. There are two shims/spacers that have to be adjusted, one for the main gear and the other is the pinion spacer. It's a trial and error issue. Change one, check, adjust if required. Make sure the other spacer is adjusted properly. If you are changing the pinion spacer, the pinion bearing has to be pulled off, then pressed back on for each spacer change. Could find the spacers in the US or from CMS in the Netherlands, non found in Canada.

Before I took the 1200 FD off, could move the wheel approximately 8 inches before the backlash was taken up. With the 1200 FD on the bench, could turn the pinion joint cup by hand and there was a noticeable click when the backlash was taken up. The 1500 FD was much tighter, gears meshed well.

If you are having the same issue, I'd look for a 1500 FD. Check out a trike conversion place, may be less expensive over there. I like Straightwings, but you'll pay a premium for a 1500 FD.

Another good aspect to this is that if the 1200 rear wheel does the turn the bearing trick, I already have the FD installed and only have to change out the tire, modify the caliper mount bracket, and put the 1500 rear wheel together.

Have more riding to do with the 1200, and will get back to you on the ride with the 1500 FD.


"When you write the story of your life, don't let anyone else hold the pen"

Ernest
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