Rev limiter problems

2457 Views 11 Replies 4 Participants Last post by 7 Summits, Mar 4, 2015

PomGP

Discussion Starter · Feb 19, 2015

Hey guys.
I have a 2014 Hyperstrada with 9000 kilometres on the clock. A couple of weeks ago the battery died, the bike indicated CANLINE errors on teh dash and basically went beserk.

I replaced the battery, and now the rev limiter kicks in at 8000 rpm and stops the acceleration in it's tracks, the bike is also backfiring and popping badly on the overrun.

I have had the bike at the dealer for 2 weeks with no joy at all. They tell me that they are waiting for feedback from Bologna.

Anyone seen similar problems to this before? Any ideas? Please help

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Tuned

· #2 · Feb 19, 2015

Sure, it's probably something wrong with the charging circuit. My guess is, the battery died because it wasn't being charged. The fresh battery doesn't have enough juice to perfectly run the bike, so it's running in "limp home mode" which is why it makes noises and has a low max RPM. Just a guess, but it's one that fits the given facts.

Call the dealer and ask if they've checked that… should be an interesting response! LOL

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PomGP

Discussion Starter · #3 · Feb 20, 2015

Tuned said:
Sure, it's probably something wrong with the charging circuit. My guess is, the battery died because it wasn't being charged. The fresh battery doesn't have enough juice to perfectly run the bike, so it's running in "limp home mode" which is why it makes noises and has a low max RPM. Just a guess, but it's one that fits the given facts.

Call the dealer and ask if they've checked that… should be an interesting response! LOL

Off to see the dealer this afternoon, not holding up much hope as the senior techie keeps telling me there are no errors recorded and he needs advise from Italy:cross:

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PomGP

Discussion Starter · #4 · Feb 21, 2015

I pulled a few bits off the bike last night and discovered that the drive motor for the exhaust valve is not working

Perhaps I should jam the valve open and ride the bike to see what happens

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Reactions: 1

Tuned

· #5 · Feb 21, 2015

Huh… that would for sure cause popping and clicking if it were CLOSED for some reason. However, it may not do anything unless your on the bike riding.

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martinc

· #6 · Mar 3, 2015

My 1098 tri did that out of the crate (hit a BRICKWALL AT 8K RPMS)...dealer couldn't find error codes,wouldnt look at it after an inconclusive road test....that makes you confident isn't it.

It did that on and off since 2007...I love my dealer (he`s the only one for hundreds of miles around) its hhard to diagnose that...new charging circuit,new batt did nothing for it

new coils,new pump new ecu nope.

good luck.

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PomGP

Discussion Starter · #7 · Mar 3, 2015

I got to the bottom of the problem and solved it in my garage myself.
The neutral switch cable on the back of the motor was chafing inside it's housing and shorting out. This makes the ECU think the bike is in neutral all the time and cuts the rev limiter to 8000rpm. Once I put some heat shrink on the connector and nipped it up tight the problem vanished.

I strongly suggest that anyone with similar issues check this as the fitting is not good and the insulation on the bullet connector is just cheap rubber. According to my dealer there has been recalls on this issue before.

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7 Summits

· #8 · Mar 3, 2015

PomGP said:
I got to the bottom of the problem and solved it in my garage myself.

The neutral switch cable on the back of the motor was chafing inside it's housing and shorting out. This makes the ECU think the bike is in neutral all the time and cuts the rev limiter to 8000rpm. Once I put some heat shrink on the connector and nipped it up tight the problem vanished.

I strongly suggest that anyone with similar issues check this as the fitting is not good and the insulation on the bullet connector is just cheap rubber. According to my dealer there has been recalls on this issue before.

Do you have any pictures of said neutral cable?

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Tuned

· #9 · Mar 3, 2015

PomGP said:
This makes the ECU think the bike is in neutral all the time and cuts the rev limiter to 8000rpm.

I have absolutely no idea how that could happen. The bike should rev without a problem in neutral. Also, that little neutral switch, makes the N light on the dashboard glow. Even if it was intermittent, you'd see the light at some point flicker.

Still, very interesting fix and I don't doubt for a second it's fixed because these new bikes are more heavily ECU controlled and they will totally freak out if there is anything intermittent.

Good fix and thanks for sharing!

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7 Summits

· #10 · Mar 4, 2015

Anybody have a picture of the neutral cable or can circle it on a exploded drawing? I had this problem a couple times a year or so ago and would like to investigate further.

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PomGP

Discussion Starter · #11 · Mar 4, 2015

7 Summits said:
Anybody have a picture of the neutral cable or can circle it on a exploded drawing? I had this problem a couple times a year or so ago and would like to investigate further.

Pic below
The neutral switch is inside the grey grommet in the back of the motor