flapper valve - wire it or tack weld it

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Slow said:
Servo closes, spring holds it open. So I would think the spring is strong enough to hold it open or it would close at high rpm even with the servo. I wired mine open anyways just in case.
Click to expand...

that is the problem though, the spring is NOT strong enough to hold it open at high rpm. Hence the disconnect and lock wire solution.
 
Manufacturer problem then. Means that stock bikes could possible have valves closing at high rpm's. Factory defect?
Thanks for the info.
 
safety wired AND welded together. I won't be getting around to removing the flapper until riding season's over, so this will hold it until then.
 

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90Swampfox said:
Manufacturer problem then. Means that stock bikes could possible have valves closing at high rpm's. Factory defect?
Thanks for the info.
Click to expand...

if the servo motor is active, it will hold the valve at whatever position the ECU tells it to. So stock bikes with fully active servo systems do not have valve closure problems.

It's easy to tell if the valve is closing - at WOT the engine hits a safety limiter at around 10,000rpm.
 
Well, it only has 1 cable and you can shut it with the cable on the valve. I tried. So, the motor can not hold it open, it relies on the spring tension.
 
Slow said:
Well, it only has 1 cable and you can shut it with the cable on the valve. I tried. So, the motor can not hold it open, it relies on the spring tension.
Click to expand...

safety wire it open then. Takes literally two minutes. If you're truly paranoid, add the tack weld like I did.

ah....I see the issue. With stock cans, you'll never get the exhaust gas velocity to push the valve closed. The Termignonis I have are straight through, so with a Sprint air filter, gas flow is higher and starts to close the valve at 10k rpm.
 
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kismetcapitan said:
safety wire it open then. Takes literally two minutes. If you're truly paranoid, add the tack weld like I did.

ah....I see the issue. With stock cans, you'll never get the exhaust gas velocity to push the valve closed. The Termignonis I have are straight through, so with a Sprint air filter, gas flow is higher and starts to close the valve at 10k rpm.
Click to expand...

Already did. Was just saying what I found when putting on slip on's.
 
chillo said:
With the cable and servo in place on mine I can still move the valve fairly easily, the servo does not hold the valve open.
Click to expand...

I'd have to dig mine out of the basement, but IIRC it was very difficult on mine to turn the servo by hand.

Either way, Akropovic Evolution fixes all of this...
 
Perhaps some individual isolated cases of a weak spring. For 3 years now guys on here have been disconnecting the cable and no one has ever had a problem from what I have read.

I do not doubt what people are saying in their posts. But I do not think it is a design fault.

I have had my bike at max revs at the track and never noticed any hicupp. When I did my base dyno run before fitting the akra system, it worked fine with no wire holding the spring open.
 
it might be a batch of weak springs + the increased gas flow in the 1299 pipes due to more displacement. My tuner has done a bunch of 1199s and uses a system where a small hole is drilled into each header pipe, then a hose runs to the wideband sensors. But even at full suction, the gas flow was creating a reverse vacuum, causing the sensors to read incorrectly.
 
kismetcapitan said:
it might be a batch of weak springs + the increased gas flow in the 1299 pipes due to more displacement. My tuner has done a bunch of 1199s and uses a system where a small hole is drilled into each header pipe, then a hose runs to the wideband sensors. But even at full suction, the gas flow was creating a reverse vacuum, causing the sensors to read incorrectly.
Click to expand...

That sounds like a hack job to me. Drilling holes in the header pipes. Why not just put the WB sensors in the holes that are already there for the O2 sensors. That how Wayne Mc Tuneboy did mine.

Drilling holes in the headers and then the sensors read incorrectly. Not much of a solution.

At the end of the day not an issue if you replace your exhaust system with a full system that gets rid of all that crap.
 
bradp51 said:
That sounds like a hack job to me. Drilling holes in the header pipes. Why not just put the WB sensors in the holes that are already there for the O2 sensors. That how Wayne Mc Tuneboy did mine.

Drilling holes in the headers and then the sensors read incorrectly. Not much of a solution.

At the end of the day not an issue if you replace your exhaust system with a full system that gets rid of all that crap.
Click to expand...

I had 18mm bungs welded in to use when tuning. It'll be a grand day when 12mm wideband sensors become widely available.

when installing the 12mm to 18mm adapters required to use the stock O2 sensor ports, didn't the pipe have to be removed or some other shenanigans in order to fit that bulky thing?
 
I know it's a slight divergence, but the Akrapovic full system I saw recently was setup for 18mm sensors. There was an included 12mm thread in adapter, and block-off bolts that were safety wired in place. Came that way out of the box.
 
kismetcapitan said:
With stock cans, you'll never get the exhaust gas velocity to push the valve closed.
Click to expand...

I'm afraid that is incorrect, I have standard cans and I've had to lock wire mine open and after it was closing under wot above 9k.
The difference is amazing, bike revs out in top now:D I could do with another gear or 2! The bike is nuts now! I ....... love it! :cool:

Everyone with a 1299 should disconnect the valve servo and lock wire it open.
 

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