ENGINE BREAKING?

IS THE ENGINE BEAKING AFTER YOU LET THE TROTTLE OFF THAT BAD THE ONLY 4 STROKE I HAVE RIDDN WAS AN OLD XR200 WITCH DIDNT REALLY EVEN NOTICE THE SLOW DOWN. I KNOW THERE IS MORE ENGINE BREAKING THAN A 2 STROKE BUT I WANTE TO KNOW IF SOME ONE COULD MAYBE TRY TO EXPLAIN HOW MUCH MORE.:)

The engine breaking is really noticeable with the 426, but the engine braking allows you to do big down hill sweepers and downhills without even touching the brakes, which allows you to carry more speed than a two-smoker in the end.

It is kinda like lightin up a 69'mach one with a 428 cobra jet and lettin off of the throttle at 5000rpm. The thing is probly gunna' slam you thru the windshield!

If you do the same thing in a Geo Metro.............

Well, you get the idea!

My friend and I both have 01 YZ426s. He put a WB R4 muffler on, with the stock headpipe (for the S/A option). His bike runs very different, no worse, just different-even jetting, we ended up putting in a 45 pilot on his. Idle speed is the same. But his does not seem to have anywhere near as much engine braking as mine. Feels like a two stroke. Strange. Has anyone elso noticed this with aftermarket exhausts?

Portions of your engine breaking is caused by the exhaust back pressure. The more back pressure a engine has the more restrictive the intake system is in allowing air/fuel into the motor. With the Aftermarket system they flow more gasses through the system compared to the stock system. This allows the motor to breathe more and reduces the engine breaking. Also if your buddy has a flywheel weight that will reduce the initial amount of engine breaking.

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Scott #410

Some Fear Racing "Cause if you don't have any you ain't going fast enough"

'99 YZ400F(Coming to a Theater near you soon)

'92 ZX-7R and '97 ZX-7RR

"Doesn't hurt till the bone is exposed"

"When cut do you bleed green? I do!"

Pics

If your buddy is running an exhaust which causes his bike to run leaner with the engine spinning quickly and the throttle closed (or if he just has leaner low-speed jetting) or his idle is set higher then these can contribute to less engine brakeing.

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