Full Throttle Stop Screw

[Otdrzman]

1B862844 - 2012 250 Pro XS

The service manual (8M0122849) states that this distance should be set to .010. I know mine is larger than that. I haven't measured but I'm guessing mine is around .050. How important is it for it to be on the money at .010? TPS position/voltage issue? I just want to be sure that I'm calling for full engine speed when running WOT. This picture was taken from the FAQ - Hot Foot setup. Thanks.
IMG_1582.jpeg

[EuropeanAM]

.020" is fine. If you're above that, follow the directions in the post.

[Otdrzman]

Thank you

[chad202]

SN 2B533867

i decided to look at mine. I already had someone hook up to motor with DDT and it showed I’m getting max 100% on TPS BUT with throttle cable disconnect and using throttle arm to
achieve full throttle, my gap on the strike plate is .075. Does this mean I CAN adjust the full throttle
screw behind the VST since I’m getting 100% on TPS?

[EuropeanAM]

Yes, you could adjust the stop screw to match the .020 clearance noted in the instructions there in the FAQ section.

TPS reading 100% on this engine doesn't necessarily match the AIR side (throttle plate). While that's only a small variance, any time you provide 100% of the fuel and .998% of the air, you're rich.

[chad202]

Thanks Don. I saw where it said .001-.020 so I adjusted it to .011.

[EuropeanAM]

Chat will be fine. Main thing is we don't want it loaded against the stop.

[Otdrzman]

Mine was .040 prior to adjustment and Diacom was showing the Throttle Percent at 100%. I adjusted it to .015 and it brought the TPS voltage for WOT (4.0 - 4.7) up from 4.08 to 4.16. After reconnecting the throttle cable I checked my hotfoot and had to make a minor adjustment on the WOT stop bolt and also add a little more spring tension so the hot foot would return more firmly against its idle stop bolt.

[chad202]

Mine was .040 prior to adjustment and Diacom was showing the Throttle Percent at 100%. I adjusted it to .015 and it brought the TPS voltage for WOT (4.0 - 4.7) up from 4.08 to 4.16. After reconnecting the throttle cable I checked my hotfoot and had to make a minor adjustment on the WOT stop bolt and also add a little more spring tension so the hot foot would return more firmly against its idle stop bolt.

what if anything did you gain?

[Otdrzman]

what if anything did you gain?

I just made the adjustment today so I haven't ran it on the lake yet. I did run it in a water tank just to check some other items. I don't expect to notice anything honestly. I noticed the gap the other day and wanted to adjust it to bring it back closer to spec. As Don mentioned in reply #5, calling for 100% fuel and not giving it 100% air makes sense to me. Probably wont notice anything but it cant hurt to get it closer to spec.

[chad202]

I just made the adjustment today so I haven't ran it on the lake yet. I did run it in a water tank just to check some other items. I don't expect to notice anything honestly. I noticed the gap the other day and wanted to adjust it to bring it back closer to spec. As Don mentioned in reply #5, calling for 100% fuel and not giving it 100% air makes sense to me. Probably wont notice anything but it cant hurt to get it closer to spec.

Gotcha. With mine being .075 and you can see noticeably that the butterfly was about 10deg off center, I’m hoping to gain 1-200 RPMs.

[Otdrzman]

Gotcha. With mine being .075 and you can see noticeably that the butterfly was about 10deg off center, I’m hoping to gain 1-200 RPMs.

I suppose its possible. Report back when you run it. You got my curiosity up with yours being that far out of adjustment.

[chad202]

Will do.

[EuropeanAM]

MAYBE 50-75 RPM's. Best to have it right, regardless.

[chad202]

Well ran it this morning. No change. Actually it almost felt slower but it is muggy and 78degrees. I assume it’s not possible to do this and it slow down? Very disappointing. Thought I was into something.

[EuropeanAM]

Very unlikely- much more likely the atmospheric conditions are involved, assuming that you've achieved WOT position properly.

[FeFanatic]

So, what rpms are you achieving at wot?

[chad202]

23 Fury-6150
24 Fury-5950
25 Fury-5750
All props basically run the same speed. 72.5-74.5 depending on load and weather.

[bass.man65]

So you run the 24 and leave it alone it is what it is. You want faster you will need real HP

[chad202]

So you run the 24 and leave it alone it is what it is. You want faster you will need real HP

That’s the plan. Just wanted to make sure everything is setup correctly and getting the most from my setup.