2nd gear, low rpm flameout, sandy corner exit.

2009 yz450f

Temp 48-53f

Saturday elevation 200ft, Sunday elevation 850ft.

Completely stock jetting.

Idle turned down 1/2 a turn from stock due to Rekluse.

Sandy, 2nd gear corner exit, 33%-50% throttle opening.

Powerbomb header(stock was replaced due to damage), stock silencer.

Happened a bakers dozen times last Saturday and Sunday. And was frustraiting. Air filter and boot were squeaky clean. Freeplay gain was set correctly at 1/8 inch with Rekluse EXP 2.0. As my skills and confidence increased in sand this season, is this a business as usual 4 stroke issue as I was asking too much with a quick throttle opening? Or is it another concern?

Thanks :busted:

If the bike flames out as the throttle is applied after chugging a time or two, it could be that the engagement rate (as opposed to the engagement speed) is set at the high rate, and that this is too aggressive for low speed pulls in second gear. This was the case with my '06 and the Z-Start Pro clutch. I started with it set at the recommended medium engagement speed/fast engagement rate, and couldn't do a second gear launch with it without using the lever. Changing to the slow rate cured it.

The rate in a Rekluse is usually set by varying the weight of the wedges or balls, depending on which clutch you have.

The EXP 2.0 has the wedge system. I'll have a look at my instructions that came with it and look on their site for different wedges. Thanks Grey.

2009 yz450f

Temp 48-53f

Saturday elevation 200ft, Sunday elevation 850ft.

Completely stock jetting.

Idle turned down 1/2 a turn from stock due to Rekluse.

Sandy, 2nd gear corner exit, 33%-50% throttle opening.

Powerbomb header(stock was replaced due to damage), stock silencer.

Happened a bakers dozen times last Saturday and Sunday. And was frustraiting. Air filter and boot were squeaky clean. Freeplay gain was set correctly at 1/8 inch with Rekluse EXP 2.0. As my skills and confidence increased in sand this season, is this a business as usual 4 stroke issue as I was asking too much with a quick throttle opening? Or is it another concern?

Thanks :thumbsup:

So...did you get this figured out? I am having the exact same problem (had it for a while) with only a couple different variables:

2009 yz450f

Warmer temps(70's-90's)

Rekluse Core EXP (not 2.0)

Elevation 200-1200 ft

Completely stock jetting.

Idle turned down 1/2 a turn from stock due to Rekluse.

Sandy, 2nd gear corner exit, 33%-50% throttle opening. ALSO in tight trails, it will do it too when I am creeping or idling a bit and then crank on the throttle. After I stall it in the sandy corner, it usually seems flooded and is HARD to start.

FMF 4.1 slip-on

Don't really remember these problems before the rekluse but I didn't ride it much before I put in the rekluse. Jetting or Rekluse adjustments needed? thoughts? Thamks for any help.

So...did you get this figured out? I am having the exact same problem (had it for a while) with only a couple different variables:

2009 yz450f

Warmer temps(70's-90's)

Rekluse Core EXP (not 2.0)

Elevation 200-1200 ft

Completely stock jetting.

Idle turned down 1/2 a turn from stock due to Rekluse.

Sandy, 2nd gear corner exit, 33%-50% throttle opening. ALSO in tight trails, it will do it too when I am creeping or idling a bit and then crank on the throttle. After I stall it in the sandy corner, it usually seems flooded and is HARD to start.

FMF 4.1 slip-on

Don't really remember these problems before the rekluse but I didn't ride it much before I put in the rekluse. Jetting or Rekluse adjustments needed? thoughts? Thamks for any help.

How come you guys have turned the idle down?....in my Rekluse instructions it recommends turning the idle up higher than stock.....i have a Z Start Pro

Edited by 08kxf250

If the idle is not turned down, the rekluse core exp will not completely disengage. I am no expert but everything else was adjusted correctly and it works great as long as the idle is not set too high. I had to turn mine down lower than I had it pre-rekluse....and now that I think about it more... I did have some slight flameout problems pre-Rekluse and just turned the idle up to compensate and it seemed to fix the problem...SO I guess I should start with Jetting.

Instead of turning the idle down, raise the engagement RPM of the clutch. Then be certain that your pilot circuit isn't set up rich.

Gray, thanks for pointing me in the right direction. I wasn't aware that I could adjust the engagement...but thanks to you and referencing my Rekluse manual I see how. I will be doing that soon. :thumbsup: Then I will dial in the jetting too.

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