StromTrooper banner

1 - 15 of 15 Posts

·
Registered
Joined
·
933 Posts
Discussion Starter #1
I rebuilt my K7 a few years ago and the F/R shocks were resprung for my weight at the time 220lbs (no gear). I have since discovered the Keto diet and have dropped +30lbs since Christmas and still falling. My target weight is 170-175lbs (currently at 188lbs). So with all that weight gone the bike doesn't handle well at all (handled great when I was heavier) and is over sprung for my weight. I really don't want to tear into it to replace the front springs and rear shock again nor do I want to get fat again so what can I do? I thought about adding some weight to the bike to make up the weight I lost but thought I'd ask if anyone has had to do that or has any other experience or advice to give. Is there an easy way to add weight to the bike? Where should I set preload?
 

·
Registered
Joined
·
933 Posts
Discussion Starter #3 (Edited)
The fork springs are easy to replace. The rear may be able to be adjusted a bit with preload?
I might be selling it next Spring (gonna get my red one!) so I was hoping to avoid the changing out the front springs and sell it as is. Its fine for anyone near 200lbs or higher. I was hoping that adding weight might get me through the current riding season okay. It is really getting uncomfortable (if not unsafe) to ride as it stiffly skitters over bumps. The other day I even got a slight steering wobble when I hit a bump at an odd angle. I don't know if that is related but it never did that before. I am going to back off the F/R preload and see if that helps as I haven't really messed with that since I refurbed the bike.
 

·
Registered
Joined
·
17 Posts
you lost the weight, so you got new clothes?
why not do the same for your bike?
 

·
Registered
Joined
·
933 Posts
Discussion Starter #5
you lost the weight, so you got new clothes?
why not do the same for your bike?
Good idea. That's why I am planning on selling it next Spring and get me a red one!
 
  • Like
Reactions: eagleeye

·
Registered
Joined
·
933 Posts
Discussion Starter #8
Isn't the front and rear preload adjustable?
The preload has no effect on the spring rate which is my problem, the springs are far too stiff for my new weight. As I understand it, and I am no suspension expert, the preload adjusts the sag, i.e. where the bike rides with the weight of the rider on board within the range of suspension movement. The preload allows you to adjust the sag if you add extra weight such as camping gear or a pillion, etc. to keep the suspension from bottoming out on bumps. Hopefully someone else can chime in and give a better explanation because I don't understand suspensions and they are complex. I already backed off the rear preload and will probably do the front soon but I don't know if that will have much of an impact. Today I went for a ride and it handled much better with a full tank of gas but got noticeably worse after my 90 mile ride as the tank was emptied.
 

·
Registered
Joined
·
7,437 Posts
Isn't the front and rear preload adjustable?
The preload just moves the position of the spring mounts up or down to get the bike in about the center of its suspension travel, as said, to minimize the chance of topping out or bottoming out. Even with dmf's back out all the way he may top out those springs.

I don't know what you can do except change springs. It's easy if you change one front at a time.
--take the weight off the front
--back the preload off all the way
--loosen the top triple tree clamp on one side
--remove the plug in the top of the fork tube
--remove the spacer
--fish out the spring
--insert the new spring and put everything back as it was originally.
 
  • Like
Reactions: Grimmer and dmfdmf

·
Premium Member
Joined
·
2,893 Posts
30-40 lbs really isn't enough difference to cause you do change spring rates. It's only 5% of the total bike/rider weight. Bike should still feel fine unless it was borderline too stiff before.
 

·
Registered
Joined
·
933 Posts
Discussion Starter #11
30-40 lbs really isn't enough difference to cause you do change spring rates. It's only 5% of the total bike/rider weight. Bike should still feel fine unless it was borderline too stiff before.
Probably marginal at 220lbs but it handled much better when I was heavier, no doubt about that. Previously I was at 220lbs in street clothes and just weighed my gear at 15lbs. Current weight at 188 + 15 would be 203lbs. During the refurb I replaced the DOA rear shock with a used Dougherty rebuilt DL1000 shock for 220lb rider (550lb/in spring) and he recommended 0.95Kg/mm front springs with 10wt fork oil (I don't recall the air gap) and it handled just fine (at least to me, I am no expert rider).

In any case, the problem is that it used to glide over freeway bumps and handle bumps in the twisties just fine. But now freeway bumps are jarring and in the twisties it kind of skitters over bumps without much compression of the springs which is why I thought it was the weight lost. Nothing else has changed on the bike but I did get a new rear tire (PR4) about 4000 miles ago and I was still fat back then and it handled fine even after the new tire.
 

·
Premium Member
Joined
·
2,893 Posts
Take some preload out of both ends and see it that helps.
 
  • Like
Reactions: dmfdmf

·
Registered
Joined
·
933 Posts
Discussion Starter #13
I already did the rear preload since turning the knob on the remote adjust is easy. I didn't notice much, if any, change. I'll do the front preload this week and test it out but I think its already out pretty far. Thanks!
 

·
Premium Member
Joined
·
841 Posts
One other thing you might try... When you were heavier there was more mass to dampen which tried to drive the hydraulics faster and likely the adjusters were set to restrict that flow a bit more. Now that you are lighter, the adjusters are having an increased affect against your diminished mass. If it is too jarring, try opening up the compression and perhaps the rebound adjusters a bit to soften and smooth it up. Of course, that assumes that the K7 has said adjusters...

I'm also no suspension expert, but I've recently been experimenting with dialing in the setup. On a recent long trip various passengers took turns riding with me. The more significant changes in weight seemed, to my inexperienced sensors, to affect the dampening and handling a bit. With the heavier passengers I had to restrict (stiffen) the adjusters, primarily noticeable as a bouncy rebound.

However, I could be completely off on my train of thought.

If there are no adjusters, then I would suspect that an update to your valve stacks would be in order? But those are even more difficult to swap out (at least the ones on the very bottom - again assuming some design characteristics of the K7) although probably not as expensive as the springs...

Otherwise, just move up your "sell" and acquire the "red one" date and let someone else worry about setting up the suspension to their liking.
 
1 - 15 of 15 Posts
Top