Hyper 821 won't rev over 7.5k

mikejuice · Apr 30, 2019

Hey everyone,

I hoping you guys might be able to help me out. I have a 2013 hyper which I recently did some upgrades to including, Rapidbike Evo + qs, MWR filters + power up (added filter), removed flapper valve, and a SC projects oval slip-on. Note all done at once. I've uploaded Kuksul08 map and seems to be running way better than autotune. However the bike will not rev past 7.5 in neutral and will not go above 7K under load. Also even up to 7k it feels like a lack of power like it's in some type of limp mode. I didn't have this problem before installing these parts. From the research I've done I heard it could be a bad neutral switch or micro clutch switch. I've tried by passing the micro clutch switch both unplugging and connecting the wires together. i also inspect the wiring going to the neutral sensor that seemed to be okay. I'm lost on what to do next. Is there a way to bypass the entire neutral sensor, test it or am I completely going in the wrong direction. Any help would be greatly appreciated.

Best regards
Mike

gatdammit · Apr 30, 2019

I'd probably start with the RB wiring. You can run some stout diagnostics with the free software from Dimsport. If you rule electrical out, I had an issue where I pinched my fuel line putting the tank back on and it was very hard to diagnose - severe loss of power above 1/4 throttle.

Good luck.

mikejuice · Apr 30, 2019

Thanks, I definitely checked for the fuel line pinch a few week back after reading that post. I might dig back into the wiring again to see if that the issue.

N4teTheGreat · Apr 30, 2019

Edit: Ah never mind suggested the clutch switch but saw you already checked that.

mikejuice · Apr 30, 2019

I just realized I had the wrong wire jumped since I did this months back. I found and un-jumped the mirco clutch switch and definitely seems to run better and rev quicket. I'm still not getting much past 8k on wide open throttle under load. Should it be getting to 10k? I've forgotten how stock feels after not riding it so long.

bayotte · Apr 30, 2019

Should get to 10k without issue, assuming the bike is in gear with the clutch engaged.

mikejuice · Apr 30, 2019

correct, the bike is under load (riding the bike). It has trouble getting past 8k even in first gear. Note- bike is in sport mode and RPM is set to high in setting

kuksul08 · Apr 30, 2019

You can't really jump the switches. You need it open for starting the bike, and you need it closed so it doesn't think the clutch is always pulled in.

Do you have stock gearing?

mikejuice · Apr 30, 2019

I'm running -3 rear sprocket and stock front. I would think even if were in 1st or 2nd gear that I would be able to hit 10k in rpms. But it just stops about 8k. The open clutch switch made a good difference however. Should I do some sort of hard reset since I ran 200+ miles with the clutch switch closed?

kuksul08 · Apr 30, 2019

Well the reason I ask about gearing is that my 2014 Hyper was weird. When I changed the gearing I couldn't rev past 8000 anymore, but only in 2nd gear. The other gears were fine...

Do you get flashing red lights when you hit 8k? Does it feel like a rev limiter?

mikejuice · Apr 30, 2019

No red lights, more so just running out of steam and won't go any higher. It's very odd, if I'm on a slight down hill I might get a little more.

kuksul08 · Apr 30, 2019

very strange. No errors listed in the dashboard when you go into settings?

gatdammit · May 1, 2019

My redline came down a little, around 10K. I have a 14T front. Runs great other than the hiccup @ 8K, then powers through to redline.

Think it's a wheel speed/ DTC miscompare? I would think big knobby tires or aftermarket wheel diameters would have the same effect.

mikejuice · May 1, 2019

I took a short video that I uploaded. I apologize up front for the bad quality

I rev out 1-3 gear in the short video. Its hard to see the cluster but doesn't go past 8k note ABS light is blinking because its turned off. I ran this gearing before with no issues for a few months. Also i took it on the freeway later not on video. When down shifting and WOT it feels like is bogs. https://youtu.be/DeTK2ZwdRbo

mikejuice · May 1, 2019

I may have found the culprit. Kinked fuel line going to the injector vs the main fuel line to the tank. https://imagizer.imageshack.com/v2/320xq90/r/921/PC9FBi.jpg

mikejuice · May 1, 2019

Finally fixed! Thanks guys for your help. Bike rips now

kuksul08 · May 1, 2019

What do you know! Someone here had the exact same problem.

mikejuice · May 1, 2019

I thought the only place it could get kinked was near the J bend over the exhaust but guess I was wrong. So happy to get it going after trying to figure out all winter.

gatdammit · May 1, 2019

Good to hear. If you don't develop a hiccup in 2nd, I may be swapping to +3 rear.

mikejuice · May 3, 2019

Bike is running great. Only issue I'm having now is coming off of high revs to stop/ idle, the bike dies. Needs some adjustment to whatever keeps the revs up at idle so it doesn't die out. As far as the gearing goes, with kuksul08 tune its excellent. Plus very hard in each gear to redline. WOT in 2nd with hardly any wheelie with all the electronics turned off. I'm able to cruse in fast lane 6th gear about 80 MPH at under 5k.

Hyper 821 won't rev over 7.5k

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