Compression braking effects - how to decrease/increase?

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11/17/2018 1:28 PM

Is the engines primary compression ratio the only variable determining the amount of rear wheel compression braking in each gear? If a bike has too much braking effect, what can be done to reduce it? Rekluse clutch help? Which current 450's have less compared to other brands? I ask because ilike less of the braking effect on sand tracks vs hardpack. Thanks...

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11/17/2018 1:38 PM

I have a rekluse zstart pro auto clutch in my 450 and there is no engine braking. Id imagine you can adjust the amount by feathering the clutch...

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11/17/2018 1:46 PM

slipper clutch

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11/17/2018 1:54 PM

Go up a gear for less and down a gear for more....

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11/17/2018 3:49 PM

2019 COMPRESSION ratios
CRF450 13.5:1
YZF450 12.8
KTM/HUS 12.75
KX 12.5
RMZ 12.5

One shootout (Keefer?) said the Honda had the least engine braking? Is it something to do with connecting rod length or stroke that gives the Honda less engine braking?

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11/17/2018 3:54 PM


Remember these?

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2015 Beta 500 RS, history: 99 KTM 300, 87 CR250, 84 KLR 600, 82 GPZ 550, 81 KX 250, 80 KX 250, 79 Montesa 414 VE, 78 250 VB, 77 360 VB, 76 360 VA, 75 YZ 125, 74 TM 125, 72 TS 125, 60's West Bend Go Boy Kart

11/17/2018 3:57 PM
Edited Date/Time: 11/17/2018 3:59 PM

The running compression ratio is different than the theoretical compression ratio.
Also things like spark advance, fuel mixture, rear suspension design, and gear ratio will affect engine braking.

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11/17/2018 4:06 PM

If you dial up your idle you will have less compression braking. Mapping for FI can accomplish this.

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2015 Beta 500 RS, history: 99 KTM 300, 87 CR250, 84 KLR 600, 82 GPZ 550, 81 KX 250, 80 KX 250, 79 Montesa 414 VE, 78 250 VB, 77 360 VB, 76 360 VA, 75 YZ 125, 74 TM 125, 72 TS 125, 60's West Bend Go Boy Kart

11/17/2018 7:09 PM

Use the compression braking modulating lever. Comes free on most bikes.

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11/17/2018 8:11 PM

Less compression braking - ride a 2stroke
more compression braking - ride a 4 stroke

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There are two kinds of people against dirt bikes, those who never tried and those who weren't good at them.

11/17/2018 9:36 PM

Buy a yz250

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11/18/2018 12:46 AM

Engine braking can be adjusted with mapping these days. I’ve ridden some very impressive maps from Twisted Development that completely changed my suspension charactistics because how it frees up the tension in the chassis. It’s very interesting!

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11/18/2018 3:54 AM
Edited Date/Time: 11/18/2018 3:55 AM

Alterinf ignition timing off throttle is largely effective at higher rpms in the map


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