Finished up this short work period today and have done a road test. The story:
Finished up the shock install, and oil/filter change.
Left the engine to drain overnight. Took out the engine drain plug to check the o-rings and was not expecting more oil in the engine sump - wrong, still oil in the sump. Note to self and others - to get as much oil out of the engine need to remove the engine side drain plug. The lower o-ring on the drain plug was torn so needed new one. Replaced the crush/sealing washer, and both o-rings. Will be putting the used oil into containers tomorrow. Will be interesting to see how much oil came out. Used Lucas full synthetic 10W40.
Took the rear shock off, lower bolt was easy, upper bolt required some finesse. Had a 15 mm crow foot wrench on the nut that is located in behind the air compressor. Had Sonya assist, and left the nut up against the shock mount for later install. Wouldn't want to take the nut out and try to put it back in later. Didn't hurt to leave it there for the duration.
The rear M2 shock is longer than the OEM by about 1.125 inches. Makes a difference sometimes. I also installed the 700 lb/in spring. The 525 lb/in rear spring is 6" unloaded length, the 700 lb/in rear spring is 6 7/8 inch unloaded length.
Free travel - Spyder in air no preload 9.5 inches. Percentages: 25% = 2.375"/30% = 2.85"/35% = 3.325 Right now I'm using approximately 2.25" or approximately 24% of rear suspension travel. I can theoretically use up to 3.325" when two up riding. Will have someone take a measurement of the two of us on the Spyder. Be interesting to see what it is.
After rear shock install, did some measurements for centre of rear wheel axle to the left saddlebag. Full travel no preload 9.5 inches. Spyder on ground no rider no preload 8 inches. Spyder + rider + 24 lb no preload 7.25 inches. Used just over 25% of shock travel for ride height. Rear shock was set at 20 clicks for rebound damping, has about 40 clicks - lots of adjustment. Minimal preload used, almost none.
Adjusted the front shocks for preload and rebound damping. These shocks have some 60 clicks for adjustment. Set on 31 clicks both sides and the shock compresses and returns to set height with no overshoot. Set the front height with preload adjuster(s). Have the spring compressed to 18.5 cm. Thinking of reducing this to 18.25 cm then road test - scraping is not your friend.
Spyder back together and time for road test. Set the ACS at lowest/softest setting. Was aware of some people having ACS trouble codes after a shock or suspension tuning/upgrade. Was conscious of this for the entire test ride. No trouble codes.
Noticed right off that the ride was a lot firmer. The rear of the Spyder did not settle when starting off necessitating the air compressor to compensate, or when shifting at a higher RPM. The front end did not dive as it did with the OEM shocks. The front end would dive even on a gradual sweeper, and it could be seen. With the new M2 front shocks, I had to watch closely to see if the front suspension was compressing, but was hard pressed to see the A-frames compressing. There was front suspension movement as I could feel the centrifugal force in a corner/turn, but it has now been minimized significantly. Thought I might need to upgrade the front shock springs to a stiffer spring rate, but maybe not.
Took the same route that I did when I had the new tires installed. Lots of twisties, roundabouts, and turning at corners. Significant improvement in the ride and handling. The handlebars "feel" more centred. Did the same alignment test on the same section of the ride. 70 KPH, let hands off the bars and the Spyder tracked quite straight. Did fall off after a bit, but the road will do this, did not feel like it was a Spyder issue.
Returned home and scraped the front, first time it has done this. Might have to increase the front preload to raise the front end a bit more.
Mentioned I had set the ACS on the lowest setting. The air system had been purged of all air before rear shock removal/install. On return home, checked the air system pressure and there was none. I think the system is trying to work, but the new rear shock is longer and the spring sufficiently stiffer that there is no need for the air system to adjust to compensate for ride height. The 700 lb/in spring is more than sufficient to carry the weight of the Spyder and myself - didn't take the extra 24 lbs I used for shock travel heights. If this works out well two up, will be considering disabling the ACS system. Better to have the main shock do the work and be sized properly. Will check the amount of air in the air system after the first two up ride. I'm thinking it may be negligible.
The rebound damping on the shocks was spot on, but being such, the ride can be too firm. Have adjusted the front shocks so that there is a small overshoot on rebound, but shock settles with one small overshoot. Softened up the rear as well. More trials to do.
Picked the shocks up yesterday afternoon and started on the install. Marcus called to follow up. We had a short discussion and I mentioned I would get back to him. Called him a short while later to get a quick insight into the rebound damping settings. Marcus phoned again today asking about my progress. Mentioned I was working on the rear shock and would get back to him. He asked for pictures, have take a few - will post when I get a moment. Going to provide him with my thoughts on the M2 shock performance. I got the impression he has not done an M2 shock install on an RT LE.
I had to take a round file to the front shock mounting bushings to have the OEM bolt fit - small inconvenience, but one that should be noted.
Instructions that came with the shocks are quite good.
Have pics and will post when I get them annotated and such.
Cheers