2-Stroke Compression Braking... Problems?

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LocoCD

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Mar 22, 2000

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• Feb 22, 2002

• #1

My son just began riding a 2-stroke. Quick question, he is used to riding a 4-Stroke and using the compression braking to his advantage. If he does the same with the 2-Stroke (and I am aware that 2-Strokes have less impact, but he still has the habit on long downhills) will this have adverse affects on the engine? Does there need to be more fuel flowing for lubrication?

Any thoughts would be appreciated.

 

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morph

Member

Dec 7, 2001

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• Feb 23, 2002

• #2

your son may want to change his habbits when riding a two stroke.
As you know when using premix fuel, the engine lubricating oil is in the fuel so i'd avoid using the little engine braking they have or high RPM throttle chops as when the throttle is closed not only does the carb limit the fuel/air mix it limits the engines lubrication.so going flat out and rolling off the throttle in gear coasting to a stop and no throttle in a low gear making your way down a hill is destroying the engine.you could try richening up the pilot heaps while he's learning though.
hope this helps ..

 

Jaybird

Apprentice Goon

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Mar 16, 2001

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Charlestown, IN

• Feb 23, 2002

• #3

morph is spot-on about the lubrication. Also, using compression braking on a 2-stroke can mean wheel lock and mucho trouble. Help him to forget about doing this. His clutch and brakes are his friends.

 

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dell30rb

Uhhh...

Dec 2, 2001

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• Feb 23, 2002

• #4

I had the same problem when i switched...on the xr 80 i would just put it in second for the downhill and not worry about using the brake...just learn to use the back brake

 

Z

zsr

Member

Mar 17, 2001

90

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• Feb 23, 2002

• #5

Originally posted by Jaybird
Also, using compression braking on a 2-stroke can mean wheel lock and mucho trouble.

Click to expand...

Huh? You mean from engine seizure I assume?

 

fremontguy

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Jul 1, 2000

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• Feb 23, 2002

• #6

Zsr, I think he meant stalling engine in gear=no bueno, rear wheel locks up. I try and switch between clutch and no clutch on big downhills. Does a fast idle help with the lubrication?

 

Jaybird

Apprentice Goon

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Charlestown, IN

• Feb 24, 2002

• #7

Yes, engine stalling is what I was talking about. Not a good thing.
Also, dell30rb...one wants to also be careful with the back brake on a 125, it will cause "engine stall" as well. The front is a much better choice for braking. I like to initially use the Front/rear for hard stops but then feather out the rear with the rest of my braking using the front. Depending on the turn, I may keep feathering the front to keep the wheel tracked.
I like to just pull the clutch in a rev a few times down a hill, but I'm not much of a woods man. I would think a high idle would be ok.

 

wardy

2005 Lori Nyland Award Winner

Nov 12, 1999

2,681

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• Feb 24, 2002

• #8

are we

talking on a moto track or trail riding?

 

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LocoCD

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Mar 22, 2000

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• Feb 24, 2002

• Thread starter
• #9

Trail riding and Hare Scrambles. We also run into long hill climbs in the area with subsequent long downhills.