What's the best clutch and springs available for this bike ?

I don't know of a problem with the stock clutch.
Its weakest link is that sintered metal throw out.

There aren't many options.

When the bike is cold and the oil is thick - the clutch can slip if full throttle is used.  Until the bike is warmed up....you should avoid full throttle.

The stock clutch works well and with my 95mm, Stage 1 cam, ported head and taller gearing it doesn't slip - but doesn't have a lot of reserve capacity.  (I never apply throttle between shifts until the clutch lever is released and the clutch is fully engaged).  The clutch is known to slip if anyone has ever used an oil with a friction modifier (car oil) as the moly or whatever they use impregnates the plates and causes them to slip - and if the clutch is even slightly out of adjustment it will slip.
(Maybe that expensive oil you use is just too slippery).

There are some companies that sell springs that are supposed to be 10% stiffer - as JOG said the sintered throw out is a weak leak and can break....some members just put a single washer under the springs to get a bit more pressure and were able to break the throw out.

I would suggest you take the clutch apart, clean it well, lightly sand it on a piece of 320 sandpaper glued/taped to a sheet of glass to remove the glaze, clean it again - then put it back together and try using Rotella oil and see if it makes any difference (it is a good oil for this big lawn mower engine).

There are also Kevlar clutch plates available....I don't know if they provide any additional grip over the stock plates.

Oldfeller has been threatening to sand the fiber plates thinner so he can stick an extra plate in.....nobody has tried that yet.    

It 's an older bike , you may want to check the clutch rod length , as the plates wear the rod can become to long, and the clutch not fully engage . I believe Vercy said that the rod should stick out less than 13mm from the face of the clutch, Suzuki factory offers them in three sizes at little cost.

batman wrote on 04/23/18 at 07:22:35:



I put a new one in with the the new motor build I am a big guy I am over 300 lbs.

At least throw out.
I don't see a problem with the basket

That just might be The Tikkit. That could solve the slipping problem without a spring pressure change, right?

You'll have a million hits on you tube.
Maybe even make enough to replace the broken parts and emergency room expenses.

If you could build a cylinder that the disks would stay in with the surface raised by the amount you wanted to remove, do all of them, raise the bottom, and do it again?
But they are So thin..
Maybe a coil from an automotive air conditioner to suck them down, and then you have a solid, square spinning holder.