DECOMP IS A GOOD BRAKE
Posted September 01, 2000 - 06:48 AM
Posted September 01, 2000 - 12:00 PM
The obvious hole in this theory is that, along with eliminating the power stroke, you eliminate the compression stroke (unlike a Jake Brake) and therefore what you’d assume is the bulk of the braking force (with friction and rotational inertia making up the rest).
My highly unscientific tests of this theory and their results:
I tried rolling in gear down a slight grade (3rd gear, very low rpms) and compared these three trips:
1) In gear
2) In gear w/ release pulled
3) In gear w/ kill button pressed
According to my highly accurate butt, #2 wins the seat-of-the-pants stopping contest. You would think #3 would win if the Jake Brake theory is correct. But the difference was very slight. #2 wins only because the braking force was smoothed out instead of that 4 stroke “every-other” sensation. It actually reminded me a bit of my KX 500’s engine braking without the ugly green plastic. But the Jake Brake theory is really killed by a lack of any noticeable difference between #1 and #3.
Of course, I was pulling very low RPMs, and, despite Clarks prodigious experience I am leery of doing this to my bike. I don’t know how ATKs and XRs comp. release works, and what’s good for a Honda may indeed be bad for blue. Besides, I ride the dez, I don’t need brakes.
But I do use my comp. release to restart after stalls (if I’m still rolling) and will continue to do so, but perhaps more carefully. I sure have learned a lot of stuff on thumpertalk…
Posted September 01, 2000 - 01:36 PM
Posted September 07, 2000 - 03:03 PM
It is more work, but I think I would just modify the rear brake or learn to go easy on it. Obviously, a lot of things can happen when you open the comp release. Most of them are bad. When you have ridden Yamahas awhile, you will develop a soft right foot.
Originally posted by gbernard:
HAS ANY ONE TRYED USING THER DECOMP LEVER AS A ENGINE BRAKE. TRYED IT LAST WEEKEND AND IT SLOWS DOWN THE BIKE JUST LIKE APPLYING THE REAR BRAKE ONLY ITS MORE CONTROLABLE. A BUDDY WAS HAVING TROUBLE GONING DOWN STEEP HILLS,KEPT LOCKING UP THE REAR(KTM400). SO WE TRYED PULLING IN THE DECOMP LEVER AND IT
Posted September 07, 2000 - 03:58 PM