Adventure Bike Rider Forum

boboneleg wrote:I just done a little wee :laugh: :laugh: :laugh:

boboneleg wrote:

minkyhead wrote: anyway you have no need to worry as there wont be any replies to your posts by me as i have switched on the total bellend button so you will be ignored

I just done a little wee :laugh: :laugh: :laugh:

minkyhead wrote:dont bother .. head for the nearest mirror robbo ..at least i dont have to reregister on forums under a different name :whistle: ..i wonder why you feel you need to do that ?
anyway you have no need to worry as there wont be any replies to your posts by me as i have switched on the total bellend button so you will be ignored

robson wrote: and you just showed you don't know what are you talking about, progressive suspension is way batter is such situations (changing load, changing conditions, terrain etc) and more adventure bikes move toward it now but you don't know that

motorbike wrote:hi..probably been asked before ..but ..if a full yoshimura system is fitted new to a new crf250l..as advertised by a dealer currently...assuming no airbox mod done...does it require a (efk ) ? electronic thingmy mixture adjuster ? to be fitted or will the bike be prone running lean

cowling wrote:

minkyhead wrote:dont bother .. head for the nearest mirror robbo ..at least i dont have to reregister on forums under a different name :whistle: ..i wonder why you feel you need to do that ?
anyway you have no need to worry as there wont be any replies to your posts by me as i have switched on the total bellend button so you will be ignored

Quality, :laugh: I never knew a hyperpro spring question would stir up so much interest, thanks for the advice Steve, much appreciated, I've ordered now so I'll give it a try.

Arthur Pint Motor wrote:

robson wrote: and you just showed you don't know what are you talking about, progressive suspension is way batter is such situations (changing load, changing conditions, terrain etc) and more adventure bikes move toward it now but you don't know that

Progressive suspension is achieved by the linkage system with a linear spring. Linear spring rates are easier to get the damping right. It took KTM many years to get their non-linkage PDS system to work well, they started off with progressive springs but eventually went back to linear springs and used progressive damping.

Adding a progressive (rising rate) spring with a linakge system will increase the ramp up and probably make the damping even harder to get right, judging from the KTM story.

No good in dirt bikes!

Dirt bikes have adequate progression built into the suspension linkage systems or into the shock system such as KTM PDS shocks. These systems are designed to work best with the correct linear springs for your weight. The same holds true for dirt bike forks due to the air spring compression.

A progressive spring in this case is an overkill and makes the suspension too stiff deeper in the stroke. Dirt bikes are always ridden solo, and your weight and the weight of the bike remain constant (for some riders more than for others . This means that once you have the correct linear spring rates the bike should always work perfectly from ride to ride.

Big advantage in dual sport bikes!

Adventure bikes differ greatly from dirt bikes. One day you ride solo, the next you lift a passenger. You add bags, lots of extra gas or extra gas tanks etc. In other words there can be big weight variables from one ride to the next. Theoretically you need one set of shock and fork springs for solo riding and another for riding with a passenger or laden bike. You would have to change springs each time you load up or lift.

Obviously it helps to balance the bike in these situations by adding and removing preload but this is only a quick fix. The problem with a quick fix is that the soft springs still remain too soft for lifting or loading. You will still experience handling problems.

On long trips this is bad as it puts great strain on chassis and suspension and reduces long term reliability. Therefore the progressive version is a great help and can offer the best of both worlds.

The progressive spring functions in such a way that the beginning third of the suspension travel remains soft and offers a comfortable ride acceptable for solo riding. Thereafter some of the spring coils start to close up and become inactive. They create a substantially harder spring for the last two thirds of the suspension travel. This is very good for hard solo riding and for situations where you load the bike or carry a passenger.

It’s almost like cheating and having two springs in one on your motorbike!

motorbike wrote:hi..probably been asked before ..but ..if a full yoshimura system is fitted new to a new crf250l..as advertised by a dealer currently...assuming no airbox mod done...does it require a (efk ) ? electronic thingmy mixture adjuster ? to be fitted or will the bike be prone running lean