what does this mean?!

[MagicJames]

When running an engine at full throttle for extended periods be sure to chop the throttle decisively to slow down, just rolling out a little can seize a well jetted engine.

I was reading motor break in over at CT racing, and this confuses me... :wondering :confused: :wondering

[ATC-Eric]

With a 2 stroke, you dont want to run it at full throttle for extended periods of time. The fuel can not keep up with the air flow, and it will create a lean condition.

You want to "chop" the throttle, so that the engine still receives fuel/oil. When you just let off the throttle the carb slid closes, you are relying on the pilot jet to feed the bearings and everything with oil. So you chop it to keep fuel/oil moving.

[MagicJames]

So you just drop the throttle for a second and then back on the gas?

[chrisand4]

You do not want to run at full throttle for extended periods of time anyway, what it is saying is when you slow down, if you let the slide drop all at once you are shutting off flow completely, blip the throttle a little so you are still getting some fuel/air flow while slowing down(for jetting/lubrication).

Edit:
They are only speaking of slowing down (that's my theory anyway). I know a 2 stoke is capable of running full throttle for extended periods, but if you're an average Joe it might not be so good for the longevity of the machine. I've herd cases from Bob down the road grenading his engine from 2 miles of WoT on his RM out on the country road...of course "Bob" never was one for proper jetting/maintenance anyway :lol:

[ATC-Eric]

Thats another reason why you shouldn't engine brake with a smoker. Pull the clutch, and use the brakes.

When you let off a high rev, just pull the clutch, and bump the throttle here and there to keep the fuel moving. Thats why you always here those annoying 2 strokers bumping the throttle all the time. Its not to look cool.

Dropping the throttle then back on the gas:

Just think of it like this. If the motor is still turning at a high rate of speed, and the throttle is closed (main jet is closed), there is no fuel/oil being supplied. So when you let off, "bump" it. The pilot jet is designed to provide enough oil/fuel at an idle, not at high rpm's.

[85Tecate]

From my understandings 2 strokes are the ONLY engine you want to run wide open......

Boats do it all day long with no problems whatsoever. Why cant we?? I run mine wide open for extended periods and my cylinder still has the hone marks in it. Piston is as clean as it was when installed and no scratches/scuffs anywhere. I run @ 40:1. I'd say people still associate 2 strokes and engine failures way too much.

[Dammit!]

You can run a 2-stroke wide open under the right conditions. There has to be a sufficient load on the engine and it has to be jetted right. For example, you wouldn't hold a 250r wide open in neutral but you can safely hold it wide open in fourth gear going up a dune for a pretty good length of time without hurting anything.

[Maico]

As long as it's jetted properly...you can hold it wide open in top gear all day long. Desert racers have been doing it like that for decades

[beets442]

+1 Maico... Example: Baja 1000:cool:

[lndy650]

thats not what this means... what they mean is to slow down let off the throttle and pull in the clutch. slowing down while letting off the throttle slowly can lean out the engine. just think about it.... if your doing 75 at 8000rpms and you let off coasting to a stop your engine is slowly reving down from 8000 rpms with only the pilot jet to supply fuel/air.

i think thats what they mean.....