How To Lighten Your Clutch | Easy mod with shim washers

Here is how I lightened my clutch pull on a Wr450f 2021.
Stock lever/cable and clutch.
This will work on most 4 and 6 spring type clutches found on the majority of dirt bikes.
The ratio may vary from bike to bike, for example
the WR450f worked out around 10% lighter per 1mm shim washer
approx. 20% for two and so on.
Other brands and models may have softer or harder clutch springs and as such you may need more or less in shim washers, possibly some in 0.5mm increments to get your ideal feel.
A bit of experimenting may be required....
It is how ever a cheap and fairly easy way to lighten your clutch, along with having a good cable and free operating lever if mechanical of course.
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Moto Scotia
#endurolife
#wr450f
#clutch
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[@6Twisted]

Does this not cause clutch slip?

[@freedombehindbars]

Hi Bud, No it doesn't in my experience on the 450, it would eventually at some point but a few 1mm washers won't be enough to cause it to slip. I would say the 250's probably have lighter springs to start with and from feedback on wr uk forum, 1x1mm seems to be ideal for them. I use 2x1mm on the 450 for approx 20% lighter... that will probably feel similar to 1 washer on the 250's.

[@6Twisted]

It's going well so far. I forgot to disconnect the battery and almost bump started the bike taking the clutch springs out. Then I dropped a washer into the clutch basket but eventually managed to fish it out with a magnet. Then I snapped a bolt because my old torque wrench is out of spec. 🥲

[@freedombehindbars]

😯 having no luck by the sounds of it ... Upside is once done you'll have a lovely light clutch that will easily make up for the inconvenience 😁

[@6Twisted]

@@freedombehindbars What map are you running yours in though? I have a max advanced timing map that is quite a bit more powerful than stock. I'm starting with 1.5mm washers.

[@freedombehindbars]

@@6Twisted stock maps as the difference between them is deal for me. Adjusting the mapping has minimal change to power output, (the increments are are fine and range is small- just how it delivers will feel different.) You could fit an exhaust/ power filter kit and map to suit, gaining 5-7 hp as per yz450f Vs Wr. The clutch will have been designed such that it can handle that and more.

[@6Twisted]

@@freedombehindbars Oh there's a huge difference between fully advanced and retarded timing. Fully advanced it power wheelies in 5th, fully retarded and it will barely clutch up in 4th. Anyway I just went and tested with 1.5mm washers. Popped the clutch in 5th with the throttle wide open and no slip with fully advanced timing.